Genesis analysis of high GR reservoir and its well-log based recognition method
Zhang Tao1, Lin Chengyan1, Zhang Xianguo1, Yu Jingfeng2, Lu Xianrong3, Zhang Shouxiu4
1. School of Geosciences,China University of Petroleum(East China),Qingdao,Shandong 266555,China;
2. Exploration and Development Research Institute,Xinjiang Oilfield Company,PetroChina,Karamay,Xinjiang 834000,China;
3. Institute of Geoscience,Jiangsu Oilfield Branch Co.,Sinopec,Yangzhou,Jiangsu 225012,China;
4. Dongxin Oil Production Plant,Shengli Oilfield Branch Co.,Sinopec,Dongying,Shandong 257000,China
Abstract：In clastic formation of Area T,high GR reservoirs are found.The GR log difference between these reservoirs and mudstones is so little that it is hard to tell high GR reservoirs from mudstones.In this study,rock constituents of high GR reservoirs are analyzed and are compared with these of nonreservoirs.The genesis factors of high GR reservoirs are concluded as the increase of pyroclastics,the change of clay types and the absorption effect of clay particles.With the above study,two methods,Pe-GR cross plot analysis and volume model are used to interpret these high GR reservoirs.The former method is based on the insensitiveness of Pe on radioactivity.In the latter method,overdetermined equation groups are constructed and volume contents of the equivalent components can be obtained by resolving these equation groups.This study established effective solutions for high GR reservoir identification.
张涛, 林承焰, 张宪国, 于景锋, 卢显荣, 张守秀. 高伽马值储层成因分析及识别方法[J]. 石油地球物理勘探, 2012, 47(3): 491-495.
Zhang Tao, Lin Chengyan, Zhang Xianguo, Yu Jingfeng, Lu Xianrong, Zhang Shouxiu. Genesis analysis of high GR reservoir and its well-log based recognition method. OGP, 2012, 47(3): 491-495.
