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Depth domain velocity modeling method for piedmont zone seismic data processing

A technology of seismic data and velocity modeling, which can be applied in seismic signal processing, seismology, geophysical measurement, etc., can solve the problems such as the accuracy of the imaging velocity model of high and steep structural migration in the piedmont zone, and achieve good promotion Application prospects, high homing accuracy, and the effect of avoiding the risk of exploration failure

Active Publication Date: 2017-04-26
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0005] The purpose of the present invention is to provide a depth-domain velocity modeling method for seismic data processing in the piedmont zone, so as to solve the problem that the existing technology cannot completely solve the problem of imaging velocity model accuracy of high and steep structural migration in the piedmont zone

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  • Depth domain velocity modeling method for piedmont zone seismic data processing
  • Depth domain velocity modeling method for piedmont zone seismic data processing
  • Depth domain velocity modeling method for piedmont zone seismic data processing

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Embodiment

[0046] An area located in the piedmont zone carries out depth migration processing of 3D seismic data with an area of ​​200Km 2 , the processing task is to improve the imaging accuracy of the high and steep faults at the boundary of the piedmont zone, and provide high-quality seismic sections for finding favorable fault blocks and fault lithology reservoirs in this area.

[0047] The depth-domain velocity modeling method for processing seismic data in the piedmont zone in this embodiment adopts the following steps:

[0048] 1) Accurately pick the RMS velocity of the pre-stack time migration, and use the velocity constrained inversion (cvi) technology to perform local single-point control to make the velocity field converge and smooth; then, use the DIX formula to convert the RMS velocity into the time domain layer velocity, and then perform time-depth conversion on the layer velocity in the time domain to obtain the layer velocity body in the depth domain and perform smoothing p...

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Abstract

The invention relates to a depth domain velocity modeling method for piedmont zone seismic data processing. The method comprises the following steps: 1) velocity constrained inversion is used for local single point control on a prestack time migration root mean square velocity, a time domain layer velocity is converted through a DIX formula, time-depth conversion is then carried out, a depth domain layer velocity volume is obtained and is subjected to smoothing, and a prestack depth migration depth domain initial layer velocity model is obtained; 2) grid chromatography inversion optimization is carried out on a velocity model; 3) the optimized velocity model is used for carrying out prestack depth migration on all data in a work area, a depth domain stacked data volume is obtained, the depth domain stacked data volume can be scaled to the time domain, structural interpretation is carried out on the time domain, and a structural model is obtained; and 4) borehole restraint is used for carrying out chromatography inversion optimization on the structural model. Thus, the piedmont zone high-steep structure depth migration imaging processing depth domain velocity model precision is improved, the piedmont zone high-steep structure migration precision is higher, and the well-to-seismic coincidence degree is improved.

Description

technical field [0001] The invention belongs to the field of seismic data processing, and in particular relates to a solution method for depth domain velocity modeling in the processing stage of depth migration imaging of high and steep structures in piedmont seismic data processing. Background technique [0002] Seismic exploration in the piedmont zone often has the characteristics of complex surface conditions and complex geological structures, which bring great challenges to seismic exploration, mainly in the low signal-to-noise ratio of seismic data, large lateral velocity changes, developed faults, and earthquakes. Imaging is difficult. In the phase of seismic data migration imaging processing, the imaging accuracy of all migration methods depends on the accuracy of the velocity model. However, due to the complexity of seismic exploration in the piedmont zone, it has always been a big problem to establish an accurate velocity model, which affects the imaging accuracy of...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28G01V1/30
CPCG01V1/282G01V1/303G01V2210/6222
Inventor 张高成杨兴圣赵伟商建立
Owner CHINA PETROLEUM & CHEM CORP
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