Xinjiang Petroleum Geology ›› 2021, Vol. 42 ›› Issue (3): 272-282.doi: 10.7657/XJPG20210303

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Petroleum Exploration History and Enlightenment in Tarim Basin

TIAN Jun()   

  1. Tarim Oilfield Company, PetroChina, Korla, Xinjiang 841000, China
  • Received:2020-11-20 Revised:2021-03-19 Online:2021-06-01 Published:2021-05-27

Abstract:

After summarizing the petroleum exploration history in the Tarim basin since 1950 from the points of major exploration areas and targets, exploration ideas, geological understandings and exploration technology and achievements, the exploration process for over 70 years in the basin can be divided into 4 stages: (1) Uphill exploration in the piedmont of the margin of the basin from 1950 to 1983; (2) Breakthrough to the cratonic area through conducting 6 times of exploration in the basin, and making many discoveries in cratonic clastic reservoirs from 1984 to 1996; (3) Great breakthrough in Kuqa piedmont area through persisting on “4 equal stresses” and strengthening technical research from 1997 to 2005; (4) Breakthroughs to subsalt thrust belts in the Kuqa foreland basin and to the fractured-vuggy carbonate rocks in ultra-deep exploration areas through focusing on three “battlefields” since 2006. As the first basin targeting ultra-deep exploration in China, it is necessary to summarize the hydrocarbon accumulation laws and exploration experiences. Due to low geothermal gradient and early-deposited effective source rocks, large-scale effective reservoirs may exist and accumulate in ultra-deep layers and large-scale hydrocarbon enrichment zones form. They are potential targets for future exploration, especially in the basin with low geothermal gradient in the central and western parts. The ultra-deep exploration practice in the Tarim basin has proved that persisting on technical research and innovation, conducting 3D seismic survey before drilling wildcat wells, and running integrated exploration and development are successful ways to make fast and large-scale exploration discoveries.

Key words: Tarim basin, exploration history, subsalt thrust belt, fractured-vuggy carbonate rock, ultra-deep oil and gas, exploration experience

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