Lithologic Reservoirs ›› 2024, Vol. 36 ›› Issue (3): 146-157.doi: 10.12108/yxyqc.20240314

• PETROLEUM EXPLORATION • Previous Articles    

Characteristics of deep source rocks and hydrocarbon accumulation model of Paleogene Shahejie Form ationin Qingshui subsag，Liaohe Depression

ZHU Kangle1,2,3, GAO Gang1,2, YANG Guangda4, ZHANG Dongwei4, ZHANG Lili5, ZHU Yixiu1,2, LI Jing6   

  1. 1. College of Geosciences, China University of Petroleum(Beijing), Beijing 102249, China;
    2. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum(Beijing), Beijing 102249, China;
    3. No. 7 Oil Production Plant, PetroChina Changqing Oilfield Company, Xi'an 710018, China;
    4. Research Institute of Exploration and Development, PetroChina Liaohe Oilfield Company, Panjin 124010, Liaoning, China;
    5. No. 8 Oil Production Plant, PetroChina Changqing Oilfield Company, Yulin 718600, Shaanxi, China;
    6. Research Institute of Exploration and Development, PetroChina Yumen Oilfield Company, Jiuquan 735000, Gansu, China
  • Received:2022-08-24 Revised:2022-10-03 Published:2024-04-30

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Abstract: Based on the analysis of organic carbon, rock pyrolysis, chloroform bitumen“A”, saturated hydro‐carbon chromatography-mass spectrometry and fluid inclusions, the characteristics of deep source rocks and hydrocarbon accumulation model of Paleogene Shahejie Formation in Qingshui subsag of Liaohe Depression were analyzed. The results show that:（1）The deep source rocks of Paleogene Shahejie Formation in Qingshui subsag are mainly developed in E2s32 submember, E2s33 submember and E2s4 member, mudstone of sublayerⅡ of E2s32 submember is most developed, mainly dark gray thick mudstone, with an overall thickness of about 170 m.（2）The average TOC content of the deep source rocks in the study area can reach 1.60%, and the average hydrocarbon generation potential is 2.82 mg/g. The organic matters are mainly type Ⅱ1-Ⅲ, mainly contributed by the mixing of phytoplankton and higher plants, and are in a weakly oxidizing-weakly reducing lacustrine saline water sedimentary environment. With Ro value ranging from 0.5% to 1.5%, the source rocks have generally reached the stage of massive hydrocarbon generation, and some have reached the stage of highly matured evolution.（3）The deep source rocks in the study area entered the oil-generating window at 38 Ma, and a large amount of natural gas began to be generated at 20 Ma. Fluid inclusions show that there are two stages of oil and gas charging in the study area, namely 38-26 Ma and 20 Ma to present, matching the evolution history of hydrocarbon generation.

Key words: geochemical characteristics of source rocks, biomarker, fluid inclusion, saltwater lake, accumulation model, Shahejie Formation, Paleogene, Qingshui subsag, Liaohe Dep

CLC Number: 

  • TE357.4
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