尼日尔Termit盆地Yogou组泥岩地球化学特征及沉积背景

doi:10.11743/ogg20170319

Abstract

Abstract: Yogou Formation mudstone is one of the main hydrocarbon source rocks in the Termit Basin.In order to reveal the sediment source provenance attribute,tectonic setting and sedimentary environment of the Yogou Formation,geochemical elements of mudstones in the Yogou Formation were comprehensively analyzed,based on experimental data of the major elements,trace elements and rare earth elements of the 20 samples from 4 wells.The results show that the provenances of the upper Yogou Formation are derived from a passive margin source,while the provenances of the lower Yogou Formation are derived from a felsic source.The tectonic setting of the Yogou Formation provenance is similar to continental island arc.Water body during the deposition middle-upper Yogou Formation appears to have relatively lower salinity,in a marine-continental transition environment.The water body during the deposition of lower Yogou Formation appears to have relatively higher salinity,marine environment.According to CIA index and Sr/Cu ratio,the climate was warm-wet and water body was in the anaerobic environment based on the ratio of V/(V+Ni)during the Yogou Formation period.

Key words: provenance, geochemistry, sedimentary environment, Yogou Formation, Termit Basin

CLC Number:

TE122.1

Tang Wangxin, Jiang Zaixing, Liu Ruohan, Wang Xuying. Geochemical characteristics and deposition environment of the Yogou Formation mudstone in the Termit Basin，Niger[J]. Oil & Gas Geology, 2017, 38(3): 592-601,632.

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Geochemical characteristics and deposition environment of the Yogou Formation mudstone in the Termit Basin，Niger

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