Lithologic Reservoirs ›› 2024, Vol. 36 ›› Issue (6): 110-121.doi: 10.12108/yxyqc.20240611

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Geochemical characteristics of source rocks and evaluation of shale oil “sweet spot”of Permian Fengcheng Formation in Mahu Sag

BAI Yubin1,2, LI Mengyao3, ZHU Tao3, ZHAO Jingzhou1,2, REN Haijiao3, WU Weitao1,2, WU Heyuan1,   

  1. 1. School of Earth Sciences and Engineering, Xi'an Petroleum University, Xi'an 710065, China;
    2. Shaanxi Key Laboratory of Petroleum Accumulation Geology, Xi'an 710065, China;
    3. Research Institute of Exploration and Development, PetroChina Xinjiang Oilfield Company, Karamay 834000, Xinjiang, China
  • Received:2023-10-09 Revised:2024-01-05 Online:2024-11-01 Published:2024-11-04

Abstract: The source rock characteristics of the Permian Fengcheng Formation in Mahu Sag were defined based on a variety of petrographic and organic geochemical data,such as rock slices,total organic carbon(TOC), rock-eval pyrolysis,chloroform bitumen“A”and vitrinite reflectance(Ro). The evaluation standard of shale oil “sweet spot”was established,and the distribution characteristics of“sweet spot”in the study area were systematically described by taking typical wells as examples. The results show that:(1)The source rocks of Permian Fengcheng Formation in Mahu Sag are mainly composed of quartz,feldspar and dolomite,followed by calcite and clay minerals. The rock types include calcareous mudstone,sandy mudstone,dolomitic mudstone and mud stone.(2)The abundance of organic matter in source rocks with different lithologies is different,and TOC is 0.75% on average. The organic matter type is mainly type Ⅱ,which is the main source of oil generation,fol lowed by type Ⅰ and a small amount of type Ⅲ. It is in the low maturity to mature evolution stage,and dominated by medium to very high-quality source rocks.(3)TOC,chloroform bitumen“A”,free hydrocarbon S1 and Ro were selected as evluation parameters for shale oil“sweet spot”and divided into four resource types:enriched, medium enriched,low efficiency and ineffective.(4)The evaluation results of shale oil“sweet spot”in typical well Maye 1 show that the shale oil exploration potential is the best in the layers with high TOC,chloroform bitu men“A”,S1,and oil saturation index(OSI). In addition,shale oil also has exploration potential in the relatively organic-poor interval with high S1.

Key words: source rock, organic geochemistry, shale oil, “sweet spot”evaluation, organic matter type, organic matter abundance, organic matter maturity, Fengcheng Formation, Permian, Mahu Sag, Junggar Basin

CLC Number: 

  • TE122.1
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