Shale classification method

A classification method and technology for shale, applied in the field of petroleum exploration and development geology, which can solve the problems of not taking into account the importance of organic matter components and classification boundaries, etc.

Inactive Publication Date: 2014-08-27
董春梅
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Problems solved by technology

This method is systematic but does not take into account the importance of organic matter components and the classification boundaries are questionable

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Embodiment

[0047] According to the fact that the Fu 2 Member in Subei Basin is mainly in shallow lake and semi-deep lake environment, a large set of mud shale is developed, which is rich in types and part of the mud shale is oil-bearing. It is necessary to carry out geological research on shale and classify shale in the Fu 2 Member of Subei Basin.

[0048] The first step is to determine the macroscopic structure type of the mud shale of the Fu 2 Member through core observation and according to the macroscopic structure classification standard. In the study area, there are abundant macroscopic structure types in the Fu 2 Member, ranging from sheet to block, with thin layer and layer as the main types, followed by block, lamellar and sheet.

[0049] In the second step, the type of organic matter in the shale is determined to be sapropelic through kerogen analysis; the total organic carbon content of the shale is determined through organic carbon analysis, using the total organic carbon con...

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Abstract

The invention discloses a shale classification method. The method includes the first step of determining the types of macroscopic structures of shales by observing shale cores, the second step of determining organic matter types and total content of organic carbon through kerogen and organic carbon analysis and obtaining the volume fraction of organic matter components through the total content of organic carbon, a conversion coefficient, the organic matter density and the rock density, the third step of determining mineral composition of the shales and obtaining the volume fraction of calcareous mineral components, the volume fraction of felsic mineral components and the volume fraction of clay mineral components through thin section authentication and total rock mineral analysis, the fourth step of classifying the shales according to the four-component three-end-member principle, and the last step of classifying the shales and conducting reasonable simplification through a core macroscopic structure and rock type combined method. The shale classification method is applicable to laboratory studies and outside work, is a method with reasonable logic and high operability for classification of the shales, solves the problems that the shale classification methods are varied and the organic matter components are ignored, and can be used for studying formation causes of the shales conveniently and guiding field logging and fracturing transformation.

Description

technical field [0001] The invention relates to the geological field of petroleum exploration and development, in particular to a method for classifying mud shale. Background technique [0002] At present, with the rapid development of unconventional oil and gas exploration and development, the classification of shale has recently become popular. Why shale classification has become so important can be seen from the fact that shale occupies almost half of the volume of geological research columns. The main reasons are that the understanding of source rocks continues to deepen, global conventional oil and gas exploration has entered a fully mature stage, and the geological reserves of oil and gas in shale are larger than those in conventional oil and gas reservoirs. [0003] A good naming method should be scientific and practical, which can not only reflect the origin of rocks, but also be widely used. The difficulties faced by mudstone nomenclature are as follows: (1) Exist...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V9/00
Inventor 董春梅马存飞林承焰张宪国
Owner 董春梅
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