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.
出处
《录井工程》
2008年第3期75-78,共4页
Mud Logging Engineering
关键词
焉耆盆地
成藏机理
成藏模式
主控因素
侏罗系
Yanqi Basin
reservoir mechanism
reservoirforming pattern
mainly control factors
Jurassic
