不整合油气输导能力定量评价——以济阳坳陷太平油田为例

摘要

利用岩心观察、镜下鉴定等对不整合结构进行了系统分析,定量评价了不整合的油气输导能力.结果表明,不整合面下风化岩石中裂缝、溶孔发育,是不整合输导油气的主要通道.不整合油气输导能力主要受不整合结构层的渗透性、厚度、连通性以及遮挡层发育程度、油气运移动力、油气的密度和粘度等因素控制.综合各项影响因素建立了不整合油气输导能力定量评价公式,利用此公式对济阳坳陷太平油田古近系—新近系与前古近系之间的不整合油气输导能力进行评价.计算结果表明,太平油田古近系—新近系与前古近系之间不整合油气输导能力比较好,是油气运移的主要通道,计算结果与实际情况吻合程度较高.%In order to evaluate the transportation ability of unconformity, the unconformity structure is studied systemically by means of core observation and microscopic identification in this paper. The results show that the fractures and dissolved pore that developed in the weathered rock are the main oil-gas migration pathway. So the transportation ability of the unconformity is mainly controlled by the permeability of unconformity structures, thickness of unconformity structures, connectivity of unconformity structures and barrier bed, migration forces, oil density and oil viscosity. In view of the study above, the evaluation formula of transportation ability is established. According to this, the transportation ability of Tr unconformity in Taiping oilfield is evaluated. It is found out that the transportation ability of Tr unconformity is better, which may function as the main pathway for hydrocarbon migration, and it is in well accordance with the actual situation.