Effects of wettability and pore water occurrence of gas storage space of shale reservoirs

被引：0
|
作者：
Fan Y. [1 ]
Chen L. [1 ]
Liu K. [1 ,2 ]
Yu L. [1 ,3 ,4 ]
Liu J. [1 ]
机构：
[1] Key Laboratory for Deep Oil and Gas, China University of Petroleum(East China), Qingdao
[2] Qingdao National Laboratory for Marine Science and Technology, Qingdao
[3] Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi
[4] State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Wuxi
来源：
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2022年 / 53卷 / 09期
关键词：
continental shale; marine-continental transitional shale; pore structure; pore water; wettability;
D O I：
10.11817/j.issn.1672-7207.2022.09.022
中图分类号：
学科分类号：
摘要：
Aiming at the problems of relatively developed pores, high gas bearing content but poor development effect of continental and marine-continental transitional facies shale gas reservoirs in Sichuan Basin, the impact of reservoir pore wettability and pore water occurrence on the pore structure of effective reservoir space in shales were systematically studied, which was combined with field-emission scanning electron microscope observation, fluid spontaneous imbibition experiment, humidity equilibration and low-pressure gas adsorption experiments. The results show that the marine-continental transitional Longtan Formation shales have strong water wettability, while the continental Daanzhai shale reservoirs exhibit a strong oil wettability. In the two shale intervals, the pores of clayey shales show the strongest water wetting behavior, followed by the mixed shales and siliceous shales, while the calcareous shales are the least water wetting. The effective storage space of shale reservoirs in Longtan Formation and Daanzhai Member can decrease by 60%−80% on average in the presence of pore water, greatly influencing the storage capacity. Micropores appear to be the main storage space of pore water. The influence of pore water occurrence on the total pore volume of marine-continental transitional Longtan Formation shales is greater than that of the continental Daanzhai Member shales. The influence of pore water occurrence on the storage capacity of calcareous shales, siliceous shales, mixed shales and clayey shales increases progressively. High mass fraction of clay mineral is the main factor to enhance the water wettability of pores, which will lead to more water stored in the pores and affect the pore structure of shale effective storage space. © 2022 Central South University of Technology. All rights reserved.
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页码：3575 / 3589
页数：14
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