南盘江盆地主要烃源岩地球化学特征研究

通过对烃源岩发育的沉积环境研究认为,中下泥盆统盆地相沉积的黑色泥质岩类是南盘江盆地最主要的烃源岩,石炭系、二叠系和中下三叠统为次要烃源岩。6个浅井的120个样品表明,南盘江盆地中下泥盆统烃源岩有机碳含量为0.37%~3.63%,平均值为1.65%;为腐泥型有机质,热演化已经处于过成熟阶段。南盘江盆地中下泥盆统烃源岩的生标分布总体上反映了古生界海相烃源岩特征,但是由于其成熟度很高,使得低碳数的孕甾烷和三环萜烷系列含量很高,且总体生标特征具有很强的趋同性。 

GEOCHEMICAL CHARACTERISTICS OF MAIN SOURCE ROCKS IN THE NANPANJIANG BASIN

Based on the study of depositional environment,black argiloid of the Middle and Lower Devonian is the most important source rock,and the source rocks of Carboniferous,Permian and Middle and Lower Triassic are accessory in the Nanpanjiang Basin.120 samples from 6 shallow wells indicate that,source rocks of the Middle and Lower Devonian have a total carbon content varying from 0.37% to(3.63%) with an average of 1.65%.They are sapropelic and over-mature in thermal evolution.Biomar-kers of source rock reflect the marine source features of Paleozoic with higher content of lower carbon number compounds such as pregnanes and tricyclic terpanes in almost all samples because of the very high source maturation.