川东北地区须家河组储层特征研究

摘要

通过钻井取心和露头采样测试、岩石薄片分析及扫描电镜分析等手段，对川东北地区须家河组的储层岩石学特征、储层空间类型、成岩作用类型、孔隙结构及孔隙类型等进行了深入分析。结果表明：川东北地区须家河组储层砂岩以中一细粒为主，成分成熟度较低，结构成熟度中等；储集空间主要为残余原生粒间孔隙、次生溶蚀孔隙和裂缝，孔隙结构以小孔、细喉型为主。研究区孔渗较低，为典型的低孔、低渗至特低孔、特低渗储层。%According to the test of drilling cores and outcrop samples, thin section analysis and scanning electronic microscope, lhis paper studied the reservoir petrologic characteristics, reservoir spaee types, diagenesis, pore structure and pore types of Xujiahe Formation in northeastern Sichuan Basin.The result shows that the reservoir sandstone of Xujiahe Formation persents petrological characteristics of medium-fine grained texturd,lower compositional maturity and medium textural maturity. The reservoir pore spaces include residual primary intergranular pores,secondary dissolved pores and fractures.The pore structure is mainly of fine pore and thin throat.The study area is mainly of typical reservoir with low porosity and low permeability.