摘要
根据普通薄片、铸体薄片、扫描电镜、X-衍射等资料,对鄂尔多斯盆地杨旗区长6油层组砂岩的岩石学特征、成岩作用类型等进行了深入研究。研究表明,鄂尔多斯盆地杨旗区长6油层组储集层岩石类型为细粒长石砂岩,其次中粒及中—细粒,细—中粒长石砂岩。粒间孔和长石溶孔是主要的储集空间,其中以小孔和微孔为主,渗透率小于5×10-3μm2,为特低渗储层和接近致密储层。研究区较强的压实作用、胶结作用是形成低孔低渗的主要因素,而溶蚀作用是储层物性改善的主要因素。
Based on the normal thin sections,scan electron microscope and X-ray diffractions,a study was carried out on the characteristics of petrology and diagenesis of Chang 6 reservoirs in Yangqi area,Ordos Basin.Research shows that fine arkose sandstone are the main sandstones of the Chang 6 reservoir.The main granular pore and secondary feldspar-dissolution porewhichare mainly composed of small hole and micropore.The Chang 6 reservoirs has super low permeability and is accessed densify reservoir of which the permeability is less than 5×10-3μm2.The strong compaction and cementation are the main factors which cause the low porosity and low permeability of the reservoir,while dissolution is the main factor for improving the physical property of the reservoir.
出处
《甘肃地质》
2012年第1期42-46,共5页
Gansu Geology
基金
国家重点基础研究发展规划项目(2003CB214602)
