Oil & Gas Geology ›› 2004, Vol. 25 ›› Issue (3): 268-273,293.doi: 10.11743/ogg20040306

Previous Articles     Next Articles

Thermal evolution history and hydrocarbon generation in superimposed basin:taking the southern structural zone in Turpan-Hami basin, Xinjiang, as an example

Feng Qiao1,2, Liu Yiqun2, Zhang Xiaoli2, Zhou Lifa2, Hao Jianrong2   

  1. 1. Institute of Geosciences, Shandong University of Science & Technology, Qingdao, Shandong;
    2. Department of Geology, Northwest University, Xi'an, Shaanxi
  • Received:2004-03-08 Online:2004-06-25 Published:2012-01-16

Abstract:

Several sets of source rocks have developed and experienced multistage thermal evolution in Turpan-Hami basin, a superimposed basin, as a result of long-term basin evolution and multiphase tectonic activity, thus hydrocarbon-generating history is very complicated. Study of the basin's southern structural belt indicates that this area has experienced multiphase tectonic movements and modifications since Late Paleozoic. Structural thermal system and thermal evolution can be divided into five stages, including an extensional rift stage with rapid burial and super-high temperature gradient from Carboniferous to Early Permian; a post-rift depression stage with relatively rapid burial and high temperature gradient during Middle Permian; an intracratonic depression stage with steady subsidence and relatively high temperature gradient from Late Permian to Triassic; a broad sedimentation stage with steady subsidence and relatively low temperature gradient from Jurassic to Cretaceous; and a compressional orogenic stage with relatively quick subsidence and low temperature gradient during Cenozoic. Source rocks in various horizons and regions have different organic maturation and evolutional history. Both source rocks in Permian Lucaogou Formation in Tainan depression and Middle-Upper Triassic Xiaoquangou Formation in Tuokexun depression have experienced two hydrocarbon-generating processes. The reservoir types and hydrocarbon properties in Tainan depression are obviously different from those in Tuokexun depression, due to differences in burial history and hydrocarbon-generating history.

Key words: superimposed basin, thermal evolution, hydrocarbon generation, secondary oil generation

CLC Number: