Limits and grading evaluation criteria of tight oil reservoirs in typical continental basins of China

作     者：ZHOU Nengwu LU Shuangfang WANG Min HUANG Wenbiao XIAO Dianshi JIAO Chenxue WANG Jingming TIAN Weichao ZHOU Lei CHEN Fangwen LIU Wei WANG Zhixuan ZHOU Nengwu;LU Shuangfang;WANG Min;HUANG Wenbiao;XIAO Dianshi;JIAO Chenxue;WANG Jingming;TIAN Weichao;ZHOU Lei;CHEN Fangwen;LIU Wei;WANG Zhixuan

作者机构：Key Laboratory of Deep Oil and GasChina University of Petroleum(East China)Qingdao 266580China 

出 版 物：《Petroleum Exploration and Development》 (石油勘探与开发（英文版）)

年 卷 期：2021年第48卷第5期

页      面：1089-1100页

核心收录：

学科分类：0820[工学-石油与天然气工程] 081803[工学-地质工程] 08[工学] 0708[理学-地球物理学] 0818[工学-地质资源与地质工程] 

基　　金：Supported by the National Science and Technology Major Project(2016ZX05046-001-005) National Natural Science Foundation of China(41922015) 

主　　题：tight oil tight reservoir reservoir formation limit grading evaluation standard sweet spot evaluation Songliao Basin Junggar Basin 

摘      要：Based on the microscopic pore-throat characterization of typical continental tight reservoirs in China,such as sandstone of Cretaceous Qingshankou and Quantou formations in Songliao Basin,NE China sandy conglomerate of Baikouquan Formation in Mahu area and hybrid rock of Lucaogou Formation in Jimusaer sag of Junggar Basin,NE China the theoretical lower limit,oil accumulation lower limit,effective flow lower limit and the upper limit of tight oil reservoirs were defined by water film thickness method,oil bearing occurrence method,oil testing productivity method and mechanical balance method,*** analysis method was used to compare the differences in pore-throat structure of different tight reservoirs,determine the grading criterion of tight reservoirs,and analyze its correlation with the limit of reservoir *** results show that the boundary between tight reservoir and conventional reservoir corresponds to the upper limit of physical properties,the boundary of classⅡand classⅢtight reservoirs corresponds to the lower limit of effective flow,the boundary of classⅢand classⅣtight reservoirs corresponds to the lower limit of reservoir forming,and the theoretical lower limit of tight reservoir corresponds to the boundary between tight reservoir and ***,the application results of the grading evaluation criterion show that the tight oil productivity is highly controlled by the type of tight reservoir,and classⅠand classⅡtight reservoirs are the favorable sections for high production of tight oil.