MXPA06005354A - Method and device for determining petrophysical parameters - Google Patents

Abstract

A method for determining one or more parameters of a rock sample, the method involving measuring the magnetic susceptibility of the sample, and determining a value of the parameter using that measured susceptibility. For example, the measured susceptibility can be used to determine the fractional content of one or two components of the sample. Preferably, pre-determined parameter information, such as permeability, is stored as a function of magnetic susceptibility (or a function thereof). Using this stored information, a parameter value for a sample under study can be determined, based on the measured magnetic susceptibility.

Description

METHOD AND SYSTEM TO DETERMINE PETROPHYSICAL PARAMETERS FIELD OF THE INVENTION The present invention relates to a method and a tool for determining one or more petrophysical parameters from a magnetic susceptibility measurement. In particular, the invention relates to a method and a tool for determining permeability from a magnetic susceptibility measurement.

BACKGROUND OF THE INVENTION Magnetic susceptibility measurements are not carried out routinely in the petroleum industry, either in central analysis laboratories or in the hole of the well in an online wire log or measurements while carrying out the measurements. drilling operations (MWD). Permeability measurements are usually carried directly on core samples. This direct measurement requires that the samples be erased and measured, which can take several days or weeks for all channel holes in only one well. Since the cutting and processing of the core is very expensive, in general, permeability measurements are only made a fraction of the boreholes. While some techniques, such as nuclear magnetic resonance (NMR), have been used to predict permeability, they are relatively complicated and expensive.

BRIEF DESCRIPTION OF THE INVENTION In accordance with one aspect of the present invention, a method for determining one or more parameters of a rock sample is provided, the method involves measuring the magnetic susceptibility of the sample and determining a value of the parameter with the use of the susceptibility measured. With the use of measured magnetic susceptibility, the actual value of several parameters, such as permeability, can be obtained. This can be done easily and effectively by comparing the measured susceptibility (or a function thereof) with the parameter values that are stored as a function of the magnetic susceptibility (or a function thereof). For this purpose, the method in which the invention is incorporated also involves storing the parameter information as a function of the magnetic susceptibility (or a function thereof) and using it to determine a parameter value for a sample. Preferably, this is done for a range of different materials. The parameter may be one or more of the permeability (k), cation exchange capacity per pore volume per unit (Qv), and flow zone indicator (FZI). The parameter can also be a wire line gamma-ray response. The invention resides, at least in part, in the previously unknown embodiment that these parameters can be correlated with magnetic susceptibility (or a function thereof). The method in which the invention is incorporated is particularly useful for calculating permeability. Permeability is the ability of the fluid to flow through the rock, and is a key parameter to determine the best way to introduce oil, as well as to determine the place to drill in an oil or gas field. For the purpose of providing correlation data, permeability measurements can be obtained with the use of various sizes of rock samples, but preferably, complete samples of central rock, central rock samples in slabs or samples of central borehole. routine. Preferably, the method also involves characterizing the sample to identify at least two components of the sample or using a predetermined characterization of the sample, using the measured magnetic susceptibility and the susceptibilities for two components identified to determine the fraction of the total sample contributed. by at least one of the components and then use the determined fraction to determine the value of the parameter. In this case, the stored correlation information will be a function of the fraction content. When determining the fraction of the component in a total sample can be carried out with the use of the equation FB = (% A-% T) / (% A-? B), where A and B are the two components, FB is the fraction of component B and? a,? B and? t are the magnetic susceptibilities of A, B and the total sample, respectively. The method can be applied in magnetic susceptibility measurements made in the laboratory on core samples (core holes, core in slabs, complete core or uniform drilling cuts). The method can also be applied in magnetic susceptibility data in the well, which allows on-site calculations of mineral contents and petrophysical parameters. This method can also be applied in the current data activity in the hole of the well (such as wire line gamma rays), which allows on-site calculations of mineral contents and petrophysical parameters. By correlating the magnetic susceptibility and / or fraction content with several parameters and also with the wire line gamma-ray response, the method allows the mineral content and the petrophysical parameter prediction information to be derived from the tool data. gamma rays of wire line. Therefore, by comparing the measured magnetic susceptibility measurements of some representative core samples with the wireline gamma-ray log data from the same oil or gas well, mineral content and petrophysical parameters can be predicted through of intervals without core in the same well, and in other wells in the same field, from the results of gamma rays of wire line. In accordance with another aspect of the present invention, a computer program, preferably a data carrier or a computer-readable medium, is provided, the program has a code or instructions to receive or access the measured magnetic susceptibility of the sample and determine the value of the parameter with the use of the measured susceptibility. Parameters may include permeability (k), cation exchange capacity per pore volume per unit (Qv), and flow zone indicator (FZ1). The code or instructions can be operated to access the parameter information that is stored as a function of the magnetic susceptibility (or a function thereof) and uses these to determine the parameter value for a sample. Preferably, this is done for a variety of different materials. Preferably, the computer program has code or instructions to receive the identity of at least two components of the sample, to identify the magnetic susceptibility of the two identified components and to use the measured magnetic susceptibility and the susceptibilities of two identified components to determine the fraction of a total sample contributed by at least one of the components, where the code or instructions to determine the value of the parameter operates to use the determined fraction to determine the value of the parameter. The code or instructions to determine the fraction of a component in a total sample can operate to use the equation: FB = (XA-X?) I (XA-XB), where A and B are the two components, FB is the fraction of component B and? a,? B and% t are the magnetic susceptibilities of A, B and the total sample, respectively. The code or instructions can operate to compare the determined fraction content of one of the components with predetermined data, the predetermined data is a measurement of one or more parameters as a function of the fraction content of the component, which determines a value for that parameter of the component. The parameters can be one or more of permeability, cation exchange capacity per pore volume per unit (Qv) and the flow zone indicator (FZ1). In accordance with another aspect of the present invention, a system for determining one or more parameters of a rock sample is provided., the system operates to receive or have access to a measured value of the magnetic susceptibility of a sample and determine the value of the parameter with the use of the measured susceptibility. The parameters may include permeability (k), cation exchange capacity per pore volume per unit (Qv) and flow zone indicator (FZ1). The system can operate to access parameter information that is stored as a function of magnetic susceptibility (or a function thereof) and uses it to determine a parameter value for that sample. Preferably, this is done for a variety of different materials. Preferably, the system operates to receive the identity of at least two components of the sample, to identify the magnetic susceptibility of the two identified components, to use the measured magnetic susceptibility and the susceptibilities of two identified components to determine the fraction of the sample. total contributed by at least one of the components and then determine the value of the parameter with the use of the determined fraction. The system can operate to determine the fraction of the total sample with the use of the equation FB = (XA-XT) / (XA-XB), where A and B are the two components, FB is the fraction of component B and ? a,? B and? t are the magnetic susceptibilities of A, B and the total sample, respectively. The system may include a means for comparing the fraction content of one of the components with predetermined data, the predetermined data is a measurement of one or more parameters as a function of the fraction content of the component, in order to determine a value for that parameter for the sample component. The parameters may be one or more permeability, cation exchange capacity per unit pore volume (Qv) and flow zone indicator (FZI). Means can be provided for measuring the magnetic susceptibility of the sample and providing a measured value to the medium to be determined. The means to measure the magnetic susceptibility of the sample can be a laboratory tool or a hole hole tool. The system may include a memory for storing the magnetic susceptibilities of the sample and the two components. Alternatively or additionally, the system may include a user input to enter data. Alternatively or additionally, the system may include a display for the user to present the determined information. In accordance with another aspect of the present invention, a tool is provided to determine one or more parameters of a rock sample, the tool operates to measure the magnetic susceptibility of a sample, and to determine a value of the parameter with the use of that Measured susceptibility. The parameters may include the permeability (k), the cation exchange capacity per pore volume per unit (Qv) and the flow zone indicator (FZI) as a function of the fraction content of a known component. The tool operates to access parameter information that is stored as a function of magnetic susceptibility (or a function of it) and use it to determine the value of the parameter for a sample. Preferably, this is carried out for a variety of different materials. According to another aspect of the invention, there is provided a method for determining a parameter value that involves measuring the magnetic susceptibility and measuring or determining a plurality of parameters, storing the data correlating each measured susceptibility or a function thereof for each parameter, measure one of the parameters and infer values for one or more of the other parameters with the use of the correlated data and the measured parameter. The plurality of parameters may include permeability, cation exchange capacity per pore volume per unit (Qv), and flow zone indicator (FZI) and the gamma ray response of wire line. Measurement of the parameter may involve measuring the gamma-ray response of the wireline and inferring values for one or more of the parameters with the use of the correlated data.

BRIEF DESCRIPTION OF THE DRAWINGS Several aspects of the invention will now be described by way of example and with reference to the accompanying drawings, in which: Figure 1 is a table showing the magnetic susceptibility for various minerals. Figure 2 is a schematic of the permeability of a horizontal bore compared with the content of magnetically derived lime. Figure 3 is a schematic of the magnetic susceptibility against the cation exchange capacity per pore volume per unit (Qv). Figure 4 is a diagram of a magnetically derived Hita content against the flow zone indicator (FZI). Figure 5 is a block diagram of a tool for a well hole; and Figure 6 is a wire line gamma ray scheme against the content of magnetically derived Hita.

DETAILED DESCRIPTION OF THE INVENTION The method in which the invention is incorporated involves measuring the magnetic susceptibility of a sample and determining a petrophysical parameter value, such as permeability, using the measured susceptibility. This can be done by correlating the unprocessed data of the measured susceptibility with parameter data that are stored as a function of the susceptibility or by processing the magnetic susceptibility data and then comparing them with the parameter data that are stored as a function of the processed • data. For example, the processed data may be the fraction of a total sample contributed by at least one of the components. This will be described in more detail below. - In any case, the methodology can be implemented in software or hardware or a combination of these. The unprocessed magnetic susceptibility, measured from a rock core sample, represents the combined signal of all negative (diamagnetic) susceptibility and the positive (for example, paramagnetic or ferrimagnetic) susceptibility of mineral components in the rock. This means that rock samples may have a positive or negative net magnetic susceptibility, which depends on their composition. The unprocessed magnetic susceptibility can be measured in core holes, and in addition to drilling cuts, the complete core or the core in slabs, and thus there is no need to cut core holes. This is particularly useful for an unconsolidated core, where it is difficult or impossible to cut the cohesive holes. Any technique can be used to mediate magnetic susceptibility. To use the magnetic susceptibility information to determine the fraction composition of a sample, it is first assumed that the sample consists of a simple mixture of two components comprising a mineral A with intrinsic negative magnetic (diamagnetic) susceptibility together with a mineral B with magnetic intrinsic positive susceptibility (paramagnetic or ferrimagnetic or ferromagnetic or anti-ferromagnetic), both susceptibilities are well known. In practice, the most appropriate mineral option A and B for a particular section of an oil or gas well can be characterized by initially characterizing drill cuts, and identifying the matrix minerology with the use of methods known as cross-schemes different from those record results of wire line in known templates. For a sample of two components, a total magnetic susceptibility signal per unit mass (or volume) is the sum of two components: Or alternatively, where FA is the fraction of the mineral A, FB is the fraction of the mineral B, and? A and XB are the known magnetic susceptibilities per unit mass (or volume) of minerals A and B. Since? t is the magnetic susceptibility measurement of the rock sample and? A and? B are known then the fraction of B is determined by: FB = (XA-% T) / (XA-XB) (3) It is a simple matter to obtain the fraction of ore A as follows: FA ^ I-FB (4) By multiplying these fractions by 100%, you can obtain the percentages of minerals A and B in the rock sample. When converting the unprocessed magnetic susceptibility signal into a mineral percentage (that is, processing it in a positive number) has certain advantages. First, the intervals of the orifice samples that contain anomalous minerals can be easily signaled. This can be done by looking for magnetic susceptibility as a function of the depth within the hole sample and identifying any ridge or depression. A value greater than 100% for one or the component (in particular, component B) clearly indicates that other minerals are present. Second, comparisons of this magnetically derived mineral content can be carried out with predetermined data in logarithmic schemes, the predetermined data being a measurement of one or more petrophysical parameters as a function of the fraction content. In this way, a value can be determined for that parameter of the sample. Examples of parameters that can be determined in this way include; permeability, cation exchange capacity per pore volume per unit (Qv), and the flow zone indicator (FZI). This will be described in detail later, with reference to specific samples. The main components of most sedimentary rocks, usually quartz in the case of sand rocks or calcite in the case of carbonates, are diamagnetic and have low values of negative magnetic susceptibility. On the contrary, the important permeability that controls the clay minerals, for example, illite, are paramagnetic with highly positive magnetic susceptibilities. Therefore, in many cases, the determination of the permeability of, for example, illite allows determining the general permeability of the sample. The susceptibilities for several common materials are shown in Figure 1. These data are derived from Hunt, C.P. Moskowitz, B.M. and Banerjee, S.K. 1995, "Magnetic properties of rocks and minerals" in Ahrens, T.J. ed., Rock Physics and Phase Relations: a Handbook of Physical Constants, American Geophysical Union reference shelf, 3 p. 189-204. In many sedimentary sequences, for example, a variety of deposition samples from the North Sea, quartz and paramagnetic clays (usually illite and chlorite) are the dominant carriers of the magnetic susceptibility signal in the absence of a significant fraction. of other paramagnetic or ferrimagnetic minerals. Assuming that the rock in these sequences is a simple mixture of quartz (the diamagnetic component) and illite (the paramagnetic component) the total magnetic susceptibility signal of the rock sample per unit mass? T is the sum of two components: ? -? l (Fú (? i).}. + { (1-FIHXQ).}. (5) Where F? is the fraction of illite, (1-F,) is the fraction of quartz, and X? And XQ are known magnetic susceptibilities per unit mass (or volume) of illite and quartz. Since it can not be measured (quickly for example, with the use of a bridge of magnetic susceptibility) and ?? ? Q are known, then the illite fraction F | is determined by: It is a simple matter to obtain the quartz fraction (1-F,). In this way, an upper limit of the amount of illite (F |) can be obtained, since it is assumed in the analysis that the positive component of the total magnetic susceptibility signal is entirely due to the illite. With the use of this information, the petrophysical parameters can be determined by reference to the stored predetermined data, the predetermined data is a me of one or more parameters as a function of the illite fraction content. In Figures 2 to 4, several stored logarithmic cross schemes are shown. These are predetermined and used to correlate the measured magnetic susceptibility, or a function of the same as the fraction mineral content, with specific parameter values. For example, Figures 2 and 4 show that the magnetically derived illite content exhibits strong experimental correlations with fluid permeability (k) and the flow zone indicator (FZI). In this way, when determining the percentage content of ¡Hita, these parameters can be inferred or predicted quickly. For some parameters, it is not necessary to determine the content of the material's direction, but the measured susceptibility data can be used. For example, as shown in Figure 3, the capacity of cation exchange per pore volume per unit (Qv) determines a strong correlation with the magnetic susceptibility measured without processing. Therefore, a ccl of this parameter can be inferred only from a measurement of magnetic susceptibility. In many cases, a two-component model mixture is a good approximation, as in the previous example for typical rock samples from the North Sea deposit. However, many rock samples consist of three or more components. In these cases, when it is possible to calculate the content of other components for some X-ray diffraction analysis (XRD) or thin section analysis, then the magnetic method described here can be used to easily calculate the one or two components of interest in other samples / larger intervals, where other analyzes would be expensive and time consuming. When material B of the component of interest is present is a paramagnetic mineral (such as a permeability control clay) and other ferrimagnetic (or ferromagnetic or anti-ferrimagnetic) minerals, then FB will be overcalculated unless these other components are taken in account. However, the presence of these other (remanent) components can be easily identified by observing whether the sample can acquire a laboratory-induced remanence. This is easily done by subjecting the rock sample to a pulsed magnetic field. Any ferrimagnetic (or ferromagnetic or anti-ferrimagnetic) mineral present will acquire an isothermal remanent magnetization (MRI) under these conditions, which can be measured with the use of known magnetometer technology. The only exception for this is the superparamagnetic particles, which will not acquire a remanence. In cases where the rock consists of two or more diamagnetic minerals (for example, quartz and orthoclase feldspar) plus a paramagnetic mineral (for example, illite) then the magnetic calculations of the content of the paramagnetic mineral (FB) will not be affected. important by the assumption of equations (1) and (2), that the total diamagnetic signal in the rock is entirely due to an assumed diamagnetic mineral since many diamagnetic minerals, for example, calcite and orthoclase feldspar (see Figure 1) ) have magnetic susceptibility values very similar to that of quartz. Figure 5 shows a well hole tool. It has a sensor 1 in the form of a coil or coils (preferably a double coil system). This is placed in a cylindrical, non-magnetic, strong housing. This housing has an appropriate diameter for typical wellbore diameters as used in the oil and gas industry (about 10 cm, but may be smaller or larger depending on the size of the well bore). The length of the cylinder is approximately 1 m. On the sensor housing there is a cylindrical enclosure containing the electronics 3 that process the signal from the sensor coil system. This enclosure is also approximately 1 m in length, but has a diameter smaller than that of the sensor housing. Surrounding the electronics enclosure is an appropriate outside cylinder 4 to protect the electronics enclosure at reservoir temperatures and pressures. On the electronics enclosure is a wire outlet housed in a cable 5 suitable for the wire line registration operations. With the use of the magnetic sensor 1, it is possible to obtain a direct measurement of the susceptibility of the material near the tool and outside the housing 2. This data output is transmitted, through wires in the cable, to a recording installation 6 on the surface. Typically, the surface equipment includes a memory (not shown) for storing the magnetic susceptibilities of the sample and two components and the data / parameter correlation schemes. The system includes a user input to enter data and the user's display to present the determined information. With the use of the tool of Figure 5, on-site measurements of the wellbore of magnetic susceptibility can be made as part of the wireline log chain. The tool will operate at gas or oil tank temperatures (of at least 120 °) and pressures of around 6000-10000 psi (approximately 40 to 70 MPa). The tool can also be incorporated into another form of well hole measurements, these measurements are made while bore (MWD).

Well hole measurements of unprocessed magnetic susceptibility can potentially indicate the major lithological zones in a well hole with high resolution. This is because the net negative magnetic susceptibility signal indicates that the rock has predominantly diamagnetic minerals (eg, quartz), while a net magnetic positive susceptibility signal indicates that the rock has significant amounts of minerals with positive susceptibility. A change from positive to negative susceptibility indicates a change of material and, therefore, a new lithological zone. The materials can be paramagnetic (ie, illite clay), ferrimagnetic (eg, magnetite) or anti-ferrimagnetic (eg, hematite). These susceptibility zones can also be correlated with a well orifice of wide permeability zones. In general, areas of negative magnetic susceptibility correspond to areas of high permeability (except where there are diamagnetic cements of low permeability) and areas of positive magnetic susceptibility tend to correspond to areas of low permeability. With the use of magnetic susceptibility measurements, the cuts between the different lithologies can be quantitatively more accurate than the gamma ray tool, due to the higher potential resolution of the magnetic tool. The methodology in which the invention can be incorporated provides a mechanism to determine the fraction content of the component samples (one component has a negative magnetic susceptibility and the other component has a positive susceptibility), only from the measurement of magnetic susceptibility. Also, it can be used to provide information of any parameter that has a direct correlation with magnetic susceptibility, for example, mineral contents and petrophysical parameters as listed above. In addition, it has been found that the fraction content data derived from the measured magnetic susceptibility can be correlated with the wire line gamma ray data. For example, the magnetically derived illite content of the core material in some oil wells of the North Sea has a strong experimental correlation with the results of wireline gamma rays, as illustrated in Figure 6. Therefore, the Measuring the magnetic susceptibility and the wire line gamma-ray response for a variety of samples having different fraction contents of a material, eg, illite, generates fraction content information and stores it as a function of the data from Gamma ray wire line, illite fraction content can be quantified from gamma ray results in other sections of the same well or adjacent wells, where there is no core. Since the content of illite, in that case, correlates with gamma ray results, it is very likely to correlate them with permeability, cation exchange capacity per pore volume per unit, and the flow zone indicator, as it has been discovered experimentally in other cases. In this way, all these parameters can be predicted again from the wireline gamma-ray data. The present invention offers many advantages. For example, compared to the known laboratory gamma-ray method in the laboratory, the method as applied in the laboratory allows for greater resolution of measurements. Compared with nuclear magnetic resonance (NMR) measurements in the laboratory, the method presented here is essentially faster, does not require sample preparation and correlates better with the actual permeability of the rock in samples where this comparison was made. This means that the measurement and processing of hundreds of conventional core holes (equivalent to the core holes from one or two oil or gas wells) can be done in one day, which allows calculations of permeability on the same day. Therefore, key exploration and drilling decisions can be made at an earlier stage than is currently possible. In addition, measurements can be made on drilling cuts, which are cheap and a fast source of core material. Another useful feature is that the invention can quantify the effect of cleaning the sample, for example, the effect of removing the clays. This is because measurements can be made and data can be interpreted before and after cleaning for comparison purposes. Also, the method is non-destructive and environmentally compatible and therefore has beneficial effects with respect to lift. In addition, they can be applied in magnetic susceptibility data from the hole of the well, which allow the magnetically derived mineral contents and the petrophysical parameters (permeability, k, capacity of cation exchange per pore volume per unit, Qv, and the indicator of FZI flow zone) can be calculated for on-site measurements at reservoir temperatures and pressures. Those skilled in the art will appreciate that the arrangements discussed are possible without departing from the invention. For example, although the invention has been described primarily with reference to an oil or gas well, it can be seen that it can be applied to any sample from a well orifice. Also, although the invention is described primarily with reference to the sample including illite, it can be applied to many types of rock, such as sandy rocks comprising a dominant diamagnetic mineral (eg, quartz) and paramagnetic mineral (eg, chlorite). ) or carbonates comprising a diamagnetic mineral (e.g., calcite) and a ferrimagnetic mineral (e.g., magnetite). Other components can be correlated in a different way with petrophysical parameters, but the correlation data for other component minerals can potentially be used to predict these parameters. Accordingly, the above description of a specific embodiment is provided as an example and has no limiting purposes. It will be apparent to those skilled in the art that minor modifications can be made without departing from the described operation.

Claims (29)

1. CLAIMS 1. A method to determine one or more parameters of a rock sample, the method is characterized because it involves measuring the magnetic susceptibility of a sample and determining a value of the parameter with the use of magnetic susceptibility. The method according to claim 1, characterized in that it involves storing predetermined parameter information as a magnetic susceptibility function (or a function thereof) and using it to determine a parameter value for a sample based on magnetic susceptibility measure. The method according to one of the preceding claims, characterized in that the parameters include fraction mineral content, permeability (k), cation exchange capacity per pore volume per unit (Qv) and flow zone indicator (FZI) ). 4. The method according to one of the preceding claims, characterized in that it involves characterizing the sample to identify at least two components thereof or using the predetermined characterization of the sample, with the use of the measured magnetic susceptibility and susceptibilities for two. identified components to determine the fraction of the total sample contributed by at least one of the components, and then, use the determined fraction to determine the value of the parameter. 5. The method according to claim 4, characterized in that determining the fraction of the component in the total sample involves the equation: FB = (XA-XT) / (XA-XB), where A and B are the two components, FB is the fraction of component B and Xa, XB and XT are the magnetic susceptibilities of A, B and the total sample, respectively. 6. The method of compliance with. line of the preceding claims, characterized in that the magnetic susceptibility is measured in a laboratory or in a well hole. The method according to claim 6, characterized in that the magnetic susceptibility is measured in the hole of the well, while bore, whereby measurements are provided while bore (MWD). 8. A computer program, preferably in a data carrier or a computer readable medium, the program has a code or instructions to receive or access the measured magnetic susceptibility of the sample and determine a value of the parameter with the use of measured susceptibility. 9. The computer program according to claim 8, characterized in that the parameters include the permeability (k), the cation exchange capacity per pore volume per unit (Qv) and a flow zone indicator (FZI) as a function of the fraction content of a known component. 10. The computer program according to claim 8 or claim 9, characterized in that the code or instructions operate to access the parameter information that is stored as a function of the magnetic susceptibility (or a function thereof) and use this to determine a parameter value for a sample. The computer program according to any of claims 8 to 10, characterized in that it includes a code or instructions for using the measured magnetic susceptibility and the magnetic susceptibilities of two components of the sample to determine the fraction of the total sample contributed by at least one of the components, wherein the code or instructions to determine the value of the parameter operates to use the determined fraction to determine the value of the parameter. The computer program according to claim 11, characterized in that the code or instructions for determining the fraction of a component in the total sample can be operated to use the equation: FB = (XA-XT) / (XA-XB) , where A and B are the two components, FB is the fraction of component B and? a,? B and XT are the magnetic susceptibilities of A, B and the total sample, respectively. The computer program according to claim 11 or claim 12, characterized in that the code or instructions operate to compare the determined fraction content of one of the components with predetermined data, the predetermined data is a measurement of one or more parameters as a function of the fraction content of the component, and so on to determine a value for that parameter for the component. The computer program according to any of claims 8 to 13, characterized in that the parameters of any one or more of permeability, cation exchange capacity per pore volume per unit (Qv) and the zone indicator of flow (FZI). 15. A system for determining one or more parameters of a rock sample, the system is characterized in that it operates to receive or have access to a measured value of magnetic susceptibility of a sample, and to determine the value of the parameter with the use of susceptibility magnetic The system according to claim 15, characterized in that the parameters include any one or more of permeability (k), cation exchange capacity per pore volume per unit (Qv) and the flow zone indicator (FZI) ). The system according to claim 15 or claim 16, characterized in that it operates to access the parameter information that is stored as a function of the magnetic susceptibility (or a function thereof) and use it to determine a value of a parameter for a sample. 18. The system according to any of claims 15 to 17, characterized in that it operates for the measured magnetic susceptibility and the magnetic susceptibilities of two components of the sample to determine the fraction of the total sample contributed by at least one of the components, and Then determine the value of the parameter with the use of the determined fraction. 19. The system according to claim 18, characterized in that it operates to determine the fraction of the total sample with the use of the equation: FB = (XA-XT) / (XA-XB), where A and B are the two components, FB is the fraction of component B and? a, XB and XT are the magnetic susceptibilities of A, B and the total sample, respectively. The system according to claim 18 or claim 19, characterized in that the system operates to compare the fraction content of one of the components with predetermined data, the predetermined data is a measurement of one or more parameters as a function of the fraction content of the component, and so on to determine the value for that parameter for that component of the sample. 21. The system according to any of claims 15 to 20, characterized in that it includes a means for measuring the magnetic susceptibility of the sample and providing the measured value to the medium to be determined. 22. The system in accordance with the claim 21. characterized in that the means for measuring the magnetic susceptibility of the sample is a well hole or hole orifice tool. 23. The system according to any of claims 15 to 22, characterized in that it includes a memory for storing the magnetic susceptibilities of the sample, and the two components. 24. The compliance system with any of claims 15 to 23, characterized in that it includes a user input to enter data. 25. The system according to any of claims 15 to 24, characterized in that it includes a display of the user to display the determined information. 26. A method for determining a parameter value that involves measuring the magnetic susceptibility and measuring or determining a plurality of parameters, storing data that correlates with the magnetic susceptibility or a function thereof for each parameter, measuring one of the parameters and inferring values for one or more other parameters with the use of the correlated data and the measured parameter. 27. The method according to claim 26, characterized in that the plurality of parameters include permeability (k), cation exchange capacity per pore volume per unit (Qv), flow area indicator (FZl) and the response of gamma rays of wire line. 28. The method according to claim 27, characterized in that one parameter involves measuring the gamma-ray response of the wire line and inferring values for one or more other parameters using the correlated data. 29. A well-hole tool for measuring the magnetic susceptibility of a magnetic sensor in the form of a coil or coils in a non-magnetic housing, the sensor operates to measure the magnetic susceptibility of a material outside the non-magnetic housing.