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An evaluation method of coal-bearing logging sensitive parameters

An evaluation method and technology of sensitive parameters, applied in earthwork drilling, wellbore/well components, etc., can solve problems such as uncertainty and explanation multi-solution, and achieve the effect of clear relational formula, strong sensitivity and high calculation accuracy

Active Publication Date: 2017-03-15
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

The existence of pores and gas will change the response characteristics of conventional logging, but because a single logging information is affected by many factors, its interpretation is often multi-solution and uncertain

Method used

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  • An evaluation method of coal-bearing logging sensitive parameters
  • An evaluation method of coal-bearing logging sensitive parameters
  • An evaluation method of coal-bearing logging sensitive parameters

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Embodiment Construction

[0043] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0044] Combining or transforming various logging information with little correlation (orthogonal) to extract high-resolution reservoir combination characteristic parameters for analysis of formation lithology, coal quality, etc.; identification and comparison with test data can also be used Analyze and evaluate the gas-bearing property of the reservoir, so as to realize the quick and intuitive interpretation of the coalbed methane reservoir.

[0045] Such as image 3 As shown, the present invention includes:

[0046] (1) Extraction method of coal-bearing characteristic parameters

[0047] When deposited peat is buried and transformed into coal with increasing temperature and pressure, its physical and chemical properties undergo qualitative changes. Different evolution stages correspond to corresponding "coal ranks", and each stage has special attributes. As the c...

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Abstract

The invention provides a coal bearing property logging sensitive parameter evaluating method and belongs to the field of unconventional oil and gas exploration and development. The coal bearing property logging sensitive parameter evaluating method is based on coal core scale logging and comprises extracting and establishing coal bearing property logging rapid evaluation indexes and forming an expository mode by combining natural gamma logging value and density logging value with limetone stratum density logging mean value. The coal bearing property logging sensitive parameter evaluating method achieves rapid and intuitional explanation of gas reservoir of coal seams.

Description

technical field [0001] The invention belongs to the field of unconventional oil and gas exploration and development, and in particular relates to an evaluation method for coal-bearing logging sensitive parameters. Background technique [0002] The most direct method to evaluate the coal-bearing property and gas-bearing property of coalbed methane reservoirs is to drill coal cores, measure the parameters such as core vitrinite reflectance, carbon, hydrogen content and calorific value, and determine the coal rank according to the coal rank division standard; use Analytical method, Airi method, isotherm adsorption line method, Kem method and other methods to obtain the gas content of the reservoir. This is also an essential work for accurate evaluation of coal reservoirs in the early stage of exploration and development of a block, but this method is costly, has discontinuous data, takes a long time, and is inefficient, making it difficult to implement in practice. Well loggin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B49/00
Inventor 张松扬陈利雯龚劲松王晓畅张爱芹李军苏俊磊
Owner CHINA PETROLEUM & CHEM CORP
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