惠民凹陷曲堤地区油气成藏要素及富集规律研究

曲堤地区是惠民凹陷南坡油气最为富集的构造带,但随着勘探的深入,勘探难度日益加大,勘探方向也不明确,亟需进一步梳理油气成藏要素,总结成藏规律,寻找油气富集部位。本文从油气藏分布特征研究入手,对该区已发现的油藏进行精细解剖,通过成藏要素的详细分析,总结了油气运聚规律,明确了油气富集区。研究结果表明,夏口断层分段启闭性控制了油气的注入部位,继承性构造背景决定了油气的输导方向,三级断层控制油气分带,四五级断层分割含油条带,储层分布及剥蚀线共同控制了鼻状构造高点油气的富集部位,曲堤东鼻状构造南部剥蚀区是油气可能的富集区。

Hydrocarbon accumulation factors and regularity in Qudi area, Huimin Sag

Qudi area is the most abundant hydrocarbon structural zone in the south slope of Huimin Sag. With the development of exploration, the difficulties of exploration is increasingly growing and the exploration direction is also not clear. In order to search for hydrocarbon enrichment area and summarize accumulation regularity, the accumulation elements need to be further clarified. Based on study of the oil deposits distribution features and through the oil deposits anatomy and studying the accumulation elements, the hydrocarbon migration and accumulation regularity have been summarized and the hydrocarbon enrichment has been identified. Research shows that the hydrocarbon injecting area is controlled by the concealing and opening in different segment of Xiakou fault, the hydrocarbon zones are controlled by the third-level faults and these zones are divided into blocks by fourth-class and fifth-class faults, hydrocarbon accumulation of the nose structural peak is controlled by the reservoir distribution and denudation lines, denuded zone in the southern of Qudidong nose structure is perhaps the hydrocarbon accumulation area.