A Method for Determining Coal Body Structure of Coal Seam

A coal body and coal seam technology, applied in the field of coalbed methane reservoir evaluation, can solve problems such as lack of coal body structure division standards, lack of universality, etc.

Active Publication Date: 2020-08-07
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

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  • A Method for Determining Coal Body Structure of Coal Seam
  • A Method for Determining Coal Body Structure of Coal Seam
  • A Method for Determining Coal Body Structure of Coal Seam

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Embodiment Construction

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

[0052] The method for determining the coal body structure of the coal seam in the present invention comprises firstly discriminating the coal body structure of the coal core, constructing the coal body structure factor by using conventional logging data, and determining the division standard of the coal body structure factor by combining the coring analysis results, and finally using the measured The well data can be used to continuously distinguish the coal structure of the coal seam. The invention realizes the method of constructing coal body structure factors by using conventional well logging data and continuously distinguishing coal seam coal body structure in the coal bed methane reservoir. This method quantitatively judges the coal seam structure with high accuracy, basically meets the n...

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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 coal seam gas reservoirs, in particular to a method for determining the structure of coal seams. Background technique [0002] Coal bodies with different structures develop different fracture systems, which directly affect factors such as coal seam permeability, gas content, and pulverized coal output. At the same time, in a minefield or a small-scale block, the geological development history of the coal reservoir is similar, the temperature, pressure, and stress of the reservoir at a certain stage are similar, and there is no obvious boundary inside the minefield or block, then the coal deformation Depends on the rock mass structure of the 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 cracks; wh...

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Application Information

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Patent Type & AuthorityPatents(China)
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
OwnerBC P INC CHINA NAT PETROLEUM CORP