Paragenesis of the Upper Jurassic-Lower Cretaceous Sediments in the Priverhoyansky and Indigiro-Zyryansky Basins

International science and technology conference "Earth science"

Sivtsev, A.I.^1 ; Zueva, I.N.^1 ; Chalaya, O.N.^1

Laboratory of Caustobioliths Geochemistry, Institute of Oil and Gas Problems, Siberian Branch of the RAS, Oktyabrskaya St., 1, Yakutsk

677980, Russia^1

关键词: Common source;    Geochemical characteristic;    Jurassic;    Lower Cretaceous;    Oil and gas;    Post-collision;    Sedimentary basin;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/272/2/022122/pdf
DOI  :  10.1088/1755-1315/272/2/022122

来源: IOP

【 摘 要 】

The results of comparison geological-geochemical study of the Upper Jurassic-Lower Cretaceous sediments of the Preverkhoyansky and Indigiro-Zyryansky basins are considered from the positions of uniform sedimentary basin evolution. Based on lithologic-petrographic data the differences were established in the catagenetic transformations degree of the organic matter (OM) of the Upper Jurassic-Lower Cretaceous deposits from MC3 within the Preverkhoyansky basin and up to MC5 - in the Indigiro-Zyryansky. The distinctions are due, mainly, by a post-collision stage of development of the territory of the Indigiro-Zyryansky basin. The geochemical characteristic of organic matter is given. The identity of composition and distribution of hydrocarbons-biomarkers indicates a common source of the initial OM formed in the conditions of continental facies in the Preverkhoyansky basin. Contrary, OM accumulation of the Upper Jurassic deposits of the western part of the Indigiro-Zyryansky basin occurred in sea and lagoon facies. OM enriched by sapropel material that indicated more oil generation potential of rocks. Based on analysis of the received results the map of prospects of oil-and-gas bearing with allocation of sites for conducting prime exploration works on oil and gas is constructed for the Upper Jurassic-Lower Cretaceous deposits of the Preverkhoyansky and Indigiro-Zyryansky basins.