Fusion processing method and system for repeatedly acquired seismic data

A technology of fusion processing and seismic data, applied in the field of oil and gas geophysical exploration, can solve problems such as lack of clear geophysical meaning, achieve the effect of improving seismic imaging effect, reducing structural artifacts in stitching areas, and improving consistency

Pending Publication Date: 2022-05-03
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This technique is usually used for consistent processing of time-lapse seismic post-stack data, and the method process has no clear geophysical meaning

Method used

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  • Fusion processing method and system for repeatedly acquired seismic data
  • Fusion processing method and system for repeatedly acquired seismic data
  • Fusion processing method and system for repeatedly acquired seismic data

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Embodiment 1

[0035] The purpose of the patent of the present invention is to solve the problem of time difference or weak structural difference between seismic data collected repeatedly at present, and calculate the space-varying time difference between at least two acquisitions due to the change of near-surface conditions based on the near-surface velocity model. And the consistency of the surface is decomposed into the static correction of the shot point and the receiver point.

[0036] Taking the fusion processing that has been repeatedly collected once in a work area as an example, the processing flow realized by the present invention is as follows figure 1 As shown, the method principle and implementation steps are as follows:

[0037] S1. Obtain two collections of data at the same location, and use different physical points to invert the velocity model and calculate the static correction accordingly; distinguish the two collections of data at the same location by different gun statio...

Embodiment 2

[0046] Such as Figure 5 As shown, this embodiment provides a time difference correction system for repeated acquisition of seismic data, including:

[0047] Static correction amount calculation unit: used to obtain two collection data at the same location, and use different physical points to invert the velocity model and calculate the static correction amount accordingly; distinguish the two collection data at the same location by different gun station numbers, so that It has different physical points.

[0048] Unified data arrangement for the two collected data. When the excitation and reception of the two collection records are at the same coordinate position, the position of the shot point and the receiver point are the same during the two collection processes. In order to distinguish the two collection records, we add a digit before the recorded shot detection station number The number of collection times, for example, for the first collection of data, the original 300...

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Abstract

The invention provides a method for fusion processing of repeatedly collected seismic data, and belongs to the field of oil and gas geophysical exploration. The invention provides a fusion processing method for repeatedly acquired seismic data, which comprises the following steps of: S1, acquiring data acquired at the same position for at least two times, inverting a velocity model by using different physical points, and calculating a static correction value according to the velocity model; s2, performing CMP superposition on the corresponding acquisition data by using the static correction value to obtain corresponding CMP superposition data; s3, calculating a relative time difference between the at least two pieces of CMP superposition data by using cross-correlation; s4, applying the relative time difference decomposition to the static correction value in the step S1 to obtain a corrected static correction value; and S5, carrying out superposition fusion on the data acquired for at least two times by using the corrected static correction value. The method has a good application effect in the fields of time-lapse seismic processing, repeated acquisition fusion processing, multi-block contiguous processing and the like.

Description

technical field [0001] The invention belongs to the field of oil and gas geophysical exploration, and in particular relates to a method and system for fusion processing of repeated acquisition seismic data. Background technique [0002] In current earth exploration, fusion processing is to fuse two or more pieces of 3D seismic data (overlapped and acquired in different periods) in the same exploration area for processing. Time-lapse seismic data processing is to simultaneously process successively acquired 3D seismic data (overlapped acquisitions in different periods), and analyze and monitor the dynamic information of oil reservoir exploitation by comparing the subtle attribute changes of successively acquired 3D seismic data processing results . Contiguous processing is to combine multiple pieces of 3D data (acquired adjacently in different periods) together for processing. What these three have in common is that they all need to eliminate the time difference between dat...

Claims

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Application Information

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IPC IPC(8): G01V1/36
CPCG01V1/362G01V2210/53
Inventor 袁刚金东民陈林谦王豆豆杨安琪
Owner CHINA PETROLEUM & CHEM CORP
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