辽河坳陷西部凹陷坡洼过渡带岩性油气藏形成条件

Forming conditions of lithologic reservoir in transition zone of western Liaohe Depression

辽河坳陷西部凹陷构造油气藏勘探的难度日益增大。分析西部凹陷中南段坡洼过渡带的沉积体系、油源体系、输导体系及油藏封盖体系,认为坡洼过渡带具备形成大规模岩性油气藏的地质条件,可作为下一步勘探的主攻方向之一。在该思路指导下,综合应用测井、地质与地震资料,在坡洼过渡带实施勘探后,陆续发现了欢103、齐231、锦306等岩性油气藏,建成了亿吨级优质油气储量区块,展示了坡洼过渡带良好的勘探前景。

The structural hydrocarbon reservoir exploration is becoming more harder in the western Liaohe Depression. It was proved that the transition zone of slope and depression has the geo[ogic conditions of forming a [arge-scale [ithologic reservoir by analyzing the sedimentary system, oil sources, transport system and sealing system. It could be the main direction in the future exploration. Following this cognition and by synthetically using log, geological and seismic data, Huan 103, Qi 231 and Jin 306 traps have been found as the lithologic reservoirs, showing a great exploration potential.