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中文摘要：
目前,对麻江古油藏源岩的认识仍存在很大分歧。对研究区沥青与原油进行了岩石热解（Rock-Eval）、饱和烃色谱分析,并测定了正构烷烃单体碳同位素组成。结果显示,麻江、丹寨地区下奥陶统O1h＋d的沥青成熟度明显高于凯里地区志留系翁项群（S2W）,原油;麻江、丹寨地区O1d＋h沥青的Pr/Ph峰面积比值〉1,而凯里地区S2W原油的Pr/Ph峰面积比值〈1;麻江、丹寨地区O1d＋h沥青的正构烷烃单体碳同位素组成偏重（〉-32.5‰）,曲线形态为波浪形,与下寒武统牛蹄塘组（∈1n）烃源岩干酪根的同位素组成具有可比性。而凯里地区S2W原油的碳同位素组成偏轻,曲线分布近于水平,来源于翁项群第二段的泥页岩。
英文摘要：
At present,there still remain disputes about the source rock of Majiang paleo-reservoir.The bitumen and oil seepage in the working area are analyzed by Rock-Eval and saturated hydrocarbon chromatography,and the free carbon isotopic composition in n-alkane of them are determined.The results show that the maturity of bitumen in O1d＋h Formation in Majiang and Danzhai is higher than that of oil seepage in S2W formation in Kaili.The Pr/Ph ratio of bitumen is 1,but that of oil seepage is 1.The free carbon isotopic composition in n-alkane of bitumen in Majiang and Danzhai are heavier（-32.5‰）,and its curve shapes are wavelike.The free carbon isotopic composition are comparable of those of kerogen in the lower Cambrian source rock.But those of S2W oil seepage in Kaili are lighter,and their curve shapes tend to be horizontal,and the oil seepage sources from the shale in the second section of Wangxiang Formation.
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