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Method for predicting brittle mineral content in gas reservoir layer of shale

A technology of brittle minerals and prediction methods, applied in the field of oil and gas geophysical exploration, can solve the problem that the brittleness index cannot effectively describe the brittleness of shale

Active Publication Date: 2017-04-19
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0013] The purpose of this disclosure is to solve the problem that the brittleness index calculated indirectly based on Young's modulus and Poisson's ratio cannot effectively describe the brittleness of shale, and to provide a direct inversion method for brittle mineral content in shale gas reservoirs, so as to analyze the brittleness of shale More accurate and reliable prediction of shale gas reservoir brittleness based on mineral content

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  • Method for predicting brittle mineral content in gas reservoir layer of shale
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  • Method for predicting brittle mineral content in gas reservoir layer of shale

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[0040] Preferred embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although preferred 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 to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0041] The present invention is based on the depth domain logging data Well(z) (z represents the depth domain, the unit is m) and the pre-stack time domain seismic data Seis(x, y, t) (x, y represents the spatial position corresponding to each seismic trace Coordinates, which can be x, y coordinates, or vertical and horizontal line numbers, t represents the time domain, and the unit is s or ms), the brittle mineral content of shale gas reserv...

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Abstract

The invention provides a method for predicting a brittle mineral content in a gas reservoir layer of shale. The method comprises: carrying out pre-stack elastic parametric inversion; on the basis of log data, calculating a brittleness index logging curve; constructing anisotropic rock physical model of a gas reservoir layer of shale; and on the basis of a pre-stack elastic parametric inversion result and the anisotropic rock physical model of the gas reservoir layer of shale, carrying out inversion of a brittle mineral content of the gas reservoir layer of shale. Therefore, a problem that the conventional brittleness index indirectly calculated based on the Young modulus and Poisson's ratio can not describe the brittleness of the shale effectively can be solved. The invention provides a direct inversion method for a brittle mineral content in a gas reservoir layer of shale, so that the brittleness of the gas reservoir layer of shale can be predicted accurately and reliably based on the brittle mineral content of the shale.

Description

technical field [0001] The present disclosure relates to the field of oil and gas geophysical exploration, and in particular to a method for predicting the content of brittle minerals in shale gas reservoirs. Background technique [0002] In the early stage of shale gas development in North America, the main exploration targets were zones with relatively developed natural fractures. With the development of well completion technology and the improvement of horizontal well fracturing technology, people realize that it is extremely important to effectively stimulate shale reservoirs. Due to the low permeability of shale, the most effective way to increase shale gas production is to use artificial fracturing to connect natural fractures or matrix pores. The successful stimulation measures depend on whether the rock mechanical brittleness of the formation can produce a large number of induced fractures, and easy fracturing is a necessary condition for the economical exploitation...

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Application Information

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IPC IPC(8): G01V1/28G01V1/30
CPCG01V1/282G01V1/30
Inventor 杨丽刘东方胡华锋蔡瑞滕龙毕进娜
Owner CHINA PETROLEUM & CHEM CORP
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