【摘 要】
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For better understanding the hydrocarbon micro seepage-induced alteration to the ground surface soil,we studied the mineralogical and geochemical compositions of surface soil samples in two selected s
【机 构】
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SKLOG , Guangzhou Institute of Geochemistry, Chinese Academy of Sciences
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For better understanding the hydrocarbon micro seepage-induced alteration to the ground surface soil,we studied the mineralogical and geochemical compositions of surface soil samples in two selected sections along gas-bearing structures in East Sichuan area,China.The adsorbed hydrocarbons were analyzed using gas chromatography (GC),fluorescence and ultraviolet (UV) spectrometer.For probing the mechanism of remote sensing,the soil spectra are measured in the range of visible to near infrared (VI-NIR) bands.We found anomalies of soil mineral including clay minerals such as kaolinite,illite and chlorite,and chemical composition of surface soil such as increase of ferrous iron and decrease of ferric iron,as well as carbonate mineral are coincide in space with the anomalies of adsorbed hydrocarbons.These anomalies are found in the fault area at the edge of gas traps.These evidences suggest a close connection between microseepaged hydrocarbons and these anomalies of soil mineral,chemical as well as organic geochemical components.We also found the decrease of spectral reflectance in 400-600nm and 2200-2350 nm for the anomaly soils,which also reflect the increase of ferrous-iron content and the decrease of ferric-iron content,as well as increase of clay- and carbonate-mineral contents,respectively.
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