Seismic acquisition parameters analysis for deep weak reflectors in the South Yellow Sea

详细信息    查看全文

• 作者：Kai Liu ; Huaishan Liu ; Zhiqiang Wu ; Long Yue
• 关键词：Key wordsSouth Yellow Sea ; multi ; level air ; gun array ; wide ; angle seismic reflection ; high ; velocity shielded layer ; seismic acquisition parameters
• 刊名：Journal of Ocean University of China
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：15
• 期：5
• 页码：758-766
• 全文大小：1,042 KB
• 刊物主题：Oceanography; Meteorology;
• 出版者：Springer Berlin Heidelberg
• ISSN：1993-5021
• 卷排序：15

文摘

The Mesozoic-Paleozoic marine residual basin in the South Yellow Sea (SYS) is a significant deep potential hydrocarbon reservoir. However, the imaging of the deep prospecting target is quite challenging due to the specific seismic-geological conditions. In the Central and Wunansha Uplifts, the penetration of the seismic wavefield is limited by the shallow high-velocity layers (HVLs) and the weak reflections in the deep carbonate rocks. With the conventional marine seismic acquisition technique, the deep weak reflection is difficult to image and identify. In this paper, we could confirm through numerical simulation that the combination of multi-level air-gun array and extended cable used in the seismic acquisition is crucial for improving the imaging quality. Based on the velocity model derived from the geological interpretation, we performed two-dimensional finite difference forward modeling. The numerical simulation results show that the use of the multi-level air-gun array can enhance low-frequency energy and that the wide-angle reflection received at far offsets of the extended cable has a higher signal-to-noise ratio (SNR) and higher energy. Therefore, we have demonstrated that the unconventional wide-angle seismic acquisition technique mentioned above could overcome the difficulty in imaging the deep weak reflectors of the SYS, and it may be useful for the design of practical seismic acquisition schemes in this region.