Oil & Gas Geology ›› 2004, Vol. 25 ›› Issue (6): 629-633,685.doi: 10.11743/ogg20040606

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Preliminary study of relation between geochemical field of surface elements and energy minerals in Ordos basin

Pan Aifang1,2, He Ying1, Ma Runyong 3   

  1. 1. Department of Geology, Northwest University, Xi'an, Shaanxi;
    2. Xi'an University of Architecture and Technology, Xi'an, Shaanxi;
    3. Chang'an University, Xi'an, Shaanxi
  • Received:2004-11-22 Online:2004-12-25 Published:2012-01-16

Abstract:

Hydrocarbon alteration and adsorption can influence geochemical field of elements through enhancing dissolubility of fluids, changing redox conditions and pH values of media and impacting wettability of soil particles. The geochemical field of elements is closely related with the energy minerals in Ordos basin. The superposition zones of low background of iron group and chalcophile elements are the major lodging points of coal and natural gas. The transitional zones between low backgrounds of W Mo group elements and iron group and chalcophile elements are the favorable enriched zones of uranium deposits. The low background areas of W Mo group elements are the prospective enriched zones of hydrocarbons and coals. Large scale and high ranked low or high backgrounds of elements are generally correlated with large and rich deposits. The geochemical field of surface elements in Ordos basin and the surrounding areas can be divided into 4 zones, of which zoneⅠis enriched with oil, natural gas and coal, zoneⅡis the enriched zone of natural gas, coal and uranium, zone Ⅲ is the coexisting zone of oil and coal, and zone Ⅳ is the enriched zone of polymetralic and noble metallic ore and uranium deposits.

Key words: Ordos basin, geochemical field, geochemical zonation, energy minerals

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