Lithologic Reservoirs ›› 2024, Vol. 36 ›› Issue (1): 111-120.doi: 10.12108/yxyqc.20240111

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Restoration and characteristics of karst paleogeomorphology of Middle Permian Maokou Formation in southern Sichuan Basin

ZHANG Tan1, JIA Mengyao1, SUN Yaxiong2,3, DING Wenlong4, SHI Siyu5, FAN Xinyu1, YAO Wei1   

  1. 1. Wuxi Research Institute of Petroleum Geology, Sinopec, Wuxi 214126, Jiangsu, China;
    2. Jiangsu Oilfield Company, Sinopec, Yangzhou 225009, Jiangsu, China;
    3. College of Geoscience, Northeast Petroleum University, Daqing 163318, Heilongjiang, China;
    4. School of Energy Resources, China University of Geosciences(Beijing), Beijing 100083, China;
    5. Sinopec Exploration Company, Chengdu 610041, China
  • Received:2022-10-09 Revised:2022-11-09 Online:2024-01-01 Published:2024-01-02

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Abstract: Karst paleogeomorphology is one of the main controlling factors of sedimentary microfacies type, distribution range and reservoir development in petroliferous basins. It is very important to restore karst palaeogeomorphology to guide oil and gas exploration. Based on a large number of drilling, logging and seismic data, the denudation thickness of the unconformity interface at the top of Middle Permian Maokou Formation in southern Sichuan Basin was calculated by using sedimentation rate method and stratum thickness comparison method, and the karst paleogeomorphology units were divided according to the regional differences of the denudation thickness and paleogeomorphic indicators. The results show that:(1) The top of Middle Permian Maokou Formation in southern Sichuan Basin mainly developed parallel unconformities, and only formed angular unconformity in local areas. Under the background of stable sedimentation and weak tectonic movement in Upper Yangtze platform during Early and Middle Permian, sedimentation rate method and stratum thickness comparison method are relatively more suitable for the restoration of karst palaeogeomorphology in the study area.(2) The denudation thickness of the top of Middle Permian Maokou Formation in the study area changes from 0 to 120 m. The strongest denudation areas are near the wells LG1 and W4 in the north, which represent the highest position of the karst ancient landform. The denudation intensity gradually weakens towards the southeast, and the terrain gradually decreases. The weakest denudation areas are located in the northeast of well LS1, which represents the lowest position of the karst ancient landform. The overall landscape pattern is "high in the north, low in the south and lowest in the northeast".(3) The paleogeomorphology of Maokou Formation in the study area controls the intensity of karst development, which can be divided into three secondary karst paleogeomorphic units, namely, karst highlands, karst slopes and karst basins, and seven tertiary paleogeomorphic units, including karst peak basins, karst hill depressions, hill cluster valleys, hill cluster depressions, hill cluster gullies, peak forest plains and residual hill plains. Among them, the karst slopes are easy to form good reservoir spaces, laying a good foundation for the formation of oil and gas traps, and are the next favorable exploration direction.

Key words: sedimentary ratio method, stratum thickness comparison method, paleogeomorphologic restoration, karst reservoir, Maokou Formation, Middle Permian, southern Sichuan Basin

CLC Number: 

  • TE122.1
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