lithofacies division method for the shale based on Fisher discriminant analysis

A technology of lithofacies division and discriminant analysis, which is applied in the field of oil and gas exploration, can solve problems such as difficulty in subdividing lithofacies and fine grain size of mudstone, and achieve the effect of improving the division accuracy

Inactive Publication Date: 2019-08-02
CHINA UNIV OF GEOSCIENCES (BEIJING)
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Problems solved by technology

At present, the lithofacies classification based on well logging data is mainly for sandstone. Due to the high degree of differentiation of differen

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  • lithofacies division method for the shale based on Fisher discriminant analysis
  • lithofacies division method for the shale based on Fisher discriminant analysis
  • lithofacies division method for the shale based on Fisher discriminant analysis

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[0039] The implementation mode of the present invention is illustrated by specific specific examples below, and those who are familiar with this technology can easily understand other advantages and effects of the present invention from the contents disclosed in this description. Obviously, the described embodiments are a part of the present invention. , but not all examples. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0040]In the embodiment of the present invention, three shale oil exploration wells (Fanye 1, Liye 1, and Niuye 1) in the Paleogene Shahejie Formation in Dongying Sag are taken as the implementation objects, including data such as cores, well logging, and mud logging. Data: Well Fanye 1 is 225m, Well Liye 1 is 130m, and Well Niuye 1 is 70m. Well logging data include GR, AC, SP, R25, DEN and CNL c...

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Abstract

The embodiment of the invention discloses a lithofacies division method for the shale based on Fisher discriminant analysis. According to mineral compositions, a sedimentary structure and organic matter contents, mud rock lithofacies division is carried out to obtain a mud rock lithofacies division class result; a logging identification mode pattern of the mud rock lithofacies is established and awell logging curve class reflecting the lithology of the rock is selected based on the logging identification mode pattern; Fisher discriminant analysis is performed by SPSS software; on the basis ofcore logging data, a mud rock lithofacies class is determined and, the well logging curve reflecting the lithofacies characteristics is selected, and a lithofacies determination classification equation is established; according to a well logging curve of an unknown lithofacies, a function value of the lithofacies discriminant classification equation is obtained; and on the basis of the function value, a mud rock lithofacies division class to which the unknown lithofacies is determined. According to the invention, for the well section being lack of data like the core, logging, and diffractionanalysis, the mud rock lithofacies can be divided in details by using the lithofacies determination equation based on the well logging data, thereby improving the division precision and promoting theoil exploration.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of oil and gas exploration, and in particular to a method for shale lithofacies division based on Fisher discriminant analysis. Background technique [0002] With the development of the petroleum industry, the focus of oil and gas exploration has gradually shifted to unconventional oil and gas reservoirs, and the exploration and development of fine-grained deposits is one of the current hot issues. At present, scholars at home and abroad have carried out many studies on fine-grained sediments, mainly focusing on petrological characteristics, reservoir characteristics, genetic types, lithofacies division, and sequence division, to clarify the mineral composition and structural characteristics of fine-grained sedimentary rocks, and to identify effective reservoirs. According to the type of set space, establishing the relationship between the trace element chemical characteristics of d...

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Application Information

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IPC IPC(8): G01V11/00
CPCG01V11/00
Inventor 王红亮赵贺梁金同黄镕杰
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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