Differential interformational velocity analysis as an effective direct hydrocarbon indicator under velocity reversal conditions,an example from the anomalously high temperature and over-pressured DF1-1 Gas Field in the Yinggehai Basin,South China Sea

作     者：Zhu Hongtao Liu Keyu Chen Kaiyuan Li Min Huang Shengbing Zhu Hongtao1,2,Liu Keyu2,Chen Kaiyuan3,Li Min1 and Huang Shengbing1 1 Key Laboratory of Tectonics and Petroleum Resources of the Ministry of Education,China University of Geosciences,Wuhan,Hubei 430074,China 2 CSIRO Petroleum,P.O.Box 1130,Bentley,WA 6102,Australia 3 School of Energy Resources,China University of Geosciences,Beijing 100083,China

作者机构：Key Laboratory of Tectonics and Petroleum Resources of the Ministry of EducationChina University of GeosciencesWuhanHubei 430074China CSIRO PetroleumP.O.Box 1130BentleyWA 6102Australia School of Energy ResourcesChina University of GeosciencesBeijing 100083China 

出 版 物：《Petroleum Science》 (石油科学（英文版）)

年 卷 期：2009年第6卷第4期

页      面：339-346页

核心收录：

学科分类：081803[工学-地质工程] 08[工学] 0818[工学-地质资源与地质工程] 

基　　金：supported by the National Natural Science Foundation of China (No.40702024) the Project was sponsored by the Scientific Research Foundation for the Returned Overseas Chinese Scholars,Ministry of Education of China (No.2009022014) Open Research Foundation of Key Laboratory of Tectonics and Petroleum Resources (China University of Geosciences),Ministry of Education (No.TPR-2009-33) 

主　　题：DF1-1 Gas Field velocity reversal direct hydrocarbon indicator differential interformational velocity analysis South China Sea 

摘      要：In the DF1-1 Gas Field in the Yinggehai Basin, South China Sea, the velocity-depth plot and velocity spectra show significant variations from a linear trend, exhibiting a distinct reversal phenomenon. Velocity parameters derived from velocity spectral analysis of the seismic data and sonic logs indicate that the interval velocity reverses below 2,100 m (2.2 s two-way time (TWT)) in the DF1-1 Gas Field. Some direct hydrocarbon indicators (DHIs) models developed for the shallow strata cannot be simply applied to the moderately to deeply buried strata for direct exploration target recognition because the velocity reversal has caused the middle-deep gas reservoirs to exhibit a moderate or weak seismic amplitude. The hydrocarbon indicator method of “Differential Interformational Velocity Analysis (DIVA) with the aid of other hydrocarbon indicating techniques was employed to effectively identify DHIs in the middle-deep strata under velocity inversion. The result has shown that the DIVA technique can be effectively used as a DHI in both the shallow and the middle-deep strata in the study area with the shallow strata characterized by Type I DIVA anomaly and the middle-deep strata characterized by the Type II DIVA anomaly.