【摘要】 为了更好地了解原油、沥青的成因,对克拉玛依油田沥青、塔里木盆地干酪根和沥青、辽河油田下第三系干酪根和沥青A以及原油进行了Pb、Sr、N d同位素研究,结果表明:准噶尔、塔里木和辽河3个盆地的沥青及原油的Pb同位素均显示出了壳-幔相互作用的特征,也均表现出不同于干酪根Pb同位素组成的特征(干酪根的Pb同位素组成明显表现出壳源的特征);克拉玛依沥青的Rb-Sr等时线年龄及初始Sr比值(87Sr/86Sr)I(即IO)与达尔布特断裂带附近金矿的成矿年龄和IO相一致,表明沥青与金矿的金均来自相同的深部源区。指出在准噶尔盆地通过深部地震测深所获得的中地壳低速层存在的信息支持了这样一个假说,油气可能为非生物(无机)成因。更多还原

【Abstract】 To better understand genesis of crude oil and bitumen,a comprehensive study of Pb,Sr,and Nd isotopic systematics was undertaken for kerogen,crude oil and bitumen from Karamay Oilfield,Tarim Basin and Liaohe Oilfield.Pb isotopic compositions of bitumen and crude oil from Karamay,Liaohe and Tarim all show features of crust-mantle interaction.They are evidently different from Pb isotopic composition of kerogen,which mostly show crustal signatures.Radiometric isotopic systems can be preserved in the bitumen and therefore allow us to date petroleum generation.Rb-Sr isochron age and initial(（）⁸⁷Sr/（）⁸⁶Sr) I ratio（I_O） of Karamay’s bitumen are correlated with the mineralization age and I0 of Au deposits near by Talabude Fault,which indicates that they were derived from the same deeper source.This hypothesis is supported by the low velocity existence（V_p=6.1 km/s） of mid-crust from the seismic profiling proglam of Junggur Basin.更多还原