The mechanism of remote sensing detecting the hydrocarbon microseepage is its geochemical abnormality.Referencing the geochemical models of hydrocarbon microseepage suggested by Schumacher（1996） and Saunders et al（1999）

this study implements ferrics index（TM3/TM1）

ferrous index（TM5/TM4） and clay index（TM5/TM7） to detect the abnormal areas of ferric-oxides

ferrous-oxides/organics

and clayzation/carbonation

respectively

in the east Yimeng Uplift of Ordos Basin.Integrated analysis the ferrous index

mineral composition

aeroradiometric data（U

Th and K）

and thorium-normalized uranium index（Ud）

two hydrocarbon microseepage belts in this area have been extracted.One is located in the northern Dongsheng which is along a nearly east-westward fault zone and Kubuqi desert.Its distribution is consistent with the ranger reported by the oil and gas investigation.The other one

named Pohaizi-Zhunzhao-Xinmiao zone

is located in the southern Dongsheng uranium mineralization zone and its northern boundary is along the northwestward Pohaizi-Zhunzhao fault.On the cross profiles of Pohaizi-Zhunzhao-Xinmiao zone

it is clear that the ferrous index（Fe2+）

aeroradiometric uranium（U）

and thorium-normalized uranium（Ud） are positive abnormality

and the ferric index（Fe3+）

aeroradiometric total channel（Tc） and potassium（K）

thorium-normalized potassium（Kd） are negative abnormality.The study suggests that the subaerial reduced areas are related to hydrocarbon microseepage and the hydrocarbon migration along the fault and fracture zone or penetrable strata played an important role for uranium mineralization in Zhiluo Formation near the northwestward fault zone.