盐下地震勘探实践和认识
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摘要
盐下地震勘探是目前国际上公认的难题。针对不同地区的特点,很多学者通过实践提出了一些有效而实用的解决办法。本文针对盐丘异常发育区——肯基亚克油田勘探实例,分析了盐丘速度异常导致的构造不落实问题,通过叠前深度偏移的多轮迭代处理建立深度一层速度模型,细化层速度分析,在高质量道集数据条件下,采用基于基尔霍夫算法的叠前深度偏移方法,取得了较好的处理效果。
Subsalt seismic exploration is currently international generally recognized difficulty. Accordance with the characters of different areas, many scholars presented some effective and practical solutions by practice. Through the exploration case in Ken'jiyak oilfield where well-developed subsalt anomaly, the paper analyzed the issue of the structural uncertainty because of anomalous salt veloci ty; built up depth-interval velocity model by multiple iteration of prestack depth migration and finely analyzed the interval velocity and adopted Kirch-hoff algorithm-based prestack depth migration in a condition of high quality of gather data, achieving good processing results.
Subsalt seismic exploration is currently international generally recognized difficulty. Accordance with the characters of different areas, many scholars presented some effective and practical solutions by practice. Through the exploration case in Ken'jiyak oilfield where well-developed subsalt anomaly, the paper analyzed the issue of the structural uncertainty because of anomalous salt veloci ty; built up depth-interval velocity model by multiple iteration of prestack depth migration and finely analyzed the interval velocity and adopted Kirch-hoff algorithm-based prestack depth migration in a condition of high quality of gather data, achieving good processing results.
引文
[1] Jiao Junru et al. An improved methodology for sub-salt velocity analysis. The expanded abstracts of 76th SEG Mtg, 2006
[2] Li Zhiming et al. Depth imaging case history: a sub-salt prospect, Deepwater, Gulf of Mexico. The expanded abstracts of 72nd SEG Mtg, 2002
[3] Wang Bin et al. 3D Sub-salt tomography based on wave equation migration perturbation scans. The expanded abstracts of 74th SEG Mtg ,2004
[4]凌云等．宽／窄方位角勘探实例分析与评价(二)．石油地球物理勘探,2005,40(4):423～427
[5]凌云研究组．三维地震数据的分析和监测方法研究．石油地球物理勘探,2002,37(5):433～440
[2] Li Zhiming et al. Depth imaging case history: a sub-salt prospect, Deepwater, Gulf of Mexico. The expanded abstracts of 72nd SEG Mtg, 2002
[3] Wang Bin et al. 3D Sub-salt tomography based on wave equation migration perturbation scans. The expanded abstracts of 74th SEG Mtg ,2004
[4]凌云等．宽／窄方位角勘探实例分析与评价(二)．石油地球物理勘探,2005,40(4):423～427
[5]凌云研究组．三维地震数据的分析和监测方法研究．石油地球物理勘探,2002,37(5):433～440