1 东北石油大学地球科学学院,黑龙江大庆 163318; 2 中国石油辽河油田勘探开发研究院,辽宁盘锦 124010; 3 Resolution Energy Services, Houston TX 77002, USA
Characteristics and forming mechanism of tight sandstones in the Paleogene Shahejie Formation of southern West Sag,Liaohe Depression
Meng Yuanlin1, Wang Zhixuan1, Zhang Fenglian2, Meng Fanjin3, Jiao Jinhe1, Shi Lidong1
1 College of Geosciences,Northeast Petroleum University,Daqing 163318,Heilongjiang; 2 Petroleum Exploration & Development Institute,Liaohe Oilfield Company,PetroChina,Panjin 124010,Liaoning; 3 Resolution Energy Services,Houston TX 77002, USA
Abstract：Low-yield and commercial oil flows have been discovered in the Paleogene Shahejie Formation,southern West Sag,Liaohe Depression,Bohai Bay Basin. The reservoirs are typical tight sandstone reservoirs characterized by low-ultralow porosity,extra-low-ultralow permeability and low pressure. Based on data of thin sections,SEM,grain size,mercury pressure analysis and physical property,the micro-characteristics and formation mechanisms of tight sandstones were analysed. The results show that:The tight reservoirs(with porosity value lower than 10%)are mainly distributed in the sag area;The formation of tight reservoirs are not controlled by factors such as mineral composition,grain size,grain sorting and roundness;Pore types mainly consist of secondary pores and pore structures are characterized by medium pore diameter,tiny throat and heterogeneous throat sorting;The tight sandstones are mainly formed through compactions and cementations and are thus categorized as diagenetic tight sandstones.
基金资助:国家自然科学联合基金项目(批准号:U1262106),国家自然科学基金项目(批准号:41572135),国土资源部示范工程项目(编号:1211302108019-2)资助; [Co￣funded by the National Natural Science United Foundation of China(No; U1262106),the National Natural Science Foundation of China(No; 41572135) and Demonstration Project of Ministry of Land and Resources(No; 1211302108019-2)]
Meng Yuanlin,Wang Zhixuan,Zhang Fenglian et al. Characteristics and forming mechanism of tight sandstones in the Paleogene Shahejie Formation of southern West Sag,Liaohe Depression[J]. JOPC, 2016, 18(4): 569-580.
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