Residual Phase Correction Method Based on AVO Anomaly Type Constraints

A phase correction, anomaly type technology, applied in the field of petroleum geophysical exploration, can solve the problems of large offset trace stretching distortion, loss of effective information in the distortion area, misunderstanding, etc., to achieve the effect of eliminating the remaining time difference

Active Publication Date: 2018-05-08
CHINA PETROLEUM & CHEM CORP +1
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AI Technical Summary

Problems solved by technology

[0006] In addition, conventional dynamic correction methods will produce stretching distortion for large offset traces, leading to misunderstandings in the interpretation of AVO data
At present, the simple way to solve the dynamic correction stretching distortion is to cut off the distortion area, but this will lose a lot of effective information in the distortion area

Method used

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  • Residual Phase Correction Method Based on AVO Anomaly Type Constraints
  • Residual Phase Correction Method Based on AVO Anomaly Type Constraints
  • Residual Phase Correction Method Based on AVO Anomaly Type Constraints

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Embodiment 1

[0045] A residual phase correction method based on AVO anomaly type constraints, the specific steps include:

[0046] (1) Excite seismic waves and record seismic waves in the work area, and perform preliminary basic processing on the recorded seismic data according to the conventional seismic data processing flow, including data decompilation, denoising, amplitude compensation, velocity analysis, suppression of multiple waves, pre-stack time migration, Conventional dynamic correction steps to generate usable CMP gathers or CRP gathers;

[0047] (2) Perform Fourier transform on the input CMP / CRP gather, convert it from time domain to frequency domain, perform amplitude and phase calculation in frequency domain, and perform noise removal processing on the amplitude spectrum;

[0048] (3) Perform phase motion correction PMO on the processed CMP / CRP gathers, as follows:

[0049] For a seismic trace time series s(t) after motion correction, it can be written as:

[0050]

[00...

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Abstract

The present invention relates to a residual phase correction method based on AVO anomaly type constraints. The specific steps include: (1) exciting seismic waves and recording seismic waves in the work area to generate usable CMP gathers or CRP gathers; (2) inputting CMP / Perform Fourier transform on the CRP gather; (3) Perform phase motion correction on the processed CMP / CRP gather; (4) Perform phase statistics and phase filtering on the CMP / CRP gather after phase motion correction; ( 5) Perform frequency-domain PMO correction on the CMP / CRP gather, (6) perform inverse Fourier transform on the CMP / CRP gather that has completed the frequency-domain PMO correction; (7) directly output the CMP / CRP gather in the time domain Obtain time-domain PMO gathers; (8) apply the output time-domain PMO gathers to AVO analysis and interpretation, and to oil and gas detection.

Description

technical field [0001] The invention relates to the technical field of petroleum geophysical exploration, and is applied to seismic data volumes to eliminate residual time differences on gathers, level events, eliminate residual time differences on gathers, and provide more reliable basic data for AVO oil and gas detection. A Residual Phase Correction Method Based on AVO Anomaly Type Constraints. Background technique [0002] Seismic exploration is to excite seismic waves artificially (explosives, vibrators, air guns, etc.), and use single-component or multi-component sensors to record the vibration of the underground medium in a certain way on the surface or underground. , Vibration intensity, frequency, phase, waveform, etc. will change with the properties of the medium and the geometry of the interface. By processing and analyzing the seismic data recorded by the sensor, the properties of the underground medium and the geological structure can be obtained. Geophysical ex...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/36
Inventor 陈茂根刘苗汪鹏朱立新赵秀莲
Owner CHINA PETROLEUM & CHEM CORP
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