CN110231661B - Rock specimen and corresponding method for field exploration measurement of induced polarization parameters - Google Patents
Rock specimen and corresponding method for field exploration measurement of induced polarization parameters Download PDFInfo
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Abstract
The invention discloses a method for corresponding rock specimen and field exploration measurement induced polarization parameters, which comprises the following steps: determining a research area, and scanning the research area by an induced polarization method for measurement; calculating the types and the occupation ratios of various rock minerals according to a geological plan of a research area; carrying out standard processing on the collected specimen; testing the processed samples by adopting a uniform sample testing instrument, and before testing, performing vacuum pumping and water saturation treatment on all collected rock samples by using a vacuum saturation device; fitting the data to obtain an induced polarization method scanning surface fitting curve; the data is compared to the values in the curve to determine the lower anomaly limit. The invention compares the detection data of different scales, evaluates the excitation parameters by utilizing the ideas of one-to-one correspondence and sample sampling, and finely describes the extreme value of the abnormal lower limit for the first time by utilizing the statistical calculation principle.
Description
Technical Field
The invention belongs to the field of exploration geophysics, and relates to a rock specimen and a corresponding method for field exploration measurement of induced polarization parameters.
Background
In the field of geophysical exploration methods, parameters acquired by an induced polarization method comprise polarizability eta and resistivity rho, and the cooperation of the polarizability eta and the resistivity rho is an effective means for searching sulfide mineral deposits or underground water. But the polarizability and the resistivity of the geologic body are not only closely related to the environment, components, water content, density and the like of the geologic body, but also the stratum (lithology) of each geological working area is not consistent enough in field large-scale detection and indoor small-scale sample test; the field actual measurement data and the indoor sample test data of different lithology can not be completely corresponding one to one.
The two latest standards of time domain induced polarization method technical regulation (DZ0070-2016) and national geological survey bureau rock and ore physical property survey technical regulation (DD2006-03) of the ministry of homeland resources do not provide the lower limit of abnormality of related physical property samples and the corresponding method for sample testing. The related induced polarization method for finding the mine literature only gives a relatively wide description of low resistance and high polarization (such as Li Bo, Liu Han Jun, Zhou Jie, and the like. lead-zinc mineralizing and comprehensive analysis and mineral finding prospect [ J ] geophysical prospecting and chemical detecting, 2019, 43 (1): 36-45) in Hunan province, and the obvious sample test value polarization rate in the text is far greater than a field exploration measured value, which is not explained.
Disclosure of Invention
In order to solve the technical problems in the background art, the invention provides a corresponding method for measuring the excitation parameters of the rock specimen and the field exploration, which can determine the abnormal lower limit of the induced polarization field measurement parameters and can be widely applied to geological work such as mineral exploration, hydrological investigation and the like.
In order to achieve the purpose, the invention adopts the following technical scheme:
a rock specimen and field exploration measuring excitation parameter corresponding method comprises the following steps:
1) determining a research area, and scanning the research area by an induced polarization method for measurement;
2) calculating the types and the proportions of various rock minerals according to a geological plan of a research area, and collecting samples according to not less than 30 rock minerals;
3) carrying out standard processing on the collected specimen;
4) testing the sample subjected to the standard processing in the step 3) by adopting a unified sample testing instrument, and before testing, performing vacuum pumping water saturation treatment on all collected rock samples by using a vacuum saturation device;
5) processing the data obtained in the step 2) and the step 4), and drawing a frequency histogram, wherein the frequency histogram is subjected to GaussAmp function fitting on the frequency histogram by taking the polarization rate/resistivity grouping value as an abscissa and the frequency as an ordinate to obtain a sample fitting curve; the specific fitting mode of the GaussAmp function fitting is as follows:
wherein:
a is greater than 0, w is greater than 0, y0 is 0, xc is the midpoint of the value range, a is the length of the peak, w is FWHM/sqrt (ln4), and FWHM is the distance between two corresponding x of a/2;
6) repeating the step 5), fitting the data obtained in the step 1) to obtain an induced polarization method scanning surface fitting curve;
7) comparing the sample fitting curve obtained in the step 5) with the induced polarization method scanning surface fitting curve obtained in the step 6), extracting the maximum value of the sample fitting curve and the maximum value of the induced polarization method scanning surface fitting curve for comparison, and determining the lower limit of the abnormity.
Preferably, the specific implementation manner of step 1) adopted by the invention is to scan the research area by the induced polarization method to measure with reference to technical specification of time domain induced polarization method (DZ/T0070-93).
Preferably, step 1) adopted by the invention is to measure the scanning plane of the induced polarization method by laying 100 meters of line spacing and 20 meters of point spacing perpendicular to the main structure of the research area according to the technical specification of time domain induced polarization method (DZ/T0070-93).
Preferably, the specific implementation manner of step 3) adopted by the invention is as follows: and (3) uniformly processing the samples acquired in the step 2) into a standard cuboid by referring to technical rules of investigation on physical properties of rocks (ores) and rocks (DD2006-03), wherein the standard cuboid is 28-54 mm long, 27-40 mm wide and 26-36 mm high.
Preferably, the specific implementation manner of performing the test by using the unified sample testing instrument in the step 4) adopted by the present invention is as follows: the parameters of the instrument are selected to emit constant voltage 12V, the stacking times are 10 times, the signal time sequence is 2 seconds, and the experimental analysis error is less than 5%.
Preferably, the rock specimen and the corresponding method for measuring the excitation parameters by field exploration adopted by the invention further comprise the following steps after the step 7):
8) subdividing the maximum value and the minimum value of the sample fitting curve obtained in the step 5) and the maximum value and the minimum value of the induced polarization method scanning surface fitting curve obtained in the step 6) according to equal intervals, comparing and corresponding ranges corresponding to different lithologic polarizabilities or resistivities, and determining the extension range information of each stratum rock.
The invention has the advantages that:
the invention provides a corresponding method for measuring induced polarization parameters of a rock specimen and field exploration, which comprises the following steps of 1) determining a research area, and scanning the research area by an induced polarization method for measurement; 2) calculating the types and the proportions of various rock minerals according to a geological plan of a research area, and collecting samples according to not less than 30 rock minerals; 3) carrying out standard processing on the collected specimen; 4) testing the sample subjected to the standard processing in the step 3) by adopting a unified sample testing instrument, and before testing, performing vacuum pumping water saturation treatment on all collected rock samples by using a vacuum saturation device; 5) processing the data obtained in the step 2) and the step 4), and drawing a frequency histogram, wherein the frequency histogram is subjected to GaussAmp function fitting on the frequency histogram by taking the polarization rate/resistivity grouping value as an abscissa and the frequency as an ordinate to obtain a sample fitting curve; 6) repeating the step 5), fitting the data obtained in the step 1) to obtain an induced polarization method scanning surface fitting curve; 7) comparing the sample fitting curve obtained in the step 5) with the induced polarization method scanning surface fitting curve obtained in the step 6), extracting the maximum value of the sample fitting curve and the maximum value of the induced polarization method scanning surface fitting curve for comparison, and determining the lower limit of the abnormity. The invention compares the detection data of different scales, evaluates the excitation parameters by utilizing the ideas of one-to-one correspondence and sample sampling, promotes the fine explanation of the excitation data of field exploration to one step, and finely describes the extreme value of the lower limit of the abnormality for the first time by utilizing the statistical calculation principle according to the GaussAmp function fitting data. And fitting the field exploration data and the sample measurement result on the whole research area by using a GaussAmp function, and comparing the two data sets to determine a peak value, an upper limit value of a background field and a lower limit value of an abnormal value. The peak value is considered as the minimum boundary of the background field and also as the abnormal lower limit of the sulfide deposit, and the abnormal range defined by the value is the induced area.
Drawings
FIG. 1 is a theoretical schematic diagram of a rock specimen and a corresponding method for measuring an excitation parameter in field exploration, provided by the invention;
FIG. 2 is a schematic flow chart of a rock specimen and a corresponding method for measuring an excitation parameter in field exploration;
FIG. 3 is a diagram showing the meaning of each parameter in formula (1);
FIG. 4 is a schematic view of a spot for collecting a specimen;
FIG. 5 is an empirical curve for determining a statistical array;
FIG. 6 is a frequency histogram of the sample test and the whole-area scan-plane polarizability based on the method provided by the present invention.
Detailed Description
The theoretical basis of the invention is as follows: referring to fig. 1, assuming that the induced polarization parameters are evaluated for a certain study area, 1: 10000 scanning work obtains the scanning whole area data space and the sample testing whole area space of all rock minerals in the sample testing research area, which requires that the two spaces are in one-to-one correspondence, respectively carries out sample statistical calculation on the two data, and utilizes the Gauss curves of the two data to map the information such as the abnormal lower limit of the field scanning whole area data from the sample data.
Referring to fig. 2, the invention provides a method for measuring induced polarization parameters of a rock specimen and field exploration, which needs the following steps:
1) for a certain research area, the linear distance of 100 meters and the point distance of 20 meters are arranged perpendicular to the main structure of the measurement area to carry out scanning measurement by an induced polarization method, a device is generally adopted to be a middle gradient method or a symmetric quadrupole method, and the technical specification of the time domain induced polarization method (DZ/T0070-93) is referred to for field data collection specifications.
2) The types and the proportions of various rock minerals are calculated according to a geological plan of a research area, at least 30 rock minerals are collected, and the originality, the randomness, the uniformity and the completeness of the rock minerals are ensured during collection.
3) And carrying out standard processing on the collected specimen. Wherein, rock (ore) samples in a research area are selected and uniformly processed into standard cuboids (specification: length is 28-54 mm, width is 27-40 mm, and height is 26-36 mm), and the specific processing process refers to rock (ore) physical property investigation technical specification (DD 2006-03).
4) And testing all samples by using a unified sample testing instrument, wherein the parameters of the instrument are selected to emit constant voltage of 12V, the stacking times are 10 times, the signal time sequence is 2 seconds, and the experimental analysis error is less than 5%. Before testing, all rock samples are subjected to vacuumizing water saturation treatment by using a vacuum saturation device so as to simulate the occurrence environment of underground rocks (ores) and improve the testing accuracy, and the specific experimental process refers to technical specification of time domain induced polarization method (DZ/T0070-93).
5) And (4) processing the data obtained in the step (2) and the step (4) and drawing a frequency histogram. And drawing a frequency histogram by taking the polarization rate/resistivity grouping value as an abscissa and the frequency as an ordinate, and then performing GaussAmp function fitting on the histogram, wherein the specific formula is as follows:
in the above formula, the parameters have the following meanings in FIG. 3:
A>0，w>0，y0＝0，xcto take the midpoint of the range, a is the length of the peak, FWHM is the distance between two x corresponding to a/2, and w is FWHM/sqrt (ln 4).
6) The data obtained in step 1 were processed according to the method of step 5 using the same fitting method.
7) And (4) comparing and analyzing results obtained in the step 5 and the step 6, extracting the maximum values of the two curves, and comparing to determine the lower limit of the abnormality.
8) For fine evaluation, the maximum value and the minimum value of the two curves are subdivided according to equal intervals, the ranges corresponding to different lithologic polarizabilities (or resistivities) are compared and correspond, and information such as the extension range of each stratum rock is determined.
The rock specimen and field exploration measuring excitation parameter corresponding method provided by the invention is based on the principle that stratum rock specimens in a research area are collected according to proportion, according to the idea that actually measured field data and specimen test results are in one-to-one correspondence, the data collected by the specimen is regarded as a sample of a sample data full space with a certain network degree in the whole area, a GaussAmp function is utilized to fit field exploration data and specimen measurement results on the whole research area, and the two data sets are compared to determine a peak value, an upper limit value of a background field and a lower limit value of an abnormal value. The peak value is considered as the minimum boundary of the background field and also as the abnormal lower limit of the sulfide deposit, and the abnormal range defined by the value is the induced area.
In order to verify the actual effect of the method, application research is carried out on a certain ore deposit.
The research area comprises granite, limestone and dolomite, and the mineralized body is located on the contact zone of granite and limestone, through the surface survey, and granite accounts for 30%, limestone accounts for 40%, dolomite accounts for 25%, and mineralized body accounts for 5% in the area, then the rock ore sample collection of sample test is gathered on these four different rock ores respectively at random, and the collection proportion also is: granite: limestone: dolomitic rock: mineralizer 30: 40: 25: 5, when 30 pieces of mineralized rock are collected, 150 pieces of dolomite need to be collected, 240 pieces of limestone need to be collected, and 180 pieces of granite need to be collected. The point where the specimen is collected is shown in fig. 4.
The probe parameters are described as the apparent polarizability, and the statistical table of the apparent polarizability is shown in table 1, and the number of collected specimens is about 112 according to lithology and mineralization distribution, and the number of the group distances is 9 according to an empirical curve of the statistical group number of specimens (see fig. 5).
TABLE 1 data sheet for visual polarizability distribution of research area
The empirical curve for which the statistical array is determined is as follows:
processing the 2350 scan data polarizabilities in the whole region by the same method to obtain a sample polarizability test result a and actually measured scan data of the polarizability in the whole region b as shown in fig. 6; comparing the two figures, it can be seen that the physical meaning of the approximate occurrence representation is: the peak value of the background field in the region is higher than the peak value, and the background field is considered to be abnormal. From two gaussian fitted curves: the shapes are similar, but the polarizabilities corresponding to the peak values are different, when the sample test is 6.041%, the plane anomaly corresponding to the research area is 3.5%, which shows that if other reasons are eliminated, the scanning polarizability which is larger than the value is the area of the mineral induced anomaly, the lower limit of the anomaly is determined, and the anomaly range is defined.
Claims (6)
1. A rock specimen and field exploration measurement induced polarization parameter corresponding method is characterized in that: the corresponding method for measuring the induced polarization parameters of the rock specimen and the field exploration comprises the following steps:
1) determining a research area, and carrying out scanning measurement on the research area by an induced polarization method;
2) calculating the types and the proportions of various rock minerals according to a geological plan of a research area, and collecting samples according to not less than 30 rock minerals;
3) carrying out standard processing on the collected specimen;
4) testing the sample subjected to the standard processing in the step 3) by adopting a unified sample testing instrument, and before testing, performing vacuum pumping water saturation treatment on all collected rock samples by using a vacuum saturation device;
5) processing the data obtained in the step 2) and the step 4), and drawing a frequency histogram, wherein the frequency histogram is subjected to GaussAmp function fitting on the frequency histogram by taking the polarization rate/resistivity grouping value as an abscissa and the frequency as an ordinate to obtain a sample fitting curve; the specific fitting mode of the GaussAmp function fitting is as follows:
wherein:
a >0, w >0, y0 ═ 0, xc is the midpoint of the value range, a is the length of the peak, FWHM is the distance between two x corresponding to a/2, w ═ FWHM/sqrt (ln 4);
6) repeating the step 5), fitting the data obtained in the step 1) to obtain an induced polarization method scanning surface fitting curve;
7) comparing the sample fitting curve obtained in the step 5) with the induced polarization method scanning surface fitting curve obtained in the step 6), extracting the maximum value of the sample fitting curve and the maximum value of the induced polarization method scanning surface fitting curve, and comparing the maximum values, wherein the larger value of the two maximum values is the lower abnormal limit.
2. The method for mapping rock specimen to field survey induced electrical parameters according to claim 1, wherein: the specific implementation manner of the step 1) is to perform scanning measurement on the research area by the induced polarization method with reference to technical specification of time domain induced polarization method (DZ/T0070-93).
3. A method of mapping a rock specimen to field survey induced electrical parameters according to claim 2, wherein: and in the step 1), scanning measurement is carried out on main structures perpendicular to a research area at a line distance of 100 meters and at a point distance of 20 meters by the induced polarization method with reference to technical specification of time domain induced polarization method (DZ/T0070-93).
4. A method of mapping a rock specimen to field survey induced electrical parameters according to claim 3, wherein: the specific implementation manner of the step 3) is as follows: and (3) uniformly processing the samples acquired in the step 2) into a standard cuboid by referring to technical rules of investigation on physical properties of rocks (ores) and rocks (DD2006-03), wherein the standard cuboid is 28-54 mm long, 27-40 mm wide and 26-36 mm high.
5. A method of mapping a rock specimen to field survey induced electrical parameters according to claim 4, wherein: the specific implementation mode of testing by adopting a unified specimen testing instrument in the step 4) is as follows: the parameters of the instrument are selected to emit constant voltage 12V, the stacking times are 10 times, the signal time sequence is 2 seconds, and the experimental analysis error is less than 5%.
6. A method of mapping rock specimens to field survey measurement excitation parameters according to claim 1 or 2 or 3 or 4 or 5, wherein: the corresponding method for measuring the excitation parameters of the rock specimen and field exploration further comprises the following steps after the step 7):
8) subdividing the maximum value and the minimum value of the sample fitting curve obtained in the step 5) and the maximum value and the minimum value of the induced polarization method scanning surface fitting curve obtained in the step 6) according to equal intervals, comparing and corresponding ranges corresponding to different lithologic polarizabilities or resistivities, and determining the extension range information of each stratum rock.
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Effective date of registration: 20220823 Address after: No. 898, Section 2, Wanjiali South Road, Changsha City, Hunan Province, 410116 Patentee after: Hunan Geological Survey Institute Address before: No. 898, Section 2, Wanjiali South Road, Changsha City, Hunan Province, 410116 Patentee before: Hunan Provincial Geological Survey |