Abstract
Reverse time migration (RTM) is an accurate migration method, which is based on two-way wave equation, eliminates angle limitation, and can be capable for imaging of reverse branch and multiple. In the development of an oilfield in Pearl River Mouth (PRM) Basin, RTM has been applied to solve the problems of fault shadow and structure in distinction and the drilling has proven that the RTM result is reliable. This paper introduces the theory of RTM and emphatically discusses parameter selection. The results of RTM showed that it had advantages in resolving fault shadow and the imaging of steep dip structure, and could be utilized in the oilfield.
Highlights
At the present stage of seismic prospecting, the most widespread pre-stack depth migration (PSDM) method is the Kirchhoff integration migration based on ray theory and the wave equation migration based on one-way wave equation
Due to the too long elapsed time in Reverse time migration (RTM) tests, this paper considers that migration aperture could be sure by pre-stack Kirchhoff depth migration
RTM is based on two-way wave equation, rids the angle limitation in one-way wave migration imaging, and can 790 image reverse branch and high steep structure
Summary
At the present stage of seismic prospecting, the most widespread pre-stack depth migration (PSDM) method is the Kirchhoff integration migration based on ray theory and the wave equation migration based on one-way wave equation. Since the application of high frequency approximation and single travel time hypothesis, the Kirchhoff PSDM is not suitable for the imaging of complex structure or drastic variable velocity condition. The one-way wave equation PSDM can resolve the complex wave in complex media and multipath problem, and has the advantage of amplitude preservation. Whereas, this method utilizes the one-way wave approximation and the simplified quasi differential equation,. Since the research area is a complex fault block oilfield and develops reservoir-controlling fracture, routine PSDM cannot satisfy the requirement of the steep-dip imaging and RTM has been adopted
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