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Liaohe Oilfield shale reservoir quality grading with micropore evaluation parameters in Damintun Depression
WANG Weiming1, LU Shuangfang1, TIAN Weichao1, LI Jinbu1, ZHOU Nengwu1, SHAN Junfeng2, HU Yingjie2, MENG Yuanlin3
(1.Research Institute of Unconventional Petroleum and Renewable Energy in China University of Petroleum, Qingdao 266580, China;2.Petroleum Exploration and Development Research Institute, Liaohe Oilfield Company, PetroChina, Panjin 124000, China;3.Department of Geoscience, Northeast Petroleum University, Daqing 163318, China)
Abstract:
Based on experimental approaches including whole-rock XRD and low-temperature nitrogen adsorption, this research targeted three parameters (average pore size, specific surface area and relative content of chlorite) to establish a grading system for the shale reservoirs in Damintun Depression in Liaohe Oilfield, Northeastern China. The results show that the three microscopic parameters share obvious linear relationship between each other. Higher content of chlorite is usually related to larger average pore size. This can be explained that chlorite is rich in Fe, which is chemically active and is capable of attracting lots of organic matters. The organic matters can subsequently turn into organic acid during the maturing and evolution processes to form numerous solution pores. The study also shows an evident trichotomy in the relationship between average pore size and specific surface area:when the average pore size is more than 10 nm,the associated surface area is less than 1 m2/g; When the average pore size ranges between 5 and 10 nm,the specific surface area varies between 1 m2/g and 6 m2/g; and lastly when the average pore size is less than 5 nm,the specific surface area is more than 6 m2/g. Microscopic parameters between specific surface areas and the relative content of chlorite also show clearly linear relation. Consistencies are observed between turning points:relative content of chlorite(5% and 9%), average pore size (5 nm and 10 nm), and specific surface area (6-1 m2/g). The turning points can be used to grade the quality of microspore structures in shale reservoirs.
Key words:  shale reservoir  micro structure  reservoir grading  Liaohe fault  Damintun Depression