准中1区三工河组低渗储层特征及成岩作用演化

张江华 刘传虎 朱桂林 董臣强 周晋科

中国石化胜利油田分公司新春采油厂，山东 东营 257000

Xinchun Oil Production Plant, Shengli Oilfield Company, SINOPEC, Dongying 257000, China

综合运用岩心描述、薄片观察、物性分析等技术手段，对准中1区三工河组低渗储层特征及成岩作用演化进行了研究。结果表明，研究区岩石以长石岩屑砂岩为主，含少量岩屑长石砂岩、亚长石砂岩及亚岩屑砂岩。储层整体上以中低孔、低渗特低渗为主，孔渗相关性较好；储集空间有原生孔隙、次生孔隙、混合孔隙及少量微裂缝。成岩作用类型包括压实作用、胶结作用、溶蚀作用及交代作用等。成岩作用发生的先后顺序为：压实作用—压实作用/绿泥石薄膜/菱铁矿胶结—压实作用/长石溶蚀/石英加大/自生高岭石胶结—压实作用/硬石膏胶结—压实作用/方解石胶结/铁方解石胶结/铁白云石胶结—压实作用/黄铁矿胶结。

This paper studies the characteristics of J1s low permeability reservoir and diagenetic evolution in Block 1 of central Junggar Basin by means of core description, thin section microscopy observation, physical property analysis and other technical methods. The results show that the rocks in the study area are mainly composed of feldspathic lithic sandstone, containing a small amount of lithic arkose, feldspathic sandstone and lithic sandstone. Reservoirs have middle or low porosity and low or extra-low permeability. The correlation of porosity and permeability is good. Reservoir space consists of primary pore, secondary pore, mixed pore and micro cracks in small quantities. The diagenesis types include compaction, cementation, dissolution and metasomatism. Diagenetic sequence is as follows: compaction—compaction/chlorite film/siderite cementation—compaction/feldspar dissolution/quartz overgrowth/antigenic kaolinite cementation—compaction/anhydrite cementation—compaction/calcite cementation/iron calcite cementation/iron dolomite cementation—compaction/pyrite cementation.

10.6056/dkyqt201405011