惠民凹陷盘河构造深层油气成藏条件研究

Reservoir-forming Conditions of Deep Zone in Panhe Structure of Huimin Depression

为探明惠民凹陷盘河深部构造,使勘探向深部拓展,利用近期的高精度三维地震资料,研究了惠民凹陷盘河深层的构造特征与圈闭发育规律。从油源、储层、盖层及油气运聚条件入手,深入研究盘河构造深层成藏规律,分析油气成藏的类型与主控因素。研究表明,盘河构造发育了北东东向和北北东向两组断裂,北掉断层仅在早期发育,是局部圈闭形成的关键,南掉断层发育较晚但长期活动,对油气运移与成藏起主要作用。临南洼陷内生成的油气通过极为发育的断裂体系以侧向运移和阶梯状运移方式聚集到盘河深层构造圈闭中,形成了主要以反向断块为主的复杂断块油藏,具有很大的勘探潜力,反向断阶带是最有利的勘探目标。

In order to explore the Panhe structure of Huimin depression, and to extend the exploration to deep zones, the structural features and the trap distributions of deep zones in the Panhe structure of Huimin depression are studied by using the recent 3D seismic data. Reservoir-forming conditions in deep zones in the Panhe structure, the reservoir types and the controlling factors of hydrocarbon accumulation are analyzed based on oil-sources, reservoirs and conditions of hydrocarbon accumulation. It is shown that two faults with NEE and NNE trends were developed, the fault extending towards the north was developed in the early-stage, which is the key of the local trap forming, the fault extending towards the south was developed in the late-stage with the long-term fault activity, which is the main controlling factor for oil ＆ gas migration and reservoir-forming. The oil-gas generated in the Linnan sub-sagging was accumulated into the trap of the Panhe structure as a fault system by stepping migration and late migration. Complex fault block reservoirs with reverse fault blocks were formed, which shows high exploration potentiality, and the reverse fault step zone is the most favorable exploration target.