摘要
柴达木盆地北缘地区的中-下侏罗统是主要的油气源岩,而其中的大煤沟组七段是优质油气源岩。为了进一步评价柴达木盆地北缘东段侏罗系生烃能力,系统采集了大煤沟剖面中-下侏罗统大煤沟组的泥岩、油页岩、碳质泥岩、煤岩等样品,并进行了系统的常规的有机地球化学分析(有机碳,S1+S2,IH,沥青A,总烃,H/C与O/C值,干酪根,碳同位素组成δ13C,生物标志化合物规则甾烷的组成等)。结果表明,大煤沟组一段与七段一样,是优质油气源岩,这是柴达木盆地北缘地区的新发现。大煤沟组孢粉的显微沉积有机质组成及有机质类型的研究也证实了上述结论。在对盆地中-下侏罗统进行油气资源评价及勘探部署时,对大煤沟组一段的优质油气源岩应给予足够的重视。
It is generally thought that the lower-middle Jurassic is the major source rock in the northern Qaidam Basin,of which the seventh member of the Dameigou Formation is a high-quality source rock.Aiming at further evaluating the hydrocarbon-generative potential of the lower-middle Jurassic in the east part of the northern Qaidam Basin,the present study systematically sampled mudstones,oil shales,black mudstones and coals from the lower-middle Jurassic Dameigou Formation and performed conventional geochemical analyses,including organic carbon,S1＋S2,IH,bitumen A,total hydrocarbon,the ratio of H/C and O/C,carbon isotopic composition of kerogen（δ13C）,composition of regular steranes and etc..The results showed that the hydrocarbon-generative potential of the first member of the Dameigou Formation was as good as that of the seventh member,which was the first positive recognition on source rocks of the first member of the Dameigou Formation in the northern Qaidam Basin.This recognition was also supported by the palynofacies and kerogen type investigations of the Dameigou Formation.Therefore,it is suggested that the first member of the Dameigou Formation should deserve more attentions in the evaluation and exploration of the lower-middle Jurassic in the east part of the northern Qaidam Basin.
出处
《石油学报》
EI
CAS
CSCD
北大核心
2011年第1期49-53,共5页
Acta Petrolei Sinica
基金
中国石油天然气股份有限公司"柴达木盆地油气勘探开发关键技术研究"项目(07-01Z-01-04)资助
关键词
优质油气源岩
有机地球化学
大煤沟组
中-下侏罗统
柴达木盆地北缘东段
high-quality source rock
organic geochemistry
Dameigou Formation
lower-middle Jurassic
east part of the northern Qaidam Basin
