Lithologic Reservoirs ›› 2023, Vol. 35 ›› Issue (2): 94-102.doi: 10.12108/yxyqc.20230209

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Hydrocarbon accumulation and evolution characteristics of Paleogene in Yingxiongling area, Qaidam Basin

WANYAN Ze1, LONG Guohui2,3, YANG Wei4, CHAI Jingchao3, MA Xinmin4, TANG Li3, ZHAO Jian3, LI Haipeng3   

  1. 1. PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China;
    2. China University of Geosciences(Beijing), Beijing 100083, China;
    3. PetroChina Qinghai Oilfield Company, Dunhuang 736202, Dunhuang, China;
    4. PetroChina Research Institute of Petroleum Exploration and Development-Northwest(NWGI), Lanzhou 730020, China
  • Received:2022-05-26 Revised:2022-07-18 Online:2023-03-01 Published:2023-03-07

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Abstract: Through the study of structural evolution characteristics, combined with the analysis of hydrocarbon inclusions and fine dissection of typical oil and gas reservoirs, the formation and evolution process of oil and gas reservoirs in the upper member of Paleogene Xiaganchaigou Formation in Yingxiongling area of Qaidam Basin were analyzed. The results show that:(1) The upper member of Xiaganchaigou Formation in Yingxiongling area experienced a semi saline lake, saline lake and salt lake environment during the Paleogene period, and formed a large area of source-reservoir type oil and gas reservoir dominated by laminated calcite dolomite which is rich in organic matters.(2) The upper member of Xiaganchaigou Formation in the study area has experienced three stages of oil and gas filling. The hydrocarbon inclusions in the first stage are single liquid oil inclusions, reflecting the migration and filling of early low mature crude oil. The hydrocarbon inclusions in the second stage are single liquid oil inclusions, which reflects the migration and filling of medium mature crude oil. The hydrocarbon inclusions in the third stage are gas-liquid two-phase oil inclusions, reflecting an episode of filling of highly mature crude oil.(3) The oil and gas in the study area are characterized by three stages of accumulation. In the middle and late stages of the deposition of Shangganchaigou Formation, reservoirs with low saturation and low maturity formed in the upper member of Xiaganchaigou Formation. In the sedimentary period of Shangyoushashan Formation, low mature to mature oil and gas accumulated to the salt reservoirs and high permeable zones, forming a high oil and gas production area. During the sedimentation period of Shizigou Formation to Qigequan Formation, maturehighly mature oil migrated to the upper member of Ganchaigou Formation and above through the transport of double layer faults to form structural oil and gas reservoirs.

Key words: saline lake, laminated calcite dolomite, intercrystalline pore, high permeable zone, shale oil, low mature source rock, upper member of Xiaganchaigou Formation, Paleogene, Yingxiongling area, Qaidam Basin

CLC Number: 

  • TE122.1
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