Xinjiang Petroleum Geology ›› 1998, Vol. 19 ›› Issue (2): 95-100.

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HYDROCARBON GENERATION AND EVOLUTION IN TARIM AND JUNGGAR BASINS

Zhang Jinglian, Zhu Bingquan, Tu Xianglin, Zhang Pingzhong   

  1. Northwest Petroleum Geological Institute, CNPC, Lanzhou 730020
  • Received:1997-11-28 Online:1998-04-01 Published:2020-11-15
  • About author:Zhang Jinglian, Senior Engineer, Geochemistry

Abstract: Based on lead, strontium and neodymium isotopes data in kerogen and bitumen in Tarim and Junggar basins, this paper discussed four problems that have to be answered by petroleum geologists:① what to generate hydrocarbon, ② how to generate hydrocarbon, ③when did hydrocarbon generate, and ④when did hydrocarbon migrate, and pointed out that hydrocarbons in Tarim and Junggar basins generated in different tectonic background, hydrocarbon generation model, time and migration time were different, but their generation complied with inorganic synthetic reaction process proposed by Fisher and Tropsch.The author considers that controls of geochemical steep belt on distribution of oilfield are very obvious, hence geochemical steep belt(deep source crust-mantle interaction belt)should be regarded as target areas for finding large- and ultralarge-scale oil/gas fields.Northern, southwestern and northeastern areas in Tarim basin, as well as basement in Junggar basin should be favourable area for finding large-scale oil/gas fields.

Key words: Tarim basin, Junggar basin, Isotope, Hydrocarbon origin, Inorganic origin, Kerogen, Bitumen