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Method for tomography velocity inversion based on angle domain common imaging gathers under complicated condition

A common imaging point gather and velocity inversion technology, which is applied in seismic signal processing and other directions, can solve problems such as inaccurate inversion results, inability to distinguish reflection events, and errors

Inactive Publication Date: 2012-12-26
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

In the case of poor data quality, it is impossible to distinguish the reflection event, which brings a lot of error and leads to inaccurate inversion results

Method used

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  • Method for tomography velocity inversion based on angle domain common imaging gathers under complicated condition
  • Method for tomography velocity inversion based on angle domain common imaging gathers under complicated condition
  • Method for tomography velocity inversion based on angle domain common imaging gathers under complicated condition

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Embodiment Construction

[0067] Based on the above principle analysis and the strategy of velocity analysis along the layer, the flow of the tomographic velocity inversion method based on the common imaging point gather in the angle domain under complex conditions can be summarized as follows:

[0068] (a) The velocity model obtained by conventional velocity analysis is used as the initial velocity model, and the common image point gather in the angle domain is extracted based on the double square root continuation prestack depth migration method.

[0069] (b) Pick the remaining depth difference from the extracted common imaging point gather in the angle domain, and calculate the travel time residual.

[0070] (c) Pick the horizon interface on the migration section, establish the reference velocity model required for ray tracing forward modeling, and then use the ray tracing method of the undulating surface to obtain the sensitivity matrix.

[0071] (d) The travel time residual and the sensitivity mat...

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Abstract

The invention provides a method for tomography velocity inversion based on angle domain common imaging gathers under a complicated condition. The method comprises the following steps of: by using a velocity model obtained by common velocity analysis as an initial velocity model, extracting the angle domain common imaging gathers based on a double-square-root continuation pre-stack depth migration method; picking a rest depth difference on the extracted angle domain common imaging gathers, and calculating a travel residual; picking a horizon interface on a migration section surface, building a reference velocity model needed by the ray-tracing forward, calculating a sensitivity matrix by using an undulating surface ray tracing method; creating an inversion equation set to which a regularization factor is added by using the travel residual and the sensitivity matrix; solving the equation set by using an LSQR (Least-squares QR decomposition algorithm) and updating the velocity model; and extracting the angle domain common imaging gathers by using the updated velocity model based on the double-square-root continuation pre-stack depth migration method.

Description

technical field [0001] The invention belongs to the field of seismic data processing and inversion, and is an accurate velocity inversion and modeling method suitable for complex structural regions in carbonate exploration areas. Background technique [0002] With the continuous expansion of energy demand, conventional exploration and development can no longer meet the growing demand for oil and gas, and the exploration of unconventional oil and gas reservoirs has become a hot and difficult issue in exploration geophysics research. Marine carbonate exploration areas have complex surfaces, steep underground structures, extremely deep target reflectors, and complex reservoirs. These characteristics make the accuracy of conventional processing methods suitable for clastic rock exploration areas based on the assumption of horizontal layers limited. In order to improve the accuracy of imaging and velocity inversion, corresponding imaging and velocity inversion methods are urgent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28G01V1/30
Inventor 李振春张凯秦宁
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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