Characteristics of Element Geochemistry and Paleo Sedimentary Environment Evolution of Zhangjiatan Shale in the Southeast of Ordos Basin and Its Geological Significance for Oil and Gas
Received date: 2014-12-28
Revised date: 2015-02-04
Online published: 2015-07-10
Shale thickness,total organic carbon content,brittle mineral content and physical property are key parameter of shale reservoir evaluation,which are obviously controlled by the sedimentary environment.Therefore,it′s significant to study the sedimentary environment and the evolution of the shale formation about gas reservoir evaluation and desserts prediction.This paper systematically tested more than 40 element concentrations of 525 groups of samples in Zhangjiatan shale drilled by well Y1 in the South-Central Ordos Basin.Then we analyzed the evolution of the paleoclimate,the paleobathymetry,the paleosalinity,the paleoproductivity and the oxidation-reduction states of sedimentary environment.The results showed that there are significant periodical changes of the element concentrations and ratios of Zhangjiatan shale from bottom to top,indicating that Zhangjiatan shale was deposited in a warm and humid,freshwater-brackish,hypoxia sedimentary environment,between which,the ④ unit was deposited in a wet sedimentary environment,when the water was deepest and highest reducing with high paleoproductivity.
ZHENG Yi-ding,LEI Yu-hong,ZHANG Li-qiang,WANG Xiang-zeng,ZHANG Li-xia,JIANG Cheng-fu,CHENG Ming,YU Yu-xi,TIAN Fei,SUN Bing-hua . Characteristics of Element Geochemistry and Paleo Sedimentary Environment Evolution of Zhangjiatan Shale in the Southeast of Ordos Basin and Its Geological Significance for Oil and Gas[J]. Natural Gas Geoscience, 2015 , 26(7) : 1395 -1404 . DOI: 10.11764/j.issn.1672-1926.2015.07.1395
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