True surface relief prestack depth domain two-way wave imaging method

An imaging method and true surface technology, applied in the field of seismic exploration, can solve the problems of complex underground structure, complex surface velocity structure, and imaging angle limitation of complex wave field, and achieve the effect of avoiding wave field distortion.

CN102590857AInactive Publication Date: 2012-07-18中国石油集团西北地质研究所有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2012-07-18
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a true surface relief prestack depth domain two-way wave imaging method, which specifically comprises the following steps of: (1) acquiring the true surface elevation of a plane with seismic single-shot data by taking the form of a relief surface datum as a basis; (2) redefining a To value, and correcting a speed model; (3) constructing source wavelets, realizing the forward modeling of a source wave field by adopting an optimized difference method, and applying a true surface boundary condition; and (4) performing regular reverse time extrapolation on recorded data along a time direction, applying the relief surface boundary condition, and performing a seismic wave field correlation to acquire a depth domain seismic image. According to the method, the depth domain wave field extrapolation and imaging of the recorded data on a true surface are realized, so that the shortcomings of wave field distortion and untruthful structural form caused by a high surface elevation difference in the conventional technologies can be overcome, and an accurate seismic image and a true geological structural form can be obtained under a complex surface condition.
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Description

technical field

[0001] The invention relates to the technical field of seismic exploration, in particular to a two-way wave imaging method in the pre-stack depth domain of real surface fluctuations. Background technique

[0002] Prestack seismic imaging is a seismic data processing method proposed in the 1970s, including time-domain imaging technology and depth-domain imaging technology; in depth-domain imaging methods, the methods currently used include integration methods based on ray theory and wave theory-based methods. The differential wave equation one-way wave solution method, these two types of methods are difficult to deal with the problem of high-steep-dip-angle structural imaging where the lateral velocity of seismic waves changes drastically.

[0003] In recent years, a two-way wave imaging method with higher precision has been developed. This method uses two-way waves to solve the differential wave equation, which theoretically makes up for the imaging defects f...

Examples

Embodiment 1

[0051]Seismic recording data with complex surface, complex structure and complex wave field were selected for the test; the surface undulation in the BLH area is relatively large, and the seismic imaging problem in this area is serious due to the complexity of the surface and underground structure, especially for strata with high and steep dip angles greater than 90 degrees The sub-salt structure cannot be imaged, and the sub-salt structure is distorted due to the influence of surface fluctuations and salt dome velocity anomalies; after repeated experiments, the result is that conventional fixed-surface seismic imaging technology cannot solve the problem of accurate imaging in this area. For this reason, we use a two-way wave imaging method in the pre-stack depth domain of true surface relief of the present invention. This method has carried out true surface seismic imaging processing in the BLH Basin. A very good imaging effect has been obtained.

[0052] The two-way wave ima...