Lithologic Reservoirs ›› 2024, Vol. 36 ›› Issue (5): 156-166.doi: 10.12108/yxyqc.20240515

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Characteristics of source rocks and thermal evolution simulation of Permian Pingdiquan Formation in Dongdaohaizi Sag，Junggar Basin

YANG Haibo1, FENG Dehao2,3, YANG Xiaoyi2,3, GUO Wenjian1, HAN Yang1, SU Jiajia2,3, YANG Huang1, LIU Chenglin2,3   

  1. 1. Research Institute of Exploration and Development, PetroChina Xinjiang Oilfield Company, Karamay 834000, Xinjiang, China;
    2. State Key Laboratory of Petroleum Resources and Engineering, China University of Petroleum(Beijing), Beijing 102249, China;
    3. College of Geosciences, China University of Petroleum(Beijing), Beijing 102249, China
  • Received:2023-05-25 Revised:2023-07-17 Online:2024-09-01 Published:2024-09-04

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Abstract: Based on the data of drilling，mud-logging，wire-logging and source rock analysis and testing，the hydrocarbon generation potential and thermal evolution history of the source rocks of the Permian Pingdiquan Formation in Dongdaohaizi Sag of Junggar Basin were systematically studied. The results show that：（1）The hydrocarbon source rocks of the Permian Pingdiquan Formation in Dongdaohaizi Sag of Junggar Basin are mainly darkgray and gray black mudstones，which are dark in color and generally large in thickness. The thickness gradually increases from the northeastern slope area to the center of the sag，and gradually decreases toward the western Mosuowan uplift，with a maximum thickness of 536 m.（2）The organic matter abundance of the source rocks of Pingdiquan Formation in the study area is evaluated as medium to excellent levels，with the highest organic matter abundance in the first member of Pingdiquan Formation in the vertical direction and in Dinan 7 and Dinan 19 well areas in the northeast of the sag on plane. The organic matter type is mainly type Ⅱ2-Ⅲ，with a few type Ⅱ1，and it is the best in the second member of Pingdiquan Formation in the vertical direction. The organic matter type of source rocks near the central sag is mainly type Ⅱ1-Ⅱ2 on plane.（3）The simulation results of thermal evolution history show that the source rocks in the sag and slope areas reached their hydrocarbon generation peaks in the Late Triassic and Late Jurassic，respectively，and are currently in the high mature stage and mature stage，respectively.（4）There are two types of hydrocarbon accumulation models in the study area： “lowergeneration and upper-reservoir” and “self-generation and self-reservoir” . The source rocks of Pingdiquan Formation and the reservoirs of the Upper Urho Formation form “lower-generation and upper-reservoir” reservoirs， while the high-quality source rocks of the first and second members of Dingdiquan Formation and the small-scale fan delta deposits at the edge of the lake basin form “self-generation and self-reservoir” reservoirs within the Pingdiquan Formation，both of which have great potential for oil and gas exploration.

Key words: source rock, high organic matter abundance, hydrocarbon generation potential, thermal evolution simulation, lower-generation and upper-reservoir, self-generation and self-reservoir, Pingdiquan Formation, Permian, Dongdaohaizi Sag, Junggar Basin

CLC Number: 

  • TE122.1
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