东海盆地西湖凹陷构造热演化及煤系烃源岩生烃史恢复  

Tectonic-thermal evolution and hydrocarbon generation historyof coaly source rocks in Xihu Sag of East China Sea Basin

作　　者：于仲坤 侯读杰[2] 沈伟锋 赵洪 丁飞 刁慧 YU Zhongkun;HOU Dujie;SHEN Weifeng;ZHAO Hong;DING Fei;DIAO Hui(Shanghai Branch,CNOOC Limited(China),Shanghai 200335;School of Energy Resources,China University of Geosciences(Beijing),Beijing 100083)

机构地区：[1]中海石油(中国)有限公司上海分公司,上海200335 [2]中国地质大学(北京)能源学院,北京100083

出　　处：《长江大学学报（自然科学版）》2023年第4期43-52,共10页Journal of Yangtze University(Natural Science Edition)

基　　金：“十四五”全国油气资源评价项目“中海油矿业权区及周边空白区油气资源评价”(QGYQZYPJ2022-3)。

摘　　要：为了研究东海盆地西湖凹陷煤系烃源岩的热演化特征,在西湖凹陷构造演化分析的基础上,利用盆地模拟技术中的岩石圈模型对西湖凹陷构造热演化史进行模拟,并通过高压釜热模拟实验与动力学模型结合的方法,开展了构造演化史与烃源岩热演化史的系统分析,建立了西湖凹陷的现今地温场,进而探讨煤系烃源岩生烃演化过程。研究表明,暗色泥岩开始生气时间要早于煤岩,在28 Ma B.P.左右,西湖凹陷煤系烃源岩开始快速生气,且在高热演化阶段煤系烃源岩仍具有生气能力;5 Ma B.P.左右处于凹陷内相对深度较浅的烃源岩开始进入生烃高峰。煤系烃源岩在西湖凹陷晚期成藏过程中具有十分重要的作用。In order to clarify the thermal evolution characteristics of coaly source rocks in Xihu Sag of East China Sea Basin,based on the structural evolution analysis of Xihu Sag,the lithosphere model was firstly used in basin simulation technology to simulate the structural thermal evolution history of Xihu Sag.Secondly,the present geothermal field of Xihu Sag was systematically established by means of autoclave thermal simulation experiment and dynamic model,with the study of tectonic evolution history and thermal evolution history of source rocks.Finally,the hydrocarbon generation and evolution process of coaly source rocks were simulated and analyzed.The research shows that the gas generation time of dark mudstone is earlier than that of coal.At about 28 Ma B.P.,the coaly source rocks in Xihu Sag begin to generate gas rapidly,and the coaly source rocks still have the ability of generating gas in the stage of high thermal evolution.The source rock which is located in the shallow relative depth of the Sag at about 5 Ma B.P.begin to enter the peak of hydrocarbon generation.Coaly source rocks have great significance to late-stage accumulation of Xihu Sag.

关 键 词：热演化史 煤系烃源岩 生烃史 西湖凹陷 东海盆地 

分 类 号：TE122.113[石油与天然气工程—油气勘探]