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
CN107870352AInactive Publication Date: 2018-04-03CHINA PETROLEUM & CHEM CORP +1
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Patent Information

Authority / Receiving Office
CN Β· China
Current Assignee / Owner
CHINA PETROLEUM & CHEM CORP
Publication Date
2018-04-03
Estimated Expiration
Not applicable Β· inactive patent

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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.
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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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