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南祁连盆地木里冻土区天然气水合物烃源岩特征及评价 被引量:14

Characterization and evaluation on the source rock of gas hydrate in Muli permafrost area,Nanqilian Basin
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摘要 中国地质调查局2008年在南祁连盆地木里冻土区采集到了中国陆域第一例天然气水合物实物样品,对于天然气水合物的气体来源存在不同的认识。利用新完钻3口井样品的化验分析结果,分析了中侏罗统和上三叠统烃源岩有机地球化学特征。结果表明,中侏罗统江仓组、木里组煤系地层烃源岩有机质丰度较高,TOC(总有机碳含量)大于1%的样品占78.9%;氯仿沥青"A"含量大于0.1%的占总数的72.2%;有机质类型以Ⅱ_2、Ⅱ_1型为主;镜质体反射率R_o多介于0.7%~1.2%之间;71个样品生烃潜量平均值为8.8mg/g,总体处于生烃高峰期的生油阶段或凝析油阶段,属于好、很好烃源岩,为天然气水合物主力生烃层系。上三叠统尕勒得寺组亦为煤系地层烃源岩,TOC含量大于1%的样品占76.9%;氯仿沥青"A"含量小于0.05%;有机质类型以Ⅲ、Ⅱ_1型为主;镜质体反射率Ro介于1.1%~1.77%之间;总体处于生湿气或干气阶段,但由于构造抬升影响其生烃潜量,平均值仅为0.35mg/g,当前整体生烃能力较差,为非烃源岩或较差烃源岩,对天然气水合物成藏贡献不大。 China’s first permafrost gas hydrate samples were collected by China Geological Survey in2008in Muli permafrost area,Nanqilian Basin.There exist different opinions concerning the genesis or origin of gases from gas hydrate.The organic geochemical idictors were systematically analyzed on the gas source rocks of the Middle Jurassic and the Upper Triassic from recently drilled3wells.The results show that the organic matter values are at high levels in source rocks of the Middle Jurassic strata(Jiangcang and Muli Formation)in the study area.78.9%of TOC values are more than1.0%,and72.2%of chloroform bitumen‘A’are more than0.1%.The main organic matter is of typeⅡ2andⅡ1.The vitrinite reflectances of most samples are between0.7%to1.2%.The aver?age value of total hydrocarbon generation potential is8.8mg/g rock in total71samples.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 than1.0%.The chloroform bitumen‘A’is less than0.05%.The main organic matters are of typeⅢandⅡ1.The vitrinite reflectances of most samples are between1.1%and1.77%.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 only0.35mg/g rock in total39samples,suggesting poor source rocks or barren rocks for the gases of gas hydrates.
作者 张家政 祝有海 黄霞 王明君 赵广珍 王平康 张帅 庞守吉 ZHANG Jiazheng;ZHU Youhai;HUANG Xia;WANG Mingjun;ZHAO Guangzhen;WANG Pingkang;ZHANG Shuai;PANG Shouji(Oil and Gas Survey of China Geological Survey, Beijing 100029, China;United Energy (Beijing) Co., Ltd., Beijing 100016, China)
出处 《地质通报》 CAS CSCD 北大核心 2017年第4期634-643,共10页 Geological Bulletin of China
基金 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)
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 gas hydrate Middle Jurassic Upper Triassic source rock characteristics Muli permafrost Nanqilian Basin
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