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Method for determining coal seam coal structures

A coal body and coal seam technology, which is applied in the field of coalbed methane reservoir evaluation, can solve the problems of lack of versatility, non-uniform coal body structure division standards, and no specific introduction of the division standards.

Active Publication Date: 2017-10-03
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Abstract
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AI Technical Summary

Problems solved by technology

However, there are still at least the following problems: (1) The division standard of coal body structure is not uniform and not universal; Further fusion of various sensitivity curves, and the ability to continuously evaluate coal structure

Method used

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  • Method for determining coal seam coal structures
  • Method for determining coal seam coal structures
  • Method for determining coal seam coal structures

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Embodiment Construction

[0051] The present invention will be further described in detail below in conjunction with specific embodiments, which are for explanation rather than limitation of the present invention.

[0052] The present invention is a method for determining the structure of the coal seam. Firstly, the coal core is determined, the coal structure factor is constructed using conventional logging data, and the coal structure factor division standard is determined by combining the core analysis results, and finally the coal structure factor The well data continuously discriminates the coal structure of the coal seam. The invention realizes a method for constructing coal structure factors using conventional logging data in a coalbed methane reservoir, and continuously discriminating the coalbed coal structure. This method quantitatively distinguishes the structure of coalbed methane, with high accuracy, basically meets the needs of on-site exploration and development, and provides a reliable basi...

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Abstract

The invention provides a method for determining coal seam coal structures. The method is characterized in that technical support is provided for continuous coal seam coal structure type evaluation, coal seam perforation layer selection and permeability evaluation, pulverized coal production and the like. The method specifically includes the steps of firstly, performing coal structure judging on a coal core; secondly, measuring the well logging curve of the corresponding section of the coal core, and performing normalization processing, wherein the well logging curve comprises well diameter CAL, virgin zone resistivity Rt and natural gamma GR; thirdly, building coal structure factors Fcs according the well logging curve after the normalization processing in the second step; fourthly, acquiring the classification standards of the coal structure factors Fcs of different-coal-structure coal seams; fifthly, using well logging information to continuously determine the coal seam coal structures according to the built coal structure judging factors and the classification standards.

Description

Technical field [0001] The invention relates to the field of evaluation of coalbed methane reservoirs, in particular to a method for determining the structure of coalbed methane. Background technique [0002] Different structural coal bodies develop different fracture systems, which directly affect factors such as coal seam permeability, gas content and pulverized coal output. At the same time, within a wellfield or a small block, the geological development history of the coal reservoir is similar. The temperature, pressure, and stress experienced by the reservoir at a certain stage are close, and there is no obvious boundary inside the wellfield or block, then the coal body is deformed Depends on the rock mass structure of coal-bearing rock series. The biggest difference between rock mechanics and rock mechanics is that the rock mass is considered as a whole to discuss its mechanical properties, whether it is a complete rock mass or an incomplete rock mass with joints and crack...

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Application Information

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IPC IPC(8): E21B49/00E21C41/18E21C41/28G06Q50/02
CPCE21B49/00E21C41/18E21C41/28G06Q50/02
Inventor 黄科万金彬熊先钺董彦喜任龙程道解何羽飞王伟邢军赵建斌胡燕婷田扬袁野张丽娜
Owner BC P INC CHINA NAT PETROLEUM CORP
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