No 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. R. He et al.there are certain problems in the precise imaging of the steep-dip interface. The RTM based on two-way equation is equipped with the advantages of the above-mentioned two methods, adopts the source and detector wave field continued by full acoustic wave equation, avoids the separation of upgoing and downgoing wave, less approximates wave equation, as a consequence, overcomes the limitation of migration dip angle and migration aperture, and is appropriate for steep-dip imaging and arbitrary velocity-variation medium.Whitmore [1] earliest proposed the RTM concept in the 53rd SEG annual meeting. At that time, due to the limitation of the computing capability in computer, RTM developed slowly. In recent year, with the rapid development of computer technology, RTM received more attention, and acquired much improvement and perfection by many scholars. Since the research area is a complex fault block oilfield and develops reservoir-controlling fracture, therefore, routine PSDM cannot satisfy the requirement of the steep-dip imaging and RTM has been adopted.

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