西藏措勤盆地色林错凹陷郎山组分子地球化学特征  

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

作　　者：王立成[1,2] 王成善[1,2] 李亚林[1,2] 魏玉帅[2,3] 朱利东[4] 曹珂[1,2] 

机构地区：[1]中国地质大学地球科学与资源学院,北京100083 [2]中国地质大学青藏高原地质研究中心,北京100083 [3]西藏自治区拉萨地调院,拉萨850000 [4]成都理工大学沉积地质研究院,成都610059

出　　处：《沉积学报》2009年第6期1199-1207,共9页Acta Sedimentologica Sinica

基　　金：财政部国家油气专项"青藏高原油气资源战略选区调查与评价"项目(编号:XQ2004-06)资助

摘　　要：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。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 petro- leum 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 with a few higher plants input. The organic matters were formed under anoxic environment having a little high salinity, and experienced high maturing and biodegradation ranked 1-2. Therefore, according to other organic geochemistry data, sedimentary and structural condition, carbonate rocks of the Langshan Formation have good source rocks potential considering weathering and should be of great impor-tance to petroleum exploration.

关 键 词：生物标志物 母质来源 成熟度 郎山组 措勤盆地 

分 类 号：P593[天文地球—地球化学]