羌塘盆地东部上三叠统巴贡组烃源岩特征及意义
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摘要
羌资7井钻遇的羌塘盆地东部巴贡组烃源岩是羌塘盆地迄今发现的优质烃源岩之一,也是首次获取来自地下深部的三叠系烃源岩。利用岩石热解、干酪根镜鉴和GC-Ms等分析方法,研究羌塘盆地东部巴贡组烃源岩的有机质丰度、类型、成熟度及有机质来源等。结果表明:研究区巴贡组烃源岩总有机碳质量分数为0.32%~1.29%,干酪根类型指数为-33.50~11.25,碳同位素为-28.4‰~-24.5‰,镜质体反射率为1.46%~1.90%,热解生烃温度为470~551℃,反映巴贡组是一套有机质质量分数较高、有机质类型为Ⅱ2-Ⅲ型的烃源岩,具有混合来源特征,有机质成熟度属于高成熟—过成熟,为生凝析油—湿气阶段的良好烃源岩。该结果对研究区烃源岩的下一步勘探具有指导意义。
Hydrocarbon source rock of the Bagong formation from the QZ7 well is one of the best sourcerocks,and has been the Triassic source rock obtained from deep underground since then.So it was studied in this paper.The analysis methods,such as rock pyrolysis,microscopic studies of the kerogen,and GC-Ms,were used to studied the organic matter abundances,organic matter types,organic matter maturity,etc.Results show that,about the hydrocarbon source rock of the Bagong formation in the study area,the TOC is between 0.32%～1.29%,kerogen TI values is between-33.50～11.25,theδ13 CPDB values is between-28.4‰～-24.5‰,Rois between 1.46%～1.90%,Tmaxvalues is between 470～551℃.All these reflect that the hydrocarbon source rocks of Bagong formation of is a set of good hydrocarbon source rocks with characteristics of good high organic matter content,Ⅱ2-Ⅲtype of organic matter,mixed source characteristic,high-to-over mature level,getting in the stage of condensate-moisture.It should be given more attention in the later exploration.
Hydrocarbon source rock of the Bagong formation from the QZ7 well is one of the best sourcerocks,and has been the Triassic source rock obtained from deep underground since then.So it was studied in this paper.The analysis methods,such as rock pyrolysis,microscopic studies of the kerogen,and GC-Ms,were used to studied the organic matter abundances,organic matter types,organic matter maturity,etc.Results show that,about the hydrocarbon source rock of the Bagong formation in the study area,the TOC is between 0.32%～1.29%,kerogen TI values is between-33.50～11.25,theδ13 CPDB values is between-28.4‰～-24.5‰,Rois between 1.46%～1.90%,Tmaxvalues is between 470～551℃.All these reflect that the hydrocarbon source rocks of Bagong formation of is a set of good hydrocarbon source rocks with characteristics of good high organic matter content,Ⅱ2-Ⅲtype of organic matter,mixed source characteristic,high-to-over mature level,getting in the stage of condensate-moisture.It should be given more attention in the later exploration.
引文
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