摘要
逆冲构造带是玉北地区奥陶系油气勘探重要领域,受窄方位地震采集和层间多次波混叠效应影响,逆冲构造带及洞型储层成像不能满足勘探部署需求,制约了该区已发现油藏的拓展。笔者在分析影响复杂构造成像关键因素的基础上,采用了OVT域道集规则化处理,弥补了常规三维地震空间采样不规则的缺陷。同时,通过使用近似垂直断裂带的长偏移距方位角道集进行成像,提高了构造带速度建模的精度,尽可能地削弱了层间多次波混叠效应。结合多次波VSP波场特征分析与应用,逆冲构造带及缝洞型储层的成像质量得到明显改善。
The thrust belt is an essential area for Ordovician oil and gas exploration in the Yubei region.However,the imaging of thrust structures and cave reservoirs is limited by the narrow-azimuth seismic acquisition and the interference of intra-layer multiple reflections.This constraint hinders the expansion of the already discovered oil reservoirs in the area..In this study,based on the analysis of critical factors affecting complex structural imaging,the OVT domain gathers regularization processing to compensate for the irregularities in conventional 3D seismic spatial sampling.Additionally,by using azimuthal gathers with a long-offset approximation of vertical fault zones for imaging,the accuracy of the velocity modeling for the thrust belt is improved,and efforts are made to minimize the interference effects of interbed multiple waves.By combining the analysis and application of multiple wave VSP wavefield characteristics,the imaging quality of the thrust belt and fractured cavity reservoirs is significantly improved.
作者
沈向存
魏华动
吴国培
SHEN Xiangcun;WEI Huadong;WU Guopei(Exploration and Production Research Institute,Sinopec Northwest Oil Field Company,Urumqi 830011,China)
出处
《物探化探计算技术》
CAS
2024年第6期686-695,共10页
Computing Techniques For Geophysical and Geochemical Exploration
基金
中国石油化工股份有限公司科技部资助项目(P22124)。
关键词
OVT
规则化处理
分方位道集
层间多次波
VSP波场
匹配分离
OVT
regularization processing
azimuthal gathers
interlayer multiple wave
VSP wavefield
matching and separation
