蠡县斜坡古近系断层油气藏特征及其成藏主控因素

Characteristics and Main Controlling Factors of Paleogene Fault Reservoirs in Lixian Slope

根据蠡县斜坡研究区古近系断层油气藏分布特征和含油气性特征,探讨了古近系断层油气藏成藏的主要控制因素。研究认为蠡县斜坡断层油气藏具有烃源岩、断裂、有利储集相带和输导体系联合控藏的特点。古近系油藏主要围绕生烃洼陷呈带状分布;发育于斜坡中外带的北东向早期断对油气主要起遮挡聚集作用,发育于斜坡中内带的北东向晚期断层对油气主要起输导作用,也有部分晚期断层聚集成藏;油气藏主要分布在三角洲前缘相和河流相砂体中;由斜坡中低部位的断层垂向输导通道和鼻状构造砂体横向输导通道组成的断层-砂体复合输导体系是蠡县斜坡中南部主要的油气输导体系类型。

According to the fault reservoir distribution and hydrocarbon characteristics of the study area in Lixian Slope, the main controlling factors of the fault reservoir accumulation in Paleogene were discussed. The study results suggest that the fault reservoirs in Lixian Slope are controlled by source rocks, faults, favorable reservoir facies and conducting systems. The Paleogene reservoirs are mainly zonally distributed around the hydrocarbon depression. The earlier north-east faults mainly developed in the outer zone and mesozone of the slope, played a major role of the hydrocarbon accumulation; and the later north-east faults mainly developed in the inner zone and mesozone of the slope, played a major role in transporting hydrocarbon, there were also some of which forming reservoirs. Reservoirs are mainly distributed in the sand bodies of the delta front facies and fluvial facies. Fault-sand composite conducting system, which is composed of vertical faults in the central and lower part of the slope and lateral sand bodies in the nose structure, is the main hydrocarbon transport system type in the central and southern Lixian slope.