泌阳凹陷北坡油气富集规律与勘探潜力分析

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

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。

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.