摘要
根据薄片、铸体薄片、扫描电镜、X-射线衍射及化验分析等资料,对延长油气区山2段储层的岩石学特征、成岩作用类型和阶段划分及其对孔隙的影响进行了研究。研究表明,该区山2段储层砂岩以石英砂岩、岩屑质石英砂岩为主,成分成熟度较高,结构成熟度较低。成岩作用类型主要包括:压实作用、胶结作用和溶蚀作用。砂岩经历了早成岩阶段A、B期和晚成岩阶段A1、A2和B期的成岩演化阶段。压实作用和胶结作用是砂岩孔隙度降低的主要原因,分别造成19.5%和14%的原生孔隙丧失;溶解作用形成的次生孔隙在一定程度上改善了砂岩储集性能,溶蚀作用增加的新孔隙平均为1.7%。
Based on the analysis of casting section, scan electron microscope, X-ray diffractions, this paper has studied the characteristics of petrology, diagenesis and parameters influencing porosity on Shan-2 Member of Shanxi Formation in Yanchang oil-gas field of Ordos Basin. The study result shows that the main sandstone in the area is quartz sandstone and lithic quartz sandstone with the lower compositional ma- turity and the higher structure maturity. Reservoirs diagenesis types include compaction, cementation and dissolution. The sandstones have experienced diagenetic evolution processes of A and B phases during early diagenesis and A1, A2 and B phases during late diagenesis. Decrease of sandstone porosity is mainly caused by compaction and cemention, which contributes 19.5% and 14% to the loss of primary pores re- spectively. Secondary pore resulted from dissolution improved the reservoir property of sandstone to some extent while diaclases contribute less in improving the reservoir property of sandstone and the increasing porosity is 1.7 % because of dissolution.
出处
《地质科技情报》
CAS
CSCD
北大核心
2013年第1期114-118,124,共6页
Geological Science and Technology Information
基金
国家重点基础研究发展计划项目(2003CB214602)
关键词
鄂尔多斯盆地
延长油气区
成岩作用
山西组山2段
Ordos Basin
Yanchang oil-gas filed
reservoir diagenesis
Shan-2 Member of Shanxi Formation
