Lithofacies analysis method for continental facies fine-grained sedimentary rocks

Abstract

A lithofacies analysis method for continental facies fine-grained sedimentary rocks includes classifying lithofacies according to the lithology or lithological association mode, the content of organiccarbon, the content of silicon and the content of calcium, and establishing lithofacies classification rules; extracting a core of a to-be-analyzed fine-grained sedimentary rock, identifying a lithology or lithological association interface in the core, and determining the lithofacies type of the to-be-analyzed fine-grained sedimentary rock according to the lithology or lithological association and the lithofacies classification and naming rules; determining the characteristic parameters of each type of lithofacies, determining the favorable lithofacies, and establishing logging evaluation criteria of the favorable lithofacies. The lithofacies analysis method has the advantages that the lithofacies is classified according to the lithological association mode, the abundance of the organiccarbon, the abundance of the silicon and the abundance of the calcium, the lithofacies classification rules are established, and accordingly, the lithofacies analysis method can be applied to the continental facies fine-grained sedimentary rocks.

Description

technical field [0001] The invention relates to the technical field of shale gas exploration and development, and more specifically, to a lithofacies analysis method for continental fine-grained sedimentary rocks. Background technique [0002] Fine-grained sedimentary rock (fine-grained sedimentary rock) refers to sedimentary rock composed of "fine-grained matter" with a particle size of <62 μm, and its components mainly include clay minerals, silt, carbonate, and organic matter (Schieber and Zimmerle, 1998; Aplin and Macquaker, 2011; Jiang Zaixing et al., 2013). Among them, those with well-developed lamination are called shale, and those with no lamination are called argillaceous rock (Jiang Zaixing et al., 2013). Fine-grained sedimentary rocks are the material basis for the formation of shale gas. Whether domestic or foreign, shale gas is produced in fine-grained sedimentary rocks. [0003] During the multi-cycle tectonic evolution and deposition process in China, mul...

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Problems solved by technology

[0005] The purpose of the present invention is to propose a lithofacies analysis method for continental fine-grained sedimentary rocks, which can overcome the defects of the narrow scope of application of existing analysis methods, can finely evaluate the lithofacies of continental fine-grained sedimentary rocks, and then determine the lithofacies that are beneficial to geology and engineering

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