海相地层无机参数与烃源岩发育环境的相关研究——以鄂尔多斯盆地为例

doi:10.11743/ogg20050403

Abstract

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 δ¹³C_carb have positive excursion.These characteristics indicate a stagnant and anoxic sedimentary environment with higher organic matter productivity and better preservation condition.These strata have δ¹³C_org<-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 δ¹³C_org 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

CLC Number:

TE112.1

Tenger, Liu Wenhui, Xu Yongchang, Chen Jianfa, Hu Kai, Gao Changlin. Study on relation between inorganic parameters in marine deposits and developmental environment of hydrocarbon source rocks:taking Ordos basin as an example[J]. Oil & Gas Geology, 2005, 26(4): 411-421.

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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

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