【摘要】 海拉尔盆地巴彦呼舒凹陷舒1井原油密度达0.932g/cm3,但含蜡量仅为6%,属于低蜡稠油。原油中饱和烃含量仅30%左右,而非烃含量达30%以上;全油碳同位素组成很轻,δ13C值分布为-34‰～-31‰;原油中类异戊二烯烷烃丰富,且以植烷占明显优势,Pr/Ph值小于0.9;甾烷组成中以ααα 20R构型甾烷为主,αββ构型异胆甾烷低,没有重排甾烷;萜烷组成以五环萜烷为主,三环萜烷含量低;含有丰富的伽马蜡烷和β 胡萝卜烷。原油的各种地球化学参数表明其属于低成熟原油,其成烃母质属于沉积于咸水强还原环境的水生藻类有机质,是下白垩统南屯组烃源岩在低成熟阶段形成的产物。图4表1参8更多还原

【Abstract】 The crude oils in the Well Shu-1, Bayanhushu Sag, Hailaer Basin, can be defined as low-wax heavy oils with a density of 0.932 g/cm³, and wax content of 6%. The oils contain about 30% saturated hydrocarbons and over 30% resin. The carbon isotopic composition of the crude oils ranges from （-34‰） to （-31‰）. The oils are rich in isoprenoid and β-carotane hydrocarbons, showing a predominance of phytane to pristane with Pr/Ph<0.9. The steranes are characterized with high ααα-20R configuration steranes of C₂₇, C₂₈, C₂₉, low ααα-20S and αββ configuration steranes, and no diasteranes. The terpanes are dominated by pentacyclic terpanes with high concentration of gammacerane, and low content of tricyclic terpanes. The information indicates that the oils in Well Shu-1 are low maturity oil, and the organic matter generated the oils is dominated by alga which is deposited in highly reductive environment with salt or hyper-saline water. The crude oils are derived from low maturity of source rocks, the Cretaceous Nantun Formation.更多还原