Oil & Gas Geology ›› 2006, Vol. 27 ›› Issue (2): 187-193.doi: 10.11743/ogg20060208

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Relationship between thermal history and various energy mineral deposits in Dongsheng area,Yimeng uplift

Ren Zhanli1,2, Zhang Sheng2, Gao Shengli2, Cui Junping2, Liu Xinshe2   

  1. 1. Key Laboratory of Continental Dynamics, Ministry of Education, Northwest University, Xi'an, Shaanxi, 710069;
    2. Northwest University, Xi'an, Shaanxi, 710069
  • Received:2005-12-30 Online:2006-04-25 Published:2012-01-16

Abstract:

Geothermal gradient was low in Paleozoic and Early Mesozoic in Dongsheng area,Yimeng uplift,resulting in a low level of thermal evolution of source rocks,and it increased up to 3.3℃/100m in Late Mesozoic.The Late Mesozoic tectonic thermal events and the later continuous uplifting in Dongsheng area would have resulted in the active movement of thermal fluid.As a result,the coalification of Permo-Carboniferous,Triassic and Jurassic in the study area mainly occurred during Middle Jurassic to Early Cretaceous.Gas was mainly ge-(nerated) from the Paleozoic coal measure strata in Early Cretaceous,and the humic gas have mainly migrated and dissipated since Early Cretaceous,which is also the main mineralization period of the sandstone uranium impregnations in the area.Based on analyses of tectonic evolution and hydrocarbon generation history in the study area by using vitrinite reflectance and apatite fission track data,the hydrocarbons acting as the reducing agents for enrichment of uranium can only be sourced from the Permo-Carboniferous coal measure strata in the area with relatively high maturity to the south of Yimeng uplift,because the Permo-Carboniferous and Jurassic coal measure strata in the study area are still in immature to low mature evolutionary stages.

Key words: apatite fission track, palaeogeotherm, thermal evolution history, uranium ore, reservoiring stage, Yimeng uplift, Ordos basin

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