西湖凹陷迎翠轩地区古新统沉积相及成藏条件探讨

Discussion on Sedimentary Facies and Hydrocarbon Accumulation Conditions of Paleocene in Yingcuixuan Area, Xihu Sag

陈琳琳 高月华 李昆 黄龙泽 周静毅

CHEN Linlin GAO Yuehua LI Kun HUANG Longze ZHOU Jingyi

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

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

东海陆架盆地西湖凹陷保俶斜坡北部迎翠轩地区古新统将成为深层勘探新领域，由于目前尚无直接的钻井资料，从地震资料出发，从构造控相角度并结合“再沉积化石群落”资料推测了该地区古新统沉积环境和三个主要相区：（1）凸起前缘冲积扇裙；（2）下切谷相区；（3）滨外浅滩相区；在此基础上既探讨了古新统成藏组合中烃源岩，成熟窗口以及有利圈闭；也提出两点不利因素，即高位断阶不利于油气藏封堵和古新统成藏组合的断裂活动期与成藏期之间的配置问题。综合有利和不利因素，探讨了古新统勘探新领域的成藏条件及勘探方向。

The Paleocene in Yingcuixuan area of northern Baochu Slope will become a new field of deep exploration in Xihu Sag of East China Sea shelf basin. Due to the lack of drilling data, the authors infer the sedimentary environment and facies zones in Paleocene period based on the study of seismic data, relationship of sedimentary facies and tectonic setting, as well as the data of redeposited fossil communities. Three dominant facies zones are recognized and they are: (1) the alluvial fans along uplift front; (2) the incised valley facies zones; (3) the offshore shoal facies zone. Then the authors discuss the source rocks, the hydrocarbon generating window and trap conditions in the Paleocene plays. Meanwhile, two unfavorable factors i.e. the high risk of lateral sealing ability in the high part of the fault terrace and the match of fault activity period with hydrocarbon migration are pointed out. Taking into consideration of both the favorable and unfavorable factors, the authors summarize the reservoir forming conditions in the Paleocene plays in the study area and propose the exploration direction.

https://doi.org/10.3969/j.issn.1008-2336.2016.03.013