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Volume 44 Issue 4
Jul.  2022
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Article Navigation >  PETROLEUM GEOLOGY & EXPERIMENT  > 2022  >  44(4): 655-665
LIN Tong, TAN Cong, WANG Tongshan, LI Qiufen, FENG Mingyou, HUANG Shiwei, DONG Jinghai. Differential hydrocarbon accumulation and its influence on the formation of gas reservoirs in the Longwangmiao Formation, central Sichuan Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2022, 44(4): 655-665. doi: 10.11781/sysydz202204655
Citation: LIN Tong, TAN Cong, WANG Tongshan, LI Qiufen, FENG Mingyou, HUANG Shiwei, DONG Jinghai. Differential hydrocarbon accumulation and its influence on the formation of gas reservoirs in the Longwangmiao Formation, central Sichuan Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2022, 44(4): 655-665. doi: 10.11781/sysydz202204655
shu

Differential hydrocarbon accumulation and its influence on the formation of gas reservoirs in the Longwangmiao Formation, central Sichuan Basin

doi: 10.11781/sysydz202204655
  • 1.

    PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China

  • 2.

    College of Geoscience and Technology, Southwest Petroleum University, Chengdu, Sichuan 610500, China

  • 3.

    Exploration Department of Daqing Oilfield Co. Ltd., Daqing, Heilongjiang 163453, China

  • Received Date: 2021-07-27
  • Rev Recd Date: 2022-05-31
  • Publish Date: 2022-07-28
    Abstract
  • The Longwangmiao gas reservoirs have significant differences in various structural positions in the Anyue gas field of the Sichuan Basin including diversities of pressure system, gas-water interface, bitumen content and charging time. By determining the diagenetic sequence of rocks and minerals, analyzing inclusion components by Raman spectrum, calculating capture temperature, and restoring regional tectonic evolution process, comparative analyses of the charging evolution process of liquid and gas hydrocarbon were carried out. Results show that (1) Three distinct pressure systems exist in gas reservoirs in the central Sichuan Basin. Gas-bearing zones and water-bearing zones separately distributed. The average pressures of gas reservoirs decrease gradually from north to south, and the three pressure systems have independent gas-water interfaces. (2) The initial charging temperatures of hydrocarbons varied in different gas bearing systems.The temperature during liquid hydrocarbon charging was higher in the west and lower in the east, and the accumulation evolution process was different from west to east. The charging temperature during liquid hydrocarbon cracking of gaseous hydrocarbon was higher in the east and west, and slightly lower in the middle. Based on the division of pressure zones of the Longwangmiao gas reservoir and the determination of gas-water boundary value, the distribution range of effective gas reservoirs was predicted for different gas-bearing systems, which provided guidance for further exploration and deployment.

     

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