Joint imaging method of primaries and internal multiples
QIN Ning1, WANG Changbo1, LIANG Hong-xian1, LI Zhina2, LI Zhenchun2, DING Yixuan2
1. Shengli Geophysical Research Institute of SI-NOPEC, Dongying, Shandong 257022 China; 2. School of Geosciences, China University of Petroleum (East China), Qingdao, Shandong 266580, China
Abstract：The internal multiples generated by strong reflection interfaces have bothered the oil and gas exploration for a long time because of their complicated propagation paths and high costs in difficult suppression. Since internal multiples are also real reflections from the underground interfaces and reverse time migration can realize the imaging of multiples, a joint imaging method of primaries and internal multiples is studied to reduce calculation cost and improve imaging accuracy. First, the imaging conditions based on the separation of up-going and down-going wavefields are introduced by analyzing the joint imaging process to improve imaging accuracy. Then, the generation mechanism of crosstalk artifacts that are introduced in the joint imaging process is analyzed, and the corresponding solution based on missing boundary matching and compensation is put forward. The matching factor is obtained by matching the upper boundary of forward-extrapolation with the real seismic data and then employed to the forward-extrapolation boun-daries to compensate for the missing boundaries. As a result, the fidelity of reverse time extrapolation is realized, which can effectively avoid the crosstalk artifacts. Finally, the feasibility, effectiveness, and applicability of the method are verified by numerical tests.
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