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Speed splicing method and system for pre-stack depth offset

A pre-stack depth migration and depth migration technology, applied in the field of seismic exploration, can solve problems such as difficulty in applying shallow velocity changes

Inactive Publication Date: 2018-04-03
CHINA PETROLEUM & CHEM CORP +1
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  • Description
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  • Application Information

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Problems solved by technology

[0003] The inventors found that the existing technology is difficult to apply to seismic work areas with large shallow velocity changes, complex underground structures, or high requirements for imaging depth errors

Method used

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  • Speed splicing method and system for pre-stack depth offset
  • Speed splicing method and system for pre-stack depth offset

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Embodiment approach 1

[0016] figure 1 A flowchart showing the steps of the velocity stitching method for prestack depth migration according to the present invention.

[0017] In this embodiment, the velocity mosaic method for prestack depth migration according to the present invention may include: step 101, based on seismic data, obtain first arrival observation travel time, initial velocity model and deep velocity model; step 102, based on Obtain the shallow velocity model through grid tomographic inversion with the travel time of the first arrival observation and the initial velocity model; step 103, obtain the bottom interface of velocity inversion based on the shallow velocity model; step 104, based on the deep velocity model, the shallow The layer velocity model and the bottom interface are obtained to obtain a depth migration velocity model; and step 105, based on the depth migration velocity model, pre-stack depth migration is performed to obtain a pre-stack depth migration result.

[0018]...

Embodiment approach 2

[0045] According to an embodiment of the present invention, a velocity mosaic system for prestack depth migration is provided, and the system may include: a method for obtaining travel time of first arrival observation, initial velocity model and deep velocity model based on seismic data unit; the unit used to obtain the shallow velocity model through grid tomographic inversion based on the travel time of the first arrival wave observation and the initial velocity model; the unit used to obtain the bottom interface of the velocity inversion based on the shallow velocity model; A unit for obtaining a depth migration velocity model based on a deep velocity model, a shallow velocity model, and a bottom interface; and a unit for performing prestack depth migration based on a depth migration velocity model to obtain prestack depth migration results.

[0046] In this embodiment, high-precision pre-stack depth migration imaging is realized by splicing the shallow velocity model from g...

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Abstract

The invention discloses a speed splicing method and a speed splicing system for pre-stack depth offset. The method comprises the steps of based on seismic data, acquiring an observation travel time ofa preliminary wave, an initial speed model and a deep-layer speed model; based on the observation travel time of the preliminary wave and the initial speed model, obtaining a shallow-layer speed model through the grid tomographic inversion process; based on the shallow-layer speed model, obtaining the bottom boundary of the speed inversion; based on the deep-layer speed model, the shallow-layer speed model and the bottom boundary of the speed inversion, obtaining a depth offset speed model; performing the pre-stack depth offset based on the depth offset speed model, and obtaining a pre-stackdepth offset result. According to the invention, the shallow-layer speed model obtained through the grid tomographic inversion process and the deep-layer speed model obtained through the pre-stack time offset process are spliced, so that the high-precision pre-stack depth offset imaging is achieved.

Description

technical field [0001] The present invention relates to the field of seismic exploration, more specifically, to a velocity stitching method and system for pre-stack depth migration. Background technique [0002] In the field of seismic exploration, pre-stack depth migration technology has gradually become a routine processing process due to its small well seismic error and high migration imaging quality. The quality of prestack depth migration depends on the accuracy and fineness of the velocity model. Therefore, velocity modeling is the core step of the entire prestack depth migration process, especially if the shallow velocity is not established accurately, the error will be large. Accumulated to deep reservoirs, affecting imaging quality and accuracy. Prior to pre-stack depth migration, the influence of shallow velocity on seismic data is eliminated to a certain extent through time-domain static correction, that is, seismic data is corrected to the floating datum, and th...

Claims

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Application Information

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IPC IPC(8): G01V1/28
CPCG01V1/282
Inventor 刘小民邬达理梁硕博李晶晶穆洁徐春梅
Owner CHINA PETROLEUM & CHEM CORP
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