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 plurality of sandstone samples of which the producing areas are to be determined and a plurality of contrast samples of which the producing areas are known, respectively determining illite content, montmorillonite content, chlorite content, kaolinite content, chlorite / montmorillonite mixed layer content, illite / montmorillonite mixed layer content, K2O content, Na2O content, CaO content, Fe2O3 content, MgO content, Al2O3 content and chemical weathering indexes in the plurality of sandstone samples and the plurality of control samples; and according to the contents of the plurality of control samples, the chemical weathering indexes of the plurality of control samples, the contents of the plurality of sandstone samples and the chemical weathering indexes of the plurality of sandstone samples, determining the producing area of each sandstone sample of which the producing area is to be determined. 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 to give a basic understanding of the 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 given in the following to provide a basic understanding of some aspects of the application. It should be understood that this summary is not a comprehensive 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 give some concepts in a simplified form as a prelude to the more detailed description discussed later.

[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 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 K2O, Na2O, CaO, Fe2O3, MgO 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 according to the contents of K2O, Na2O, CaO, Fe2O3, MgO 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 the provenances of the sandstone samples of to-be-determined provenances according to 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 the step S30, the chemical weathering index determined in the step S50, and the contents of illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer and illite / montmorillonite mixed layer and the chemical weathering index in the plurality of control samples of the first particle size determined in the step S60.

[0008] The method provided by the embodiment of the present application can not only effectively determine the provenance of the to-be-determined sandstone sample, but also improve the accuracy of the determined provenance of the sandstone sample, thereby being beneficial to providing reliable and accurate technical support for geological research and resource exploration; meanwhile, by preparing the obtained sandstone sample and the obtained control sample into the sample of the first granularity and the sample of the second granularity, the processing work of the obtained sandstone sample and the obtained control sample can be maximally reduced, the intermediate links are reduced, and the pollution probability of the sample by the intermediate links is reduced, which is beneficial to accurately measuring the above-mentioned content and the chemical weathering index of the sample; and by preparing the obtained sandstone sample and the obtained control sample into the sample of the first granularity and the sample of the second granularity, it is convenient to measure the content of illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer and illite / montmorillonite mixed layer in the obtained sample and the content of K2O, Na2O, CaO, Fe2O3, MgO and Al2O3 in the sample. BRIEF DESCRIPTION OF DRAWINGS

[0009] Other objects and advantages of the present application will become apparent and help to understand the present application by the following description of the embodiments of the present application with reference to the accompanying drawings.

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

[0011] Figure 2 is a relative distance relationship diagram between the control sample and the control sample determined according to the method shown in the figure. Figure 1

[0012] Legend of reference signs:

[0013] 41, first type of sample; 42, second type of sample; 43, third type of sample; 44, fourth type of sample; 45, fifth type of sample.

[0014] It should be noted that the drawings are not necessarily drawn to scale, but are only shown in a schematic manner without affecting the understanding of the reader. DETAILED DESCRIPTION

[0015] ​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 detailed

[0016] It is also to be understood that not all features of a practical implementation are described in the specification. It should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions must be made in order to achieve the developer's specific goals, such as compliance with system- and business-related constraints, which can vary from one implementation to another. Moreover, it should be appreciated that such a development effort might be complex and time-consuming, but would nevertheless be a routine undertaking of design, fabrication, and manufacture for those of ordinary skill in the art having the benefit of this disclosure.

[0017] In the related art, the origin of sandstone is determined by using chemical composition and mineral composition of sandstone, but there is a problem that the origin of sandstone cannot be effectively determined and the determination accuracy is low in the process of determining the origin of sandstone.

[0018] In view of the above problem, embodiments of the present application provide a method for determining the origin of sandstone.

[0019] Reference is made to Figure 1 , Figure 1The method provided by the embodiment of the present application is a flowchart of the method, and the method comprises the following steps: S10, obtaining a plurality of sandstone samples of to-be-determined provenances; 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 K2O, Na2O, CaO, Fe2O3, MgO 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 according to the contents of K2O, Na2O, CaO, Fe2O3, MgO 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 the provenances of the sandstone samples of each to-be-determined provenance according to 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 the step S30, the chemical weathering index determined in the step S50, and the contents of illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer and illite / montmorillonite mixed layer in the plurality of control samples of the first particle size determined in the step S60, and the chemical weathering index.

[0020] The method provided by the embodiments of the present application can not only effectively determine the provenance of the to-be-determined sandstone sample, but also improve the accuracy of the determined provenance of the sandstone sample, thereby being beneficial to providing reliable and accurate technical support for geological research and resource exploration; meanwhile, by preparing the obtained sandstone sample and the sample with known provenance into the sample with the first granularity and the sample with the second granularity, the processing work on the obtained sandstone sample and the obtained sample with known provenance can be maximally reduced, the intermediate links are reduced, and thus the pollution probability of the sample by the intermediate links is reduced, which is beneficial to accurately measuring the above-mentioned contents and the chemical weathering index of the sample; and by preparing the obtained sandstone sample and the sample with known provenance into the sample with the first granularity and the sample with the second granularity, it is convenient to measure the contents of illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer and illite / montmorillonite mixed layer in the obtained sample and the contents of K2O, Na2O, CaO, Fe2O3, MgO and Al2O3 in the sample.

[0021] In some embodiments, the first granularity can be 60-80 mesh, so as to facilitate the measurement of the contents of illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer and illite / montmorillonite mixed layer in the sample with the first granularity. For example, the first granularity can be 70 mesh.

[0022] In some embodiments, the second granularity can be 200 mesh, so as to facilitate the measurement of the contents of K2O, Na2O, CaO, Fe2O3, MgO and Al2O3 in the sample with the second granularity.

[0023] In some embodiments, in the step S20, each sandstone sample can be processed to prepare one sandstone sample with the first granularity and one sandstone sample with the second granularity, that is, the number of sandstone samples with the first granularity and the number of sandstone samples with the second granularity are the same as the number of obtained sandstone samples; in the step S60, the processing on the obtained control sample is the same as above.

[0024] 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.

[0025] In some embodiments, in the step S70, the following steps can also be included: S71, determining the distance between any two of the plurality of sandstone samples according to the illite, smectite, chlorite, kaolinite, chlorite / smectite mixed layer, illite / smectite mixed layer content in the plurality of first particle size sandstone samples determined in the step S30 and the chemical weathering index determined in the step S50; S72, determining the relative distance between any two of the plurality of sandstone samples according to the distance determined in the step S71; S73, determining the relationship between the relative distance of the control samples and the control samples by performing the steps S71-S72 on the control samples; S74, determining the production area of the sample to be determined according to the relative distance between any two of the sandstone samples to be determined and the relationship determined in the step S73. In such embodiments, the production area of the sample to be determined is determined according to the relative distance between any two of the sandstone samples to be determined and the relationship determined in the step S73, which can avoid errors caused by the foregoing operations and facilitate accurate determination of the production area of the sandstone sample to be determined.

[0026] In some embodiments, in the step S72, the following steps can also be included: S721, determining the maximum distance in the distance determined in the step S71; S722, determining the relative distance corresponding to the maximum distance determined in the step S721; S723, determining the proportion between all distances in the distance determined in the step S71 and the maximum distance; S724, determining the relative distance between any two of the plurality of sandstone samples according to the relative distance determined in the step S722 and the proportion determined in the step S723. In such embodiments, the distance between any two of the plurality of sandstone samples can be converted into the relative distance between any two of the plurality of sandstone samples through the foregoing steps, which can reduce the difficulty in determining the relationship between the relative distance of the sample of the known production area and the sample of the known production area and facilitate improvement of the efficiency of determining the production area of the sandstone sample to be determined.

[0027] In some embodiments, in the step S722, the relative distance corresponding to the maximum distance determined in the step S721 can be set as the horizontal printing size of standard A4 paper. Preferably, the relative distance corresponding to the maximum distance determined in the step S721 can be set as 25 to reduce the amount of calculation in determining the relative distance between any two of the plurality of sandstone samples.

[0028] 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:

[0029]

[0030] 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, 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.

[0031] In some embodiments, in the step S71, the illite, smectite, chlorite, kaolinite, chlorite / smectite mixed layer, illite / smectite mixed layer content of any one of the plurality of first-granularity sandstone samples determined in the step S30, the chemical weathering index determined in the step S50, and the distance between any two of the plurality of sandstone samples satisfy the following relationship:

[0032] D =∑(x i -y i ) 2 ,

[0033] wherein D is the distance between any two of the plurality of sandstone samples, x i is the illite, smectite, chlorite, kaolinite, chlorite / smectite mixed layer, illite / smectite mixed layer content, or chemical weathering index of any one of the plurality of first-granularity sandstone samples, and y i is the illite, smectite, chlorite, kaolinite, chlorite / smectite mixed layer, illite / smectite mixed layer content, or chemical weathering index of another one of the plurality of first-granularity sandstone samples. 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 to be determined.

[0034] In some embodiments, in the step S73, the following steps can also be included: S731, determining a relationship graph between the control samples and the relative distances of the control samples; S732, determining a distribution area of the control samples in the relationship graph. In such embodiments, by determining the relationship graph, the distribution rule of the control samples can be intuitively displayed and determined through the relationship graph, and then the origin of the sample to be determined can be determined through the distribution rule of the control samples.

[0035] In some embodiments, in the step S731, the control samples can be taken as the vertical direction of the classification graph, and the relative distances between any two samples in the control samples can be taken as the horizontal direction of the classification graph, and the samples belonging to the same origin are connected to obtain the relationship graph.

[0036] In some embodiments, in the step S732, the origin classification distance can be determined according to the number of origins of the control samples and the maximum relative distance, and then 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 then the origin classification distance can be 10.

[0037] In some embodiments, in the step S74, the following steps can also be included: S741, determining the position of the sandstone sample of the origin to be determined in the relationship graph according to the relative distance between any two sandstone samples of the sandstone sample of the origin to be determined and the relationship graph; S742, determining the control samples in the same distribution area as the sandstone sample of the origin to be determined in the relationship graph according to the position of the sandstone sample of the origin to be determined in the relationship graph and the distribution area of the control samples in the relationship graph; S743, determining the origin of the sample to be determined according to the origin of the control sample in the same distribution area as the sandstone sample of the origin to be determined. 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 sample of the origin to be determined can be determined according to the distribution of the sandstone sample of the origin to be determined in the relationship graph and the distribution of the control samples in the relationship graph, so that the origin of the sandstone sample of the origin to be determined can be determined according to the origin of the control sample, which is beneficial to intuitively and efficiently determining the origin of the sandstone sample of the origin to be determined.

[0038] In some embodiments, before step S70, the method further includes: 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, determining the distance between any two sandstone samples in the plurality of sandstone samples based on the corrected contents of illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer, and illite / montmorillonite mixed layer in step S700 and the chemical weathering index determined in step S50. In such an embodiment, the contents of illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer, and illite / montmorillonite mixed layer in multiple sandstone samples of the first particle size are first corrected, and then the distance between any two sandstone samples among the multiple sandstone samples is determined based on the corrected contents of illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer, and illite / montmorillonite mixed layer. This can reduce the complexity of the process of determining the distance between any two sandstone samples among the multiple sandstone samples and simplify the operation of determining the distance between any two sandstone samples among the multiple sandstone samples.

[0039] In some embodiments, in step S700, the measured contents of illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer, and illite / montmorillonite mixed layer in multiple sandstone samples of the first particle size are multiplied by 100 to obtain corrected contents of illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer, and illite / montmorillonite mixed layer.

[0040] In some embodiments, step S40 may further include the following steps: S41, pre-treating multiple sandstone samples of the second particle size; S42, digesting the pre-treated multiple sandstone samples of the second particle size; and S43, determining the contents of different chemical components in the digested multiple sandstone samples of the second particle size. In such an embodiment, pre-treating the multiple sandstone samples of the second particle size can remove calcite crystals in the multiple sandstone samples of the second particle size, thereby preventing the calcite crystals from affecting the measurement of the contents of K2O, Na2O, CaO, Fe2O3, MgO, and Al2O3. Simultaneously, digesting the pre-treated multiple sandstone samples of the second particle size allows for the measurement of the contents of K2O, Na2O, CaO, Fe2O3, MgO, and Al2O3.

[0041] In some embodiments, in the step S41, the plurality of sandstone samples of the second particle size can be pretreated by using dilute hydrochloric acid. In such embodiments, the plurality of sandstone samples of the second particle size are pretreated by using dilute hydrochloric acid, which can remove calcite crystals in the plurality of sandstone samples of the second particle size, while avoiding affecting the measurement of the contents of K2O, Na2O, CaO, Fe2O3, MgO, and Al2O3 in the plurality of second particle size, and is conducive to ensuring the accuracy of the measured contents of K2O, Na2O, CaO, Fe2O3, MgO, and Al2O3.

[0042] In some embodiments, in the step S42, the plurality of pretreated sandstone samples of the second particle size can be digested by using a mixed acid composed of HNO3-HF-HClO4. In such embodiments, the plurality of pretreated sandstone samples of the second particle size are digested by using the plurality of pretreated sandstone samples of the second particle size, which can ensure the high purity of the reagents used for digestion, avoid the introduction of impurities in the digestion process, and thus avoid affecting the accuracy of the measured contents of K2O, Na2O, CaO, Fe2O3, MgO, and Al2O3.

[0043] In some embodiments, in the step S50, the following steps can also be included: S51, determining that the content of CaO is greater than the content of Na2O; and S52, determining the chemical weathering index of the plurality of sandstone samples of the second particle size according to the contents of K2O, Na2O, Fe2O3, MgO, and Al2O3. During the digestion process, CaO and Na2O can interfere with each other, resulting in inaccurate measured contents of CaO or Na2O. The embodiments of the present application can avoid the influence of the inaccurate measured content of CaO on the determined chemical weathering index by determining that the content of CaO is greater than the content of Na2O and determining the chemical weathering index according to the contents of K2O, Na2O, Fe2O3, MgO, and Al2O3, so as to ensure the accuracy of the determined chemical weathering index.

[0044] In some embodiments, the chemical weathering index, the contents of K2O, Na2O, Fe2O3, MgO, and Al2O3 of the plurality of sandstone samples of the second particle size satisfy the following relationship:

[0045] Z = 2 x (K2O + 2Na2O + Fe2O3 + MgO) / Al2O3,

[0046] In the formula, Z represents the chemical weathering index of the plurality of sandstone samples of the second particle size, K2O represents the K2O content, Na2O represents the Na2O content, Fe2O3 represents the Fe2O3 content, MgO represents the MgO 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.

[0047] In some embodiments, in the step S50, the following steps can also be included: S51', determining that the CaO content is less than or equal to the Na2O content; and S52', determining the chemical weathering index of the plurality of sandstone samples of the second particle size according to the K2O content, the Na2O content, the CaO content, the Fe2O3 content, the MgO content, and the Al2O3 content. During the digestion process, CaO and Na2O interfere with each other, resulting in inaccurate measured CaO content or Na2O content. In the embodiments of the present application, 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, the Fe2O3 content, the MgO content, and the Al2O3 content, the influence on the determined chemical weathering index can be avoided, so as to ensure the accuracy of the determined chemical weathering index.

[0048] In some embodiments, the 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:

[0049] Z = 2 × (K2O + Na2O + CaO + Fe2O3 + MgO) / Al2O3,

[0050] In the formula, Z represents the chemical weathering index of the plurality of sandstone samples of the second particle size, K2O represents the K2O content, Na2O represents the Na2O content, CaO represents the CaO content, Fe2O3 represents the Fe2O3 content, MgO represents the MgO 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.

[0051] 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 content of illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer, and illite / montmorillonite mixed layer in the plurality of tablet samples, and taking the average of the plurality of repeated measurements as the content of illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer, and illite / montmorillonite mixed layer 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 content of illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer, and illite / montmorillonite mixed layer; and repeatedly measuring the tablet samples and taking the average of the plurality of repeated measurements as the content of illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer, and illite / montmorillonite mixed layer in the plurality of sandstone samples of the first granularity can avoid accidental errors in measurement, and also facilitate accurate measurement of the content of illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer, and illite / montmorillonite mixed layer.

[0052] 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.

[0053] Embodiments of the present application facilitate ensuring that the internal structure of the tablet samples obtained by constant pressure pressing of the sandstone samples of the first granularity is uniform, and facilitate accurate measurement of the content of illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer, and illite / montmorillonite mixed layer.

[0054] In some embodiments, in the step S32, X-ray can be used to measure the content of illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer, and illite / montmorillonite mixed layer 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.

[0055] 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 content of illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer, and illite / montmorillonite mixed layer in the sandstone sample of the first granularity. For example, each tablet sample can be measured 5 times.

[0056] 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.

[0057] 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 17 samples of known origin are Cretaceous sandstone samples, and the 17 samples are respectively from the Songliao Basin, the Eren Basin and the Ordos Basin. Specifically, 5 samples are from the Songliao Basin, 4 samples are from the Eren Basin, and 8 samples are from the Ordos Basin.

[0058] (1) First, the above-mentioned 17 samples are respectively made into 17 70-mesh samples and 17 200-mesh samples according to 70 mesh and 200 mesh; then, the 17 70-mesh samples 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 17 tablet samples by using a tablet press under a pressure of 20 tons for 1 minute.

[0059] (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 17 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 70-mesh sample.

[0060] (3) The 17 200 mesh samples were pretreated with dilute hydrochloric acid, and after the pretreatment, the 17 pretreated 200 mesh samples were digested with HNO3-HF-HClO4, and the K2O, Na2O, CaO, Fe2O3, MgO, and Al2O3 contents in the 17 digested 200 mesh samples were measured; then, according to the measured K2O, Na2O, CaO, Fe2O3, MgO, and Al2O3 contents in the 17 200 mesh samples, the chemical weathering index of each 200 mesh sample was determined.

[0061] Referring to Table 1 below, the illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer, and illite / montmorillonite mixed layer contents in the 17 70 mesh samples and the chemical weathering index of the 17 200 mesh samples are shown in Table 1 below.

[0062] Table 1 Contents and chemical weathering index in the 17 samples

[0063]

[0064]

[0065] (4) The illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer, and illite / montmorillonite mixed layer contents in the 17 70 mesh samples were multiplied by 100 for correction; then, according to the corrected illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer, and illite / montmorillonite mixed layer contents and the chemical weathering index of the 17 200 mesh samples, the distance between any two samples in the 17 samples was calculated.

[0066] Referring to Table 2 and Table 3 below, the distance between any two samples in the 17 samples is shown in Table 2 and Table 3 below.

[0067] Table 2 Distance between any two samples in the 17 samples

[0068]

[0069]

[0070] Table 3 Distance between any two samples in the 17 samples

[0071]

[0072]

[0073] (5) The 289 values of the distance D between the 17 samples were sorted in size, and the maximum distance D max9994.04 is converted into the maximum relative distance 25, and the distances between the other two samples are converted into the corresponding relative distances according to the proportion of the distance to the maximum distance.

[0074] (6) According to the relative distance between the 17 samples and the 17 samples, the classification graph is determined, see Figure 2 , Figure 2 is determined according to the method shown in the figure Figure 1 The relative distance between the control samples and the control samples is determined according to the method shown in the figure Figure 2 The 17 samples in the figure are from 3 producing areas, and the producing area classification distance is set to 10. From Figure 2 It can be seen from the figure that the classification graph is cut off at the relative distance of 10, and the sandstone samples are divided into three categories, the first category sample 41 contains 4 samples of the Erenhot Basin; the second category sample 42 contains 5 samples of the Songliao Basin; the third category sample 43 contains 8 samples of the Ordos Basin. With the increase of the relative distance, the second category sample 42 and the third category sample 43 are combined into the fourth category sample 44 at the relative distance of 15, and finally combined into the fifth category sample 45 with the first category sample 41 at the relative distance of 25.

[0075] (7) Obtain a plurality of (for example, 17) sandstone samples, perform steps (1)-(5) on the obtained plurality of sandstone samples, and determine the position of each sandstone sample in the classification graph according to the relative distance between any two sandstone samples in the plurality of sandstone samples., and further determine the producing area of each sandstone sample.

[0076] 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.

[0077] 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 K2O, Na2O, CaO, Fe2O3, MgO, 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 according to the contents of K2O, Na2O, CaO, Fe2O3, MgO and Al2O3 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-S50 on the plurality of control samples; S70. Determine the origin of each sandstone sample to be determined based on the contents of illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer, and illite / montmorillonite mixed layer in the multiple sandstone samples of the first particle size determined in step S30 and the chemical weathering index determined in step S50, as well as the contents of illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer, and illite / montmorillonite mixed layer and the chemical weathering index in the multiple control samples of the first particle size determined in step S60.

2. The method according to claim 1, characterized in that In step S70, the following steps are also included: S71. Determine the distance between any two of the plurality of sandstone samples based on 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 and the chemical weathering index determined in step S50; S72. Determine the relative distance between any two of the sandstone samples according to the distance determined in step S71; S73, performing steps S71-S72 on the control sample to determine the relationship between the relative distance of the control sample and the control sample; S74. Determine the origin of the sample whose origin is to be determined based on the relative distance between any two of the sandstone samples whose origin is to be determined and the relationship determined in step S73.

3. The method according to claim 2, characterized in that In step S72, the following steps are also included: S721, determining the maximum distance among the distances determined in step S71; S722. Determine a maximum relative distance corresponding to the maximum distance determined in step S721; S723, determining a ratio between all the distances determined in step S71 and the maximum distance; S724. Determine the relative distance between any two of the sandstone samples according to the maximum relative distance determined in step S722 and the ratio determined in step S723.

4. The method according to claim 2, characterized in that In step S71, 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, the chemical weathering index determined in step S50, and the distance between any two of the plurality of sandstone 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 illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer, illite / montmorillonite mixed layer content or the chemical weathering index of any one of the plurality of sandstone samples of the first particle size, i The illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer, illite / montmorillonite mixed layer content or the chemical weathering index of another sandstone sample among the multiple sandstone samples of the first particle size.

5. The method according to claim 2, characterized in that In step S73, the following steps are also included: S731, determining a relationship diagram between the relative distances between the control sample and the reference sample; S732. Determine the distribution area of ​​the control sample in the relationship diagram.

6. The method according to claim 5, characterized in that In step S74, the following steps are also included: S741. Determine the position of the sandstone sample of the to-be-determined origin in the relationship graph based on the relative distance between any two of the sandstone samples of the to-be-determined origin and the relationship graph; S742. Determine, based on the position of the sandstone sample of the to-be-determined origin in the relationship diagram and the distribution area of ​​the control samples in the relationship diagram, the control samples that are in the same distribution area as the sandstone sample of the to-be-determined origin in the relationship diagram; S743. 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.

7. The method according to claim 2, 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, the distance between any two of the sandstone samples is determined based on the contents of illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer, and illite / montmorillonite mixed layer corrected in step S700 and the chemical weathering index determined in step S50.

8. The method according to claim 7, characterized in that In step S50, the following steps are also included: S51, determining that the CaO content is greater than the Na2O content; S52. Determine the chemical weathering index of the plurality of sandstone samples of the second particle size according to the K2O content, the Na2O content, the Fe2O3 content, the MgO content, and the Al2O3 content.

9. The method according to claim 7, characterized in that In step S50, the following steps are also included: S51', determining that the CaO content is less than or equal to the Na2O content; S52', determining the chemical weathering index of the plurality of sandstone samples of the second particle size according to the K2O content, the Na2O content, the CaO content, the Fe2O3 content, the MgO content, and the Al2O3 content.

10. The method according to claim 1, characterized in that In step S40, the following steps are also included: S41, pre-processing the plurality of sandstone samples of the second particle size; S42, digesting the plurality of pre-treated sandstone samples of the second particle size; S43: Determine the contents of different chemical components in the plurality of sandstone samples of the second particle size after digestion.

11. The method according to claim 10, characterized in that In step S41 , the plurality of sandstone samples of the second particle size are pretreated using dilute hydrochloric acid.

12. The method according to claim 1, characterized in that In step S30, the following steps are also included: S31, pressing the plurality of sandstone samples of the first particle size into a plurality of pressed tablet samples; S32. Repeatedly measure the contents of illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer, and illite / montmorillonite mixed layer in the multiple pressed samples, and take the average value of the multiple repeated measurements as the contents of illite, montmorillonite, chlorite, kaolinite, chlorite / montmorillonite mixed layer, and illite / montmorillonite mixed layer in the multiple sandstone samples of the first particle size.

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