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Article Navigation >  PETROLEUM GEOLOGY & EXPERIMENT  > 2018  >  40(5): 613-620
SONG Yu, ZHANG Li, LUO Dingwen, YANG Shuo, HAO Fang, ZOU Huayao. Characteristics of overpressure regime in compartmentalized overpressured system within tight sandstones, Xujiahe Formation, Yuanba-Tongnanba areas, Sichuan Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2018, 40(5): 613-620. doi: 10.11781/sysydz201805613
Citation: SONG Yu, ZHANG Li, LUO Dingwen, YANG Shuo, HAO Fang, ZOU Huayao. Characteristics of overpressure regime in compartmentalized overpressured system within tight sandstones, Xujiahe Formation, Yuanba-Tongnanba areas, Sichuan Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2018, 40(5): 613-620. doi: 10.11781/sysydz201805613
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Characteristics of overpressure regime in compartmentalized overpressured system within tight sandstones, Xujiahe Formation, Yuanba-Tongnanba areas, Sichuan Basin

doi: 10.11781/sysydz201805613

  • 1. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China;

  • 2. College of Geosciences, China University of Petroleum, Beijing 102249, China;

  • 3. China University of Petroleum, Dongying, Shandong 257061, China

  • Received Date: 2018-01-13
  • Rev Recd Date: 2018-07-19
  • Publish Date: 2018-09-28
    Abstract
  • Compartmentalized overpressured systems are commonly developed in tight gas sandstones. However, studies about the characteristics of overpressure regime in compartmentalized overpressured system are rarely reported in the literature. The Upper Triassic Xujiahe tight sandstone formation in the Yuanba-Tongnanba area, northeastern Sichuan Basin, is a typical compartmentalized overpressured system. In this study, an overpressure regime in a compartmentalized overpressured system was delineated based on abundant measured pressure data, and the factors controlling overpressure regime in the compartmentalized overpressured system were clarified by comprehensively analyzing the geologic and geochemical data and the structural evolution of source rocks and tight sandstones. Results show that the overpressure regime in the compartmentalized overpressured system within tight sandstones of the Xujiahe Formation were separated from each other in both vertical and horizontal distribution of sandstone intervals, or even in the same intervals, exhibiting multi-scale and multi-level features for the compartmentalized overpressured system. Natural gas filling is a primary dynamic cause for overpressure generation, and its magnitude is directly related to gas generation intensity. The generally densified sandstones formed the background of overpressure system. Locally distributed mudstones and mudstone interbeds, and highly densified sandstone interbeds formed a multi-scale and multi-level framework of the overpressure system.

     

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