The Geochemical Characteristics and Significance of Aromatic Hydrocarbon of Eastern Xinjiang Area Crude Oils

Based on the research of saturated hydrocarbon biomarkers of crude oils in Eastern Xinjiang area(including the Turpan-Hami Basin and Santanghu Basin),a comprehensive analysis and geochemistry study were carried out on aromatic fractions of crude oils.Through analysis of the composition of aromatic hydrocarbon,types of crude oils were divided.The distribution of compounds(alkyl naphthalene,F,OF and SF',cadalene and retene)shows sedimentary environment of Carboniferous organic matter crude oils in Santanghu Basin were low water salinity,weak reduction,the oil-rich parent materials from terrestrial input,and sedimentary facies transition phase for the land and sea.Optimization of dimethyl phenanthrene,the top three phenanthrene indexes and thermal evolution of the two sterane isomerization indexs have good correlation and consistency,and can effectively indicate the high evolution stage.In addition,application of the two indicators to determine Santanghu Carboniferous Basin Karaoke Gang Unit,department of crude oil is the high maturity crude oil,and Haerjiawu group is overmature crude oil.