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Method for carrying out substratum correlation for logging curve by using wavelet pair of Mexico cap

A technology of logging curves and layer comparison, which is applied in the fields of electrical/magnetic detection for logging records, re-radiation of sound waves, radio wave measurement systems, etc. give comparative information, etc.

Inactive Publication Date: 2009-05-27
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Abstract
  • Description
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Problems solved by technology

These methods require more geological prior information, cannot give comparative information at a certain point, and are not convenient to apply

Method used

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  • Method for carrying out substratum correlation for logging curve by using wavelet pair of Mexico cap
  • Method for carrying out substratum correlation for logging curve by using wavelet pair of Mexico cap
  • Method for carrying out substratum correlation for logging curve by using wavelet pair of Mexico cap

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Embodiment Construction

[0039] The method of the present invention is described in detail below in conjunction with accompanying drawing:

[0040] The spontaneous potential curves of two wells are selected as well logging curves, and they are sampled at certain intervals. The sampling at different intervals reflects the different morphological characteristics of the curves. The log curve is firstly subjected to Fourier transform to obtain the frequency distribution range of the two curves [f min , f max ], according to this frequency range discrete wavelet transform scale factor:

[0041]

[0042]

[0043] The Mexican hat wavelet is defined as:

[0044] Ψ ( t ) = 2 3 π 1 / 4 ( 1 - t 2 ) ...

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Abstract

The invention relates to a method to take member contrast to well logging by using Mexico cap wavelet that includes the following steps: taking sampling to the well logging, and taking spectral analysis to the well logging to gain the frequency distribution range, calculating the range of wavelet transformation size factor and straggling the factor in the range, taking Mexico cap wavelet transformation to the well logging to gain the transformation curve under different size, taking partition to the low frequency section curve and using the thickness as relative contrast length, finding the corresponding point and removing the crossing link contrast point, the rest contrast point is the member contrasting result. The invention could take member contrasting under not abundant the prior information situation.

Description

technical field [0001] The invention relates to a method for sublayer comparison of logging curves by using Mexican hat wavelet. Background technique [0002] At present, the well-known log curve sublayer comparison requires more geological prior information, which is based on extracting formation attribute characteristics (lithological characteristics, thickness characteristics, position characteristics, curve shape characteristics, adjacent layer characteristics, etc.), and then using dynamic Planning method, pattern recognition method, neural network method, gray comparison method, fuzzy clustering method, expert system analysis method and so on. These methods require a lot of geological prior information, cannot give comparative information at a certain point, and are not convenient to apply. Contents of the invention [0003] The purpose of the present invention is to perform well logging curve sublayer correlation without geological prior information or less prior i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V3/18G01V3/38
Inventor 曹思远张凤君周鹏李国福韩瑞冬
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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