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Application of Walkaway VSP precise imaging technology
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Walkaway VSP is a geophysical exploration technology which shoots with varying offsets and receives in well, and also a developing and improving seismic technology. This paper focuses on Walkaway VSP precise imaging. After obtaining the fine upgoing wave field by separating, we built the 2D equivalent velocity field first, and then imaged using wave equation method based on wave field extrapolation. In the process of imaging, the conventional wave equation migration method of Walkaway VSP was improved as following: doing 2D migration with 3D algorithm to overcome the problems of spatial aliasing; converting the conventional aperture to the segment of VSP surveying in well to remove the deviation caused by the velocity accuracy. Practice shows that this method works well in practical applications.
Society of Exploration Geophysicists
Title: Application of Walkaway VSP precise imaging technology
Description:
Walkaway VSP is a geophysical exploration technology which shoots with varying offsets and receives in well, and also a developing and improving seismic technology.
This paper focuses on Walkaway VSP precise imaging.
After obtaining the fine upgoing wave field by separating, we built the 2D equivalent velocity field first, and then imaged using wave equation method based on wave field extrapolation.
In the process of imaging, the conventional wave equation migration method of Walkaway VSP was improved as following: doing 2D migration with 3D algorithm to overcome the problems of spatial aliasing; converting the conventional aperture to the segment of VSP surveying in well to remove the deviation caused by the velocity accuracy.
Practice shows that this method works well in practical applications.
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