摘要
根据砂岩薄片、铸体薄片、扫描电镜、X衍射等研究表明,富黄探区延长组长6储层砂岩为低孔低渗储集岩,其岩石类型为长石砂岩和岩屑长石砂岩,磨圆以次棱—次圆为主,颗粒间以线性接触和点—线接触为主,孔隙式和孔隙—薄膜式胶结为主,砂岩具有成分成熟度低,结构成熟度高的特点.储集砂岩经历的主要成岩作用为压实作用、胶结作用、溶蚀作用和破裂作用.压实作用是导致孔隙度丧失的主要原因,造成的平均孔隙度丧失为30.89%,胶结作用造成的平均孔隙度丧失为6.98%,碳酸盐胶结物和次生加大是造成储层物性降低的主要胶结物.而溶解作用对砂岩平均孔隙度的增加为1.22%,是改善砂岩物性的重要途径.
On the basis of analysis of thin section observation, casting lamella, scan electron microscope and X-ray diffractions etc, the study area was determined to be a the low porosity and low permeability reservoir, whose sandstone types are arkose sandstone and lithic arkose sandstone. They are mainly in re-angular and re-round round forms, line and point-line contact forms with pore and pore-thin film cementation between rock grains. The study reservoir is mainly characterized by low compositional maturity and high textual maturity. The diagenetic factors of Chang 6 reservoir include compaction, cementation, corrosion and disruption. The compaction in the early diagenetic phase, which resulted in 30.89% porosity loss, is the main factor causing the loss of porosity for the sandstone. Cementation resulted in 6.98% average porosity loss, and carbonate and quartz overgrowth are the main cements that have reduced the reservoir quality. But the solution has addedan extra 1.22% porosity to the reservoir, which is an important way to improve the reservoir quality for the sandstone.
出处
《兰州大学学报（自然科学版）》
CAS
CSCD
北大核心
2012年第1期35-42,共8页
Journal of Lanzhou University(Natural Sciences)
基金
国家重点基础研究项目(2003CB214600)
教育部高校博士点基金项目(20116101110006)
留学回国人员择优经费项目
关键词
储层特征
成岩作用
延长组
富黄探区
鄂尔多斯盆地
reservoir character
diagenesis
Yanchang formation
Fuhuang exploration area
Ordos basin
