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Residual phase correction method based on AVO (amplitude versus offset) abnormal type constraints

A phase correction and anomaly type technology, applied in the field of petroleum geophysical exploration, can solve problems such as loss of effective information in distortion areas, misunderstandings, stretching distortion of large offset traces, etc.

Active Publication Date: 2015-04-01
CHINA PETROLEUM & CHEM CORP +1
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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 (amplitude versus offset) abnormal type constraints
  • Residual phase correction method based on AVO (amplitude versus offset) abnormal type constraints
  • Residual phase correction method based on AVO (amplitude versus offset) abnormal 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, Steps such as routine motion correction to generate usable CMP gathers or CRP gathers;

[0047] (2) Perform Fourier transform on the input CMP / CRP gather, convert it from the time domain to the frequency domain, perform amplitude and phase calculations in the 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: ...

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Abstract

The invention relates to a residual phase correction method based on AVO (amplitude versus offset) abnormal type constraints. The residual phase correction method specifically comprises the following steps of (1) exciting earthquake waves, recording the earthquake waves of a working area, and generating an available CMP (common midpoint) or CRP (common reflection point) gather; (2) performing Fourier conversion on the inputted CMP or CRP gather; (3) performing PMO (phase moveout) correction on the processed CMP or CRP gather; (4) calculating and filtering the phases of the CMP or CRP gather after PMO processing; (5) performing frequency domain PMO correction on the CMP or CRP gather; (6) performing inverse Fourier conversion on the CMP or CRP gather after frequency domain PMO correction; (7) directly outputting the time domain CMP or CRP gather to obtain a time domain PMO gather; (8) applying the outputted time domain PMO gather to AVO analysis and explanation. The residual phase correction method is applied to oil gas detection.

Description

technical field [0001] The present 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 event axes, and provide more reliable basic data for AVO oil and gas detection based on AVO anomaly type constraints. Residual Phase Correction Method. 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 exploration methods for finding resource...

Claims

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Application Information

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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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