Article
Geosciences, Multidisciplinary
Gu Yifan, Jiang Yuqiang, Lei Xiaohua, Chen Zhiyong, Zhou Lu, Fu Yonghong, Jiang Zengzheng
Summary: This study conducted a comprehensive analysis of different oolitic shoal reservoir types of the Feixianguan Formation, revealing the characteristics and evolutionary pathways of residual-oolitic dolomite, mold-oolitic dolomite, and sparry oolitic limestone reservoirs. The quality of reservoirs varied among the different types, with residual-oolitic dolomite reservoirs having the best quality and sparry oolitic limestone reservoirs having the poorest. The formation of these reservoirs was found to be controlled by different processes such as seawater seepage-reflux dolomitization and burial dissolution of organic acids.
ACTA GEOLOGICA SINICA-ENGLISH EDITION
(2021)
Article
Geosciences, Multidisciplinary
Guanxiong Ren, Qirong Qin, Qiang Zhang, Yanbo Guo, Zhaoyang Ye
Summary: Based on core and thin section observation, four types of lithofacies can be recognized in the Feixianguan Formation oolitic reservoir, with Lithofacies D possessing the best pore-throat structure and reservoir connectivity. The origin of different lithofacies is controlled by meteoric freshwater leaching and dolomitization, with Lithofacies B being dominantly influenced by freshwater leaching and Lithofacies C being controlled by seepage-reflux and hydrothermal dolomitization fluids.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Geology
Mingtao Zuo, Zhonggui Hu, Mingyi Hu, Xing Niu, Qingmin Dong
Summary: The study of the granular shoal deposits of the Feixianguan Formation in the southwestern section of the Kaijiang-Liangping Trough in the Sichuan Basin revealed sequence stratigraphy, sedimentary characteristics, and distribution features. The Feixianguan Formation developed in a carbonate platform setting, with identified sequence boundaries and systems tracts in each third-order sequence.
CARBONATES AND EVAPORITES
(2021)
Article
Engineering, Marine
Xiuquan Hu, Hong Liu, Xiucheng Tan, Chenjing Xiao, Qian Tan, Jianghan Li, Chi Yi
Summary: The accurate characterization of shoal sediments is important due to erosion and difficulty in calculating the real thickness of granular shoals. This study describes the type and distribution range of carbonate rock shoal facies using the shoal-to-strata ratio. It concludes that platform margin shoals have the highest shoal-to-strata ratio and greater exploration potential. The shoal-to-strata ratios are more accurate than using shoal thickness to characterize sedimentary facies. The planar distribution diagram of the shoal-to-strata ratio can be used as a supporting map for sedimentary facies mapping.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Energy & Fuels
Hao Peng, Cheng Yin, Yuan Zhong, Yue-Ming Yang, Liang Xu, Yang Luo, Xin Hu, Jun Fan
Summary: This study proposed a new genetic model for the deposition of the Lower Triassic Feixianguan Formation in the northwestern Sichuan Basin, highlighting the carbonate ramp. It was found that a large-scale regional regression occurred at the end of the Late Permian, leading to changes in sedimentary patterns during the Early Triassic.
ENERGY EXPLORATION & EXPLOITATION
(2021)
Article
Geology
Qingmin Dong, Zhonggui Hu, Shiyue Chen, Baoguo Yuan, Xin Dai
Summary: Reef-shoal reservoirs of the Changxing-Feixianguan Formation in the Sichuan Basin are important for oil and gas exploration. The reservoirs are mainly classified into complete and incomplete reef-shoal combinations, with favorable reservoir facies found in the platform margin reef facies and platform margin shoal facies. Sedimentation and diagenesis play crucial roles in the formation of high-quality reservoirs.
CARBONATES AND EVAPORITES
(2021)
Article
Geosciences, Multidisciplinary
Ling Zhou, Guangwei Wang, Ya Zhang, Yanping Qiao, Fang Hao, Rui Xu, Li Quan, Ping Wang
Summary: Petrographic observation and geochemical analysis were conducted on dolostones from the high-quality reservoirs of the Feixianguan Formation in the northeast Sichuan Basin. The study revealed that the dolomitizing fluids originated from evaporated seawater and coeval seawater with the Feixianguan limestone, indicating the formation mechanism of the dolostones. Additionally, the presence of exogenous non-seawater fluids in the burial environment was also identified.
MARINE AND PETROLEUM GEOLOGY
(2023)
Article
Energy & Fuels
Zi-Yun Zheng, Yin-Hui Zuo, Hua-Guo Wen, De-Ming Li, Yang Luo, Jia-Zhen Zhang, Mei-Hua Yang, Jian-Cheng Zeng
Summary: There is a controversial debate about the origin and source of natural gas in the Lower Triassic Feixianguan Formation in the Eastern Sichuan Basin. This issue hinders the study of natural gas dynamics and exploration in the region, calling for further research. By conducting experimental tests and using gas chromatography and mass spectrometry, the geochemical characteristics and genetic identification of the Feixianguan Formation were studied. Based on the thermal history and basin simulation technology, the histories of gas generation and expulsion were restored, and a gas accumulation model was established. The results provide insights into the natural gas dynamics in the Feixianguan Formation in the Eastern Sichuan Basin.
Article
Geosciences, Multidisciplinary
Minglei Yang, Xinya Yu, Dancheng Zhu, Ke Long, Chaojin Lu, Huayao Zou
Summary: This study investigates the distribution and reservoir characteristics of microbial carbonates in the upper submember of the Middle Triassic Leikoupo Formation in the western Sichuan Basin. It identifies high-quality reservoirs in the central area (regressive microbialites) and northern area (intraclast dolograinstone). The study proposes a depositional framework for microbialites and evaluates its control on reservoir quality, which is significant for further research on microbial carbonate reservoirs.
MARINE AND PETROLEUM GEOLOGY
(2023)
Article
Geosciences, Multidisciplinary
Pingping Li, Huayao Zou, Xinya Yu, Fang Hao, Guangwei Wang
Summary: Dolostone reservoirs in the NE Sichuan Basin have been identified as the main natural gas exploration targets in both the east and west platform edges of the Kaijiang-Liangping trough. The dolomitization fluids were likely sourced from fluids similar to coeval seawater, with potentially oxidizing conditions and evaporated seawater from an evaporite platform contributing to the dolomitization process.
MARINE AND PETROLEUM GEOLOGY
(2021)
Article
Geosciences, Multidisciplinary
Guangwei Wang, Fang Hao, Wenbo Zhang, Huayao Zou, Pingping Li
Summary: The economic importance of micropores with a diameter less than 10 μm in petroleum reservoirs has attracted attention in hydrocarbon exploration. The Feixianguan Formation in the Jiannan gas field is a typical micropore-dominated reservoir, which has been productive for gas storage and production for the past 40 years.
MARINE AND PETROLEUM GEOLOGY
(2022)
Article
Geosciences, Multidisciplinary
Pingping Li, Bisong Li, Jinbao Duan, Yizhen Zhao, Huayao Zou, Fang Hao
Summary: This study investigates the sulfate sources of thermochemical sulfate reduction (TSR) and the distribution of hydrogen sulfide (H2S) in the Changxing and Feixianguan formations in the Sichuan Basin, using geochemical and isotopic data. The results indicate that H2S is mainly derived from TSR, and the isotopic values suggest liquid hydrocarbon dominated-TSR. The study also finds that the sulfates required for TSR are likely derived from evaporative seawater, and dolostone reservoirs play a role in enriching sulfates during dolomitization. The distribution of H2S is controlled by sulfate distributions and paleo-oil accumulations, with the eastern and western platforms being the most H2S-enriched areas.
MARINE AND PETROLEUM GEOLOGY
(2022)
Article
Geology
Alberto Perez-Lopez, Constantino Benedicto, Federico Orti
Summary: The eastern sector of the Mesozoic Iberian basin belongs to the 'Mediterranean type' Triassic, characterized by a stratigraphic record with two carbonate Muschelkalk units. The evolution of the platform morphology from an epicontinental platform to a lower energy rimmed shelf is depicted through the deposition of shallow-water carbonates and tidal/lagoon environments.
SEDIMENTARY GEOLOGY
(2021)
Article
Energy & Fuels
Wenli Xu, Huaguo Wen, Ziye Lu, Kexiu Zhong, Qingping Feng, Bing Luo, Yisha Liao, Gang Zhou
Summary: The Lower Triassic Jialingjiang Formation in the eastern Sichuan Basin is characterised by a carbonate-evaporite succession. This study identified several diagenetic events including dolomitisation, anhydrite/gypsum replacement/cementation, and calcite cementation. Dolomitisation helps preserve reservoir porosity, while anhydrite is the major diagenetic event destroying porosity.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Geosciences, Multidisciplinary
Jihad Hamd, Adrian Cerepi, Rudy Swennen, Corinne Loisy, Serge Galaup, Lea Pigot
Summary: This paper studies the sedimentary and diagenetic factors controlling the heterogeneity and petrophysical properties of carbonate reservoir systems. The research findings show that diagenetic processes such as dolomitization play a crucial role in the development of porosity and permeability in reservoir rocks.
MARINE AND PETROLEUM GEOLOGY
(2022)