点扩散函数深度域反演  

Depth domain inversion of point spread function

作　　者：郝洪鉴 刘俊州[2] 韩磊[2] 周游 陈斯宇 HAOHongjian;LIU Junzhou;HAN Lei;ZHOU You;CHEN Siyu(School of Geosciences,China University of Petroleum(East China),Qingdao 266580,Shandong,China;SINOPEC Petroleum Exploration and Production Research Institute,Beijing 100083,China)

机构地区：[1]中国石油大学(华东)地球科学与技术学院,山东青岛266580 [2]中国石油化工股份有限公司石油勘探开发研究院,北京100083

出　　处：《矿产与地质》2023年第1期138-144,共7页Mineral Resources and Geology

基　　金：国家科技重大专项“中西部地区碎屑岩领域勘探关键技术”(2016ZX05002-005);中国石油大学研究生创新工程项目“基于集成学习的变质岩潜山油气藏裂缝特征参数预测方法研究”(YCX2020014)共同资助。

摘　　要：当前地震勘探领域缺乏深度域反演的有效方法,无法直接利用深度偏移后的地震数据进行储层预测。为解决这一问题,本研究采用基于点扩散函数的深度域反演方法对深度域地震数据进行反演,该方法借鉴光学领域的点扩散函数的概念,在偏移速度场中加入均匀分布的点散射体,然后使用波动方程有限差分的方法进行正演模拟,在此基础上进行叠前声波波动方程逆时偏移,得到点扩散函数。并且本研究依据最小二乘理论推导了点扩散函数深度域声波阻抗反演的公式,最后使用该反演方法在Marmousi模型和实际的地震资料上进行了测试。反演测试结果表明:该深度域反演方法反演结果精度高,稳定性好。At present,there is no effective method of depth domain inversion in the field of seismic exploration,so it is impossible to directly use the seismic data after depth migration for reservoir prediction.In order to solve this problem,the depth domain inversion method based on point spread function is used to inverse the depth domain seismic data.This method uses the concept of point spread function in the field of optics for reference,adds uniformly distributed point scatterers to the migration velocity field,and then uses the finite difference method of wave equation for forward simulation.On this basis,the prestack acoustic wave equation inverse time migration is carried out to obtain the point spread function.Based on the least square theory,the inversion formula of acoustic wave impedance in depth domain of point spread function is deduced.Finally,the inversion method is tested on Marmousi model and actual seismic data.The inversion test result shows that the depth domain inversion method has high accuracy and good stability.

关 键 词：深度域反演 点扩散函数 叠前深度偏移 地震勘探 

分 类 号：P631.4[天文地球—地质矿产勘探]