摘要
井间地震角道集是地震资料偏移成像和地震资料解释的重要资料,在井间地震成像速度建模中有重要用途.针对井间地震观测系统的特殊性,研究了井间地震角道集提取方法.考虑到井间地震记录中包含上行反射波和下行反射波,从逆时偏移方程出发,推导了井间地震观测系统下的局部偏移距成像点道集提取公式,进而给出了角度计算公式和角道集提取流程.基于模型数据测试在速度正确时得到了拉平的共成像点道集,测试了速度误差对井间共成像点道集的影响,实际资料试处理也得到了较好的效果,表明本方法是合理可行的,为后续的速度分析等地震数据处理与解释工作奠定了基础.
Cross-well Angle Domain Common Imaging Gathers（ ADCIGs） are important data for seismic imaging and interpretation,and play an important role in velocity model building. Focusing on the specificity of cross-well seismic acquisition geometry,we have discussed a method of getting ADCIGs. Considering that Cross-well seismic data contain up-going and down-going reflection data,we have derived local Offset Domain Common Imaging Gathers（ ODCIGs） based on the wave equation of Reverse Time Migration（ RTM） method,and then have got the angle calculating formula to get ADCIGs. We used correct velocity model data to get the normal ADCIGs which consist of some horizontal lines,and run a test to analyze the influence of velocity error upon ADCIGs. The processing of real seismic data also produces good imaging results. These tests show that the method in this paper is reasonable and feasible. It lays a foundation for velocity analysis and subsequent seismic processing.
作者
宋建国
刘盛悦
SONG Jian-guo;LIU Sheng-yue(China University of Petroleum School of Geosciences, Shandong Qingdao 266580, China;Laboratory of Marin Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Shandong Qingdao 266701, China)
出处
《地球物理学进展》
CSCD
北大核心
2018年第2期707-714,共8页
Progress in Geophysics
基金
国家自然科学基金项目(41674125)
国家自然科学基金委员会-中国石油化工股份有限公司石油化工联合基金资助项目(U1663207)
国家十三五重大专项(2017ZX05049002)
国家重点基础研究发展计划项目(973计划项目)(2014CB239104)联合资助
关键词
井间地震
角道集
逆时偏移
共成像点
局部偏移距
cross-well seismic
angle gather
reverse time migration
common imaging point
local offset
