Method for determining producing area of sandstone

Abstract

The embodiment of the invention relates to the field of testing or analyzing materials by means of measuring chemical or physical properties of the materials, in particular to a method for determining the producing area of sandstone, which comprises the following steps: acquiring a sandstone sample to be determined and a control sample with a known producing area, determining illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer and illite / montmorillonite mixed layer content of the sandstone sample and the control sample; determining chemical weathering indexes of the sandstone sample and the control sample; determining the ratio of the content of SiO2 to the content of Al2O3 in the sandstone sample and the control sample; determining a classification function related to the producing area; and determining the production place of the sandstone sample according to the classification function, the chemical weathering indexes of the control sample and the sandstone sample, the ratio of the content of SiO2 to the content of Al2O3, and the content of illite, montmorillonite, chlorite, kaolinite, a chlorite / montmorillonite mixed layer and an illite / montmorillonite mixed layer. The method provided by the embodiment of the invention can effectively and accurately determine the producing area of the sandstone sample of which the producing area is to be determined.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the field of testing or analyzing materials by means of determining chemical or physical properties of the materials, and in particular to a method for determining the provenance of sandstone. BACKGROUND

[0002] The statements herein are merely provided for background information related to the present application and do not necessarily constitute the prior art.

[0003] Sandstone is a common sedimentary rock, which is widely distributed on the earth's surface. The provenance of sandstone is closely related to the geological history and depositional environment. By determining the provenance of sandstone, it is beneficial to reconstruct the paleogeographic environment, the evolution history of sedimentary basin and the process of tectonic movement; sandstone usually contains important mineral resources such as uranium and copper, and determining the provenance of sandstone is also beneficial to determine the distribution rule of mineral resources. Therefore, it is necessary to study the technology for determining the provenance of sandstone.

[0004] At present, the technology for determining the provenance of sandstone still has many limitations. SUMMARY

[0005] A brief summary of the application is presented in the following to provide a basic understanding of some aspects of the application. It should be understood that this summary is not an exhaustive overview of the application. It is not intended to identify key or important parts of the application nor is it intended to limit the scope of the application. Its purpose is merely to present some concepts in a simplified form as a prelude to the more detailed description of a later discussion.

[0006] In view of the above problems, embodiments of the present application provide a method for determining the provenance of sandstone.

[0007] The method comprises the following steps: S10, obtaining a plurality of sandstone samples of to-be-determined provenances; S20, preparing a plurality of sandstone samples of a first particle size and a plurality of sandstone samples of a second particle size from the plurality of sandstone samples, the first particle size being greater than the second particle size; S30, determining contents of illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer and illite / montmorillonite mixed layer in the plurality of sandstone samples of the first particle size; S40, determining contents of SiO2, K2O, Na2O, CaO and Al2O3 in the plurality of sandstone samples of the second particle size; S50, determining a chemical weathering index of the plurality of sandstone samples of the second particle size and a ratio of SiO2 content to Al2O3 content according to the contents of SiO2, K2O, Na2O, CaO and Al2O3 in the plurality of sandstone samples of the second particle size determined in the step S40; S60, obtaining a plurality of control samples of known provenances, and performing the steps S20-S50 on the plurality of control samples; S70, determining a plurality of classification functions related to provenances of sandstone according to the provenances of the plurality of control samples, the chemical weathering indexes of the plurality of control samples, the ratios of SiO2 content to Al2O3 content of the plurality of control samples, and the contents of illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer and illite / montmorillonite mixed layer in the plurality of control samples; S80, determining the provenances of the plurality of sandstone samples of to-be-determined provenances according to the plurality of classification functions determined in the step S70, the chemical weathering indexes of the plurality of control samples, the ratios of SiO2 content to Al2O3 content of the plurality of control samples, the ratios of SiO2 content to Al2O3 content of the plurality of sandstone samples, the chemical weathering indexes of the plurality of sandstone samples, and the contents of illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer and illite / montmorillonite mixed layer in the plurality of control samples and the plurality of sandstone samples.

[0008] The method provided in the embodiments of the present application determines the classification function related to the origin of the sandstone by determining the chemical weathering index of the control sample, the ratio of the SiO2 content to the Al2O3 content of the control sample, and the contents of illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer and illite / montmorillonite mixed layer in the control sample. Therefore, the origin of the sandstone sample to be determined can be effectively determined based on the classification function related to the origin of the sandstone, the chemical weathering index of the sandstone sample, the ratio of the SiO2 content to the Al2O3 content of the sandstone sample, and the contents of illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer and illite / montmorillonite mixed layer in the sandstone sample. In addition, the complexity of determining the origin of the sandstone sample to be determined can be reduced, the determination efficiency can be improved, and the determination efficiency can be improved. The accuracy of the origin of the sandstone samples can be determined, which is beneficial to providing reliable and accurate technical support for geological research and resource exploration; at the same time, by preparing the obtained sandstone samples and control samples into samples of the first particle size and samples of the second particle size, the processing work of the obtained sandstone samples and the obtained control samples can be minimized, the intermediate links can be reduced, and the probability of contamination of the samples by the intermediate links can be reduced, which is beneficial to accurately measure the above-mentioned content and chemical weathering index of the samples; and, by preparing the obtained sandstone samples and control samples into samples of the first particle size and samples of the second particle size, it is convenient to measure the contents of illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer, illite / montmorillonite mixed layer in the obtained samples and the contents of SiO2, K2O, Na2O, CaO and Al2O3 in the samples. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Other objects and advantages of the present application will become apparent from the following description of the embodiments of the present application with reference to the accompanying drawings, which will help to provide a comprehensive understanding of the present application.

[0010] Figure 1 It is a flowchart of the method provided in the embodiment of the present application.

[0011] Figure 2 is based on Figure 1 A graph showing the relationship between the origin of the control sample determined by the method and the relative distance between the control samples.

[0012] It should be noted that the drawings are not necessarily drawn to scale, but are merely shown in a schematic manner that does not affect the reader's understanding. DETAILED DESCRIPTION

[0013] Exemplary embodiments of the present application will be described herein below with reference to the accompanying drawings. In the description, specific terminology and descriptions are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to those skilled in the art that embodiments of the present application can be practiced without using the specific details set forth herein. In other instances, well-known methods, procedures, components, and networks have not been described in detail so as not to unnecessarily obscure aspects of the present application.

[0014] It should also be noted that, in the description of the present application, only the device structures and / or processing steps closely related to the scheme according to the present application are shown in the drawings, and other details not closely related to the present application are omitted, in order to avoid obscuring the present application with unnecessary details.

[0015] In the related art, the origin of sandstone is determined by using chemical composition and mineral composition of sandstone, but the chemical composition and mineral composition of sandstone are difficult to fully reflect the characteristics of the origin of different sandstone, resulting in that in the process of determining the origin of sandstone, there is a problem of being unable to effectively determine and low determination accuracy.

[0016] In view of the above problems, embodiments of the present application provide a method for determining the origin of sandstone.

[0017] Reference is made to Figure 1 , Figure 1The method provided by the embodiment of the present application is a flowchart of the method, which can comprise the following steps: S10, obtaining a plurality of sandstone samples of unknown provenance; S20, preparing the plurality of sandstone samples into a plurality of sandstone samples of a first particle size and a plurality of sandstone samples of a second particle size, the first particle size being greater than the second particle size; S30, determining the contents of illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer and illite / montmorillonite mixed layer in the plurality of sandstone samples of the first particle size; S40, determining the contents of SiO2, K2O, Na2O, CaO and Al2O3 in the plurality of sandstone samples of the second particle size; S50, determining the chemical weathering index of the plurality of sandstone samples of the second particle size and the ratio of the SiO2 content to the Al2O3 content according to the contents of SiO2, K2O, Na2O, CaO and Al2O3 in the plurality of sandstone samples of the second particle size determined in the step S40; S60, obtaining a plurality of control samples of known provenance, and performing the steps S20-S50 on the plurality of control samples; S70, determining a plurality of classification functions related to the provenance of sandstone according to the provenance of the plurality of control samples, the chemical weathering index of the plurality of control samples, the ratio of the SiO2 content to the Al2O3 content of the plurality of control samples, and the contents of illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer and illite / montmorillonite mixed layer in the plurality of control samples; S80, determining the provenance of the plurality of sandstone samples of unknown provenance according to the plurality of classification functions determined in the step S70, the chemical weathering index of the plurality of control samples, the ratio of the SiO2 content to the Al2O3 content of the plurality of control samples, the ratio of the SiO2 content to the Al2O3 content of the plurality of sandstone samples, the chemical weathering index of the plurality of sandstone samples, and the contents of illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer and illite / montmorillonite mixed layer in the plurality of control samples and the plurality of sandstone samples.

[0018] The method provided by the embodiment of the present application can determine the provenance of the to-be-determined sandstone sample according to the classification function related to the provenance of the sandstone, the chemical weathering index of the sandstone sample, the ratio of the SiO2 content to the Al2O3 content of the sandstone sample, and the content of illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer, and illite / montmorillonite mixed layer in the sandstone sample, can reduce the complexity of determining the provenance of the to-be-determined sandstone sample, improve the determination efficiency, can improve the accuracy of the determined provenance of the sandstone sample, and thus can provide reliable and accurate technical support for geological research and resource exploration. Meanwhile, the sandstone sample and the control sample are prepared into samples of the first particle size and samples of the second particle size, which can minimize the processing work of the obtained sandstone sample and the obtained control sample, reduce intermediate links, and thus reduce the pollution probability of the intermediate links to the samples, and is conducive to accurately measuring the above-mentioned content and the chemical weathering index of the samples. Furthermore, the sandstone sample and the control sample are prepared into samples of the first particle size and samples of the second particle size, which is convenient for measuring the content of illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer, and illite / montmorillonite mixed layer in the obtained samples and the content of SiO2, K2O, Na2O, CaO, and Al2O3 in the samples.

[0019] In some embodiments, the first particle size can be 60-80 mesh, so as to facilitate the measurement of the content of illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer, and illite / montmorillonite mixed layer in the sample of the first particle size. For example, the first particle size can be 70 mesh.

[0020] In some embodiments, the second particle size can be 200 mesh, so as to facilitate the measurement of the content of SiO2, K2O, Na2O, CaO, and Al2O3 in the sample of the second particle size.

[0021] In some embodiments, in the step S20, each sandstone sample can be processed to prepare one sandstone sample of the first particle size and one sandstone sample of the second particle size, that is, the number of sandstone samples of the first particle size and the number of sandstone samples of the second particle size are the same as the number of obtained sandstone samples; in the step S60, the obtained control sample is processed as above.

[0022] In some embodiments, in the step S60, at least three control samples are obtained from each production area when the plurality of control samples are obtained. In such embodiments, at least three control samples are obtained from each production area so as to avoid random errors in subsequent processes and improve the accuracy of the subsequent determination of the content and chemical weathering index.

[0023] In some embodiments, in the step S50, the following steps can also be included: S51, determining the first chemical weathering index of the sandstone samples of the plurality of second particle sizes according to the contents of K2O, Na2O, CaO and Al2O3 in the sandstone samples of the plurality of first particle sizes; S52, determining the second chemical weathering index of the sandstone samples of the plurality of second particle sizes according to the contents of K2O, Na2O, CaO and Al2O3 in the sandstone samples of the plurality of first particle sizes. In such embodiments, by respectively determining the first chemical weathering index and the second chemical weathering index of the plurality of sandstone samples, it is beneficial to improve the accuracy of the determined production area of the sandstone samples by determining the production area of the sandstone samples according to the first chemical weathering index and the second chemical weathering index of the plurality of sandstone samples.

[0024] In some embodiments, in the step S70, the plurality of classification functions related to the production area of the sandstone can be determined according to the production area of the plurality of control samples, the first chemical weathering index of the plurality of control samples, the ratio of the SiO2 content to the Al2O3 content of the plurality of control samples, and the contents of illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer, and illite / montmorillonite mixed layer in the plurality of control samples.

[0025] In some embodiments, in the step S70, the following steps can also be included: S71, determining a plurality of characteristic values related to the origin of the control samples according to the origin of the plurality of control samples, the first chemical weathering index of the plurality of control samples, the ratio of the SiO2 content to the Al2O3 content of the plurality of control samples, and the content of illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer, and illite / montmorillonite mixed layer in the plurality of control samples; S72, determining the contribution rate of each characteristic value in determining the origin according to the plurality of characteristic values; S73, determining a plurality of characteristic values with a contribution rate sum greater than a preset contribution rate value according to the contribution rate of each characteristic value in determining the origin; and S74, determining a plurality of classification functions related to the origin of the sandstone according to the plurality of characteristic values determined in the step S73, the first chemical weathering index of the plurality of control samples, the ratio of the SiO2 content to the Al2O3 content of the plurality of control samples, and the content of illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer, and illite / montmorillonite mixed layer in the plurality of control samples. Since the contribution rate sum of the plurality of characteristic values determined in the step S73 is greater than the preset contribution rate value, the embodiments of the present application can determine the plurality of classification functions related to the origin of the sandstone according to the plurality of characteristic values determined in the step S73, thereby ensuring accuracy, reducing determination difficulty, and improving determination efficiency.

[0026] In some embodiments, the preset contribution rate value can be 80%.

[0027] In some embodiments, in the step S74, the number of the classification functions determined is equal to the number of the characteristic values determined in the step S73.

[0028] Specifically, the contribution rate of each characteristic value in determining the origin satisfies the following relationship

[0029]

[0030] In the formula, P is the contribution rate of each characteristic value, λ i is the characteristic value whose contribution rate is to be determined, λ j is the jth characteristic value related to the origin of the control samples determined in the step S71; n is the number of the characteristic values related to the origin of the control samples determined in the step S71, and j is the summation ordinal.

[0031] In some embodiments, in the step S72, the plurality of characteristic values determined in the step S71 can be sorted in size order to facilitate the determination of the plurality of characteristic values with a contribution rate sum greater than the preset contribution rate value.

[0032] In some embodiments, in the step S74, the following step can also be included: S741, determining that the plurality of classification functions related to the origin of the sandstone satisfy the following relationship:

[0033] Y=∑aC i +bX1+eR+d,

[0034] Where Y is the symbolic value related to the origin of sandstone, a, b, e, d are parameters, and C i is the content of illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer, and illite / montmorillonite mixed layer in the control sample or sandstone sample, X1 is the first chemical weathering index of the control sample or sandstone sample, and R is the ratio of SiO2 content to Al2O3 content in the control sample or sandstone sample; S742, according to the multiple characteristic values ​​determined in step S73, the first chemical weathering index of multiple control samples, the ratio of SiO2 content to Al2O3 content of multiple control samples, and the content of illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer, and illite / montmorillonite mixed layer in multiple control samples, determine a, b, e, and d. Since the sum of the contribution rates of the multiple eigenvalues ​​determined in step S73 is greater than the preset contribution rate value, the embodiment of the present application determines a, b, e and d based on the multiple eigenvalues ​​determined in step S73, which can not only ensure the accuracy of the determined a, b, e and d, but also reduce the difficulty of determination and improve the efficiency of determination; and, the embodiment of the present application determines multiple classification functions related to the origin of sandstone through the above-mentioned relationship, which is conducive to improving the efficiency of determining the classification functions related to the origin of sandstone.

[0035] In some embodiments, in the step S71, the following steps can also be included: S711, determining the mean value of the first chemical weathering index of the plurality of samples according to the first chemical weathering index of the plurality of control samples; S712, determining the mean value of the content of illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer, illite / montmorillonite mixed layer in the plurality of control samples according to the content of illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer, illite / montmorillonite mixed layer in the plurality of control samples; S713, determining the mean value of the ratio of SiO2 content to Al2O3 content of the plurality of control samples according to the ratio of SiO2 content to Al2O3 content of the plurality of control samples; S714, determining the difference between the first chemical weathering index of each control sample and the mean value determined in the step S711 according to the mean value determined in the step S711 and the first chemical weathering index of each control sample; S715, determining the difference between the content of illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer, illite / montmorillonite mixed layer in each control sample and the mean value determined in the step S712 according to the mean value determined in the step S712 and the content of illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer, illite / montmorillonite mixed layer in each control sample; S716, determining the difference between the ratio of SiO2 content to Al2O3 content of each control sample and the mean value determined in the step S713 according to the mean value determined in the step S713 and the ratio of SiO2 content to Al2O3 content of each control sample; S717, determining a plurality of characteristic values related to the origin of the control samples according to the difference determined in the step S714, the difference determined in the step S715 and the difference determined in the step S716. In such embodiments, the plurality of characteristic values related to the origin of the control samples are determined according to the difference between the chemical weathering index of each control sample and the mean value of the chemical weathering index of the control samples, the difference between the ratio of SiO2 content to Al2O3 content of each control sample and the mean value of the ratio of SiO2 content to Al2O3 content of the control samples, and the difference between the content of illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer, illite / montmorillonite mixed layer in each control sample and the mean value of the content of illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer, illite / montmorillonite mixed layer in the control samples, so that the determined plurality of characteristic values related to the origin of the control samples can comprehensively reflect the characteristics of various origins, thereby facilitating the improvement of the efficiency and accuracy when subsequently determining the origin of the plurality of sandstone samples to be determined.

[0036] In some embodiments, in the step S717, the following steps can also be included: S7171, determining a first vector composed of the difference values determined in the step S714; S7172, determining a plurality of second vectors composed of the difference values determined in the step S715; S7173, determining a third vector composed of the difference values determined in the step S716; S7174, determining a matrix composed of the first vector, the plurality of second vectors and the third vector; S7175, determining an intermediate matrix related to the provenance of the reference samples according to the matrix determined in the step S7174; S7176, determining a plurality of eigenvalues related to the provenance of the sandstone according to the intermediate matrix determined in the step S7175.

[0037] Specifically, the matrix D determined in the step S7174 is

[0038]

[0039] wherein d 11 to d m1 represent the difference values determined in the step S714, d 12 to d m2 represent the difference values determined in the step S715; d 13 to d m3 represent the difference values determined in the step S716, and m is the number of the reference samples. 14 to d m4 , d 15 to d m5 , d 16 to d m6 , d 17 to d m7 represent the difference values determined in the step S716, and m is the number of the reference samples. 18 to d m8 The intermediate matrix ∑ determined in the step S7175 satisfies the following relationship with the matrix D determined in the step S7174

[0040]

[0041] The intermediate matrix ∑ determined in the step S7175 and the plurality of eigenvalues related to the provenance of the sandstone satisfy the following relationship

[0042] det(∑-λI)=0,

[0043] wherein λ is the eigenvalue related to the provenance of the sandstone, and I is a unit matrix with the same number of elements as the intermediate matrix ∑.

[0044] In some embodiments, in the step S742, the following steps can also be included: S7421, determining a plurality of intermediate vectors V i; S7422, the intermediate vector V determined according to S7421 i , the first chemical weathering index of the plurality of control samples, the ratio of Si02 content to Al203 content of the plurality of control samples, and the illite, smectite, chlorite, kaolinite, chlorite / smectite mixed layer, illite / smectite mixed layer content in the plurality of control samples, to determine a, b, e, and d.

[0045] In particular, the plurality of characteristic values determined in S73, the intermediate matrix ∑ determined in S7175, and the intermediate vector V i satisfy the following relationship

[0046] (∑ - λ i I) V i = 0,

[0047] wherein λ i is the ith eigenvalue determined in S73.

[0048] In some embodiments, in S7422, the first chemical weathering index of the plurality of control samples, the ratio of Si02 content to Al203 content of the plurality of control samples, and the illite, smectite, chlorite, kaolinite, chlorite / smectite mixed layer, illite / smectite mixed layer content in the plurality of control samples can be multiplied by and summed with the corresponding intermediate vector V i to determine a, b, e, and d.

[0049] In some embodiments, in the step S80, the following steps can also be included: S81, determining the classification function values corresponding to each of the control samples according to the plurality of classification functions determined in the step S74, the first chemical weathering index of each of the control samples, and the contents of illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer, and illite / montmorillonite mixed layer in each of the control samples, and the ratio of the content of SiO2 to the content of Al2O3 in each of the control samples; S82, determining the distance between any two of the control samples in the plurality of control samples according to the second chemical weathering index of each of the control samples and the classification function values corresponding to each of the control samples; S83, determining the relative distance between any two of the control samples in the plurality of control samples according to the distance determined in the step S82; S84, determining the relationship between the relative distance of the sandstone and the origin of the sandstone according to the origin of the plurality of control samples and the relative distance between any two of the control samples in the plurality of control samples; S85, performing the steps S81-S83 on the plurality of sandstone samples to determine the relative distance between any two of the sandstone samples in the plurality of sandstone samples; and S86, determining the origin of the plurality of sandstone samples with an unknown origin according to the relationship determined in the step S84 and the relative distance determined in the step S85. In such embodiments, the origin of the sandstone samples with an unknown origin is determined according to the relative distance between any two of the sandstone samples with an unknown origin and the relationship determined in the step S84, which can avoid errors caused by the foregoing operations and facilitate accurate determination of the origin of the sandstone samples with an unknown origin.

[0050] In some embodiments, in the step S83, the following steps can also be included: S831, determining the maximum distance in the distances determined in the step S82; S832, determining the maximum relative distance corresponding to the maximum distance determined in the step S831; S833, determining the proportion between all the distances in the distances determined in the step S82 and the maximum distance; and S834, determining the relative distance between any two of the control samples in the plurality of control samples according to the maximum relative distance determined in the step S832 and the proportion determined in the step S833. In such embodiments, the distance between any two of the sandstone samples in the plurality of sandstone samples is converted into the relative distance between any two of the sandstone samples in the plurality of sandstone samples by the foregoing steps, which can reduce the difficulty in determining the relationship between the relative distance of the samples with a known origin and the samples with a known origin and facilitate improvement of the efficiency in determining the origin of the sandstone samples with an unknown origin.

[0051] In some embodiments, in the step S832, the relative distance corresponding to the maximum distance determined in the step S831 can be set as the standard A4 paper transverse printing size. Preferably, the relative distance corresponding to the maximum distance determined in the step S831 can be set as 25 to reduce the calculation amount in determining the relative distance between any two of the sandstone samples in the plurality of sandstone samples.

[0052] In some embodiments, the relative distance between any two of the plurality of sandstone samples, the distance between any two of the plurality of sandstone samples, the maximum distance, and the maximum relative distance satisfy the following relationship:

[0053]

[0054] wherein D x represents the relative distance between any two of the plurality of sandstone samples, represents the maximum relative distance, D represents the distance between any two of the plurality of sandstone samples, and D max represents the maximum distance. In such embodiments, the relative distance between any two of the plurality of sandstone samples can be efficiently and accurately determined according to the above relationship, which is conducive to improving the efficiency of determining the provenance of the sandstone sample to be determined.

[0055] In some embodiments, in the step S82, the second chemical weathering index of each control sample, the plurality of classification function values corresponding to each control sample, and the distance between any two of the plurality of control samples satisfy the following relationship:

[0056] D =∑(x i -y i ) 2 ,

[0057] wherein D is the distance between any two of the plurality of sandstone samples, x i is the second chemical weathering index of any one of the plurality of control samples or the plurality of classification function values corresponding thereto, and y i is the second chemical weathering index of another one of the plurality of control samples or the plurality of classification function values corresponding thereto. In such embodiments, the distance between any two of the plurality of sandstone samples can be efficiently and accurately determined according to the above relationship, which is conducive to improving the efficiency of determining the provenance of the sandstone sample.

[0058] In some embodiments, in the step S84, the method further comprises the following steps: S841, determining a relationship diagram between the provenance of the plurality of control samples and the relative distance between any two of the plurality of control samples; and S842, determining a distribution area of the plurality of control samples in the relationship diagram, i.e., the relationship between the relative distance of the sandstone and the provenance of the sandstone. In such embodiments, by determining the relationship diagram, the relationship between the relative distance of the sandstone and the provenance of the sandstone can be intuitively displayed and determined through the relationship diagram, and then the provenance of the sample to be determined can be determined through the above relationship.

[0059] In some embodiments, in step S841, the control samples can be taken as the vertical direction of the classification graph, the relative distance between any two samples in the control samples can be taken as the horizontal direction of the classification graph, and the relationship graph can be obtained by connecting the samples belonging to the same origin.

[0060] In some embodiments, in step S842, the origin classification distance can be determined according to the number of origins of the control samples and the maximum relative distance, and the relationship graph can be divided according to the determined origin classification distance to determine the distribution area of the control samples in the relationship graph. For example, the control samples come from 3 origins, and the maximum relative distance is 25, and the origin classification distance can be 10.

[0061] In some embodiments, in step S85, the following steps can also be included: S851, determining the positions of the plurality of sandstone samples in the relationship graph according to the relative distance between any two sandstone samples in the plurality of sandstone samples and the relationship graph; S852, determining the control samples in the same distribution area as the sandstone samples of the to-be-determined origin in the relationship graph according to the positions of the plurality of sandstone samples in the relationship graph and the distribution areas of the plurality of control samples in the relationship graph; S853, determining the origin of the sandstone samples of the to-be-determined origin according to the origins of the control samples in the same distribution area as the sandstone samples of the to-be-determined origin. Since the samples of the same origin are distributed in the same area in the relationship graph, in such embodiments, the control samples belonging to the same origin as the sandstone samples of the to-be-determined origin are determined according to the distribution of the sandstone samples of the to-be-determined origin in the relationship graph and the distribution of the control samples in the relationship graph, so that the origin of the sandstone samples of the to-be-determined origin can be determined according to the origin of the control samples, which is beneficial to intuitively and efficiently determining the origin of the sandstone samples of the to-be-determined origin.

[0062] In some embodiments, before the step S70, the method further comprises: S700, correcting the illite, smectite, chlorite, kaolinite, chlorite / smectite mixed-layer, illite / smectite mixed-layer content in the plurality of sandstone samples of the first granularity determined in the step S30. In the step S71, the plurality of characteristic values related to the provenance of the control samples are determined according to the provenance of the plurality of control samples, the first chemical weathering index of the plurality of control samples, the ratio of the SiO2 content to the Al2O3 content of the plurality of control samples, and the illite, smectite, chlorite, kaolinite, chlorite / smectite mixed-layer, illite / smectite mixed-layer content corrected in the step S700. In such embodiments, the illite, smectite, chlorite, kaolinite, chlorite / smectite mixed-layer, illite / smectite mixed-layer content in the plurality of sandstone samples of the first granularity is corrected first, and then the distance between any two sandstone samples in the plurality of sandstone samples is determined according to the corrected illite, smectite, chlorite, kaolinite, chlorite / smectite mixed-layer, illite / smectite mixed-layer content, which can reduce the complexity of the process of determining the distance between any two sandstone samples in the plurality of sandstone samples and simplify the operation of determining the distance between any two sandstone samples in the plurality of sandstone samples.

[0063] In some embodiments, in the step S700, the illite, smectite, chlorite, kaolinite, chlorite / smectite mixed-layer, illite / smectite mixed-layer content in the plurality of sandstone samples of the first granularity is multiplied by 100 to obtain the corrected illite, smectite, chlorite, kaolinite, chlorite / smectite mixed-layer, illite / smectite mixed-layer content.

[0064] In some embodiments, in the step S51, the method can further comprise: S511, determining that the CaO content in each sandstone sample is greater than the Na2O content; S512, determining the first chemical weathering index of each sandstone sample according to the K2O content, the Na2O content, and the Al2O3 content in each sandstone sample. During the digestion process, CaO and Na2O interfere with each other, resulting in inaccurate measured CaO content or Na2O content. The embodiments of the present application can avoid the influence of inaccurate CaO content on the determination of the first chemical weathering index by determining that the CaO content is greater than the Na2O content and determining the chemical weathering index according to the K2O content, the Na2O content, and the Al2O3 content, so as to ensure the accuracy of the determined first chemical weathering index.

[0065] In some embodiments, the first chemical weathering index, the K2O content, the Na2O content, and the Al2O3 content of the plurality of sandstone samples of the second granularity satisfy the following relationship:

[0066] Z = 2 x Al2O3 / (Al2O3 + 2Na2O + K2O) x 100,

[0067] In the formula, Z represents the first chemical weathering index of the plurality of sandstone samples of the second particle size, K2O represents the K2O content, Na2O represents the Na2O content, and Al2O3 represents the Al2O3 content. In such an embodiment, according to the above relationship, the chemical weathering index of the plurality of sandstone samples of the second particle size can be accurately determined.

[0068] In some embodiments, in the step S51, the following steps can also be included: S511', determining that the CaO content in each sandstone sample is less than or equal to the Na2O content; S512', determining the first chemical weathering index of each sandstone sample according to the K2O content, the Na2O content, the CaO content, and the Al2O3 content in each sandstone sample. During the digestion process, CaO and Na2O interfere with each other, resulting in inaccurate measured CaO content or Na2O content. The embodiments of the present application can avoid affecting the determination of the first chemical weathering index by determining that the CaO content is less than or equal to the Na2O content, and determining the chemical weathering index according to the K2O content, the Na2O content, the CaO content, and the Al2O3 content, so as to ensure the accuracy of the determined first chemical weathering index.

[0069] In some embodiments, the first chemical weathering index of the plurality of sandstone samples of the second particle size, the K2O content, the Na2O content, the CaO content, and the Al2O3 content satisfy the following relationship:

[0070] Z = 2 x Al2O3 / (Al2O3 + 2Na2O + K2O) x 100,

[0071] In the formula, Z represents the first chemical weathering index of the plurality of sandstone samples of the second particle size, Al2O3 represents the Al2O3 content, CaO represents the CaO content, Na2O represents the Na2O content, and K2O represents the K2O content. In such an embodiment, according to the above relationship, the first chemical weathering index of the plurality of sandstone samples of the second particle size can be accurately determined.

[0072] In some embodiments, in the step S52, the second chemical weathering index of each sandstone sample is determined according to the K2O content, the Na2O content, the CaO content, the Fe2O3 content, the MgO content, and the Al2O3 content of each sandstone sample, which is beneficial to accurately determine the second chemical weathering index of the plurality of sandstone samples of the second particle size.

[0073] In some embodiments, the second chemical weathering index, the K2O content, the Na2O content, the CaO content, the Fe2O3 content, the MgO content, and the Al2O3 content of the plurality of sandstone samples of the second particle size satisfy the following relationship:

[0074] R = (Fe2O3 + Na2O + K2O + CaO + MgO) / Al2O3,

[0075] In the formula, R represents the second chemical weathering index of the plurality of sandstone samples of the second particle size, Fe2O3 represents the Fe2O3 content, Na2O represents the Na2O content, K2O represents the K2O content, CaO represents the CaO content, MgO represents the MgO content, and Al2O3 represents the Al2O3 content.

[0076] In some embodiments, in the step S40, the following steps can be further included: S41, pretreating the plurality of sandstone samples of the second particle size; S42, digesting the plurality of pretreated sandstone samples of the second particle size; and S43, determining the contents of different chemical composition components in the plurality of digested sandstone samples of the second particle size. In such embodiments, the pretreatment of the plurality of sandstone samples of the second particle size can remove calcite crystals in the plurality of sandstone samples of the second particle size, so as to avoid the influence of the calcite crystals on the measurement of the contents of K2O, Na2O, CaO, Fe2O3, MgO, and Al2O3. Meanwhile, the digestion of the plurality of pretreated sandstone samples of the second particle size can facilitate the measurement of the contents of K2O, Na2O, CaO, Fe2O3, MgO, and Al2O3.

[0077] In some embodiments, in the step S41, dilute hydrochloric acid can be used to pretreat the plurality of sandstone samples of the second particle size. In such embodiments, the pretreatment of the plurality of sandstone samples of the second particle size with dilute hydrochloric acid can remove calcite crystals in the plurality of sandstone samples of the second particle size, and can avoid the influence on the measurement of the contents of K2O, Na2O, CaO, Fe2O3, MgO, and Al2O3 in the plurality of sandstone samples of the second particle size, so as to facilitate the accuracy of the measured contents of K2O, Na2O, CaO, Fe2O3, MgO, and Al2O3.

[0078] In some embodiments, in the step S42, a mixed acid composed of HNO3-HF-HClO4 can be used to digest the plurality of pretreated sandstone samples of the second particle size. In such embodiments, the digestion of the plurality of pretreated sandstone samples of the second particle size with the mixed acid composed of HNO3-HF-HClO4 can ensure the high purity of the reagents used for digestion, avoid the introduction of impurities in the digestion process, and thus avoid the influence on the accuracy of the measured contents of K2O, Na2O, CaO, Fe2O3, MgO, and Al2O3.

[0079] In some embodiments, in the step S30, the following steps can also be included: S31, pressing the plurality of sandstone samples of the first granularity into a plurality of tablet samples; S32, repeatedly measuring the illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer, and illite / montmorillonite mixed layer content in the plurality of tablet samples, and taking the average of the plurality of repeated measurements as the illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer, and illite / montmorillonite mixed layer content in the plurality of sandstone samples of the first granularity. In such embodiments, pressing the sandstone samples of the first granularity into tablet samples can reduce the voids in the samples, ensure the measurement accuracy, and facilitate accurate measurement of the content, thereby improving the accuracy of the measured illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer, and illite / montmorillonite mixed layer content; and repeatedly measuring the tablet samples and taking the average of the plurality of repeated measurements as the illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer, and illite / montmorillonite mixed layer content in the plurality of sandstone samples of the first granularity can avoid accidental errors during measurement, and also facilitate the improvement of the accuracy of the measured illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer, and illite / montmorillonite mixed layer content.

[0080] In some embodiments, in the step S31, a tablet press can be used to press the plurality of sandstone samples of the first granularity into a plurality of tablet samples. Specifically, the pressure of the tablet press can be set to a maximum value of 20 tons, and the constant pressure pressing can be performed for 1 minute.

[0081] In some embodiments, in the step S31, a tablet press can be used to press the plurality of sandstone samples of the first granularity into a plurality of tablet samples. Specifically, the pressure of the tablet press can be set to a maximum value of 20 tons, and the constant pressure pressing can be performed for 1 minute.

[0082] In some embodiments, in the step S32, X-ray can be used to measure the illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer, and illite / montmorillonite mixed layer content in the tablet samples. Specifically, the X-ray tube voltage can be set to a maximum value of 50 kV, the current can be set to a maximum value of 100 mA, and the detection time can be set to 30 seconds.

[0083] In some embodiments, in the step S32, each tablet sample can be measured 3-10 times, and the average of the 3-10 measurements can be taken as the illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer, and illite / montmorillonite mixed layer content in the sandstone sample of the first granularity. For example, each tablet sample can be measured 5 times.

[0084] In some embodiments, before the step S31, there can further comprise: S300, treating the plurality of sandstone samples of the first granularity with H2O2 or dilute acetic acid, and extracting clay particles with a particle size less than 2 pm by using a sedimentation method or a centrifugal method. In the step S31, the clay particles extracted in the step S300 are pressed into the tablet samples. In such embodiments, the plurality of sandstone samples of the first granularity are treated with H2O2 or dilute acetic acid, so that the sandstone samples of the first granularity can be converted into clay particles, facilitating the subsequent extraction of clay particles with a particle size less than 2 pm; at the same time, the plurality of sandstone samples of the first granularity are treated with H2O2 or dilute acetic acid, which can avoid the influence of the added reagents on illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer and illite / montmorillonite mixed layer in the sandstone samples of the first granularity, and is conducive to accurately measuring the contents of illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer and illite / montmorillonite mixed layer in the sandstone samples of the first granularity; and the extraction of clay particles with a particle size less than 2 pm facilitates the pressing of the clay particles into the tablet samples in the step S31.

[0085] The process of determining the origin of sandstone by using the method provided by the embodiments of the present application is described below. A total of 21 samples of known origin are Cretaceous sandstone samples, and the 21 samples are respectively from the Songliao Basin, the Eren Basin, the Ordos Basin and the Junggar Basin. Specifically, 5 samples are from the Songliao Basin, 4 samples are from the Eren Basin, 8 samples are from the Ordos Basin, and 4 samples are from the Junggar Basin.

[0086] (1) First, the above 21 samples are respectively made into 21 samples of 70 mesh and 21 samples of 200 mesh according to 70 mesh and 200 mesh; then, the 21 samples of 70 mesh are treated with dilute acetic acid, and clay particles with a particle size less than 2 pm after treatment are extracted; then, the clay particles are pressed into 21 tablet samples by using a tablet press under a pressure of 20 tons for 1 minute.

[0087] (2) Then, the X-ray tube voltage is set to the maximum value of 50 kV, the current is set to the maximum value of 100 mA, the detection time is set to 30 seconds, the X-ray emitted by the X-ray tube is used to measure the contents of illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer and illite / montmorillonite mixed layer in the 21 tablet samples, each tablet sample is measured 5 times, and the average value of the 5 measurements is taken as the contents of illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer and illite / montmorillonite mixed layer in each sample of 70 mesh.

[0088] (3) The 21 200 mesh samples were pretreated with dilute hydrochloric acid, and after the pretreatment was completed, the 21 pretreated 200 mesh samples were digested with HNO3-HF-HClO4, and the SiO2, K2O, Na2O, CaO and Al2O3 contents in the 21 digested 200 mesh samples were measured; then, according to the SiO2, K2O, Na2O, CaO and Al2O3 contents in the 21 200 mesh samples, the first chemical weathering index X1, the second chemical weathering index X2 and the SiO2 content to Al2O3 content ratio of each 200 mesh sample were determined. Referring to Table 1 below, the illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer and illite / montmorillonite mixed layer contents in the 21 70 mesh samples, and the first chemical weathering index X1 of the 21 200 mesh samples and the SiO2 content to Al2O3 content ratio of the 21 200 mesh samples are shown in Table 1 below.

[0089] Table 1 Contents, first chemical weathering index and SiO2 content to Al2O3 content ratio in the 21 samples

[0090]

[0091]

[0092] (4) The illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer and illite / montmorillonite mixed layer contents in the 21 70 mesh samples were multiplied by 100 for correction; then, according to the first chemical weathering index of the 21 200 mesh samples and the illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer and illite / montmorillonite mixed layer contents in the 21 70 mesh samples after correction, and the SiO2 content to Al2O3 content ratio of the 21 200 mesh samples, the intermediate matrix ∑ was determined.

[0093] Referring to Table 2 below, the elements in the determined intermediate matrix ∑ are shown in Table 2.

[0094] Table 2 Elements in the determined intermediate matrix ∑

[0095]

[0096] (5) According to the above intermediate matrix, 8 eigenvalues were calculated; then the contribution rates of the 8 eigenvalues and the sum of the contribution rates (also referred to as cumulative contribution rate) were calculated.

[0097] Referring to Table 3 below, the 8 calculated eigenvalues, the contribution rates of the 8 eigenvalues and the cumulative contribution rates of the 8 eigenvalues are shown in Table 3.

[0098] Table 3 determined eigenvalues, eigenvalue contribution rate and cumulative contribution rate

[0099]

[0100]

[0101] As can be seen from Table 3, the first seven eigenvalues are greater than 1, wherein the first eigenvalue λ1 reaches 1420.314, the contribution rate reaches 71.691%; the second eigenvalue λ2 is 425.752, the contribution rate is 93.181%, the third eigenvalue λ3 is 77.204, the contribution rate is 97.078%, wherein the cumulative contribution rate of the first two eigenvalues has reached 93.181% which is greater than the preset contribution rate value 80%, therefore, the first classification function and the second classification function related to the origin of sandstone are determined according to the first two eigenvalues.

[0102] Referring to Table 4 below, the coefficients in the first classification function and the second classification function determined according to the first two eigenvalues are shown in Table 4.

[0103] Table 4 determined coefficients in the classification function

[0104] First classification function Second classification function Illite -0.120 0.313 Chlorite -0.086 0.285 Montmorillonite 0.096 -0.048 Kaolinite -0.003 -0.010 Chlorite / Montmorillonite intergrade 0.524 -0.437 Illite / Montmorillonite intergrade -0.430 -0.691 X1 -0.003 0.003 SiO2 / Al2O3 0.032 -0.022

[0105] According to the coefficients in Table 4 above, the first classification function and the second classification function are determined as

[0106] Y1 = -0.12 x Ill - 0.086 x Chl + 0.096 x Mnt - 0.003 x Kln + 0.524 x CM -

[0107] 0.43 x IM - 0.003 x X1 + 0.032 x SiO2 / Al2O3,

[0108] Y2 = 0.313 x Ill + 0.285 x Chl - 0.048 x Mnt - 0.01 x Kln - 0.437 x CM -

[0109] 0.691 x IM + 0.003 x X1 - 0.022 x SiO2 / Al2O3,

[0110] wherein Y1 and Y2 are the first classification function value and the second classification function value, Ill is the illite content, Chl is the chlorite content, Mnt is the montmorillonite content, Kln is the kaolinite content, CM is the chlorite / montmorillonite mixed layer content, IM is the illite / montmorillonite mixed layer content, X1 is the first chemical weathering index, SiO2 / Al2O3 is the ratio of SiO2 content to Al2O3 content.

[0111] (6) The illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer, illite / montmorillonite mixed layer content in the 21 70-mesh samples, the first chemical weathering index of the 21 200-mesh samples, and the ratio of SiO2 content to Al2O3 content of the 21 200-mesh samples are substituted into the two classification functions above to obtain the first classification function value Y1 and the second classification function value Y2 of the 21 samples; thereafter, according to the first classification function value Y1, the second classification function value Y2 of the 21 samples, and the second chemical weathering index X2 of the 21 200-mesh samples, the distance between any two samples in the 21 samples is calculated.

[0112] Referring to Tables 5, 6 and 7 below, Table 5 shows the first classification function value Y1, the second classification function value Y2 of the 21 samples, and the second chemical weathering index X2 of the 21 200-mesh samples, and Tables 6 and 7 show the distance between any two samples in the 21 samples.

[0113]

[0114]

[0115] Table 6 Distance between any two samples in the 21 samples

[0116]

[0117]

[0118] Table 7 Distance between any two samples in the 21 samples

[0119]

[0120] In Table 6 and Table 7, 1 in the first column and the first row indicates a sample from Songliao Basin, 2 in the first column and the first row indicates a sample from Erenhot Basin, 3 in the first column and the first row indicates a sample from Ordos Basin, and 4 in the first column and the first row indicates a sample from Junggar Basin.

[0121] (7) The distances D between the 21 samples are sorted in size, and the maximum distance D max 15.425 is converted into the maximum relative distance 25, and the distances between the remaining two samples are converted into the corresponding relative distances according to the proportion of the distance to the maximum distance.

[0122] (8) According to the relative distance between any two samples in the 21 samples and the producing areas of the 21 samples, a classification map is determined, see Figure 2 , Figure 2 is determined according to the method shown in the figure, Figure 1 The relationship map of the producing areas of the control samples and the relative distance between the control samples is determined according to the method shown in the figure, Figure 2 The 21 samples in the figure are from 4 producing areas, and the classification distance of the producing areas is set to 5. It can be seen from Figure 2 It can be seen from the figure that the sandstone samples are classified into different categories according to the producing areas. The dendrogram is cut off at a relative distance of 5, and the sandstone samples are classified into 4 categories. It can be seen that 8 sandstone samples in the Ordos Basin and 4 sandstone samples in the Erenhot Basin are well classified into two categories. Except that 2 sandstone samples in the Junggar Basin are misclassified into the Erenhot Basin and 1 sandstone sample in the Songliao Basin is classified into a separate category, the rest are correct. It can be seen that the method of the present application is used to classify the sandstone samples according to the producing areas, and most of the sandstone samples are accurately classified according to the producing areas.

[0123] (9) A plurality of (for example, 17) sandstone samples are obtained, steps (1)-(7) are performed on the obtained plurality of sandstone samples, and the position of each sandstone sample in the classification map is determined according to the relative distance between any two sandstone samples in the plurality of sandstone samples, and the producing area of each sandstone sample is determined.

[0124] For the embodiments of the present application, it should also be noted that the embodiments of the present application and the features in the embodiments can be combined with each other to obtain new embodiments without conflict.

[0125] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A method for determining the origin of sandstone, characterized in that: The method comprises the following steps: S10, obtaining multiple sandstone samples of to-be-determined origin; S20, preparing the plurality of sandstone samples into a plurality of sandstone samples with a first particle size and a plurality of sandstone samples with a second particle size, wherein the first particle size is greater than the second particle size; S30, determining the contents of illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer, and illite / montmorillonite mixed layer in the plurality of sandstone samples of the first particle size; S40, determining the contents of SiO2, K2O, Na2O, CaO, and Al2O3 in the plurality of sandstone samples of the second particle size; S50, determining the chemical weathering index and the ratio of SiO2 content to Al2O3 content of the plurality of sandstone samples of the second particle size according to the SiO2, K2O, Na2O, CaO and Al2O3 contents in the plurality of sandstone samples of the second particle size determined in step S40; S60, obtaining a plurality of control samples of known origin, and performing steps S20 to S50 on the plurality of control samples; S70, determining a plurality of classification functions related to the origin of the sandstone according to the origins of the plurality of control samples, the chemical weathering index of the plurality of control samples, the ratio of the SiO2 content to the Al2O3 content of the plurality of control samples, and the contents of illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer, and illite / montmorillonite mixed layer in the plurality of control samples; S80. Determine the origin of the multiple sandstone samples whose origin is to be determined based on the multiple classification functions determined in step S70, the chemical weathering index of the multiple control samples, the ratio of SiO2 content to Al2O3 content in the multiple control samples, the ratio of SiO2 content to Al2O3 content in the multiple sandstone samples, the chemical weathering index of the multiple sandstone samples, and the contents of illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer, and illite / montmorillonite mixed layer in the multiple control samples and the contents of illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer, and illite / montmorillonite mixed layer in the multiple sandstone samples.

2. The method according to claim 1, characterized in that In step S50, the following steps are also included: S51, determining a first chemical weathering index of the plurality of sandstone samples of the second particle size according to the contents of K2O, Na2O, CaO, and Al2O3 in the plurality of sandstone samples of the first particle size; S52. Determine a second chemical weathering index of the plurality of sandstone samples of the second particle size according to the contents of K2O, Na2O, CaO, and Al2O3 in the plurality of sandstone samples of the first particle size.

3. The method according to claim 2, characterized in that In step S70, the following steps are also included: S71. Determine a plurality of characteristic values ​​associated with the origins of the plurality of control samples based on the origins of the plurality of control samples, the first chemical weathering index of the plurality of control samples, the ratios of SiO2 content to Al2O3 content of the plurality of control samples, and the contents of illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer, and illite / montmorillonite mixed layer in the plurality of control samples; S72. Determine, based on the multiple characteristic values, a contribution rate of each characteristic value in determining the origin; S73. Determine, based on the contribution rate of each characteristic value in determining the place of origin, a plurality of characteristic values ​​whose sum of contribution rates is greater than a preset contribution rate value; S74. Determine the multiple classification functions related to the origin of the sandstone based on the multiple characteristic values ​​determined in step S73, the first chemical weathering index of the multiple control samples, the ratio of SiO2 content to Al2O3 content of the multiple control samples, and the content of illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer, and illite / montmorillonite mixed layer in the multiple control samples.

4. The method according to claim 3, characterized in that In step S74, the following steps are also included: S741. Determine whether multiple classification functions related to the origin of sandstone conform to the following relationship: Y=∑aC i +bX1+eR+d, Where Y is the symbolic value related to the origin of sandstone, a, b, e, d are parameters, and C i is the content of illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer, or illite / montmorillonite mixed layer in the control sample or the sandstone sample, X1 is the first chemical weathering index of the control sample or the sandstone sample, and R is the ratio of SiO2 content to Al2O3 content in the control sample or the sandstone sample; S742. Determine a, b, e, and d based on the multiple characteristic values ​​determined in step S73, the first chemical weathering index of the multiple control samples, the ratio of SiO2 content to Al2O3 content of the multiple control samples, and the contents of illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer, and illite / montmorillonite mixed layer in the multiple control samples.

5. The method according to claim 3, characterized in that In step S71, the following steps are also included: S711. Determine an average value of the first chemical weathering indices of the plurality of control samples according to the first chemical weathering indices of the plurality of control samples; S712. Determine the average values ​​of the contents of illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer, and illite / montmorillonite mixed layer in the plurality of control samples based on the contents of illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer, and illite / montmorillonite mixed layer in the plurality of control samples; S713. Determine an average of the ratios of the SiO 2 content to the Al 2 O 3 content of the plurality of control samples according to the ratios of the SiO 2 content to the Al 2 O 3 content of the plurality of control samples; S714. Determine, based on the mean value determined in step S711 and the first chemical weathering index of each of the control samples, the difference between the first chemical weathering index of each of the control samples and the mean value determined in step S711. S715. Determine the difference between the illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer, and illite / montmorillonite mixed layer content in each of the control samples and the mean value determined in step S712, based on the mean value determined in step S712 and the illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer, and illite / montmorillonite mixed layer content in each of the control samples; S716. Determine, based on the mean value determined in step S713 and the ratio of the SiO2 content to the Al2O3 content of each of the control samples, the difference between the ratio of the SiO2 content to the Al2O3 content of each of the control samples and the mean value determined in step S713; S717. Determine the multiple characteristic values ​​related to the origin of the control sample based on the difference determined in step S714, the difference determined in step S715, and the difference determined in step S716.

6. The method according to claim 3, characterized in that In step S80, the following steps are also included: S81, determining a plurality of classification function values ​​corresponding to each of the control samples according to the plurality of classification functions determined in step S74, the first chemical weathering index of each of the control samples, and the content of illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer, and illite / montmorillonite mixed layer in each of the control samples, and the ratio of the SiO2 content to the Al2O3 content of each of the control samples; S82, determining a distance between any two of the plurality of control samples according to the second chemical weathering index of each control sample and a plurality of classification function values ​​corresponding to each control sample; S83, determining the relative distance between any two of the plurality of control samples according to the distance determined in step S82; S84. Determine the relationship between the relative distance of the sandstone and the origin of the sandstone based on the origins of the multiple control samples and the relative distance between any two of the multiple control samples; S85, performing steps S81 to S83 on the plurality of sandstone samples to determine the relative distance between any two of the plurality of sandstone samples; S86. Determine the origins of the plurality of sandstone samples whose origins are to be determined based on the relationship determined in step S84 and the relative distances determined in step S85.

7. The method according to claim 6, characterized in that In step S83, the following steps are also included: S831, determining the maximum distance among the distances determined in step S82; S832. Determine a maximum relative distance corresponding to the maximum distance determined in step S831; S833, determining the ratio between all the distances determined in step S82 and the maximum distance; S834. Determine the relative distance between any two of the multiple control samples based on the maximum relative distance determined in step S832 and the ratio determined in step S833.

8. The method according to claim 6, characterized in that In step S82, the second chemical weathering index of each control sample, the multiple classification function values ​​corresponding to each control sample, and the distance between any two control samples in the multiple control samples satisfy the following relationship: D=∑(x i -y i ) 2 , Wherein, D is the distance between any two of the sandstone samples, x i is the second chemical weathering index of any one of the plurality of control samples or a plurality of classification function values ​​corresponding thereto, y i is a second chemical weathering index of another of the plurality of control samples or a plurality of classification function values ​​corresponding thereto.

9. The method according to claim 6, characterized in that In step S84, the following steps are also included: S841, determining a relationship diagram between the origins of the plurality of control samples and the relative distances between any two of the plurality of control samples; S842: Determine the distribution areas of the plurality of control samples in the relationship diagram, that is, the relationship between the relative distance of the sandstone and the origin of the sandstone.

10. The method according to claim 9, characterized in that In step S85, the following steps are also included: S851. Determine positions of the plurality of sandstone samples in the relationship graph based on the relative distance between any two of the plurality of sandstone samples and the relationship graph; S852: Determine, based on the positions of the plurality of sandstone samples in the relationship diagram and the distribution areas of the plurality of control samples in the relationship diagram, the control samples that are in the same distribution area in the relationship diagram as the sandstone sample of the to-be-determined origin; S853. Determine the origin of the sample whose origin is to be determined based on the origin of the control sample that is in the same distribution area as the sandstone sample whose origin is to be determined.

11. The method according to claim 4, characterized in that Before step S70, the following steps are also included: S700, correcting the contents of illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer, and illite / montmorillonite mixed layer in the plurality of sandstone samples of the first particle size determined in step S30; In step S71, multiple characteristic values ​​related to the origin of the multiple control samples are determined based on the origin of the multiple control samples, the first chemical weathering index of the multiple control samples, the ratio of SiO2 content to Al2O3 content of the multiple control samples, and the contents of illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer, and illite / montmorillonite mixed layer corrected in step S700.

12. The method according to claim 2, characterized in that In step S51, the following steps are also included: S511, determining that the CaO content in each of the sandstone samples is greater than the Na2O content; S512. Determine the first chemical weathering index of each of the sandstone samples according to the K2O content, Na2O content, and Al2O3 content in each of the sandstone samples.

13. The method according to claim 2, characterized in that In step S51, the following steps are also included: S511′, determining that the CaO content in each of the sandstone samples is less than or equal to the Na2O content; S512′, determining the first chemical weathering index of each of the sandstone samples according to the K 2 O content, Na 2 O content, CaO content, and Al 2 O 3 content in each of the sandstone samples.

14. The method according to claim 2, characterized in that In step S52, the second chemical weathering index of each of the sandstone samples is determined according to the K2O content, Na2O content, CaO content, Fe2O3 content, MgO content and Al2O3 content of each of the sandstone samples.

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