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High-precision time-depth correction method based on time-frequency spectrum constraints

A correction method and time-spectrum technology, applied in the field of geophysical exploration seismic interpretation and comprehensive research, can solve the problems of low resolution and low time-depth calibration accuracy, and achieve the effect of ensuring consistency and improving accuracy

Inactive Publication Date: 2016-03-30
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0004] The purpose of the present invention is to address the deficiencies of the prior art, provide a high-precision time-depth correction method based on time-spectrum constraints, and solve the problem of low time-depth calibration accuracy due to the low resolution of conventional synthetic records

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  • High-precision time-depth correction method based on time-frequency spectrum constraints

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Embodiment Construction

[0028] The present invention will be described in further detail below in conjunction with the accompanying drawings:

[0029] The present invention provides a high-precision time-depth correction method and device based on time-frequency spectrum constraints, with reference to figure 1 , The specific implementation steps are as follows:

[0030] (1) Obtain seismic data and sonic logging data for time-depth correction through data acquisition, and determine the depth range of the well data.

[0031] (2) Through wavelet extraction and reflection coefficient calculation, the seismic synthetic record can be obtained, and the obtained synthetic record can be calibrated by the comprehensive calibration system to obtain the initial time-depth relationship. image 3 Record initial calibration results for synthesis.

[0032] (3) Calculate the time-frequency spectrum of seismic and logging data through time-frequency spectrum calculation, and adjust the sampling rate of the logging time spectru...

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Abstract

The invention provides a high-precision time-depth correction method based on time-frequency spectrum constraints. The high-precision time-depth correction method comprises the steps of: acquiring seismic data and acoustic logging data used for time-depth correction; acquiring a seismic synthetic recording trace through wavelet extraction and reflection coefficient calculation, and calibrating the seismic synthetic recording trace in a comprehensive calibration system; respectively calculating time-frequency spectra of the seismic and logging data, and displaying synthetic seismic record, cross-well seismic trace data as well as seismic and logging time-frequency spectra in the comprehensive calibration system; comparing a logging time-frequency spectrum interface with a seismic time-frequency spectrum interface and finely adjusting the interfaces under horizon constraint, and meeting the requirement of seismic synthetic record calibration and time-frequency spectrum interface matching; and finally, saving or outputting a time-depth relationship after completing the calibration. The high-precision time-depth correction method utilizes time interface features such as time-frequency spectra of logging and seismic data, organically combines the seismic synthetic record calibration method and the time-frequency spectrum calibration method, and effectively increases logging and seismic time-depth calibration precision.

Description

technical field [0001] The invention relates to the field of geophysical prospecting seismic interpretation and comprehensive research, in particular to a high-precision time-depth correction method. Background technique [0002] In the seismic interpretation and comprehensive research of geophysical exploration, seismic and logging data are the two most commonly used basic data, and they usually belong to the time domain and depth domain respectively. Well logging data can obtain relatively fine and reliable geological information, while seismic data has the continuity of lateral extrapolation and has more spatial distribution characteristics. The combination of the two requires time-to-depth conversion or deep-time conversion to achieve. [0003] Time-depth conversion is a necessary processing step to convert seismic data from time-domain signals to depth-domain signals, and is a very critical link in structural interpretation using seismic data. At present, the most com...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/36
Inventor 朱剑兵赵庆国李长红王兴谋
Owner CHINA PETROLEUM & CHEM CORP
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