CN110970096A - Geochemical microphase information identification system and method for fine-grained shale - Google Patents
Geochemical microphase information identification system and method for fine-grained shale Download PDFInfo
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Abstract
The invention belongs to the technical field of information processing, and discloses a system and a method for identifying geochemical microphase information of fine-grained shale, which are used for screening geochemical indexes capable of reflecting physical and chemical conditions of a deposition environment, accurately matching the response of each geochemical index to an ancient environment and comprehensively analyzing the internal relation among the indexes; and (3) establishing a geochemical micro-phase recognition system of the shale, and judging the fine change of the deposition microenvironment on the vertical section. The geochemical microfacies recognition system can well solve the problem that the mud shale deposition microenvironment is difficult to recognize, can distinguish the slight change of the deposition environment, and combines the physicochemical conditions of the deposition environment with the organic matter enrichment rule, thereby analyzing the main control factors of the organic matter-rich shale development in a targeted manner and predicting the distribution horizon of the favorable hydrocarbon source rocks.
Description
Technical Field
The invention belongs to the technical field of information processing, and particularly relates to a system and a method for identifying geochemical microphase information of fine-grained shale.
Background
Currently, the closest prior art: the identification of the shale sedimentary microfacies has important guiding significance for oil and gas exploration and development, however, as the lithological combination of the thick-layer fine-grain shale is relatively single and the sedimentary structure is difficult to identify, the traditional sedimentary facies mark (lithofacies characteristics, ancient organism combination and the like) is utilized to divide the sedimentary microfacies of the shale with great uncertainty. The shale deposition micro-phase is divided at present by means of mineral composition and element composition characteristics thereof, for example, the shale deposition micro-phase is quantitatively characterized according to conventional geological naming rules by acquiring average contents of clay minerals, quartz, feldspar, pyrite, organic matters and the like which can reflect the shale deposition characteristics and the environment. By utilizing the methods, the difference of the same sub-phase and different shale micro-phases can be distinguished locally, but the slight change of the deposition environment on the regional scale cannot be effectively reflected, and the slight change of the deposition environment has a crucial influence on the enrichment and preservation of organic matters in the shale. Research has shown that small changes in the deposition environment can cause differences in the geochemical characteristics of shale, especially the relative content of trace elements. And with the great improvement of the analysis precision of the trace elements in the shale, the method is favorable for fully revealing abundant deposition information contained in the shale. Therefore, in the thick-layer fine-grained shale lacking lithofacies and ancient biomarkers, by establishing a geochemical microfacies recognition system of the fine-grained shale, the sedimentation microenvironment of the shale is distinguished by reasonably utilizing geochemical indexes.
In summary, the problems of the prior art are as follows: the differences of the deposition environments can be reflected to a certain extent by utilizing the mineral composition and element composition characteristics of the shale, but the slight changes of the deposition environments cannot be described finely, so that the main control factors of the formation of the shale rich in organic matters cannot be analyzed effectively, and the prediction of the spatial distribution characteristics of the high-quality shale is not facilitated.
The difficulty of solving the technical problems is as follows: the representation of the slight change of the shale deposition environment needs to effectively identify the geochemical indexes reflecting the change of the ancient environment, further integrate the matching relation among the indexes and refine the geochemical microfacies reflected by the indexes.
The significance of solving the technical problems is as follows: the deposition microenvironment has a vital influence on the enrichment and preservation of organic matters, the identification of the deposition microenvironment and characteristics is beneficial to analyzing the main control factors of the formation of the high-quality shale, scientific basis is provided for predicting the spatial distribution characteristics of the high-quality shale, and therefore the method has important guiding significance for shale oil and gas exploration and development.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a system and a method for identifying geochemical microphase information of fine-grained shale.
The invention is realized in such a way that the method for identifying the geochemical microphase information of the fine-grained shale comprises the following steps:
the first step, screening and analyzing geochemical indexes capable of reflecting the physical and chemical conditions of the deposition environment, wherein the screening of the redox indexes is based on the U/Th, Ni/Co ratio and U, V, Mo content to distinguish ① strong reducing phase, ② times strong reducing phase, ② 0 weak reducing phase, ② 1 transition phase and ⑤ oxidation phase, ancient productivity indexes are characterized by biological barium (Ba) and P content to distinguish ① high productivity, ② medium productivity and ③ low productivity, ancient climate indexes are characterized by Sr/Ca ratio and B content to distinguish ① high salinity drought climate, ② high salinity semi-humid climate, ③ medium salinity humid climate and ④ medium salinity semi-humid climate, and besides the geochemical indexes of the three aspects, the organic carbon content is used as an index for representing the abundance of organic matters.
And secondly, establishing a clay shale geochemical microfacies recognition system, wherein the recognition system comprises a geochemical index recognition module and a deposition microenvironment analysis module.
The geochemical index identification module can be subdivided into four modules of oxidation-reduction conditions, ancient productivity levels, ancient climate characteristics and organic carbon content, and each module can be divided into microphases according to corresponding geochemical index characteristic values:
(1) characteristic values of geochemical indexes of the redox module are ① strong reducing phase (U/Th >1.25, Ni/Co >7, high Mo content), ② times strong reducing phase (U/Th >1.25, Ni/Co >7, high U, V content), ③ weak reducing phase (1.25> U/Th >0.75, 7> Ni/Co >5), ④ transition phase (1.25> U/Th >0.75) and ⑤ oxidation phase (U/Th < 0.75).
(2) The ancient productivity index characteristic values of ① high productivity (relatively high biological Ba, P content), ② medium productivity (relatively high biological Ba, P content), ③ low productivity (relatively low biological Ba, P content), wherein the relative high and low of element content depends on the background value of the analyzed shale.
(3) The ancient climate index characteristic values are ① high salinity drought climate (relatively high Sr/Ca; relatively high B content), ② high salinity semi-humid climate (relatively high Sr/Ca; medium B content), ③ medium salinity humid climate (medium Sr/Ca; relatively low B content) and ④ medium salinity semi-humid climate (medium Sr/Ca; medium B content), wherein the relative high and low of the element content and the ratio are determined according to the background value of the analyzed shale.
(4) Characteristic values of organic carbon content are ① high organic carbon content (TOC >1.5), ② medium organic carbon content (0.5< TOC <1.5), and ③ low organic carbon content (TOC < 0.5).
The deposition microenvironment analysis module integrates the geochemical indexes, and considers the matching relationship among the indexes, and the system identifies the deposition microenvironments of ① high ancient productivity level, medium salinity, humidity and strong reducing phase, ② low ancient productivity, high salinity, semi-humidity and secondary strong reducing phase, ③ high ancient productivity, medium salinity, semi-humidity and weak reducing phase, ④ transition phase and ⑤ drought, high salinity and oxidation phase.
Another object of the present invention is to provide a system for identifying geochemical microphase information of fine grained shale, which performs the method for identifying geochemical microphase information of fine grained shale, the system comprising:
the geochemical index analysis module is used for accurately matching the response of each geochemical index to the ancient environment through the geochemical indexes capable of reflecting the physical and chemical conditions of the deposition environment through a screen and comprehensively analyzing the internal relation among the indexes;
and the deposition microenvironment analysis module is used for establishing a clay shale geochemical micro-phase recognition system and judging the fine change of the deposition microenvironment on the vertical section.
Another object of the present invention is to provide an information data processing terminal that implements the method for identifying geochemical microphase information of fine-grained shale.
It is another object of the present invention to provide a computer-readable storage medium comprising instructions which, when run on a computer, cause the computer to perform the method for identifying geochemical microphase information of fine-grained shale.
In summary, the advantages and positive effects of the invention are: according to the invention, through screening the geochemical indexes capable of reflecting the physical and chemical conditions of the deposition environment, the response of the geochemical indexes to the ancient environment change is utilized, the internal relation among all indexes is comprehensively analyzed, the geochemical microfacies recognition system of the shale is established, the fine change of the deposition microenvironment on the vertical section is judged, and a scientific basis is provided for predicting the distribution space of the shale rich in organic matters. The geochemical microfacies recognition system can well solve the problem that the sedimentary microenvironment of the shale is difficult to recognize, can distinguish the slight change of the sedimentary environment, and combines the physicochemical conditions of the sedimentary environment with the enrichment rule of organic matters, thereby analyzing the main control factors of the organic-rich shale development in a targeted manner and predicting the distribution horizon of the favorable hydrocarbon source rocks.
Drawings
Fig. 1 is a schematic structural diagram of a geochemical microphase information identification system for fine-grained shale according to an embodiment of the invention;
in the figure: 1. a geochemical index analysis module; 2. and a deposition microenvironment analysis module.
Fig. 2 is a flowchart of a method for identifying geochemical microphase information of fine-grained shale according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In view of the problems in the prior art, the present invention provides a system and a method for identifying geochemical microphase information of fine-grained shale, which are described in detail below with reference to the accompanying drawings.
As shown in fig. 1, the geochemical microphase information identification system for fine-grained shale according to the embodiment of the invention comprises:
the geochemical index analysis module 1 is used for screening geochemical indexes capable of reflecting physical and chemical conditions of the deposition environment, accurately matching the response of each geochemical index to the ancient environment and comprehensively analyzing the internal relation among the indexes.
And the deposition microenvironment analysis module 2 is used for establishing a clay shale geochemical micro-phase recognition system and judging the fine change of the deposition microenvironment on the vertical section.
As shown in fig. 2, the method for identifying geochemical microphase information of fine-grained shale according to the embodiment of the invention comprises the following steps:
s201: screening geochemical indexes capable of reflecting physical and chemical conditions of the deposition environment, accurately matching the response of each geochemical index to the ancient environment, and comprehensively analyzing the internal relation among the indexes;
s202: and (3) establishing a geochemical micro-phase recognition system of the shale, and judging the fine change of the deposition microenvironment on the vertical section.
The technical solution of the present invention is further described below with reference to the accompanying drawings. The geochemical deposition and environmental analysis principle is used as a basis, geochemical indexes capable of reflecting oxidation-reduction conditions, ancient productivity, ancient climate and organic matter abundance are respectively selected and comprehensively matched, and geochemical microfacies are divided, so that a geochemical microfacies identification system is established.
The present invention will be further described with reference to the following examples.
A set of fine-grained shale of a genu tumidinoda qiongqiongqiongqiongqiongqiongqiongwu temple group continental shelter with the thickness of about 580m develops in the northeast China Koorhikung village area of the Sichuan basin. The lithological combination on the section is relatively single, silty shale and shale with fine granularity are mainly used, the sedimentary structure is not developed, and obvious lithofacies marks are lacked, so that the fine division of the shale sedimentary microfacies is relatively difficult. However, the land-shed facies may produce subtle differences in geochemical characteristics at various times due to changes in the deposition environment. Therefore, it is necessary to combine the changes of the geochemical characteristics of the shale on the basis of the traditional sedimentary microfacies and identify the fine changes of the sedimentary environment on the vertical section by means of the response of the changes of the paleoenvironmental. Through a geochemical micro-phase information identification system, the fine change of the deposition microenvironment on the vertical section is analyzed by utilizing a geochemical index identification module and a deposition microenvironment analysis module respectively.
(1) Oxidation-reduction conditions: the profile can be roughly divided into two sections according to the variation characteristic values (U/Th, Ni/Co ratio and U, V, Mo content) of the redox-sensitive element. The main body of the lower section of the section is in an anoxic environment, but obvious anoxic and oxygen alternation occurs once, which is represented as that the bottom of the lower section is in a strong reduction environment, the upward reduction is weakened, and the strong reduction environment occurs to the upper part of the lower section, and the change of the water depth or the influence of the upwelling can exist during the change of the oxidation-reduction environment; the upper section of the profile is an oxygen-poor-oxygen-containing environment, and the redox environment is relatively stable, possibly reflecting the continuous decline of sea level after sea invasion.
(2) Ancient productivity: the P element is relatively enriched at the bottom of the section, and the content of the Ba of the biological source is obviously enriched at the middle lower section of the section, which shows that the section has high ancient productivity. The biogenic Ba content decreased greatly in the upper section of the profile, indicating a decline after a dramatic increase in productivity throughout the profile.
(3) And (3) ancient climate change: the Mg/Ca ratio of the lower section of the section is obviously lower than that of the upper section of the section, the section shows humid climate characteristics, and the climate is gradually changed to drought towards the upper part of the section.
(4) Change in organic carbon content: two obvious high-value areas are formed on the organic carbon content of the section and are respectively positioned at the bottom and the middle lower part of the section, which shows that at least two organic matter enrichment processes exist in the deposition process, the corresponding deposition environment is a humid strong reduction environment, and the ancient productivity level is higher.
By combining the change characteristics of the deposition environment reflected by the geochemical characteristics of the shale, the upper section of the qionguengqiongsi group can be presumed to be shallow water terrestris deposition, and the deposition environment is characterized by drought, oxygen content and low ancient productivity level; the lower section is formed by alternate deposition of a deep-water land shed phase and a shallow-water land shed phase, but mainly takes the deep-water land shed phase as a main phase, and the organic-rich shale is mainly formed in the deep-water land shed phase with high ancient productivity level and good organic matter storage condition.
It should be noted that the embodiments of the present invention can be realized by hardware, software, or a combination of software and hardware. The hardware portion may be implemented using dedicated logic; the software portions may be stored in a memory and executed by a suitable instruction execution system, such as a microprocessor or specially designed hardware. Those skilled in the art will appreciate that the apparatus and methods described above may be implemented using computer executable instructions and/or embodied in processor control code, such code being provided on a carrier medium such as a disk, CD-or DVD-ROM, programmable memory such as read only memory (firmware), or a data carrier such as an optical or electronic signal carrier, for example. The apparatus and its modules of the present invention may be implemented by hardware circuits such as very large scale integrated circuits or gate arrays, semiconductors such as logic chips, transistors, or programmable hardware devices such as field programmable gate arrays, programmable logic devices, etc., or by software executed by various types of processors, or by a combination of hardware circuits and software, e.g., firmware.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (7)
1. A method for identifying geochemical microphase information of fine grained shale, characterized in that the method comprises the following steps:
screening geochemical indexes capable of reflecting physical and chemical conditions of a deposition environment, accurately matching the response of each geochemical index to an ancient environment, and comprehensively analyzing the internal relation among the indexes;
and secondly, establishing a geochemical microfacies recognition system of the shale, and judging the fine change of the deposition microenvironment on the vertical section.
2. The method for identifying geochemical microphase information of fine grained shale as claimed in claim 1, wherein said first step is carried out by screening and analyzing geochemical indexes reflecting physicochemical conditions of the sedimentary environment, wherein the screening of redox indexes is based on the U/Th, Ni/Co ratio and U, V, Mo content, and the screening of redox indexes comprises ① strong reduced phase, ② strong reduced phase, ② 0 weak reduced phase, ② 1 transition phase and ⑤ oxidized phase, wherein ancient productivity indexes are characterized by the content of biological barium and P, and the ancient productivity indexes comprise ① high productivity, ② medium productivity and ③ low productivity, wherein the ancient climate indexes are characterized by the Sr/Ca ratio and B content, and the ancient climate indexes comprise ① high salinity drought climate, ② high salinity semi-humid climate, ③ medium salinity humid climate and ④ medium salinity semi-humid climate, wherein besides the geochemical indexes of the above three aspects, the organic carbon content is used as an index of abundance.
3. The method for identifying geochemical microphase information of fine-grained shale according to claim 1, wherein the second step is carried out by: establishing a clay shale geochemical microfacies recognition system, wherein the recognition system comprises a geochemical index recognition module and a deposition microenvironment analysis module; the geochemical index identification module is subdivided into four modules of oxidation-reduction conditions, ancient productivity levels, ancient climate characteristics and organic carbon content, and each module can divide a microphase according to the characteristic value of the corresponding geochemical index;
the deposition microenvironment analysis module integrates the geochemical indexes, and adopts the matching relationship among the indexes to recognize the deposition microenvironment including ① high ancient productivity level, medium salinity, humidity and strong reducing phase, ② low ancient productivity, high salinity, semi-humidity and secondary strong reducing phase, ③ high ancient productivity, medium salinity, semi-humidity and weak reducing phase, ④ transition phase, ⑤ drought, high salinity and oxidation phase, and on the basis, the fine change of the deposition microenvironment on the vertical section is judged.
4. The method for geochemical microphase information identification of fine grain shale as recited in claim 3, further comprising:
(1) oxidation-reduction module localization index characteristic value: the U/Th in the strong reduction phase is more than 1.25, the Ni/Co is more than 7, and the content of Mo is high; the content of U/Th in the secondary strong reduction phase is more than 1.25, the content of Ni/Co in the secondary strong reduction phase is more than 7, and the content of the Ni/Co in the secondary strong reduction phase is high U, V; 1.25> U/Th >0.75, 7> Ni/Co >5 in the weakly reducing phase; 1.25> U/Th >0.75 in the transition phase; U/Th in the oxidation phase is less than 0.75;
(2) characteristic value of ancient productivity index: high productivity, relatively high biological Ba and P content; moderate productivity, relatively moderate biological Ba, P content; low productivity, relatively low biological Ba, P content; wherein the relative high or low of each original content is related to the background value of the analyzed shale;
(3) ancient climate index characteristic value: high salinity arid climate, relatively high Sr/Ca and relatively high B content; high salinity semi-humid climate, relatively high Sr/Ca and moderate B content; moderate salinity humid climates, moderate Sr/Ca and relatively low B content; moderate salinity semi-humid climate, moderate Sr/Ca and moderate B content; wherein the relative high or low of each original content is related to the background value of the analyzed shale;
(4) characteristic value of organic carbon content: high organic carbon content, TOC > 1.5; medium organic carbon content, 0.5< TOC < 1.5; low organic carbon content, TOC < 0.5.
5. A geochemical microphase information identification system for fine grained shale for performing the method for geochemical microphase information identification of fine grained shale according to any one of claims 1 to 4, characterized in that the geochemical microphase information identification system for fine grained shale comprises:
the geochemical index analysis module is used for accurately matching the response of each geochemical index to the ancient environment by screening the geochemical index capable of reflecting the physical and chemical conditions of the deposition environment and comprehensively analyzing the internal relation among the indexes;
and the deposition microenvironment analysis module is used for establishing a clay shale geochemical micro-phase recognition system and judging the fine change of the deposition microenvironment on the vertical section.
6. An information data processing terminal for implementing the method for identifying geochemical microphase information of fine-grained shale according to any one of claims 1 to 4.
7. A computer-readable storage medium comprising instructions which, when run on a computer, cause the computer to perform the method of geochemical microphase information identification of fine-grained shale according to any one of claims 1 to 4.
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| CN111948374A (en) * | 2020-08-14 | 2020-11-17 | 中国地质大学（武汉） | Geochemical identification method and system for organic-rich shale layer section in shale |
| CN116228453A (en) * | 2023-03-15 | 2023-06-06 | 中国石油大学(华东) | Shale organic matter enrichment control factor evaluation method, system, equipment and terminal |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111896674A (en) * | 2020-07-15 | 2020-11-06 | 成都理工大学 | Shale oil and gas reservoir body deposition microphase processing system and identification method |
| CN111948374A (en) * | 2020-08-14 | 2020-11-17 | 中国地质大学（武汉） | Geochemical identification method and system for organic-rich shale layer section in shale |
| CN116228453A (en) * | 2023-03-15 | 2023-06-06 | 中国石油大学(华东) | Shale organic matter enrichment control factor evaluation method, system, equipment and terminal |
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