Method for determining improved shale brittleness index based on mineral composition

A technology of brittleness index and determination method, which is applied in the field of geological exploration and can solve the problem of double action that cannot reflect the compressibility of shale.

Inactive Publication Date: 2019-12-20
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

[0009] The purpose of the present invention is to reflect the dual effects of carbonate minerals on shale compressibility and improve the accuracy of shale brittleness index; propose an improved method for determining shale brittlene

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  • Method for determining improved shale brittleness index based on mineral composition
  • Method for determining improved shale brittleness index based on mineral composition
  • Method for determining improved shale brittleness index based on mineral composition

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[0040] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0041]The embodiment of the present invention provides an improved method for determining the shale brittleness index based on mineral composition, referring to figure 1 shown, including:

[0042] S11. Identify the type of kerogen in the shale to be tested through the kerogen microscope; the type of kerogen is type I, type II, and type III;

[0043] S12. Determine the total organic carbon content W in the shale by organic carbon a...

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Abstract

The invention discloses a method for determining an improved shale brittleness index based on mineral composition. The method comprises the steps of: identifying a kerogen type in to-be-tested shale through a kerogen mirror, and determining a total content Wo of organic carbon in the shale by organic carbon analysis; calculating a volume fraction Vo of an organic matter, and then figuring out a volume content Voganic of the organic matter; and determining the content Wflesic of femic minerals, the content Wcarbanate of carbonate minerals, the content Wclay of clay minerals and a total sum Vimof inorganic minerals in the shale through X-ray diffraction total rock mineral analysis, performing normalization processing to obtain the volume content Vcarbonate of the carbonate minerals, the volume content Vflicec of the femic minerals and the volume content Vcarbonate of the clay minerals, and calculating the improved shale brittleness index Brit based on mineral composition. By adopting the method, the dual effect of the carbonate minerals on the compressibility of the shale can not only reflected, and the accuracy of the shale brittleness index is also improved.

Description

technical field [0001] The invention relates to the technical field of geological exploration, in particular to an improved method for determining shale brittleness index based on mineral composition. Background technique [0002] The mineral composition of rocks has a great influence on the transformation of shale. There are three traditional calculation methods for shale brittleness index based on mineral composition: [0003] (1)B rit =V quartz / (V quartz +V carbonate )*100, [0004] (2)B rit =V felsic / (V felsic +V carbonate )*100, [0005] (3)B rit =(V felsic +V carbonate ) / (V felsic +V carbonate +V clay )*100. [0006] Carbonate minerals have dual effects on shale compressibility, that is, a certain amount of carbonate minerals can increase brittleness, while excessive carbonate minerals lead to increased strength and fracture toughness, which is not conducive to reformation, which is different from the actual fracturing During the fracturing process, ...

Claims

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Application Information

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IPC IPC(8): G01N23/207G01N23/2005G01N21/84G01V11/00
CPCG01N21/84G01N23/2005G01N23/207G01V11/00
Inventor 马存飞蒲秀刚韩文中杜争利
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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