ORIGINAL RESEARCH article
Front. Earth Sci.
Sec. Georeservoirs
Volume 13 - 2025 | doi: 10.3389/feart.2025.1456597
This article is part of the Research TopicAdvancements in Carbonate Geology: Depositional settings, Sedimentology, Chemostratigraphy, Reservoir Characterization, and Environmental SustainabilityView all 7 articles
Characteristics and Genetic Model of Dolomite Reservoir in the Qigebulak Formation, Upper Sinian, Tarim Basin, China
Provisionally accepted
- College of Geosciences, China University of Petroleum, Beijing, China
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In recent years, Oil and gas has developed into ultra–deep fields. Thick primary dolomite is developed in the Qigebulak Formation of the Tarim Basin, but there is little research on the petrological characteristics and reservoir genetic mechanism of the primary dolomite. The Qigebulak Formation composes upper, middle, lower member, and the dolomite can be divided into crystalline dolomite, grain dolomite and algal framework dolomite. The analysis of petrological and geochemical characteristics show that dolomites in the middle member retain the geochemical characteristics of original deposition. Sedimentation is the foundation and premise of reservoir development. Effective reservoirs are mainly developed in the grain banks and microbial mounds, and the reservoir spaces are mainly algal framework pores and intergranular pores. Supergene karstification is the key to the reservoir, and the upper Qigebulak Formation experienced strong surface dissolution. Under high temperature and high pressure during the burial stage, the source rocks of the Yuertusi Formation dissolved and formed organic acidic fluids. The dissolution of acidic fluids promoted the improvement of reservoir physical properties. Based on the comprehensive analysis of the controlling factors of reservoir development, the reservoir genetic model is established. The dolomite reservoir of the Qigebulak Formation is developed under the control of sedimentation, supergenetic dissolution, burial dissolution.
Keywords: Primary dolomite, Reservoir controlling factors, Genetic model of dolomite reservoir, Upper Sinian, Tarim Basin
Received: 28 Jun 2024; Accepted: 31 Mar 2025.
Copyright: © 2025 Zongfeng, Bao, Su, Ban, Li, Wang, Tao, Wei and Lu. 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:
Li Zongfeng, College of Geosciences, China University of Petroleum, Beijing, China
Zhidong Bao, College of Geosciences, China University of Petroleum, Beijing, China
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