论文详情
为了消除山前带复杂地表对速度分析与建模以及偏移成像的影响，基于平滑地表面和初至波反演底界面两个关键参考面，提出了双界面匹配的一体化速度建模技术。该方法通过表层模型驱动的道间时差校正与起伏地表偏移结合，消除了复杂地表引起的高低频道间时差；通过时间域浅中深层速度融合，实现深度域一体化速度初始建模；采用地质模式约束的沿层层析、网格层析修正速度模型并结合起伏地表深度偏移逐步提高速度模型精度。将该方法应用于天山南山前带阳霞区块实际地震资料处理，整体上提高了偏移成像质量，尤其是阳霞构造的成像效果得到明显提升。
In order to remove the influence of complex near surface conditions on velocity model building and imaging,based on two key reference interfaces including smoothing ground surface and first break inversion bottom,a double interfaces matching integrated velocity model building technique is proposed.By combining surface model-driven static correction between traces with irregular topography migration,the moveouts between high-frequency and low-frequency traces caused by complex surface is removed.By merging the velocities of shallow,middle and deep layers in time domain,the integrated velocity initial modeling in depth domain is achieved.By applying geological pattern constraint layered tomography and grid tomography,the velocity model is modified,and its precision is gradually enhanced combing with irregular topography depth migration.The technique is applied on the actual seismic data processing to Yangxia area at the piedmont zone in the South of Tianshan Mountain,and the imaging quality is significantly improved.
中国石油化工股份有限公司西北油田分公司科研项目(XB05KJ201407)资助。