【摘要】 采用岩芯观察、薄片鉴定、成像测井及地震资料分析等手段,对滴西地区石炭系火山岩储集空间类型、形成因素及展布特征进行了研究。结果表明,滴西地区石炭系火山岩储集层岩类主要为玄武岩、正长斑岩、火山角砾岩及熔结凝灰岩。储集空间可划分为原生孔隙、次生孔隙、原生裂缝及次生裂缝四种类型。其中,原生孔隙主要为气孔和粒间孔,原生裂缝发育收缩缝和炸裂缝;次生孔隙以晶内溶孔、基质溶孔占绝对优势,次生裂缝以构造缝为主。研究区控制储集空间形成的因素主要为火山岩岩性岩相、风化淋滤作用、构造作用及溶蚀作用,原生储集空间类型及发育位置受岩性岩相控制,而后三种作用是该区形成次生储集空间的主要原因,且从西北至东南方向,其控制因素依次由岩性岩相过渡为风化淋滤作用,直至构造和溶蚀作用。据此,滴西17,14井区的玄武岩原生气孔、火山角砾岩内粒间孔受岩性岩相控制均呈东北向长条状展布;滴西10井区熔结凝灰岩和火山角砾岩中的次生溶孔围绕断裂展布;滴西18井区的斑晶、基质溶孔受岩体及断裂共同制约。更多还原

【Abstract】 Reservoir space types,forming factors,and distribution of the Carbonferons volcanic rocks in Dixi area are investigated by core inspection,thin section analyses,imaging logging,and seismic data interpretations.The results show that rock types of carboniferous volcanic reservoir in Dixi area include mainly basalt,syenite porphyry,volcanic breccia,and ignimbrite.Reservoir space can be divided into four types,namely primary pores,secondary pores,primary fractures,and secondary fractures.The primary pores are mainly gas pores and intergranular pores.Primary fractures include shrinkage induced joints and explosion related cracks.Intragranular dissolved pores and groundmass dissolution pores predominatec the secondary pores,and secondary fractures are prevailing tectonic fractures.The controlling factors of the reservoir space are volcanic lithology and facies,weathering and leaching,tectonism and dissolution.The types and distribution of primary reservoir space are controlled by lithology and facies,while secondary pore space and fracture are governed by the later three factors.From the northwest to the southeast,the controlling factors changed from the volcanic lithology and facies to the weathering and leaching,tectonism and dissolution.According to these,the gas pores and intergranular pores in Dixi 17 and 14 well area,are controlled by lithology and facies,resulting in a northeast-trending long strip.The secondary dissolved pores in ignimbrite and volcanic breccia from Dixi 10 well area occur along the fractures.The development of intragranular and groundmass dissolution pores are controlled by both the subvolcanic intrusives and fractures in Dixi 18 well area.更多还原