Method for correcting expanding influence of coalbed methane reservoir density logging

A technology of density logging and correction method, which is applied in the directions of measurement, earthwork drilling and production, wellbore/well components, etc., and can solve the problems of inconvenient correction and processing

Inactive Publication Date: 2014-05-07
XI'AN PETROLEUM UNIVERSITY
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Problems solved by technology

There is no correction method for the effect of diameter expansion of density logging on coalbed methane reservoirs, which brings inconvenience to the correction of the effect of diameter expansion on density logging of coalbed methane reservoirs

Method used

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  • Method for correcting expanding influence of coalbed methane reservoir density logging
  • Method for correcting expanding influence of coalbed methane reservoir density logging
  • Method for correcting expanding influence of coalbed methane reservoir density logging

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Embodiment Construction

[0040] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0041] refer to figure 1 , a method for correcting the effect of diameter expansion on coalbed methane reservoir density logging, comprising the following steps:

[0042]Step 1. Correlation analysis between coalbed methane reservoir density logging and borehole diameter: divide the coal seam according to the logging curve, and after deducting interlayers such as coal and gangue, calculate the arithmetic average of the density and borehole logging values ​​of the coal seam section according to the number of sampling points , to obtain the density and diameter logging values ​​of each coal seam in a group of different wells, conduct correlation analysis with the diameter as the independent variable and the density logging value as the dependent variable, and find out the mechanism of the influence of diameter expansion on the density logging. ...

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Abstract

The invention discloses a method for correcting expanding influence of coalbed methane reservoir density logging. The method comprises the following steps of 1, analyzing a correlation between the coalbed methane reservoir density logging and a caliper; 2, analyzing a correlation between the coalbed methane reservoir density logging and mud density; 3, constructing a coalbed methane reservoir density logging expanding influence correcting model; 4, calculating satellite surveillance dilution of mud; 5, correcting the expanding influence of the coalbed methane reservoir density logging. Based on a satellite surveillance dilution theory, internal relations of an expanding ratio, the mud density and a density logging value are fully utilized, the coalbed methane reservoir density expanding influence is corrected, the accuracy of correcting the expanding influence of the coalbed methane reservoir density logging is improved and a guarantee is provided for improving prediction accuracy of coalbed gas content density logging.

Description

technical field [0001] The invention belongs to the logging technology in the coalbed gas exploration and development technology, and in particular relates to a method for correcting the diameter expansion effect of the coalbed gas reservoir density logging. Background technique [0002] In order to overcome the problem that it is difficult to correct the diameter expansion effect of coalbed methane reservoir density logging, the object of the present invention is to provide a method for correcting the diameter expansion effect of coalbed gas reservoir density logging. Based on the apparent geometry factor theory, a correction model for the influence of diameter expansion on density logging is established for coalbed methane reservoirs. This model not only reflects the influence of diameter expansion on density logging, but also considers the contribution of mud density to measured density logging values. , so that log analysts can more conveniently correct the effect of den...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00E21B47/08
Inventor 刘之的赵靖舟
Owner XI'AN PETROLEUM UNIVERSITY
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