Late Permian-Early Triassic Sedimentary Evolution in Sichuan Basin and Its Significance on Gas Accumulation(PDF)
《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]
- Issue:
- 2015年第04期
- Page:
- 44-53
- Research Field:
- 基础地质与矿产地质
- Publishing date:
Info
- Title:
- Late Permian-Early Triassic Sedimentary Evolution in Sichuan Basin and Its Significance on Gas Accumulation
- Author(s):
- FENG Chong; ZOU Hua-yao; GUO Tong-lou
- 1. Postdoctoral Workstation, Xinjiang Oilfield Company, PetroChina, Karamay 834000, Xinjiang, China; 2. Department of Petroleum Engineering, Karamay Vocational and Technical College, Karamay 834000, Xinjiang, China; 3. State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing 102249, China; 4. Exploration Southern Company, SINOPEC, Chengdu 610041, Sichuan, China
- Keywords:
- sedimentary evolution; source rock; reservoir; reef-shoal facies; bay facies; favorable area; carbonate rock; Sichuan Basin
- PACS:
- P618.130.2;TE122
- DOI:
- -
- Abstract:
- Upper Permian-Low Triassic carbonate formations in Sichuan Basin enrich gas, and the distribution of gas accumulation is controlled by high quality source rocks and reef-shoal facies reservoir. In order to reveal the gas enrichment rule and forecast the favorable areas under the sedimentary evolution settings in Sichuan Basin, the geological structure settings of Late Permian-Early Triassic Yangtze palaeoslab were analyzed, and the characteristics of Late Permian-Early Triassic sedimentary evolution under the geological structure settings were discussed; the development mechanism and distribution of high quality source rocks and reservoirs were explained according to the characteristics of tectonic evolution in different periods; combined with the gas accumulation model, the favorable areas of gas accumulation were divided. The results show that the development evolution of Late Permian-Early Triassic bay and shelf in Sichuan Basin controls the development and distribution of major source rocks in Longtan Formation and reef-shoal facies reservoirs in Changxing Formation-Feixianguan Formation, and the lower-generating and upper-reservoiring are favorable source-reservoir matching combination; the platform margin reef-shoal facies reservoir in Changxing Formation-Feixianguan Formation of Northeast Sichuan nearby the high quality source rocks of bay facies in Longtan Formation is the most favorable area for gas accumulation. In general, the characteristics of Late Permian-Early Triassic sedimentary evolution in Sichuan Basin control the development and distribution of marine facies high quality source rocks and reservoirs, and then determine the enrichment and distribution of gas.
Last Update: 2015-07-20