摘要
根据西湖凹陷不同时期断裂、褶皱构造组合特征分析了新生代构造应力场的演化;利用有限元法模拟了西湖凹陷中央背斜带及其两侧深凹区油气主要成藏期的应力场分布特征,分析了应力场对油气运移聚集的控制作用.研究表明,构造应力是本区油气运聚的主要动力,在中央背斜带及邻区,油气主要向应力低值区运移聚集;中新世晚期,NNE向断裂相对封闭,WNW向断裂相对开启.
The Cenozoic evolution of tectonic stress field can be analysed according to combination features of faults and folds during different periods in Xihu sag, East China Sea. A finite element method is used to model stress fields during major hydrocarbon accumulation in the central anticline belt and the deep sags on its two flanks, and controls of stress fields on hydrocarbon migration and accumulation are analysed. The study shows that the tectonic stress is a main drive of hydrocarbon migration and accumulation. Hydrocarbon would migrate and accumulate towards areas with lower stress in the central anticline belt and its adjacent areas. The NNE_trending faults are relatively closed and the WNW_trending ones relatively opened during Late Miocene.
出处
《中国海上油气（地质）》
2003年第1期51-56,共6页
China Offshore Oil and Gas(Geology)
关键词
东海
西湖凹陷
地质构造
油气运聚
应力场
数值模拟
stress field
numerical model
hydrocarbon migration and accumulation
Xihu sag
