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大港千米桥潜山目的层埋藏深,速度横向变化大,地下地质情况复杂。叠后、叠前时间偏移地震资料不能满足地质需求。为此,采用了提高潜山成像精度的最有效手段,三维连片叠前深度偏移处理技术对该区进行重新处理。文中介绍了叠前道集精细处理、建立初始深度—速度模型、模型的优化、偏移与校正等技术与实现过程。新处理的叠前深度偏移地震资料与旧资料对比,不仅成像精度高,而且得到的波动信息更加丰富。应用新资料重新评价千米桥潜山气藏,取得了一些新认识和显著的地质效果。
Dagang Qianmiqiao target buried deep buried layer, horizontal velocity changes, the complexity of the underground geological conditions. Post-stack, prestack time migration seismic data can not meet the geological needs. To this end, the most effective method to improve the imaging accuracy of buried hills is adopted, and the area is reprocessed by the 3D pre-stack depth migration processing technology. This paper introduces the pre-stack gathers fine processing, the establishment of the initial depth-velocity model, model optimization, offset and correction techniques and implementation process. Compared with the old data, the newly processed prestack depth-offset seismic data not only has high imaging accuracy but also more abundant fluctuation information. The application of new data to re-evaluate Qianmiqiao buried gas reservoirs, and achieved some new understanding and significant geological effects.