摘要
在复杂断块区域,速度建模及偏移成像是地震资料处理的重要环节,偏移成像的质量依赖于速度模型的准确度.为更好的提升复杂断块区域的速度建模精度,本文提出断层控制层析技术.该技术通过结构张量准确识别和提取断层位置,并建立断层控制矩阵和目标泛函表达式,基于上述方式实现对层析反演迭代过程的约束,最终获得高精度的速度场.为验证上述方法的有效性,应用常规速度层析方法与本文方法进行对比,用二者方法得到的速度分别制作合成地震记录,并与实际钻井数据合成地震记录进行相关,结果证实本文方法的数据和钻井数据的相关性为0.75,而常规层析建模方法的数据和钻井数据的相关性为0.58.结论表明本文方法的速度和真实速度匹配程度高,具有较好的应用效果.
In complex area-fault block,velocity modeling and migration imaging are two vital parts in the seismic data processing procedure,and meanwhile the quality of migration imagings is relevant to the accuracy of velocity models.In order to improve the accuracy of velocity modeling in complex fault block area,fault constrainted tomography velocity modeling method technique is introduced in this paper into the process of the tomography velocity modeling.By identifying and extracts fault locations through structural tensor,and establishing the fault constrainted preconditioner matrix and the target function,iterative processes of the tomography inversion can then be constrained to acquire a more accurate velocity field.To verify the effectiveness of this method,the conventional velocity tomography method is compared with the method in this paper,and the obtained velocities are made into synthetic seismic records respectively,which are correlated with the actual drilling data.The correlation between synthetic seismic records obtained by the velocity from the technique in the paper and drilling data is 0.75,while the correlation between synthetic seismic records obtained by conventional tomography modeling velocity and drilling data is 0.58.It shows that the velocity modeling applied with the technology in this paper is highly matched with the real velocity field,and thus has broad application effects.
作者
邓勇
李芳
彭海龙
任婷
刘国昌
DENG Yong;LI Fang;PENG HaiLong;REN Ting;LIU GuoChang(State Key Laboratory of Petroleum Resource and Prospecting,China University of Petroleum,Beijing 102249,China;CNOOC China Limited,Zhanjiang Branch,Zhanjiang 524057,China;CNOOC China Limited,Hainan Branch,Haikou 570000,China)
出处
《地球物理学报》
SCIE
EI
CAS
CSCD
北大核心
2022年第11期4404-4417,共14页
Chinese Journal of Geophysics
基金
国家自然科学基金(42074128)
中海石油(中国)有限公司项目(CNOOC-KJ 135 ZDXM 38 ZJ 02 ZJ)联合资助。
关键词
复杂断块
层析速度建模
断层约束
层析反演
偏移成像
Complex fault block
Tomography velocity modeling
Fault constrainted
Tomography inversion
Migration imaging
