黄骅坳陷北堡地区深层火成岩储层评价

黄骅坳陷北堡地区沙一段、沙三段深层火成岩是该区重要的储集岩,该储集岩以玄武岩和火山碎屑岩为主,玄武岩以裂缝为主要储集空间,火山碎屑岩以粒间次生孔隙和微裂缝为主要储集空间;沙一段薄层基性玄武岩微裂缝发育,而中性凝灰岩粒间孔隙和微裂缝组合发育,沙三段厚层玄武岩顶底裂缝发育,而中性凝灰岩微裂缝则非常发育;低中孔隙度和渗透率变化大为储集层的主要特征。岩性、火山岩相带、构造应力、充填期与聚油期相近是火成岩储集空间发育的主要控制因素。沙一段火山碎屑岩类发育,但分布范围小,沙三段以玄武岩为主,厚度大,分布广。火成岩顶面构造高部位是有利储层分布区,为进一步勘探的目标。

RESERVOIR EVALUATION OF DEEP-SEATED IGNEOUS ROCKS IN BEIPU REGION,HUANGHUA DEPRESSION

The reservoir rocks of Beipu region in Huanghua Depression are deep seated igneous rocks of Sha 1 and Sha 3 members.The reservoir rocks are mainly pyroclastic rocks and basalts.Fractures are primary preserving spaces of the basalts;intergranular secondary pores and micro fractures are the basic preserving spaces of pyroclastic rocks.The reservoirs are characterized by considerable variation in porosity and permeability.The development of preserving spaces of igneous rocks are controlled by lithologic feature,rock facies zone,tectonic stress and the coincidence of filling stage with oil accumulation stage.The pyroclastic rock of Sha 1 member developed well with small distribution range;the basalt of Sha 3 member are distributed extensively with considerable thickness.The highes on the top structures are targets for further exploration.