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.