摘要
鄂尔多斯盆地西南部延长组长8是重要的储集层。储集岩主要为细粒岩屑长石砂岩、长石砂岩和长石岩屑砂岩,以低成分成熟度、中等结构成熟度为特征。岩石物性总体较差,孔隙度0.33%～18.7%,平均8.90%;渗透率0.0008mD～18.4mD,平均0.75mD,属于低孔、低渗透储层。主要发育粒间孔、溶蚀孔、晶间孔,喉道以中细喉—细喉为主。储集性能主要受沉积作用和成岩作用控制。沉积作用控制了储层砂体展布,进而影响其岩石学特征。压实作用、胶结作用和溶蚀作用控制了储层孔隙结构特征及储层物性。
Chang 8 Member of Yanchang Formation in southwestern Ordos Basin is an important reservoir.It is mainly composed of fine-grained lithic feldspathic,feldspathic and feldspathic clastic sandstone with a low compositional maturity and a middle texture maturity;it's characterized by low permeability(ranging from 0.0008mD to 18.4mD,0.75mD in average) and low porosity(ranging from 0.33% to 18.7%,8.90% in average);intergranular,dissolved and intercrystalline pore and middle-to-fine and fine throat are developed in Chang 8 Member;and its reservoir property is dominantly governed by sedimentation and diagenesis: the former affects sandbody distribution and then petrologic characteristics whereas the latter including compaction,cementation and dissolution influences both pore structure and physical property.
出处
《天然气勘探与开发》
2010年第2期14-18,共5页
Natural Gas Exploration and Development
关键词
低渗透储层
储层特征
长8储层
沉积微相
成岩作用
low-permeability reservoir
reservoir characteristics
Chang 8 Member
sedimentary microfacies
diagenesis
