摘要
三叠系储层是阿尔及利亚H区块最主要的含油层位,研究该储层特征及成岩相对区块的开发具有重要的指导意义。通过岩芯、薄片观察及样品测试资料分析,认为三叠系储层以中细粒石英砂岩为主,成分成熟度高、分选性好,颗粒圆度为次棱角-次圆,孔隙以次生孔隙为主,孔喉组合类型以小孔-细喉道为主。三叠系储层已达中成岩阶段B期,成岩相类型划分为火山碎屑溶蚀相、黏土环边胶结相、早期硅质胶结相、晚期硅质胶结相、致密压实相和硬石膏白云石致密胶结相6种。根据成岩相识别与物性分析的匹配结果,火山碎屑溶蚀相物性最好,黏土环边胶结相及早期硅质胶结相次之,晚期硅质胶结相、致密压实相和硬石膏白云石致密胶结相最差。
The Triassic reservoir is the most important oil-bearing layer of the Block H in Algeria,and to study its characteristics and lithogenous phase is of great significance to the development of the block.Based on core,thin section and laboratory analysis data of samples,it is believed that the Triassic reservoir mainly consists of medium-fine quartz sandstone,with high maturity,good sorting,sub-angularity and sub-roundedness.Porosity is mainly composed of secondary pore and its pore throat composition is small pore and fine throat.The Triassic reservoir has reached the stage B of the mesogenetic stage,and the types of lithogenous phase are divided into 6 kinds of volcaniclastic erosion facies,clay ring cementation facies,early silicone cementation facies,late silicone cementation facies,dense compression facies and dense cementation facies of anhydrite and dolomite.The matching of lithogenous phase recognition and material analysis shows that physical property of volcaniclastic erosion facies is the best,followed by clay ring cementation facies and early silicone cementation facies,while late silicone cementation facies,dense compression facies and dense cementation facies of anhydrite and dolomite are the worst.
作者
郭晓
王晖
王盘根
张宇焜
于斌
Guo Xiao;Wang Hui;Wang Pangen;Zhang Yukun;Yu Bin(CNOOC General Research Institute Co.,Ltd.,Beijing 100028,China)
出处
《地质学刊》
CAS
2020年第1期117-125,共9页
Journal of Geology
基金
国家油气科技重大专项“油砂SAGD开发地质油藏评价及方案优化技术”(2016ZX05031-003)资助。
关键词
三叠系
储层特征
成岩相
阿尔及利亚
Triassic
reservoir characteristic
lithogenous phase
Algeria
