ORIGINAL RESEARCH article
Front. Earth Sci.
Sec. Petrology
Volume 13 - 2025 | doi: 10.3389/feart.2025.1572136
Classification and origin of pore throat systems in tight sandstone reservoirs: A case study of the Xujiahe Formation in the northeastern Sichuan Basin, China
Provisionally accepted
Youzhi Wang1*
Xiandong Wang1Xuqiang Chen1Xiaohui Li1Jingfeng Wu1Xiang Gao1Jianliang Peng1Biao Wang1Yingyi Xie1
Haiguang Wu2- 1China Petroleum Daqing Oilfield Exploration and Development Research Institute, Daqing, China
- 2School of Earth Sciences, Northeast Petroleum University, Daqing, China
Select one of your emails
You have multiple emails registered with Frontiers:
Notify me on publication
Please enter your email address:
If you already have an account, please login
You don't have a Frontiers account ? You can register here
The reservoirs of the Xujiahe Formation in the northeastern Sichuan Basin have complex rock components, strongpore-throat inhomogeneity, and large differences in production capacity between wells, and the mechanism of high-quality pore-throat development must be clarified to support well deployment. Taking the tight sandstone reservoirs of the Xu-2 member of the Xujiahe Formation as the research object, this study establishes a pore throat systems classification, reveals the origins of various pore throat systems, and conducts a microscopic analysis of the pore structure through thin sections, mercury intrusion capillary pressures, and nuclear magnetic resonance studies.The results show that four main types of reservoir spaces can be found in the cast thin section, including primary InterP pores, residual InterP pores, dissolution pores and IntraP pores. By observing the cast thin section, the pore throat system can be classified into 3 categories: InterP pore-throat systems, mixed InterP-dissolutional pore-throat systems, and dissolution-IntraP pore-throat systems. The pore-throat systems of the reservoir are controlled by both the sedimentary environment and diagenesis, strong hydrodynamics, high quartz grain contents, low mud and calcareous clast contents and moderate amounts of volcanic clasts the are favourable for chlorite film formation. A large number of intergranular pores are efficiently maintained, forming an intergranular pore-throat system with the best storage conditions. The research results can guide the study of the formation mechanism of the tight reservoirs in this area, and also provide some reference for the evaluation ofreservoir consistency.
Keywords: Tight sandstone, pore throat systems, Reservoir origin, Xujiahe Formation, Sichuan Basin
Received: 06 Feb 2025; Accepted: 24 Mar 2025.
Copyright: © 2025 Wang, Wang, Chen, Li, Wu, Gao, Peng, Wang, Xie and Wu. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
* Correspondence: Youzhi Wang, China Petroleum Daqing Oilfield Exploration and Development Research Institute, Daqing, China
Disclaimer: All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher.