Lithologic Reservoirs ›› 2022, Vol. 34 ›› Issue (6): 1-18.doi: 10.12108/yxyqc.20220601

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

New progress and enlightenment of oil and gas exploration and geological understanding in Qaidam Basin

LI Guoxin1, SHI Yajun2, ZHANG Yongshu1, CHEN Yan1, ZHANG Guoqing1, LEI Tao1   

  1. 1. PetroChina Qinghai Oilfield Company, Dunhuang 736200, Gansu, China;
    2. PetroChina Research Institute of Petroleum Exploration & Development-Northwest, Lanzhou 730020, China
  • Received:2022-05-09 Revised:2022-05-12 Online:2022-11-01 Published:2022-11-09

Abstract: After the arduous struggle of several generations, the only oil and gas production base in Tibet Plateau has been built in Qaidam Basin, which has become a ballast for the economic and social development of GansuQinghai-Tibet region. By systematically summarizing the oil and gas exploration progress and exploration results in Qaidam Basin in recent years,the laws of basin formation, hydrocarbon generation, reservoir formation and reservoir accumulation were summarized, and the important fields and directions of exploration transformation in the future were pointed out. The research results show that:(1)Since the establishment of major science and technology projects in 2007,especially since the 12th Five-Year Plan, large oil and gas fields with 100 million ton reserves have been discovered by relying on scientific and technological innovation in Kunbei fault terrace, Yingxiongling structure,Altun Piedmont and Zahaquan Sag, meanwhile,original theories that are rare in other basins about hydrocarbon generation,reservoir formation and hydrocarbon accumulation mechanism were formed.(2)By systematically summarizing the exploration discovery and important geological cognition since the 12th Five-Year Plan,four major changes in future oil and gas exploration were proposed:from shallow to deepshallow combination, from structure to structure-lithology combination, from clastic rocks to multi-lithology combination,and from conventional to conventional and unconventional combination. Four major future fields were determined,including Paleogene-Neogene shale oil in western Qaidam Basin,Quaternary mudstone biogas of eastern Qaidam Basin,deep strata in northern margin of Qaidam Basin and Paleogene multi-lithology in western Qaidam Basin.(3)These research results will promote the transformation and deve-lopment of oil and gas exploration in Qaidam Basin and the development of oil and gas geology theory and technology in strongly reformed basins, and provide important support for the continuous exploration discovery of oil and gas reservoirs in various types of petroleum systems.

Key words: lithologic reservoir, lacustrine carbonate rocks, shale oil, biogas, Quaternary, Paleogene, Neogene, petroleum system, Qaidam Basin

CLC Number: 

  • TE121.1
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