青藏高原羌南盆地侏罗系曲色组烃源岩评价

青藏高原羌南盆地曲色组烃源岩的类型为黑色油页岩、深灰色泥页岩和深灰色泥灰岩,厚度为215.8m。根据对野外地表露头烃源岩的观察,结合室内分析数据,从有机质的丰度、有机质的类型、有机质的成熟度等3个方面对其进行了评价。曲色组烃源岩有机质丰度较高,黑色油页岩、灰色泥页岩和深灰色泥灰岩有机碳平均质量分数分别为9.23%、2.21%和4.33%,总体表现为好烃源岩特征。泥页岩有机质类型主要为Ⅱ型,油页岩与泥灰岩总体表现为Ⅱ型,少数为Ⅲ型。干酪根颜色、岩石热解峰温(Tmax)表明曲色组烃源岩有机质成熟度较高,处于成熟阶段。

Assessment of the source rocks from the Quse Formation in southern Qiangtang Basin on the Qinghai-Xizang Plateau

The source rocks from the Quse Formation in southern Qiangtang Basin on the Qinghai-Xizang Plateau consist of black oil shales,dark grey argillutites and dark grey marls,with a total thickness of about 215.8 m. The results of assessment of the source rocks indicate that the organic matter abundances are higher,including 9.23% for black oil shales,2.21% for dark grey argillutites and 4.33% for dark grey marls,respectively. The organic matter types are classified into the type II for the argillutites,and dominantly the type II and subordinately the type III for the oil shales and marls. The pale brown colour for the kerogens and higher Tmax values (430℃-470℃) for the collected samples suggest the source rocks from the Quse Formation have reached up to the mature stage.