Coalfield well logging curve standardization method

A logging curve and coal field technology, applied in surveying, earthwork drilling, wellbore/well components, etc., can solve problems such as unsatisfactory standardization of logging curves, inability to truly reflect the data distribution range, etc. Guaranteed correctness

Inactive Publication Date: 2017-11-14
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Abstract
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Problems solved by technology

Moreover, the conventional logging curve standardization method can only normalize the logging data to the same range as a whole, but due to the extreme values ​​in the logging data, the normalized logging curve cannot truly reflect the distribution range of the data, resulting in inconsistent standardization of the logging curve. ideal

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  • Coalfield well logging curve standardization method
  • Coalfield well logging curve standardization method
  • Coalfield well logging curve standardization method

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Embodiment Construction

[0027] The technical solutions and technical effects of the present invention will be described in detail below in conjunction with specific examples, but the scope of the present invention is not limited to the following specific examples.

[0028] A total of 61 boreholes have been collected in the DWP work area, of which 43 wells contain density velocity, natural gamma ray and apparent resistivity curves, which can be used for inversion, and the logging curves of the remaining boreholes are incomplete.

[0029] In order to eliminate the errors caused by various reasons such as instrument collection and improve the accuracy of the inversion results, it is necessary to standardize the density curves, natural gamma ray curves and apparent resistivity curves of these 43 boreholes. It is generally believed that the same standard layer at different well points should have similar or regularly changing logging responses, and the extreme values ​​determined according to the frequency...

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Abstract

The invention discloses a coalfield well logging curve standardization method, comprising a step of performing standardization on a coalfield well logging curve by a frequency histogram method, wherein the well logging curve of a coalfield work area is analyzed firstly, and a standard well is selected from wells subjected to logging in the coalfield work area; then, a standard stratum is selected from strata subjected to logging research in the coalfield work area; then, well logging data are respectively analyzed through the frequency histogram method; finally, coalfield well logging curve standardization is performed by using a standardization formula. After the step, a standardized well logging curve is obtained, thus providing high-quality well logging data for follow-up work such as inverting.

Description

technical field [0001] The invention relates to the technical field of a method for standardizing coalfield logging curves, in particular to a method for standardizing coalfield logging curves by using a frequency histogram method. Background technique [0002] Well logging curves can indirectly reflect the lithology information of subsurface media. However, in actual work, due to the influence of factors such as mud, borehole diameter, and instruments, if these original logging curves are directly used for operations such as seismic data inversion, it is inevitable It will affect the quality of the inversion results, so it is necessary to preprocess the logging curves to eliminate the influence of non-geological factors, so that the logging data can truly reflect the geological characteristics and provide more reliable logging data for seismic inversion. In the standardization process of coalfield logging curves, the thickness of the selected standard layer is usually relat...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00E21B47/00
CPCE21B47/00E21B49/00
Inventor 师素珍郭家成谷剑英刘笑颜
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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