CN112113958A - Geochemical quantitative characterization method and system for shale striated layer - Google Patents
Geochemical quantitative characterization method and system for shale striated layer Download PDFInfo
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- 238000012512 characterization method Methods 0.000 title claims abstract description 32
- 230000003287 optical effect Effects 0.000 claims abstract description 35
- 238000000034 method Methods 0.000 claims abstract description 19
- 239000011435 rock Substances 0.000 claims abstract description 13
- 238000007781 pre-processing Methods 0.000 claims abstract description 10
- 238000005498 polishing Methods 0.000 claims description 11
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims description 8
- 229910052683 pyrite Inorganic materials 0.000 claims description 7
- NIFIFKQPDTWWGU-UHFFFAOYSA-N pyrite Chemical compound [Fe+2].[S-][S-] NIFIFKQPDTWWGU-UHFFFAOYSA-N 0.000 claims description 7
- 239000011028 pyrite Substances 0.000 claims description 7
- 238000002203 pretreatment Methods 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 2
- -1 argillaceous Chemical compound 0.000 claims 1
- 238000011161 development Methods 0.000 abstract description 9
- 238000011160 research Methods 0.000 abstract description 8
- 239000004215 Carbon black (E152) Substances 0.000 abstract description 7
- 230000008021 deposition Effects 0.000 abstract description 7
- 229930195733 hydrocarbon Natural products 0.000 abstract description 7
- 150000002430 hydrocarbons Chemical class 0.000 abstract description 7
- 239000003208 petroleum Substances 0.000 abstract description 6
- 238000011156 evaluation Methods 0.000 abstract description 5
- 239000004927 clay Substances 0.000 description 6
- 238000004458 analytical method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 244000137852 Petrea volubilis Species 0.000 description 3
- 238000005553 drilling Methods 0.000 description 3
- 241000446313 Lamella Species 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 229910052593 corundum Inorganic materials 0.000 description 2
- 238000010884 ion-beam technique Methods 0.000 description 2
- 239000005416 organic matter Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 229910001845 yogo sapphire Inorganic materials 0.000 description 2
- 238000012937 correction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000000095 laser ablation inductively coupled plasma mass spectrometry Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000013517 stratification Methods 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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Abstract
A geochemical quantitative characterization method and system for shale striated layers are disclosed. The method can comprise the following steps: preprocessing a shale sample, and scanning a section of the shale sample to obtain an optical picture; acquiring geochemical characteristics of the shale sample, wherein the geochemical characteristics correspond to the optical picture; placing the shale sample in an X-ray rock core scanning analyzer to obtain the element composition characteristics of different striation layers; the elemental composition features are accurately mapped to the optical photographs and different types of texture layer elemental composition features are analyzed. The method provides a basis for developing shale heterogeneity characterization, ancient environment restoration during deposition and shale hydrocarbon evolution research by quantitatively characterizing the geochemical element composition characteristics corresponding to the shale stripe structure, and has certain application value in the petroleum exploration and development fields of shale gas resource evaluation, unconventional oil and gas exploration and the like.
Description
Technical Field
The invention relates to the field of petroleum exploration and development, in particular to a geochemical quantitative characterization method and system for a shale streak layer.
Background
The striated layer (also called a fine layer), which is the first unit of sedimentary stratification, is the thinnest sedimentary layer discernible to the naked eye in sedimentary rocks, and is typically several millimeters or less than 1 millimeter thick. The morphology may be linear, curvilinear, etc., and the same striated layer may have a relatively uniform composition and structure, but may have some variation in size fraction and be a co-product under the same hydrodynamic conditions. With the development of oil and gas exploration and development of shale in recent years, research on shale structures is further intensive. The early-stage research shows that the shale has different textures, such as silty texture, organic texture, carbonate texture, clay texture and the like, regardless of sea phase shale, lake phase shale or sea-land transition phase shale. The development of the striation layer indicates that the shale has heterogeneity, the heterogeneity has influence on hydrocarbon generation, reservoir performance, gas content and the like of the shale, qualitative or semi-quantitative characterization work is carried out on structural features of the striation layer of the shale, such as definition, continuity, density or thickness and the like by using tools such as an electron microscope, a scanning electron microscope and the like, and the composition content, granularity and the like of particles in the striation layer are related by using an automatic mineral analysis instrument and image analysis software. Aiming at the organic texture layer, a microscopic quantitative characterization method of a laser ablation-inductively coupled plasma mass spectrometry combined experiment is applied. However, the geochemical element characteristics of different striations are not deeply researched by the method, and the geochemical element characteristics in the striations contain paleoenvironmental information in the shale deposition period, so that a basis can be provided for recovering paleoclimates, paleowatery body environments and paleobiological productivity, and the method is helpful for researches on organic matter enrichment, hydrocarbon evolution and the like in the shale. Therefore, there is a need to develop a method and system for geochemical quantitative characterization of shale streaks.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention provides a geochemical quantitative characterization method and a geochemical quantitative characterization system for a shale streak layer, which can provide a basis for carrying out shale heterogeneity characterization, ancient environment recovery during deposition and shale hydrocarbon evolution research by quantitatively characterizing the geochemical element composition characteristics corresponding to the shale streak layer structure, and have certain application value in the petroleum exploration and development fields of shale gas resource evaluation, unconventional oil and gas exploration and the like.
According to one aspect of the invention, a geochemical quantitative characterization method for shale coatings is provided. The method may include: preprocessing a shale sample, and scanning a section of the shale sample to obtain an optical picture; acquiring the geochemical characteristics of the shale sample, wherein the geochemical characteristics correspond to the optical picture; placing the shale sample in an X-ray rock core scanning analyzer to obtain the element composition characteristics of different striations; and precisely corresponding the element composition characteristics to the optical photo, and analyzing different types of texture layer element composition characteristics.
Preferably, the pre-treatment comprises: and cutting the shale sample into a regular shape perpendicular to the surface of the striation layer, and polishing a section which is perpendicular to the surface of the striation layer and has obvious striation layer characteristics to be smooth.
Preferably, the geochemical characteristics include the type of lamella, thickness, density of the shale sample.
Preferably, the stripe layer types comprise silty stripe layers, sand paper stripe layers, organic stripe layers, carbonate stripe layers, clay stripe layers, pyrite stripe layers and mixed stripe layers.
Preferably, the elemental composition characteristics include elemental concentration data and oxide content and relative content of Al-U.
According to another aspect of the present invention, a system for the quantitative characterization of geochemistry of shale streaks is provided, the system comprising: a memory storing computer-executable instructions; a processor executing computer executable instructions in the memory to perform the steps of: preprocessing a shale sample, and scanning a section of the shale sample to obtain an optical picture; acquiring the geochemical characteristics of the shale sample, wherein the geochemical characteristics correspond to the optical picture; placing the shale sample in an X-ray rock core scanning analyzer to obtain the element composition characteristics of different striations; and precisely corresponding the element composition characteristics to the optical photo, and analyzing different types of texture layer element composition characteristics.
Preferably, the pre-treatment comprises: and cutting the shale sample into a regular shape perpendicular to the surface of the striation layer, and polishing a section which is perpendicular to the surface of the striation layer and has obvious striation layer characteristics to be smooth.
Preferably, the geochemical characteristics include the type of lamella, thickness, density of the shale sample.
Preferably, the stripe layer types comprise silty stripe layers, sand paper stripe layers, organic stripe layers, carbonate stripe layers, clay stripe layers, pyrite stripe layers and mixed stripe layers.
Preferably, the elemental composition characteristics include elemental concentration data and oxide content and relative content of Al-U.
The method and apparatus of the present invention have other features and advantages which will be apparent from or are set forth in detail in the accompanying drawings and the following detailed description, which are incorporated herein, and which together serve to explain certain principles of the invention.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail exemplary embodiments thereof with reference to the attached drawings, in which like reference numerals generally represent like parts.
Fig. 1 shows a flow chart of the steps of a method for the quantitative geochemical characterization of shale streaks in accordance with the present invention.
Fig. 2a, 2b and 2c show schematic diagrams of regular shapes of cubes, cylinders, half-cylinders, respectively, according to an embodiment of the invention.
FIG. 3 shows a schematic view of an optical photograph according to one embodiment of the present invention.
FIG. 4 shows a schematic representation of the geochemical properties of a shale sample in accordance with one embodiment of the present invention.
FIG. 5 shows a schematic diagram of the exact correspondence of elemental composition features to an optical photograph, according to one embodiment of the invention.
Detailed Description
The invention will be described in more detail below with reference to the accompanying drawings. While the preferred embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
Fig. 1 shows a flow chart of the steps of a method for the quantitative geochemical characterization of shale streaks in accordance with the present invention.
In this embodiment, the method for geochemical quantitative characterization of shale streaks according to the invention may comprise: 101, preprocessing a shale sample, and scanning a section of the shale sample to obtain an optical picture; 102, acquiring geochemical characteristics of a shale sample, wherein the geochemical characteristics correspond to optical pictures; 103, placing the shale sample in an X-ray rock core scanning analyzer to obtain the element composition characteristics of different striation layers; and 104, accurately corresponding the element composition characteristics to the optical photo, and analyzing different types of texture layer element composition characteristics.
In one example, the pre-processing comprises: and cutting the shale sample into a regular shape perpendicular to the grain layer surface, and polishing a section which is perpendicular to the grain layer surface and has obvious grain layer characteristics to be smooth.
In one example, the geochemical characteristics include the type of streaks, thickness, density of the shale sample.
In one example, the cord layer types include silty cord layers, sandpaper cord layers, organic cord layers, carbonate cord layers, clay cord layers, pyrite cord layers, and hybrid cord layers.
In one example, the elemental composition characteristics include elemental concentration data and oxide content and relative content of Al-U.
Fig. 2a, 2b and 2c show schematic diagrams of regular shapes of cubes, cylinders, half-cylinders, respectively, according to an embodiment of the invention.
Specifically, the geochemical quantitative characterization method of the shale streak layer according to the invention can comprise the following steps:
the shale sample is preprocessed, the shale sample is perpendicular to a grain layer surface, the shale sample is cut into a regular shape which can be smoothly placed into an analysis instrument by the methods of drilling by a drill bit, cutting by a grinding wheel and the like, a section which is perpendicular to the grain layer surface and has obvious grain layer characteristics is polished smoothly by solid polishing, ion beam polishing and the like, the thickness and density information of the grain layer can be more accurately reflected by the section, meanwhile, the grain layer information is maximally reflected on the same sample length, a high-precision camera in analysis equipment is used for scanning the section to obtain an optical picture, the optical picture is a picture which can clearly reflect the characteristics of the shale grain layer type, the thickness, the density and the like, and the grain layer characteristics of the sample which can not reflect the related information can be obtained by the methods of observation under a rock slice microscope or scanning electron microscope and the like for the sample, wherein the regular shape comprises a cube, a cylinder, a, Semi-cylindrical, etc., as shown in fig. 2a-2 c.
The length of a sample, the form of a grain layer, the number of different grain layers in a sample range, the arrangement mode of the grain layers, the thickness of a single grain layer, the density of the grain layers and the like are measured and counted through a ruler, a vernier caliper, auxiliary drawing software and the like, the type, the thickness and the density of the grain layer of the shale sample are obtained and correspond to an optical picture, wherein the grain layer type comprises a silty grain layer, a sand paper grain layer, an organic matter grain layer, a carbonate grain layer, a clay grain layer, a pyrite grain layer and a mixed grain layer, the thickness is the average thickness of the single grain layer, and the density is the number of the grain layers in unit length.
And placing the shale sample in an X-ray core scanning analyzer to obtain the element composition characteristics of different striations, wherein the element composition characteristics comprise Al-U element concentration data, oxide content and relative content, the element concentration data needs to be corrected, and the X-ray scanning point of the X-ray core scanning analyzer is smaller than the minimum thickness of the striations.
And (3) accurately corresponding the element composition characteristics to the optical photo, namely, closely corresponding the element composition characteristics to the properties and the thickness of the texture layer, preferably obtaining element composition data corresponding to the optical photo one by one in the same instrument, and analyzing the element composition characteristics of different types of the texture layer.
The method provides a basis for developing shale heterogeneity characterization, ancient environment restoration during deposition and shale hydrocarbon evolution research by quantitatively characterizing the geochemical element composition characteristics corresponding to the shale striated layer structure, and has certain application value in the petroleum exploration and development fields of shale gas resource evaluation, unconventional oil and gas exploration and the like.
Application example
To facilitate understanding of the solution of the embodiments of the present invention and the effects thereof, a specific application example is given below. It will be understood by those skilled in the art that this example is merely for the purpose of facilitating an understanding of the present invention and that any specific details thereof are not intended to limit the invention in any way.
Selecting a well drilling rock core, recording the depth range of the rock core, enabling a shale sample to be vertical to a striation layer surface, cutting the shale sample into a regular shape by methods such as drilling by a drill bit, abrasive wheel cutting and the like, and polishing a section which is vertical to the striation layer surface and has obvious striation layer characteristics by methods such as solid polishing, ion beam polishing and the like, so that the section can more accurately reflect the thickness and density information of the striation layer, meanwhile, the striation layer information is maximally reflected on the same sample length, and the sample specification is suitable for being placed in an Itrax X Ray (XRF) rock core scanner.
FIG. 3 shows a schematic view of an optical photograph according to one embodiment of the present invention.
The core sample is laid flat, a scale is placed beside the core sample, and then a section is scanned by a high-precision camera in the analysis equipment to obtain an optical picture, as shown in fig. 3, the optical picture is a picture capable of clearly reflecting characteristics such as shale streak type, thickness and density.
FIG. 4 shows a schematic representation of the geochemical properties of a shale sample in accordance with one embodiment of the present invention.
Measuring and counting the length of a sample, the form of a grain layer, the number of different grain layers in a sample range, the arrangement mode of the grain layers, the thickness of a single grain layer, the density of the grain layers and the like by using a ruler, a vernier caliper, auxiliary drawing software and the like to obtain the type, the thickness and the density of the grain layer of the shale sample, wherein the type, the thickness and the density of the grain layer are shown in figure 4 and correspond to an optical picture (figure 3), wherein 7 dark stripes are formed, the thickness is 0.7-11.0mm, the average thickness is 5.25mm, and the density of the grain layer is 11.7 stripes/10 cm; 6 light-colored stripes with the thickness of 2.4-6.2mm, the average thickness of 3.87mm and the stripe layer density of 10 stripes/10 cm.
FIG. 5 shows a schematic diagram of the exact correspondence of elemental composition features to an optical photograph, according to one embodiment of the invention.
Placing the shale sample in an X-ray rock core scanning analyzer to obtain the contents of elements related to the environment, including Sr, CaO and TiO2、K2O、Al2O3And the relative content of the elements is obtained by logarithmic correction of the elements or oxides. Accurately corresponding the element composition characteristics to the optical photo, namely closely corresponding the element composition characteristics to the properties and the thickness of the grain layer, obtaining element composition data corresponding to the optical photo one by one in the same instrument, analyzing the element composition characteristics of different types of the grain layer, and completing the quantitative characterization of geochemical elements of the grain layer, as shown in figure 5, wherein the Sr and CaO contents show high values at a light-color grain layer and low values at a dark-color grain layer; TiO 22、K2O、Al2O3The content shows a low value in the light-colored layer and in the darkThe color stripe layer shows a high value, and the deposition environment at the time of forming the stripe layer can be analyzed by the composition of the geochemical elements in the stripe layer.
In conclusion, the invention provides a basis for carrying out shale heterogeneity characterization, depositional environment recovery during deposition and shale hydrocarbon evolution research by quantitatively characterizing the geochemical element composition characteristics corresponding to the shale stripe structure, and has certain application value in the petroleum exploration and development fields of shale gas resource evaluation, unconventional oil and gas exploration and the like.
It will be appreciated by persons skilled in the art that the above description of embodiments of the invention is intended only to illustrate the benefits of embodiments of the invention and is not intended to limit embodiments of the invention to any examples given.
According to an embodiment of the invention, there is provided a system for geochemical quantitative characterization of shale streaks, the system comprising: a memory storing computer-executable instructions; a processor executing computer executable instructions in the memory to perform the steps of: preprocessing a shale sample, and scanning a section of the shale sample to obtain an optical picture; acquiring geochemical characteristics of the shale sample, wherein the geochemical characteristics correspond to the optical picture; placing the shale sample in an X-ray rock core scanning analyzer to obtain the element composition characteristics of different striation layers; the elemental composition features are accurately mapped to the optical photographs and different types of texture layer elemental composition features are analyzed.
In one example, the pre-processing comprises: and cutting the shale sample into a regular shape perpendicular to the grain layer surface, and polishing a section which is perpendicular to the grain layer surface and has obvious grain layer characteristics to be smooth.
In one example, the geochemical characteristics include the type of streaks, thickness, density of the shale sample.
In one example, the cord layer types include silty cord layers, sandpaper cord layers, organic cord layers, carbonate cord layers, clay cord layers, pyrite cord layers, and hybrid cord layers.
In one example, the elemental composition characteristics include elemental concentration data and oxide content and relative content of Al-U.
The system provides a basis for developing shale heterogeneity characterization, ancient environment restoration during deposition and shale hydrocarbon evolution research by quantitatively characterizing the geochemical element composition characteristics corresponding to the shale stripe structure, and has certain application value in the petroleum exploration and development fields of shale gas resource evaluation, unconventional oil and gas exploration and the like.
It will be appreciated by persons skilled in the art that the above description of embodiments of the invention is intended only to illustrate the benefits of embodiments of the invention and is not intended to limit embodiments of the invention to any examples given.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.
Claims (10)
1. A geochemical quantitative characterization method for shale coatings is characterized by comprising the following steps:
preprocessing a shale sample, and scanning a section of the shale sample to obtain an optical picture;
acquiring the geochemical characteristics of the shale sample, wherein the geochemical characteristics correspond to the optical picture;
placing the shale sample in an X-ray rock core scanning analyzer to obtain the element composition characteristics of different striations;
and precisely corresponding the element composition characteristics to the optical photo, and analyzing different types of texture layer element composition characteristics.
2. The method for geochemical quantitative characterization of shaly streaks as claimed in claim 1, wherein said pre-treatment comprises:
and cutting the shale sample into a regular shape perpendicular to the surface of the striation layer, and polishing a section which is perpendicular to the surface of the striation layer and has obvious striation layer characteristics to be smooth.
3. The method for geochemical quantitative characterization of shale streaks as claimed in claim 1, wherein the geochemical characteristics include the type of streaks, thickness, density of the shale sample.
4. The method for geochemical quantitative characterization of a shale streak layer of claim 3, wherein the streak layer types comprise silty, sandpaper, organic, carbonate, argillaceous, pyrite, and mixed streak layers.
5. The method for geochemical quantitative characterization of shale streaks as claimed in claim 1, wherein said elemental composition characteristics include elemental concentration data and oxide content and relative content of Al-U.
6. A system for geochemical quantitative characterization of shale streaks, the system comprising:
a memory storing computer-executable instructions;
a processor executing computer executable instructions in the memory to perform the steps of:
preprocessing a shale sample, and scanning a section of the shale sample to obtain an optical picture;
acquiring the geochemical characteristics of the shale sample, wherein the geochemical characteristics correspond to the optical picture;
placing the shale sample in an X-ray rock core scanning analyzer to obtain the element composition characteristics of different striations;
and precisely corresponding the element composition characteristics to the optical photo, and analyzing different types of texture layer element composition characteristics.
7. The system for geochemical quantitative characterization of shallowprints of claim 6, wherein said preprocessing comprises:
and cutting the shale sample into a regular shape perpendicular to the surface of the striation layer, and polishing a section which is perpendicular to the surface of the striation layer and has obvious striation layer characteristics to be smooth.
8. The system for geochemical quantitative characterization of shale streaks of claim 6, wherein the geochemical characteristics include streak type, thickness, density of the shale sample.
9. The system for geochemical quantitative characterization of shale streaks of claim 8, wherein the types of streaks include silty streaks, sandpaper streaks, organic streaks, carbonate streaks, argillaceous streaks, pyrite streaks, and mixed streaks.
10. The system for geochemical quantitative characterization of shaly streaks of claim 6, wherein said elemental composition characteristics include elemental concentration data and oxide content and relative content of Al-U.
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| US20230160269A1 (en) * | 2021-11-23 | 2023-05-25 | Saudi Arabian Oil Company | System and method for automated drill cutting sampling, preparation, analysis, and packaging |
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