焉耆盆地侏罗系煤系地层油气成藏机理分析  

Hydrocarbon accumulation mechanism analysis for coal measures layer of Jurassic in Yanqi Basin.

作　　者：肖自歉[1] 金贝贝[2] 王冶[2] 段心建[2] 张辉[2] 

机构地区：[1]河南石油勘探局地质录井公司 [2]河南油田分公司勘探开发研究院

出　　处：《录井工程》2008年第3期75-78,共4页Mud Logging Engineering

摘　　要：从油气成藏的基本条件、成藏期次、成藏模式和成藏主控因素入手,对焉耆盆地侏罗系煤系地层的油气成藏机理进行了深入分析,并预测了有利的油气成藏区带,对于指导下一步油气勘探和缓解储量压力具有重要的现实意义。针对该区具有多期生烃、多期成藏和南北差异的特点,构造演化的不均衡性导致成藏时间南早北晚、油气藏破坏南重北轻、油气分布南贫北富的特征,明确提出:下一步的油气勘探要立足于北部凹陷,寻找燕山期和喜马拉雅期继承性的构造圈闭,在断裂欠发育区寻找燕山期的古油气藏,并积极探索西山窑组和第三系的构造圈闭;对于南部凹陷要以寻找断裂欠发育区的燕山期古油气藏为主,选择不易被破坏的岩性油气藏作为勘探的突破口。Starting with basic conditions of hydrocarbon accumu- lation,reservoir-forming periods and the reservoir-forming pattern and main control factors,a deep analysis was made to the hydrocarbon accumulation mechanism of coal meas- ures layer of Jurassic in Yanqi Basin,and the favorable hy- drocarbon accumulation zones were forecasted,it has im- portant and realistic significance for guiding following oil- gas exploration and relieving reserves pressure.In view of the characteristics of multistage hydrocarbon generation, multistage reservoir forming and the variation between the south and the north of Yanqi Basin,the non-equilibrium of tectonic evolution was the reason which resulted in the char- acteristics that the accumulation time of the south is earlier than the north,the damage of hydrocarbon reservoir of the south is more serious than the north and hydrocarbon distri- bution of the south is poorer than the north.The authors definitely pointed out that the next oil-gas exploration will be based on the northern sag to seek inherited structure clo sures of stages of Yanshan and Ximalaya,to find palaeo-hy- drocarbon reservoirs of Yanshan stage at underdeveloped zones of fractures and to take a vigorous exploration for structural trap of Xishanyao formation and tertiary system. For the southern sag,we mainly seek palaeo-hydrocarbon reservoirs of Yanshan stage at underdeveloped zones of frac- tures and choose lithologic reservoirs which are not easily destroyed as exploration breakthrough point.

关 键 词：焉耆盆地 成藏机理 成藏模式 主控因素 侏罗系 

分 类 号：P618.130.2[天文地球—矿床学] P618.110.2[天文地球—地质学]