Logging information-based lithotype determining method

A technology for determining methods and logging data, which is applied in earth-moving drilling, wellbore/well components, etc. It can solve the problem of high cost of core extraction, inability to determine the type of coal and rock, affecting the design of CBM development plans and the implementation of measures, etc. problem, to make up for the high cost and the effect of continuous identification

Inactive Publication Date: 2014-05-07
YANSHAN UNIV
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Problems solved by technology

The method of coring observation is more accurate, but the cost of taking cores is very high. In a mining area, only a few wells take cores, and most of the wells do not take cores. Therefore, the type of coal rock cannot be determined for wells that do not take cores, which affects coalbed methane. Design of development programs and implementation of measures

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  • Logging information-based lithotype determining method
  • Logging information-based lithotype determining method
  • Logging information-based lithotype determining method

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Embodiment Construction

[0014] The implementation of the present invention divides three steps:

[0015] (1) Determination of logging response relationship of coal and rock and establishment of classification standards

[0016] Due to the different types of coal rocks, different industrial components and different physical properties, there are also large differences in the response relationship to logging.

[0017] According to the observation of a large number of coal rock data and the analysis and summary of experimental data, there are great differences in the physical properties of different types of coal rock. Bright coal has strong luster, high brittleness, low mechanical strength, easy to break, developed endogenous cracks, low density, low ash content and high gas content. Semi-bright coal has high brittleness, low mechanical strength, and is easy to break. The endogenous cracks are more developed, the density is low, and the ash content is low. Compared with bright coal, its structure is n...

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Abstract

The invention relates to a logging information-based lithotype determining method, which is characterized by comprising the steps of respectively collecting the parameter data of a coring well and an unknown well; selecting a compensated density logging curve, a compensated sound wave time difference logging curve, a compensated neutron logging curve and a borehole diameter logging curve, which are sensitive to lithotypes as basic parameters, counting the electrical parameter distribution intervals of different lithotypes by the true depth determination of core of the coring well, establishing a coal and rock logging classifying standard and a coal and rock identification plate, and determining the lithotype of the unknown well by adopting a plate method or a gray correlation statistical method. The logging information-based lithotype determining method has the advantages of solving the difficult problem that the lithotype can be determined by only rock coring, offsetting the defect that the cost for lithotype determining through naked eye observation is high, and realizing the fast and continuous identification on the lithotypes under the condition that a coal-bed gas well is not subjected to rock coring.

Description

technical field [0001] The invention belongs to the fields of coalfield exploration and coalbed methane exploration and development, and in particular relates to a coal rock type determination method based on logging data. Background technique [0002] Coal rocks can usually be divided into four types: bright coal, semi-bright coal, semi-dark coal and dull coal. Different types of coal rocks have different coal quality, different physical properties, porosity, permeability, and gas content. Gas production is different. Therefore, the identification of coal rock types is an important basic work in the process of coalbed methane exploration and development. [0003] At this stage, the identification of coal rock types is mainly through drilling core data or sampling through coal mine tunnels and visual observation. The method of coring observation is more accurate, but the cost of taking cores is very high. In a mining area, only a few wells take cores, and most of the wells...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00
Inventor 邵先杰
Owner YANSHAN UNIV
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