CN110794115A - Quantitative characterization method of biological quartz of fine-grained sedimentary rock - Google Patents
Quantitative characterization method of biological quartz of fine-grained sedimentary rock Download PDFInfo
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Abstract
The application provides a quantitative characterization method of fine sedimentary rock biogenetic quartz, and belongs to the field of shale oil-gas exploration and development. The quantitative characterization method of the biological quartz of the fine-grained sedimentary rock comprises the following steps: and (4) representing the total content of the silicon element in the quartz by the balance of the total amount of the silicon element in the rock stratum excluding the silicon element contained in the feldspar and the clay mineral. The quantitative characterization method combines the geochemistry to calculate the quartz of the biological cause by the characterization of the silicon content, and the silicon content of the biological quartz is determined to carry out quantitative characterization by removing the silicon content of the quartz except the biological cause from the total silicon content of the quartz. The characterization research of the total silicon content of the quartz finds that the feldspar and the clay mineral have large influence on the silicon content, and the silicon content of the feldspar and the clay mineral is discharged according to the actually measured total silicon content to obtain more accurate total silicon content of the quartz, so that more accurate quantitative characterization results of the biological quartz are obtained.
Description
Technical Field
The application relates to the field of shale oil-gas exploration and development, in particular to a quantitative characterization method for biological quartz of fine sedimentary rock.
Background
Sedimentary rocks composed of fine-grained sediments are called fine-grained sedimentary or argillaceous rocks, of which the shale is developed in a shale manner. Quartz is one of the most predominant and important minerals in the main component of fine-grained sedimentary rock, on the one hand, quartz is abundant; on the other hand, quartz affects the fracturing property of shale, and the content of quartz is in direct proportion to the fracturing property, which directly affects the development benefit of shale oil and gas.
The cause types of quartz are abundant. The land-source quartz particles are often angular or irregular and are easy to identify under a mirror, and the quartz is traditionally considered as a land-source cause. Along with the exploration studies of unconventional shale oil and gas, biogenic quartz was shown to be present in the octoceramic series quincunt group-the minthon series dragon creek group, the eastern mud pot series shale, Barnett shale, Woodford shale, and Marcellus shale in china.
Most of the biological quartz is cryptocrystal, the particle size is fine, the cathodoluminescence is weak luminescence-no luminescence, and the wavelength is near 620nm, so that the peak value appears. At present, most of the biological quartz is subjected to qualitative research, and the form, the cathodoluminescence, the spectral characteristics and the like of the biological quartz are analyzed. However, qualitative biocrystallite research cannot meet the requirements of scientific research and shale gas exploration and development. The content of the biological quartz needs to be calculated quantitatively. However, methods for quantitative characterization are currently lacking.
Disclosure of Invention
The application aims to provide a quantitative characterization method for the biogenetic quartz of the fine sedimentary rock, which can realize relatively accurate quantitative analysis on the content of the biogenetic quartz in the fine sedimentary rock.
The embodiment of the application is realized as follows:
the embodiment of the application provides a quantitative characterization method of fine-grained sedimentary rock biogenetic quartz, which comprises the following steps: and (4) representing the total content of the silicon element in the quartz by the balance of the total amount of the silicon element in the rock stratum excluding the silicon element contained in the feldspar and the clay mineral.
In the technical scheme, the inventor finds that in the process of implementing the application, the silicon element content of quartz other than biological quartz in the quartz contained in the fine-grained sedimentary rock can be characterized by combining a geochemical quantitative method, so that the biological quartz in the fine-grained sedimentary rock can be quantitatively characterized as long as the total silicon element content of the quartz contained in the fine-grained sedimentary rock is determined. The inventor also finds that the content of silicon element in the deposition of the fine grains can be conveniently and accurately measured, and the terrestrial-origin quartz is mostly cooperated with feldspar and clay minerals which are minerals with high silicon content in the deposition process accompanied by deposition processes such as erosion, weathering, transportation and the like. Therefore, in quantitative characterization, the residual quantity after the silicon element contained in the feldspar and the clay mineral is discharged according to the total content of the silicon element in the fine-grained sedimentary rock is used for characterizing the total silicon element content of the quartz, so that more accurate total silicon element content of the quartz can be obtained, more accurate silicon content of the biological quartz is obtained through characterization, and more accurate content of the biological quartz is obtained through further characterization.
In some optional embodiments, the content of silicon element in the feldspar is characterized by the product of the total content of the feldspar and the first content percentage; wherein the first content percentage is determined by the mass percentage of silicon element in albite and the mass percentage of silicon element in anorthite.
In the technical scheme, the content of the feldspar is conveniently and accurately measured, and the silicon content of the feldspar in the fine-grained sedimentary rock is represented by the product of the actually measured feldspar content and the average content of silicon elements of the feldspar. Meanwhile, researches find that main silicon-containing substances in the feldspar of the fine-grained sedimentary rock are albite and anorthite, so when the average content of silicon elements in the feldspar is determined by using the albite and the anorthite, the determination of the average content of the silicon elements in the feldspar and subsequent data processing are facilitated while the characterization result is ensured to have better accuracy.
In some alternative embodiments, the first content percentage is an average of the mass percentage of silicon element in albite to the mass percentage of silicon element in anorthite.
In the technical scheme, the inventor researches and discovers that the first content percentage is directly determined by the average value of the silicon contents of the two components, other measurement analysis of albite and anorthite is not needed, the first content percentage is convenient to determine, and the first content percentage obtained by the method is proved to have better accuracy through research.
In some optional embodiments, the percentage by mass of silicon element in albite is 32% and the percentage by mass of silicon element in anorthite is 19%.
In the technical scheme, researches find that the influence of factors which may cause the increase of the silicon element content or the decrease of the silicon element content in each feldspar of the fine-grained sedimentary rock on the silicon element content can be counteracted to a certain extent, and albite and anorthite directly determine the respective silicon element content according to the chemical formula, so that the determination of the silicon element content is convenient, and the influence on the final quantitative characterization is small.
In some alternative embodiments, the elemental silicon content of the clay mineral is characterized by the product of the measured total clay mineral content and a second percentage of the clay mineral content; wherein the second content percentage is determined by the mass percentage of silicon element in illite, the mass percentage of silicon element in montmorillonite, the mass percentage of silicon element in chlorite and the mass percentage of silicon element in kaolinite.
In the technical scheme, the content of the clay mineral is conveniently and accurately measured, and the silicon content of the clay mineral in the fine-grained sedimentary rock is characterized by the product of the measured average content of silicon elements of the clay mineral and the clay mineral. Meanwhile, researches find that main silicon-containing substances in the clay minerals of the fine sedimentary rocks are illite, montmorillonite, chlorite and kaolin, so when the illite, the montmorillonite, the chlorite and the kaolin are used for determining the average content of silicon elements of the clay minerals, the determination of the average content of the silicon elements of the clay minerals and subsequent data processing are facilitated while the characterization results are guaranteed to be better accurate.
In some alternative embodiments, the second percentage content is an average of the percentage by mass of silicon in illite, the percentage by mass of silicon in montmorillonite, the percentage by mass of silicon in chlorite, and the percentage by mass of silicon in kaolinite.
In the above technical solution, the inventors have found that the second content percentage is determined directly from the average value of the silicon content of the four compounds, and other measurement and analysis of illite, montmorillonite, chlorite and kaolin are not required, so that the second content percentage is easily determined, and the second content percentage obtained by the method has better accuracy.
In some alternative embodiments, the illite has a silicon content of 21.7% by weight, the montmorillonite has a silicon content of 21.7% by weight, the chlorite has a silicon content of 21.1% by weight, and the kaolinite has a silicon content of 31.1% by weight.
In the above technical scheme, research finds that the influence of factors which may cause the increase or decrease of the content of the silicon element in each clay mineral of the fine grained sedimentary rock on the content of the silicon element can be counteracted to a certain extent, and the illite, the montmorillonite, the chlorite and the kaolin directly determine the content of each silicon element according to the chemical formula without crystal water, so that the content of the silicon element is determined conveniently and the influence on the final quantitative characterization is small.
In some alternative embodiments, a method for quantitative characterization of fine grained sedimentary rock biogenetic quartz, further comprising: and (4) representing the content of the silicon element in the biogenic quartz by using the residual quantity after the silicon element in the land source rock-finished quartz is removed from the total content of the silicon element in the quartz.
In the above technical scheme, research finds that the quartz in the fine-grained sedimentary rock mainly comprises three types, namely, terrestrial-origin-cause quartz, diagenetic-cause quartz and biogenetic quartz, so that when the silicon element content of the biogenetic quartz in the fine-grained sedimentary rock is represented by the total silicon element content in the quartz, the silicon element content of the terrestrial-origin-cause quartz needs to be removed, and the silicon element content of the diagenetic-cause quartz needs to be removed, so that the quantitative representation of the biogenetic quartz is more accurate. The total silicon content of the quartz of the land origin and the quartz of the diagenetic origin in the fine sedimentary rock can be conveniently and quantitatively characterized by a geochemical quantitative method.
In some alternative embodiments, the elemental silicon content in the land-source rock-forming british is characterized by the product of the measured elemental aluminum content of the land-source cause and a first scaling factor; wherein the first scaling factor has a value of 3.11.
In the technical scheme, the inventor researches and discovers that the content of the total silicon element of the quartz of the land source cause and the quartz of the diagenetic cause in the fine-grained sedimentary rock is approximately in a coefficient ratio of 3.11 with the content of the aluminum element of the land source cause in the fine-grained sedimentary rock, the quantitative characterization of the content of the aluminum element of the land source cause in the fine-grained sedimentary rock is relatively simple and accurate, and therefore, the method is convenient and high in accuracy by using the content of the aluminum element of the land source cause multiplied by the coefficient of proportion of 3.11 to characterize the content of the total silicon element of the quartz of the land source cause and the quartz of the diagenetic cause.
In some alternative embodiments, a method for quantitative characterization of fine grained sedimentary rock biogenetic quartz, further comprising: calibrating the calculated value according to the total quartz content obtained by actual measurement; the calibrated content of biogenic quartz is characterized by the product of the content of biogenic quartz and the second proportionality coefficient; wherein, the second proportionality coefficient is the ratio of the total quartz content obtained by actual measurement to the calculated value of the total quartz content.
In the above technical solution, research finds that the silicon content of the quartz of the biological cause obtained by the characterization by the calculation method can mainly represent the proportion of the quartz in the total silicon element in the fine-grained sedimentary rock more accurately, and a more accurate result of the quantitative characterization of the quartz of the biological cause in the fine-grained sedimentary rock can be obtained by actually measuring the total quartz content in the fine-grained sedimentary rock, comparing the actual measurement value of the total quartz content with the calculated value of the total quartz content to obtain a correction coefficient, and multiplying the correction coefficient by the calculated quartz content of the biological cause to correct.
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In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
FIG. 1 is a schematic flow chart of a method for quantitatively characterizing fine-grained sedimentary rock biogenetic quartz provided by an embodiment of the application;
FIG. 2 is a histogram of the biological quartz and components obtained by quantitative characterization in the experimental examples of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The detection method of the used data is not noted, and the detection method and the equipment used for detection are carried out according to the current industry standard.
The following is a detailed description of the method for quantitatively characterizing biogenetic quartz of fine-grained sedimentary rock according to the examples of the present application.
Referring to fig. 1, an exemplary embodiment of the present application provides a method for quantitatively characterizing fine-grained sedimentary rock biogenetic quartz, which mainly includes the following steps:
and a, representing the total content of the silicon element in the quartz by using the allowance after the total amount of the silicon element in the rock stratum excludes the silicon element contained in the feldspar and the clay mineral.
In the step a, the total silicon element content in the rock stratum refers to the total mass percentage of silicon in the fine-grained sedimentary rock, and is abbreviated as Si belowGeneral assemblyWhich can be obtained by quantitative characterization. The silicon element contained in the feldspar refers to the mass percentage of the silicon contained in the feldspar in the fine-grained sedimentary rock, and is hereinafter referred to as SiFeldspar. The silicon element contained in the clay mineral refers to the mass percentage of silicon contained in the clay mineral in the fine-grained sedimentary rock, and is hereinafter referred to as SiClay mineral. The total content of silicon element in the quartz refers to the mass percentage content of the total silicon content in the quartz in the fine-grained sedimentary rock, and is hereinafter referred to as SiQuartz assembly。
In the step a, the step (c),Siquartz assemblyThe calculation can be performed by the formula shown in formula (1).
Formula (1) SiQuartz assembly＝SiGeneral assembly-SiFeldspar-SiClay mineral
Since the total content of feldspar in the fine sedimentary rock is represented by mass percentage, hereinafter referred to as WFeldsparWhich can be obtained by quantitative characterization. Therefore, if the average content of silicon element in feldspar in the fine sedimentary rock, hereinafter referred to as the first content percentage, is obtained, Si can be obtainedFeldspar。
It has been found that the predominant siliceous species in feldspar of fine grained sedimentary rocks are albite and anorthite, and in some alternative embodiments the first percentage content is determined by the mass percentage of elemental silicon in albite to the mass percentage of elemental silicon in anorthite.
Illustratively, the first content percentage is an average of the mass percentage of silicon element in albite and the mass percentage of silicon element in anorthite.
The above method is characterized in that the mass ratio of albite to anorthite is 1: 1. In other embodiments, the ratio of the silicon content of albite to the silicon content of anorthite can be adjusted according to the geological differences of different exploration areas, for example, the first content percentage is characterized according to the mass ratio of albite to anorthite of 4:5, 4:6, 5:4, 6:4 and the like.
In order to facilitate the determination of the mass percent of silicon element in albite and the mass percent of silicon element in anorthite, each feldspar in the fine-grained sedimentary rock cannot be a pure compound, and may have some influence factors which cause the silicon content of each feldspar to be increased or some influence factors which cause the silicon content of each feldspar to be reduced, and the factors which increase the silicon content and the factors which reduce the silicon content can be offset to a certain extent.
Thus in some alternative embodiments albite is directly in its Na2O·Al2O3·6SiO2The chemical formula (c) determines the mass percentage of silicon element thereof, and finally determines the mass percentage to be 32%. The anorthite is directly added with CaO and Al2O3·2SiO2The chemical formula (c) of (d) determined the mass percentage of its silicon element, and finally determined the mass percentage to be 19%.
In other embodiments, the mass percentage of the silicon element in each of albite and anorthite may be adjusted according to actual exploration conditions, for example, multiplied by appropriate correction factors such as 0.9, 0.95, 1.05, 1.1, etc.
According to the above method, in some alternative embodiments, SiFeldsparThe calculation can be performed by the formula shown in formula (2).
Formula (2) SiFeldspar＝WFeldspar*[(0.32+0.19)/2]
Similarly, the total content of clay minerals in the fine sedimentary rock is expressed as a mass percentage, hereinafter referred to as WClay mineralWhich can be obtained by quantitative characterization. Therefore, if the average content of silicon element of the clay mineral in the fine sedimentary rock, hereinafter referred to as the second content percentage, is obtained, Si can be obtainedClay mineral。
It has been found that the clay minerals of fine grained sedimentary rocks are primarily composed of illite, montmorillonite, chlorite, and kaolin, and in some alternative embodiments, the second percentage content is determined collectively by the mass percentage of silicon in illite, the mass percentage of silicon in montmorillonite, the mass percentage of silicon in chlorite, and the mass percentage of silicon in kaolin.
Illustratively, the second percentage content is an average of the mass percent of silicon in illite, the mass percent of silicon in montmorillonite, the mass percent of silicon in chlorite, and the mass percent of silicon in kaolinite.
The above method was characterized in the case where the mass ratio of the various clay minerals was 1: 1. In other embodiments, the ratio of the silicon content of the clay minerals in the above-mentioned individual areas can be adjusted according to actual exploration conditions according to geological differences of different exploration areas, for example, the second content percentage is characterized according to the mass ratio of any two clay minerals of 4:5, 4:6, 5:4, 6:4 and the like.
In order to facilitate the determination of the mass percent of silicon element in illite, the mass percent of silicon element in montmorillonite, the mass percent of silicon element in chlorite and the mass percent of silicon element in kaolinite, since each clay mineral existing in the fine-grained sedimentary rock cannot be a pure compound, there may be some influencing factors which cause the silicon content of each clay mineral to increase, and there may also be some influencing factors which cause the silicon content of each feldspar to decrease, and the factors which increase the silicon content and decrease the silicon content can be offset to some extent, it is found that the influence on the silicon content of each clay mineral existing in the fine-grained sedimentary rock is not great.
Thus in some alternative embodiments, illite KAl2[(OH)2AlSi3O10]The mass percentage of silicon element thereof was determined directly in the form of the chemical formula thereof, and finally determined to be 21.7%. Montmorillonite directly uses Al thereof4Si8O20(OH)4The chemical formula (c) of (d) determined the mass percentage of silicon element thereof, and finally determined the mass percentage to be 21.7%. Chlorite is directly added with Al4Si4O10(OH)8The chemical formula (c) of (d) determined the mass percentage of silicon element thereof, and finally determined the mass percentage to be 21.1%. Kaolinite Al2(Si2O5)(OH)4The mass percentage of silicon element thereof was determined directly in the form of the chemical formula thereof, and finally determined to be 31.1%.
In other embodiments, the mass percentage of the silicon element of each of the various clay minerals may be adjusted as appropriate according to the actual survey, for example, multiplied by appropriate correction factors such as 0.9, 0.95, 1.05, 1.1, etc.
According to the above method, in some alternative embodiments, SiFeldsparThe calculation can be performed by the formula shown in formula (3).
Formula (3) SiClay mineral＝WClay clayMineral substance*[(0.217+0.217+0.211+0.311)/4]
Since the quartz in the fine-grained sedimentary rock contains, in addition to biogenic quartz, for example, of terrestrial origin, the quantitative characterization of the percentage by mass of silicon contained in biogenic quartz in the fine-grained sedimentary rock is to be carried out, hereinafter referred to as Si for shortBiological quartzThe silicon content of quartz, excluding other causes, is also required for quantitative characterization of (a).
The quartz mainly comprises three types of terrestrial origin cause quartz, diagenetic cause quartz and biogenetic cause quartz. Thus in some alternative embodiments, the quantitative characterization method further comprises the steps of:
step b. with SiQuartz assemblyThe mass percentage of silicon contained in the fine-grained sedimentary rock excluding the land-source origin cause quartz and the diagenetic cause quartz is hereinafter referred to as Si excludingLand source-diagenetic quartz。
In step b, SiBiological quartzThe calculation can be performed by the formula shown in formula (4).
Formula (4) SiBiological quartz＝SiQuartz assembly-SiLand source-diagenetic quartz
SiLand source-diagenetic quartzFrom a geochemical perspective, any quantitative characterization of Si can be usedLand source-diagenetic quartzThe method of (1) quantitatively characterizes it. The research shows that the content of aluminum element of the continental origin cause is called Al for shortLand sourceConvenient and accurate quantitative detection, and SiLand source-diagenetic quartzWith AlLand sourceThe ratio therebetween is approximately 3.11, and this coefficient of 3.11 will be referred to as the first ratio coefficient hereinafter.
Thus, in some alternative embodiments, SiLand source-diagenetic quartzAl obtained by actual measurementLand sourceCharacterised by the product with a first proportionality coefficient, SiLand source-diagenetic quartzThe calculation can be performed by the formula shown in formula (5).
Formula (5) SiLand source-diagenetic quartz＝3.11*AlLand source
In the quantitative characterization of the biogenetic quartz of the fine-grained sedimentary rock, the disclosure of step a and step b is provided by the above examplesEquation (1-5), Si can be calculatedBiological quartz. The relative molecular mass of quartz is 60, the relative atomic mass of silicon is 28, and the mass percent of biogenic quartz in fine grained sedimentary rocks, hereinafter referred to as WBiological quartz，WBiological quartzSi can be obtained by reacting with silicon content of the biogenic quartzBiological quartzThus WBiological quartzThe quantitative characterization of the biogenic quartz in the fine-grained sedimentary rock can be realized by calculating according to the formula shown in the formula (6).
Formula (6) WBiological quartz ═ biological quartzSiBiological quartz*60/28
The study found that W was characterized by computational methodsBiological quartzThe proportion of the quartz in the total quartz in the fine-grained sedimentary rock can be reflected relatively accurately, and the more accurate quantitative characterization result of the quartz of the biological cause in the fine-grained sedimentary rock can be obtained by correcting the actual measurement of the total quartz content in the fine-grained sedimentary rock.
In some optional embodiments, the quantitative characterization method further comprises the steps of:
c, calibrating a calculated value by using the total quartz content obtained by actual measurement; the calibrated content of biogenic quartz is characterized by the product of the content of biogenic quartz and the second proportionality coefficient; wherein, the second proportionality coefficient is the ratio of the total quartz content obtained by actual measurement to the calculated value of the total quartz content.
In the step c, the actually measured total content of the quartz refers to the actually and quantitatively detected mass percentage content of the quartz in the fine deposited rock, which is hereinafter referred to as WQuartz total'. Calculated value of total quartz content, hereinafter referred to as WQuartz assembly，WQuartz assemblyCharacterization of Si by product with silicon content in QuartzQuartz assemblyThus WQuartz assemblySi obtainable by the above calculationQuartz assemblyAnd calculating to obtain the second proportionality coefficient. Thus the corrected mass percentage of biogenic quartz in fine-grained sedimentary rock, hereinafter referred to as WBioquartz correction，WBioquartz correctionThe calculation can be performed by the formula shown in formula (7).
Formula (7) WCorrection of biological quartzWBiological quartz*WQuartz total'/WQuartz assembly
The features and properties of the present application are described in further detail below with reference to examples.
Example 1
A method for quantitative characterization of biogenetic quartz of fine-grained sedimentary rock, comprising:
s1, actually measured SiGeneral assembly、WFeldsparAnd WClay mineralSi was calculated from the formula (1-3)Quartz assembly。
S2, actually measured AlLand sourceSi was calculated from the formula (4-5)Biological quartzAnd calculating according to the formula (6) to obtain WBiological quartz。
S3, actually measuring WQuartz total'W is calculated from the formula (7)Bioquartz correction。
For the quantitative determination of each measured value, the following criteria are specifically referred to.
The clay mineral and whole rock X-ray diffraction analysis test is according to the standard SY/T5163-2018.
The trace element test is carried out according to the general rule of a standard DZ/T0223-2001 inductively coupled plasma mass spectrometry (ICP-MS) method.
Test example 1
By adopting the quantitative characterization method of the fine-grained sedimentary rock biogenetic quartz provided in example 1, a section of a fine-grained sedimentary rock development layer of the kawasaki 1-well Ordovician quincunx group-the ShinylLomaxi group is selected for quantitative characterization of the biogenetic quartz, and a histogram of the biogenetic quartz and each component is shown in fig. 2. From the calculation results, a large amount of bio-quartz is present in the bottom layer section of the quintet-Longmaxi group. The content of the biogenetic quartz is between 0.88 and 33.6 percent, the average value is 11.9 percent, and the content of the biogenetic quartz accompanied with a certain continental source-diagenetic quartz is between 4.8 and 30.5 percent, and the average value is 20.8 percent. In the high silicon section, the enrichment of the biological quartz makes an important contribution to the high silicon section. And at the upper part of one section of the Longmaxi group, the content of the biological quartz is sharply reduced, the content is between 0.15 and 7.5 percent, the average value is 3.3 percent, and at the moment, the content of the continental source-diagenetic quartz is gradually increased, and is between 28.6 and 34.8 percent, and the average value is 31.2 percent. Quartz of terrestrial origin begins to dominate.
The data provides quantitative basis for cleaning mineralogical and petrological characteristics, longitudinal and transverse differential distribution and evolution of the fine sedimentary rock, and provides basis for exploration, development and evaluation of shale gas.
In summary, the quantitative characterization method for the biogenetic quartz of the fine-grained sedimentary rock provided by the embodiment of the application is to combine geochemistry to calculate the quartz of the biological origin by the characterization of the silicon content, and determine the silicon content of the biogenetic quartz to carry out quantitative characterization by removing the silicon content of the quartz except the biological origin through the total silicon content of the quartz. The characterization research of the total silicon content of the quartz finds that the feldspar and the clay mineral have large influence on the silicon content, and the silicon content of the feldspar and the clay mineral is discharged according to the actually measured total silicon content to obtain more accurate total silicon content of the quartz, so that more accurate quantitative characterization results of the biological quartz are obtained.
The embodiments described above are some, but not all embodiments of the present application. The detailed description of the embodiments of the present application is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Claims (10)
1. A method for quantitative characterization of biogenetic quartz of fine-grained sedimentary rock, comprising: and (4) representing the total content of the silicon element in the quartz by the balance of the total amount of the silicon element in the rock stratum excluding the silicon element contained in the feldspar and the clay mineral.
2. The quantitative characterization method according to claim 1, wherein the content of silicon element in the feldspar is characterized by the product of the total content of the feldspar and the first content percentage; wherein the first content percentage is determined by the mass percentage of silicon element in albite and the mass percentage of silicon element in anorthite.
3. The quantitative characterization method according to claim 2, wherein the first content percentage is an average of a mass percentage of silicon element in albite and a mass percentage of silicon element in anorthite.
4. The quantitative characterization method according to claim 3, wherein the albite contains 32% by mass of silicon element and 19% by mass of silicon element.
5. The quantitative characterization method according to claim 1, wherein the content of elemental silicon in the clay mineral is characterized by the product of the total content of the clay mineral measured and the second content percentage; wherein the second content percentage is determined by the mass percentage of silicon element in illite, the mass percentage of silicon element in montmorillonite, the mass percentage of silicon element in chlorite and the mass percentage of silicon element in kaolinite.
6. The quantitative characterization method according to claim 5, wherein the second content percentage is an average of the mass percentage of silicon element in illite, the mass percentage of silicon element in montmorillonite, the mass percentage of silicon element in chlorite and the mass percentage of silicon element in kaolinite.
7. The quantitative characterization method according to claim 6, wherein the illite contains 21.7% by mass of silicon element, the montmorillonite contains 21.7% by mass of silicon element, the chlorite contains 21.1% by mass of silicon element, and the kaolinite contains 31.1% by mass of silicon element.
8. The quantitative characterization method according to claim 1, further comprising: and (4) representing the content of the silicon element in the biogenic quartz by using the residual quantity of the total content of the silicon element in the quartz excluding the silicon element in the land source rock-finished quartz.
9. The quantitative characterization method according to claim 8, wherein the content of silicon element in the land-source rock-forming quartz is characterized by the product of the content of aluminum element of the land-source cause obtained by actual measurement and a first proportional coefficient; wherein the first scaling factor has a value of 3.11.
10. The quantitative characterization method according to claim 8, further comprising: calibrating the calculated value according to the total quartz content obtained by actual measurement; the calibrated content of biogenic quartz is characterized by the product of the content of biogenic quartz and the second proportionality coefficient; wherein, the second proportionality coefficient is the ratio of the total quartz content obtained by actual measurement to the calculated value of the total quartz content.
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