东海西湖凹陷Y构造成藏问题探讨

Discussion on the Hydrocarbon Accumulation in Y Structure of Xihu Depression at East China Sea

黄龙泽 沈珊 严涛

HUANG Longze SHEN Shan YAN Tao

中国石油化工股份有限公司上海海洋油气分公司勘探开发研究院，上海　200120 中国石油化工股份有限公司上海海洋油气分公司，上海　200120

Institute of Exploration and Development, SINOPEC Shanghai Offshore Oil & Gas Company, Shanghai 200120, China SINOPEC Shanghai Offshore Oil & Gas Company, Shanghai 200120, China

西湖凹陷中央背斜带中段最大的背斜构造—Y构造多年来勘探一直处于停滞状态。该文通过对Y构造失利井Y1井、Y4井以及Y2井的分析，从异常高压、包裹体、自生伊利石、碳同位素以及物性、岩相资料中，再次梳理了各种资料中关于诸成藏要素的相关性，重新认识Y构造的疏导体系、油气充注史、成藏期、流体势等。研究结果认为：Y构造西侧逆大断层下降盘对于油气成藏最为有利。

Y structure is the largest anticline structure in the middle of the Xihu Sag, while the exploration of Y structure has been in a stagnant state for many years. Through the analysis of abnormal high pressure, inclusions, authigenic illite, carbon isotope, physical properties and lithofacies of the failure wells Y1, Y4 and Y2 in Y structure, we sorted out the relevance of the various elements of hydrocarbon accumulation and re-understand the hydrocarbon migration pathway, hydrocarbon filling history, accumulation period and the fluid potential of the Y structure. The study shows that the descending plate of the large reverse fault on the west side of the Y structure is the most favorable for hydrocarbon accumulation.

https://doi.org/10.3969/j.issn.1008-2336.2021.03.008