泌阳凹陷北坡油气富集规律与勘探潜力分析

在对泌阳凹陷北部斜坡油气分布特征进行总结的基础上,根据油源、鼻状构造、砂体延伸方向及规模、断裂系统特征以及它们之间的配置关系,将北部斜坡划分为三种成藏模式:汇集式运聚成藏模式、沿断层运聚-北东向断层调整油气运移方向,北西向断层控制聚集成藏模式和斜坡自生自储式成藏模式。分析总结了油气富集规律特征:①继承性的沉积-构造斜坡是油气大规模运移的指向区,鼻状隆起是油气富集带;②斜坡内带是形成低位扇岩性油气藏和断层-岩性油气藏的有利地区。指出了核三下段、斜坡内带断层-岩性油藏、非构造主体部位岩性或断层岩性油藏、斜坡边缘浅层不整合油藏等是下步勘探的主要潜力目标。

Oil and gas accumulation and exploration potential in the Biyang sag north slope

By summarizing distributional characteristics of oil and gas of the northern slope belt in Biyang sag,on the basis of the oil sources, nose-like structure, sand body extension direction and size, fault system characteristic and their configuration relationships, northern slope belt can be divided three types of accumulation models:migration-accumulation of convergent type, migration and accumulation along the fault-adjusting hydrocarbon migration along the northeast of sag, controlling accumulation model and slope selfsource and self-reservoir accumulation models along the northwest of sag. This paper analyzed and summarized the regularities and characteristics of hydrocarbon enrichment that are ①inheritance deposition-tectonic slope is directing zone of hydrocarbon large-scale migration, and nose shaped uplift is hydrocarbon enrichment belt;②slope belt and the center of sag are favorable areas of shaping low-stand fan lithologic reservoirs and fault-lithologic reservoirs. And it pointed out that the main potential goals of the further exploration are old oilfield potential tapping, H3 lower section, fault-lithologic reservoirs in the slope belt, non-structural principal part lithology and fault-lithologic reservoirs, unconformity reservoirs in slope border shallow layer and so on.