摘要
何家集区延长组长4+5-长6储集层岩石类型以中-细粒长石砂岩为主,颗粒间多为线、点-线接触,加大-孔隙式和孔隙-薄膜式胶结,总体具有成分成熟度低、结构成熟度较高的特征。粒间孔和长石溶孔是主要的储集空间,其中以大孔和中孔为主,绝大多数渗透率<10×10-3μm2,主要为特低渗储层和接近致密储层。沉积相带、矿物成分及砂岩粒径等是影响研究区储集层性质的关键因素。另外,较强的压实作用、胶结作用也是该区形成低孔低渗储集层的重要因素,而溶蚀作用是储层物性改善的主要因素。
Medium-fine arkose is mainly sandstone of the Formation in Hejiaji area. There have line and point-line pore-thin film cementation between rock grains. The Chang 4 ＋ 5 - Chang 6 reservoir, of Yanchang contact forms which are overgrowth-pore and Chang4 ＋ 5 -6 reservoir is characterized by low component maturity and upper textural maturity. The main pore types are granular pore and secondary feldspar-dissolution pore which are composed of megalospore and axial canal mainly. The Chang 6 restervoir are super low permeability and accessed densified reservoir of which the majority permeability less than 10×10^-3μm^2. The sedimentary facies, mineral composition and grain diameter of the sandstones are the key factors of influencing the reservoir formation and evolution. Furthermore, the strong compaction and cementation are the main factors which result in the low porosity and low permeability of the reservoir, while dissolution is the main factor for improving the physical property porosity of the reservoir.
出处
《西安科技大学学报》
CAS
北大核心
2009年第2期195-199,共5页
Journal of Xi’an University of Science and Technology
基金
国家重点基础研究发展规划项目(2003CB214602)
陕西省自然科学基础研究计划项目(2006z02)
关键词
何家集区
延长组
储层特征
储层物性控制因素
Hejiaji area
Yanchang formation
reservoir characteristic
control factor of reservoir property
