南祁连盆地木里冻土区天然气水合物烃源岩特征及评价

发布时间：2018-07-07 22:35

  本文选题：天然气水合物 + 中侏罗统　； 参考：《地质通报》2017年04期

【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。
[Abstract]:In 2008, China Geological Survey collected the first sample of natural gas hydrate in Muli permafrost region of South Qilian Basin. The organic geochemical characteristics of the source rocks of the Middle Jurassic and Upper Triassic are analyzed by using the analytical results of the samples from three new wells. The results show that in the middle Jurassic Jiangchang formation and Muli formation, the organic matter abundance of source rocks in coal measures is higher than 1% (total organic carbon content) is 78.9%, the chloroform asphalt "A" content is more than 0.1% and 72.2% of the total amount, and the main organic matter types are type 鈪，

本文编号：2106498