冀中坳陷潜山内幕油气藏类型与分布规律

Distribution and Types of Buried Hill Oil-Gas Reservoir in Jizhong Depression

随着冀中坳陷潜山油气藏勘探的深入,较隐蔽的潜山内幕油气藏已成为研究的重点。从整个冀中坳陷的宏观角度出发,分析潜山构造演化和内幕油气藏的成藏条件,将坳陷内发育的潜山内幕油气藏分为4类:断阶-断块型潜山内幕油气藏、断脊-断块型潜山内幕油气藏、残丘-断块型潜山内幕油气藏和残丘型潜山内幕油气藏,其中断阶-断块型和断脊-断块型潜山内幕油气藏的潜力较大。不同类型的潜山内幕油气藏分布在不同的二级构造带上,此外,它们还具有近源分布和差异聚集的特点。

With the progress of buried hill exploration in Jizhong depression, the subtle buried hill hydrocarbon reservoirs have been focused as targets in this area. This paper analyzes the tectonic evolution and hydrocarbon accumulation conditions of such a reservoir and classifies it into four types： the reservoir inside step-fault block buried hills, the reservoir inside ridge-fault block hills, the reservoir inside residual-fault block buried hills and the reservoir inside residual buried hills, among which the former two types of reservoirs are of greater potentials. Also, the study shows that different reservoirs inside buried hills are distributed in different structural belts of second order, with characteristics of near-source distribution and differential accumulation.