CFP层速度扫描建模方法

Interval velocity scan for model building using CFP technology

1. 中国科学院地质与地球物理研究所,北京100101;2. 中国石油油气勘探软件国家工程计算中心有限公司,河北涿州072750;3. 中国科学院数学与系统科学研究院,北京100080;4. 西安电子科技大学计算机系,陕西西安710010

1. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100101, China;2. CNPC Exploration Software Corp. Ltd., Zhuozhou 072750, China;3. Mathematics and Systematic Institute of Chinese Academy of Sciences, Beijing 100080, China;4. Department of Computer, Xi'an University of Electronics, Xi'an 710010, China

速度模型是做好叠前深度偏移的关键。在CFP(CommonFocusPoint)理论的基础上,给出了一种层速度扫描建模方法,并用实际地震数据进行了速度建模试验,取得了满意的结果。该方法没有常规偏移速度分析方法中常常存在的小炮检距假设或小倾角假设,适合于复杂地下介质的偏移速度分析。它用常规偏移剖面或叠加剖面作为参考,缩小了CFP速度判别准则下的解空间,可以在反射界面的单个分析点上进行,不需要区域性重偏移,比常规的偏移速度扫描方法显著地减少了计算量。

Velocity model is the key to get accurate image of pre stack depth migration. In this paper, an interval velocity scan method using CFP technology is presented and test on real data. The method has no assumption of small offset or small dip as most of other migration velocity analysis methods do, which makes it suitable for model building of complex substructures. Conventional stack or time migration sections were used as constraint that shrinks the solution space under the principle of CFP velocity analysis. Compared with conventional migration velocity analyses,the method can be carried out on single geometric points that reduce computation obviously.