Article
Geosciences, Multidisciplinary
Yuxin Hao, Rebecca Bell, Ying Rao, Rui Fan, Yanghua Wang
Summary: By utilizing combined geological and geophysical methods, the characteristics, distribution, and controlling factors of karst reservoirs in the Yuanba gas field of the northern Sichuan Basin were studied. It was found that the seismic attributes, geophysical response, and karst distribution exhibited a strong correlation with paleo geomorphology, fault distribution, and gas contents.
MARINE AND PETROLEUM GEOLOGY
(2023)
Article
Geochemistry & Geophysics
Xinya Yu, Dancheng Zhu, Huayao Zou, Fang Hao
Summary: Thermochemical sulfate reduction (TSR) commonly occurs in dolostone reservoirs in the Yuanba gas field in Sichuan Basin. The source of sulfate required for TSR is still debated. Through sulfur and strontium isotopic measurements, it was found that the formation of celestites is likely related to bacterial sulfate reduction (BSR). During the end-Permian regression, brine reflux resulted in the precipitation of S-34-rich celestites in the fractures and vugs of dolostone reservoirs. These findings provide a new explanation for the source of sulfate needed for late TSR.
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
Energy & Fuels
Dong Wang, Hong Liu, Song Tang, Jinhao Bai, Gang Zhou, Zhengyong Li, Feng Liang, Xiucheng Tan, Chao Geng, Ying Yang
Summary: Based on a comprehensive analysis of various data, this study conducted a systematic investigation on the sequences of the Changxing Formation in central Sichuan Basin, identifying and comparing the sedimentary architectures of intra-platform shoal and establishing a sedimentary evolution model. The results provide valuable insights for the exploration of intra-platform shoal reservoirs in this area.
PETROLEUM EXPLORATION AND DEVELOPMENT
(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
Geosciences, Multidisciplinary
Ping Gao, Xianming Xiao, Guangming Meng, Gary G. Lash, Shuangjian Li, Yueqing Han
Summary: Quartz is essential for the reservoir properties of organic mudstones and plays a crucial role in shale gas production. However, the types and origins of quartz in deeply-buried mudstones in South China are poorly understood. A study of mudstone samples from the Upper Permian Dalong Formation in the Sichuan Basin revealed the presence of six major forms of quartz, of which five are authigenic. Authigenic quartz affects pore development and preservation in shale reservoirs, and moderate abundance of authigenic quartz is most favorable for pore development in deep mudstones. The DL mudstone deposits, enriched in organic matter and containing moderate contents of authigenic quartz, are especially promising targets for shale gas exploration.
MARINE AND PETROLEUM GEOLOGY
(2023)
Article
Energy & Fuels
Xiao-Fei Hu, Hu-Cheng Deng, Jian-Hua He, Zhong-Min Shen, Xian-Feng Peng
Summary: This study investigates the complex multiperiod fractures in the Middle Triassic Leikoupo Formation in the western Sichuan Basin Depression. The characteristics and types of natural fractures, as well as their interactions, are determined. The study also identifies four tectonic periods of fractures and discusses the influence of natural fractures on gas migration and well production.
Article
Multidisciplinary Sciences
Jie Tian, Hongqi Liu, Liang Wang, Liqiang Sima, Shiqiong Liu, Xiangjun Liu
Summary: The Da'anzhai Member of the Jurassic Ziliujing formation in central Sichuan is a typical tight-oil reservoir with well-developed fractures in micro- and nano-scale. The study found that the microscopic composition of shelly grains and calcite grains separately control the development of different types of fractures, and established a method to predict fracture characteristics in tight-oil reservoirs using well-logs.
SCIENTIFIC REPORTS
(2021)
Article
Energy & Fuels
Dai Jinxing, Ni Yunyan, Liu Quanyou, Wu Xiaoqi, Gong Deyu, Hong Feng, Zhang Yanling, Liao Fengrong, Yan Zengmin, Li Hongwei
Summary: The Sichuan Basin is classified as a super gas basin due to its abundant gas source rocks, large remaining recoverable resources, numerous large gas fields, and high total gas production.
PETROLEUM EXPLORATION AND DEVELOPMENT
(2021)
Article
Geosciences, Multidisciplinary
Guangwei Wang, Fang Hao, Huayao Zou, Pingping Li
Summary: This study analyzed the stable isotope compositions of calcite cements in carbonate formations from four carbonate fields in the Sichuan Basin. The results showed that some calcite cements had similar δ18O values to their host carbonates, despite forming at high temperatures (>100 degrees C). Petrographic and geochemical analysis indicated that the δ18O-enriched calcites were commonly associated with solid bitumens and had lower δ13C values, suggesting the involvement of thermochemical sulfate reduction. Based on the findings, a model for oxygen isotope behavior during thermochemical sulfate reduction was established.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Environmental Sciences
Benjamin Hmiel, David R. Lyon, Jack D. Warren, Jevan Yu, Daniel H. Cusworth, Riley M. Duren, Steven P. Hamburg
Summary: This study examines the methane emissions from oil and gas production in the Permian Basin and finds significant variations in emission intensity among different companies. It shows that nearly half of the operators have improved their performance by over 50% from 2019 to 2021.
ENVIRONMENTAL RESEARCH LETTERS
(2023)
Article
Energy & Fuels
Zecheng Wang, Yizuo Shi, Long Wen, Hua Jiang, Qingchun Jiang, Shipeng Huang, Wuren Xie, Rong Li, Hui Jin, Zhijie Zhang, Zengmin Yan
Summary: Based on the analysis of the petroleum system, resource distribution, and development scheme in the Sichuan Basin, it is concluded that the basin has abundant natural gas resources and the potential to be developed using the Super Basin paradigm. Advancements in technology regarding deep and ultra-deep carbonate reservoirs, tight-sand gas, and shale oil are essential for larger scale hydrocarbon exploration and production. Pertinent exploration strategies, government support, and new cooperative patterns are necessary for unlocking the full hydrocarbon potential of the basin. The Super Basin Thinking provides references and guidelines for further deployment of hydrocarbon exploration and production in the Sichuan Basin and other developed basins.
PETROLEUM EXPLORATION AND DEVELOPMENT
(2022)
Article
Energy & Fuels
Xuewen Shi, Wei Wu, Qiuzi Wu, Kesu Zhong, Zhenxue Jiang, Huan Miao
Summary: This study investigates the enrichment mechanism and forming type of deep shale gas in the Longmaxi Formation shale in the Desheng-Yunjin Syncline area of the Sichuan Basin. The research analyzes the mineralogy, organic geochemistry, physical properties, and gas and water content of the shale, as well as the influence of sedimentation, structural conditions, and hydrogeological conditions on gas enrichment. The results show that the shale in this area is a good hydrocarbon source rock with specific characteristics. Tectonic activities and hydrodynamic conditions have a significant impact on shale gas enrichment.
Article
Geosciences, Multidisciplinary
Qiqi Li, Bin Li, Wenhua Mei, Yiling Liu
Summary: Fold-and-thrust belts are important for oil and gas exploration, but the complex sources and histories make the exploration risk high. This study analyzes geochemical data from various strata in the NW Sichuan Basin to investigate the sources and genetic types of natural gas. The study finds significant differences in the gas origin between different structural belts. The results will contribute to a better understanding of the petroleum system in fold-and-thrust belts and optimize future exploration strategies.
MARINE AND PETROLEUM GEOLOGY
(2022)
Article
Energy & Fuels
Dingye Zheng, Xiongqi Pang, Bing Luo, Dongxia Chen, Bo Pang, Hongyu Li, Rui Yu, Fangxin Guo, Wei Li
Summary: This study investigated the geochemical characteristics, genetic types, and gas-source relations of natural gas in the Sinian Dengying Formation in the Sichuan Basin, China. The results showed that the natural gas in this area is mainly dry gas with the potential of being gas-rich.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2021)
