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通过对羌塘盆地北羌塘坳陷龙尾湖地区羌资1井烃源岩和地表烃源岩特征进行对比分析,从烃源岩岩性、有机质丰度、有机质类型和有机质成熟度等方面揭示了两者之间的差异,对龙尾湖地区布曲组烃源岩进行了评价。研究结果显示,羌资1井烃源岩的有机碳含量为0.1%～0.95%,其平均值明显高于地表烃源岩的有机碳含量,总体为中等—好烃源岩。该区有机质类型以Ⅱ1—Ⅱ2型干酪根为主,形成环境主要为还原环境,主要来源于低等水生生物,有机质类型较好。有机质成熟度普遍处于高成熟阶段,但羌资1井有机质演化程度明显比地表样品低。
By comparing and analyzing the characteristics of source rock and surface source rock of Qiangzi-1 well in the Longtouhu area, northern Qiangtang depression of Qiangtang Basin, from the aspects of lithology, organic matter abundance, organic matter type and organic matter maturity of source rock The difference between the two is revealed, and the source rocks of the Buqu Formation in the Longwei Lake area are evaluated. The results show that the organic carbon content of source rocks in Qiangzi-1 well is 0.1% ~ 0.95%, the average value of which is obviously higher than that of surface source rocks, which is generally medium-good source rock. The organic matter types in this area are mainly Type II1-Ⅱ2 kerogens, forming the environment mainly for reducing environment, mainly from lower aquatic organisms, with better organic matter types. The maturity of organic matter is generally at a high maturity stage, but the evolution of organic matter in Qiangzi-1 well is obviously lower than that of the surface sample.