西藏措勤盆地色林错凹陷郎山组分子地球化学特征

措勤盆地是青藏高原内第二大海相含油气盆地，郎山组碳酸盐岩是盆地内重要的烃源岩。盆地东部的色林错凹陷保存条件好，前人还很少在该区开展石油地质研究。应用GC和GC—MS技术，对该凹陷内雄梅地区郎山组烃源岩抽提物进行了生物标志物的研究。研究表明，该区郎山组有机质母质主要为海相藻类，也有少量高等植物的混入；主要形成于缺氧，盐度较高的咸水环境，有机质成熟度较高，经历了1~2级的生物降解作用。因此，结合其它有机地球化学参数、沉积和构造条件，考虑到风化作用因素，郎山组烃源岩应具有较好的生油潜力，这对该区油气勘探具有重要意义。

Molecular Organic Geochemistry of Langshan Formation in Selincuo Sag,Coqen Basin,Central Tibet,China

Coqen Basin is the second largest marine basin in Tibet Plateau.Carbonate rocks of the Lower Cretaceous Langshan Formation is one of the most important hydrocarbon source rocks.Although having good conditions for petroleum preservation,Selincuo Sag has been got little petroleum study so far.A comprehensive study on biomarker of the extracts of sediments from the Langshan Formation at Xiongmei area by GC and GC-MS,indicated that marine algae was main contribution to formation of its organic matters together ...