A method for characterizing the heterogeneity of fine-grained sedimentary rocks using chemical-sedimentary facies

Abstract

The invention provides a method for representing pulveryte anisotropism by using chemical-sedimentary facies, and belongs to the technical field of the petroleum and gas exploration. The method is capable of more rapidly, intuitively and carefully describing and analyzing the pulveryte anisotropism in the large area and high resolution. The method is used for representing the pulveryte anisotropism by using the analysis of the chemical-sedimentary facies, and specifically comprises the following steps: to obtain a pulveryte sample surface picture synchronously in the two-dimensional plane from the core to the rock slice dimension and inorganic geochemistry element in-situ distribution information, and superposing two parties, and dividing the chemical-sedimentary facies; extracting in-situ inorganic geochemistry element information in the two-dimensional plane, quantificationally analyzing the pulveryte chemical-sedimentary facies; and describing and analyzing the pulveryte anisotropism through the division and quantitative analysis of the chemical-sedimentary facies.

Description

technical field [0001] The invention relates to the field of oil and gas exploration, in particular to the field of fine-grained sedimentary rocks, and in particular to a method for characterizing the heterogeneity of fine-grained sedimentary rocks by using chemical-sedimentary facies. Background technique [0002] The fine-grained sedimentary rocks are relatively fine in lithology and uniform in color, and it is difficult to directly identify the sedimentary structure and lithological changes of the fine-grained sedimentary rock samples with the naked eye, and the sedimentary facies can only be roughly divided. Changes can occur at the centimeter or even millimeter level. The current conventional analysis methods have a long analysis cycle and are difficult to be representative when sampling. Some analysis and testing methods that require samples to be crushed and mixed will cause key information to be covered by a lot of useless information. , resulting in the uncertainty ...

AI Technical Summary

Problems solved by technology

However, during the deposition of sedimentary rocks, the depositional environment and provenance types will cause the uneven distribution of inorganic geochemical elements in space. The existing analysis methods have not effectively analyzed the depositional environment and matter of fine-grained sedimentary rocks from the above aspects. Source types, etc., cannot more intuitively and effectively describe the heterogeneity of fine-grained sedimentary rocks, reflect the characteristics of fine-grained sedimentary rocks, and thus cannot provide more refined lithology models and reliable facies frameworks for the exploration and development of unconventional oil and gas

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