摘要
根据扫描电镜(SEM)、铸体薄片、X衍射资料分析结果,对川南地区须家河组储集砂体的岩石学特征及成岩作用的主要类型进行深入研究。储集砂体成分以岩屑长石砂岩和长石岩屑砂岩为主,成岩作用及其特征研究表明:研究区须家河组储层正处于中成岩A期,早期的压实作用是使物性变差的首要因素,酸性介质条件下的溶蚀作用形成的次生孔隙对于砂岩的储集性能具有明显的改善作用。溶蚀作用使深部储层出现孔隙度、渗透率高异常发育带。
Based on the analysis of cast thin section,scan electronic microscope and X-ray diffractions,the characteristics of petrology and diagenesis on reservoir in Xujiahe Formation in the Southern Sichuan Basin were studied.The result shows that the main reservoir sandstones in the area are lithic arkose and feldspathic litharenite.The results of diagenetc characteristic study show that reservoirs in Xujiahe Formation are in the middle of diagenetic phase A.The early diagenetic compaction is the most important factor causing poor physical property,and the secondary pores resulted from strong dissolution in the acidic media condition can distinctly improve the reservoir performance of sandstone.The dissolution would result in high porosity and high permeability in deep reservoirs.
出处
《石油天然气学报》
CAS
CSCD
2012年第11期36-40,167,共5页
Journal of Oil and Gas Technology
基金
国家油气科技重大专项(2011ZX05005-004-08HZ)
国家自然科学基金项目(41173035)
西安石油大学创新基金项目(YS29030528)
关键词
成岩作用
储层物性
须家河组
川南
diagenesis
reservoir physical property
Xujiahe Formation
south of Sichuan Basin
