摘要
用小孔径波动方程三前深度偏移完成大面积数据的成像，不仅总的计算量较大，而且成像畸变较严重，为了进行大孔径波动方程叠前深度偏移，必须将实际的小孔径资料合成大孔径资料，并解决大孔径资料的成像方法．ＡＭＯ等合成孔径方法，数据合成方式简单，但成像方法是近似的且较复杂．面炮方法从理论上讲数据合成方式较简单，成像方法是精确的且较简单，但其应用适用于远道振幅比近道弱很多的情况．在窄线三维地震资料情况，其联络测线方向不易满足面炮应用条件．针对这种情况，本文将最小二乘原理应用于波场成像，提出适用窄线三维地震资料的面炮方法．为了解三维波动方程叠前深度偏移的面炮方法解决复杂油气藏的可行性、所需计算资源和成像效果，我们利用大庆ＳＷ地区三维地震资料进行了实验研究．通过研究，我们获得了面炮方法的实际效果，获得了所需计算资源的测试数据．对实际效果的分析对比表明，面炮方法是一种三维波动方程叠前深度偏移的快速方法，有较好应用前景．
Limited aperture will cause recording footprint in wave equation prestack migration and need large computation quantity through padding the image volume. To accelerate the calculation and reduce migration artifacts, technique of synthetic aperture is need. The method of AMO, DMO and SOM have shortcoming of complexity on imaging theory though they have advantages of simpty on synthetic data. Area shot method has advantages of simplicity on imaging theory and on synthetic data, but they will work on the case of small amplitude ratio of far channel and near channel. in the case of land 3d seismic acquisition, the range of crossline is too short to fit the condition of area shot synthetics. Least-squares principle is apply in imaging theory in order to introduce the area shot method for land 3d seismic acquisition . In order to for solve problem of complex hydrocarbon reservoir, the computation resources needed, and the imaging result, we conduct a experiment of area shot method through 3d data of Daqing SW area. The experiment show prospect of the potential applications.
出处
《地球物理学进展》
CSCD
2001年第3期58-67,T002,共11页
Progress in Geophysics
基金
中国科学院知识创新工程重大项目资助课题(项目编号
KZCXL-y01)
国家自然科学基金与大庆石油管理局联合资助项目(4989
