羌塘盆地羌南坳陷查郎拉地区烃源岩基本特征

Characteristics of the Hydrocarbon Source Rock in the South Depression in Qingtang Basin

在野外遥感石油地质调查的基础上 ,首次对羌南坳陷查郎拉地区烃源岩的分布 ,有机质丰度、类型及热演化特征等进行了系统的研究 .区内上三叠统肖查卡组及中侏罗统布曲组发育有良好的烃源岩 ,其厚度大、丰度高 ,为油气的生成奠定了基础 .多处油气苗的发现 ,表明盆地内有过完整的油气生成与运移过程 .盆地虽经历了后期强烈的构造活动 ,但在相对变形较弱的地区仍存在有广阔的勘探前景 .

The types and distribution of hydrocarbon source rock, the abundance, types and thermal evolution of organic matter in Chalangla area of the depression were studied based on field remote sensing geologic mapping. There is hydrocarbon source rock in Upper Triassic Xiaochaka formation and Middle Jurassic Buqu formation, and it is of high abundance and great thickness.There are great gas resource potential in Xiaochaka formation and great oil resource potential in Buqu formation, the former is of high thermal evolution and the latter is of middle thermal evolution. Qiangtang Basin underwent serious deformations, which were favourable to the formation of traps, but harmful to the preservation of hydrocarbon. But there was still better condition for the preservation of hydrocarbon in relatively gentle deformation belts.