地质通报2017，Vol.36Issue(4)：634-643,10.
南祁连盆地木里冻土区天然气水合物烃源岩特征及评价
Characterization and evaluation on the source rock of gas hydrate in Muli permafrost area, Nanqilian Basin
摘要
Abstract
China's first permafrost gas hydrate samples were collected by China Geological Survey in 2008 in Muli permafrost area,Nanqilian Basin.There exist different opinions concerning the genesis or origin of gases from gas hydrate.The organic geochemical indictors were systematically analyzed on the gas source rocks of the Middle Jurassic and the Upper Triassic from recently drilled 3 wells.The results show that the organic matter values are at high levels in source rocks of the Middle Jurassic strata (Jiangcang and Muh Formation) in the study area.78.9％ of TOC values are more than 1.0％,and 72.2％ of chloroform bitumen ‘A’ are more than 0.1％.The main organic matter is of type Ⅱ2 and Ⅱ 1.The vitrinite reflectances of most samples are between 0.7％ to 1.2％.The average value of total hydrocarbon generation potential is 8.8mg/g rock in total 71 samples.So the organic matters in most samples are at mature levels,or at condensate levels,which are good and very good source rocks for the gases of gas hydrates.The organic matter values are also at high levels in source rocks of the Upper Triassic strata (Galedesi Formation).76.9％ of TOC values are more than 1.0％.The chloroform bitumen'A'is less than 0.05％.The main organic matters are of type Ⅲ and Ⅱ 1.The vitrinite reflectances of most samples are between 1.1％ and 1.77％.Hence the organic matters in most samples are at post mature levels,or at dry gas levels,but the average value of total hydrocarbon generation potential is only 0.35 mg/g rock in total 39 samples,suggesting poor source rocks or barren rocks for the gases of gas hydrates.关键词
天然气水合物/中侏罗统/上三叠统/烃源岩特征/木里冻土区/南祁连盆地Key words
gas hydrate/Middle Jurassic/Upper Triassic/source rock characteristics/Muli permafrost/Nanqilian Basin分类
天文与地球科学引用本文复制引用
张家政,祝有海,黄霞,王明君,赵广珍,王平康,张帅,庞守吉..南祁连盆地木里冻土区天然气水合物烃源岩特征及评价[J].地质通报,2017,36(4):634-643,10.基金项目
中国地质调查局项目《陆域天然气水合物资源潜力评价》(编号:DD20160226)、《青南藏北冻土区天然气水合物调查》(编号:DD20160222)、《南祁连盆地油气资源战略调查》(编号:1211302108021-2) （编号:DD20160226）
