东海西湖凹陷T气田双宽地震资料处理技术  

Processing Technology of Double Width Seismic Data in T Gas Field in Xihu Sag of East China Sea

作　　者：刘晓晖 Liu Xiaohui(Shanghai Branch of CNOOC Ltd.,Shanghai 200335)

机构地区：[1]中海石油(中国)有限公司上海分公司,上海200335

出　　处：《长江大学学报（自然科学版）》2020年第5期30-35,I0002,共7页Journal of Yangtze University(Natural Science Edition)

基　　金：国家科技重大专项“东海低渗致密天然气勘探开发技术”(2016ZX05027-004)。

摘　　要：东海西湖凹陷T气田地质条件复杂,常规窄方位地震资料品质较低,在基底成像及表征砂体接触关系和储层连通性等方面效果较差。针对上述问题,采集双宽(宽频宽方位)地震资料,并通过多次波压制技术、振幅频率恢复技术和叠前深度偏移技术,使地震资料品质明显提升,上下界面接触关系更加清楚,地质信息更加完整。基于双宽地震资料的纵波速度/横波速度剖面和砂岩概率剖面,能够精确表征砂体的分布范围和横向连通性,与实钻结果符合率较高,对研究东海其他复杂地质条件区域有很好的借鉴意义。T gas field in Xihu Sag in East China Sea is characterized by complex geological conditions,low quality of conventional narrow-azimuth seismic data,and poor performance in basement imaging and characterization of sand body contact relationship and reservoir connectivity.To solve the above problems,seismic data of double width(wideband and wide azimuth)were collected,and the quality of seismic data was obviously improved through multiple wave suppression technology,amplitude frequency recovery technology and pre-stack depth migration technology,so as to make the contact relationship between upper and lower interfaces clearer and the geological information more complete.The longitudinal wave velocity/shear wave velocity(v p/v s)profile and the sandstone probability profile based on the double-width seismic data can accurately represent the distribution range and lateral connectivity of the sand body,which is highly consistent with the actual drilling results and provides a good reference for the study of other regions with complex geological conditions in the East China Sea.

关 键 词：双宽(宽频宽方位)地震资料 多次波压制技术 振幅频率恢复技术 叠前深度偏移技术 西湖凹陷 

分 类 号：P631.44[天文地球—地质矿产勘探]