Oil & Gas Geology ›› 2005, Vol. 26 ›› Issue (4): 411-421.doi: 10.11743/ogg20050403

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Study on relation between inorganic parameters in marine deposits and developmental environment of hydrocarbon source rocks:taking Ordos basin as an example

Tenger1,2, Liu Wenhui3, Xu Yongchang4, Chen Jianfa5, Hu Kai1, Gao Changlin2   

  1. 1. Department of Earth Sciences, Nanjing University, Nanjing, Jiangsu;
    2. Wuxi Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu;
    3. Exploration & Production Research Institute, SINOPEC, Beijing;
    4. Lanzhou Institute of Geology, Chinese Academy of Sciences, Lanzhou, Gansu;
    5. China Petroleum University, Beijing
  • Received:2005-07-10 Online:2005-08-25 Published:2012-01-16

Abstract:

The paleoenvironment of Ordovician in southwestern Ordos basin are discussed by using both inorganic and organic parameters,trying to identify potential hydrocarbon source rocks.In the strata with TOC>0.2%,V/(V+Ni)>0.50,Zr/Rb<2,Rb/K>30×104,Z>122,Zn,Mo and Ba are enriched,and the δ18O and δ13Ccarb have positive excursion.These characteristics indicate a stagnant and anoxic sedimentary environment with higher organic matter productivity and better preservation condition.These strata have δ13Corg<-28‰(iv- type kerogen),and high hydrocarbon-generating potential,so they can be regarded as potential hydrocarbon source rocks.The strata with TOC≤0.2% whose inorganic and organic parameters show a high energy,oxic,littoral-neritic environment with δ13Corg between-24% and-28‰(( type kerogen)have low hydrocarbon-generating potential.Such environment is unfavorable for preservation of organic matters,and development of hydrocarbon source rocks.The integration of inorganic parameters(trace element,stable isotope composition etc.) with general organic data can be regarded as important environmental factors for identifying development of effective marine hydrocarbon source rocks.

Key words: development environment, identification index, marine hydrocarbon source rock, inorganic parameter, Ordos basin

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