Lithologic Reservoirs ›› 2023, Vol. 35 ›› Issue (5): 139-152.doi: 10.12108/yxyqc.20230514

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Geochemical characteristics and sedimentary environment of source rocks of Permian Dalong Formation in northern Sichuan Basin

GUO Jinhao1,2, HU Guoyi1,2, HE Kun1,2, MI Jingkui1,2, TIAN Lianjie1,2, HE Fei1,2, GUO Chuyuan3, LU Mengdie3   

  1. 1. PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China;
    2. Key Laboratory of Petroleum Geochemistry, CNPC, Beijing 100083, China;
    3. China University of Mining and Technology (Beijing), Beijing 100083, China
  • Received:2023-03-03 Revised:2023-05-11 Online:2023-09-01 Published:2023-09-28

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Abstract: Through systematic sampling and geochemical characteristics analysis of three field profiles of Upper Permian Dalong Formation in northern Sichuan Basin，the sedimentary environment of source rocks was analyzed from four aspects of sedimentary background，hydrothermal activity and upwelling，paleoclimate and paleosalinity， and water environment，and the organic matter accumulation model and exploration potential were discussed. The results show that：（1）The Permian Dalong Formation in northern Sichuan Basin has argillaceous and siliceous source rocks with an effective thickness of 10-40 m，a high abundance of organic matters（the average content of organic carbon is 4.58%）， good types of organic matters（type Ⅱ2 organic matter is dominant）， and great hydrocarbon generation potential（the average pyrolysis hydrocarbon generation potential is 5.90 mg/g）. The Changjianggou profile and Xibeixiang profile in Guangyuan area at the margin of Sichuan Basin are in mature stage，with Ro values of 0.72% and 1.06%，respectively. The average Tmax value of Daliangxiang profile in the eastern part of the basin is 604 ℃，reaching an over mature stage. The gas generation of Dalong Formation in Guangyuan-Liangping trough reaches 432.38×1012 m3，with conventional natural gas resource of 1.70×1012 m3 and shale gas resource in trillions of cubic meters，which is a set of marine high-quality source rocks with large gas potential.（2）The high-quality source rocks of Dalong Formation in the study area were formed in a continental margin environment with semi-limited cycle of water hypoxia，and experienced two stages of the evolution of water environment，including embryonic stage and expansion stage of the trough development. In the early stage，there was anoxic-local anaerobic-anoxic unvulcanized and sulphide environment，and organic matter was not developed. In the middle and late stages，there was an oxygen-poor-anoxic-main anaerobic-anoxic environment. Organic matter enrichment was closely related to hydrothermal activity and upwelling. The acid gas from volcanic eruptions and the semi enclosed water environment jointly formed a long-term and large-scale anaerobic hydrodesulfurization environment，which was conducive to the enrichment and preservation of organic matters. It shows a high TOC value in the slope shelf areas such as Xibeixiang and Changjianggou. The TOC value is the greatest in the weak sulfuration environment，followed by the moderate sulfuration environment，and the TOC value is the smallest in a strong retention vulcanization environment.（3）Shale gas of Dalong Formation and high-quality reservoir gas from Changxing-Feixianguan Formation in Guangyuan-Liangping trough are the main exploration directions.

Key words: geochemical characteristics, hydrocarbon generation potential, hypoxic semi-limited environment, hydrothermal activity, organic matter enrichment model, Dalong Formation, Upper Permian, Guangyuan-Liangping trough, northern Sichuan Basin

CLC Number: 

  • TE122.1+13
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