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High precision prestack depth migration method

A pre-stack depth migration, high-precision technology, applied in seismic signal processing and other directions, which can solve problems such as limitation, dispersion angle, and large amount of calculation.

Active Publication Date: 2010-09-22
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

The FFD method can adapt to relatively severe lateral speed changes. When dealing with three-dimensional problems, the method of multi-directional splitting is used. However, the finer the splitting direction, the greater the amount of calculation, and it requires a large memory. It also has the problems of dispersion and angle limitations. Higher cost of application in production

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specific Embodiment approach

[0031] 1) From the seismic data collected in the field, through a series of conventional preprocessing procedures, the pre-stack shot data on the unified datum is obtained;

[0032] 2) Determine the continuation step size according to the complexity of the seismic data. Generally speaking, the more complex the seismic data, the smaller the continuation step should be. If the seismic data collected in the field is relatively simple, the continuation step can be 10 times the usual continuation step, and if the seismic data is very complex, in order to ensure imaging accuracy, the continuation step can generally be 5 times the usual step.

[0033] 3) Partition the velocity field;

[0034] First determine the number n of partitions according to the severity of the lateral change of the velocity field, and then pass the maximum velocity v of each extension layer max and the minimum velocity v min Find the critical speed of each partition, n speed partitions have a total of n+1 c...

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Abstract

The utility model relates to a high precision prestack depth migration method in the oil exploration reflected wave earthquake data processing process. The method comprises the following steps: prestack shot gather data on the unified datum plane is collected, continuation step length is determined, a velocity field is divided into small velocity areas, a wave field is extended through a split-step Fourier method according to the large step length in each small velocity field, 5 the wave fields of the velocity areas obtained after the continuation in different areas are merged according to the actual corresponding net point, smooth filter processing is carried out, the whole wave field after the continuation is obtained, linear phase shift interpolation is carried out on the two adjacent waves fields and each wave field in the middle which is extended according to the small continuation step length is obtained. The invention forms images according to the cross-correlation imaging principle, obtains the prestack depth shift result, displays the shift result to stratigraphic section images, obviously improves the imaging quality of complex geologic structure and has low cost.

Description

technical field [0001] The present invention relates to the pre-stack migration imaging technology in the process of petroleum exploration reflection wave seismic data processing, specifically a high-precision pre-stack depth migration imaging technology based on velocity partition and linear phase shift wavefield interpolation under complex geological structures. shift method. Background technique [0002] In the imaging of complex geological structures in the process of oil exploration reflection wave seismic data processing, the wave equation prestack depth migration method has been more and more widely used, and it can naturally solve the multipath problem of waves propagating in complex formations. Significantly improved imaging quality of complex structures. Split-step Fourier method (SSF) and Fourier finite difference method (FFD) are typical algorithms for wave equation prestack depth migration. The SSF method can adapt to slow lateral speed changes, but the SSF me...

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Application Information

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IPC IPC(8): G01V1/28
Inventor 王昌龙王成祥李军茹李桂芳
Owner BC P INC CHINA NAT PETROLEUM CORP
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