Oolitic shoal complexes characterization of the Lower Triassic Feixianguan Formation in the Yuanba Gas Field,Northeast Sichuan Basin,China |
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| Institution: | 1. School of Geoscience and Technology, Southwest Petroleum University, Chengdu, 610500, China;2. Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education, China University of Geosciences(Wuhan), Wuhan, 430074, China;3. Southern Exploration and Development Division Company of SINOPEC, Chengdu, 610041, China;4. Chengdu University of Technology, Chengdu, 610059, China;5. Jianghan Oil Field Branch Company of SINOPEC, Qianjiang, 433124, China;1. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Changping, Beijing 102249, China;2. Sinopec Exploration Company, Chendu, Sichuan 610041, China;3. Key Laboratory of Tectonics and Petroleum Resources, Ministry of Education, China University of Geosciences, Wuhan 430074, China;1. State Key Laboratory of Petroleum Resources and Engineering in China University of Petroleum at Beijing, Beijing, 102249, China;2. MOE Key Laboratory of Petroleum Engineering, China University of Petroleum (Beijing), Beijing, 102249, PR China;3. National Engineering Research Center of Coalbed Methane Development & Utilization, Beijing, 100095, China;4. PetroChina Coalbed Methane Company Limited, Beijing, 100028, China |
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| Abstract: | The Yuanba Gas Field is the second largest natural gas reservoir in the Sichuan Basin, southwest China. The vast majority of the natural gas reserve is from the Permian Changhsingian reef complexes and Lower Triassic Feixianguan oolitic shoal complexes. To better understand this reservoir system, this study characterizes geological and geophysical properties, spatial and temporal distribution of the oolitic shoal complexes and factors that control the oolitic shoals character for the Lower Triassic Feixianguan Formation in the Yuanba Gas Field. Facies analysis, well-seismic tie, well logs, seismic character, impedance inversion, and root mean square (RMS) seismic attributes distinguish two oolitic shoal complex facies – FA-A and FA-B that occur in the study area. FA-A, located in the middle of oolitic shoal complex, is composed of well-sorted ooids with rounded shape. This facies is interpreted to have been deposited in shallow water with relatively high energy. In contrast, FA-B is located in flanks of the oolitic shoal complex, and consists of poorly sorted grains with various shape (rounded, subrounded and subangular). The oolitic shoal complexes were mainly deposited along the platform margin. From the early Fei 2 Member period to the late Fei 2 Member period, the oolitic shoals complexes on the platform margin gradually migrated from the southwest to the northeast with an extent ranging from less than 100 km2–150 km2 in the Yuanba Gas Field. The migration of oolitic shoals coincided with the development of a series of progradational clinoforms, suggesting that progradational clinoforms caused by sea-level fall maybe are the main reason that lead to the migration of oolitic shoals. Finally, this study provide an integrated method for the researchers to characterize oolitic shoal complexes by using well cores, logs, seismic reflections, impedance inversion, and seismic attribute in other basins of the world. |
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| Keywords: | Oolitic shoal Feixianguan Formation Lower Triassic Northeast Sichuan Basin |
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