西藏伦坡拉盆地古近系页岩油资源潜力初探  

A Preliminary Study of the Paleogene Shale Oil Potential in Lunpola Basin,Tibet

作　　者：陈珊 刘博[2] 刘旭锋 刘治博[3] CHEN Shan;LIU Bo;LIU Xu-feng;LIU Zhi-bo(Oil& Gas Survey, China Geological Survey, Beijing 100083;China University of Geosciences (Beijing), Beijing 100083;Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037)

机构地区：[1]中国地质调查局油气资源调查中心,北京100083 [2]中国地质大学(北京),北京100083 [3]中国地质科学院矿产资源研究所,北京100037

出　　处：《地球学报》2017年第5期839-846,共8页Acta Geoscientica Sinica

基　　金：中国地质调查局二级项目(编号:DD20160026;DD20160202)资助~~

摘　　要：本文在西藏伦坡拉盆地蒋日阿错凹陷西北部古近系牛堡组和丁青湖组实测剖面的基础上,通过对烃源岩有机质丰度、有机质类型、有机质成熟度及生标化合物等进行分析,认为牛堡组和丁青湖组烃源岩有机质丰度中等,有机碳含量TOC在0.91%~5.53%之间,氯仿沥青"A"在0.03%~0.63%之间,有机质类型主要为Ⅰ型,Tmax平均值为428℃,烃源岩处于未成熟-低成熟阶段。综合分析认为,研究区牛堡组是古近系最有利的烃源岩层段,与国内外典型页岩层各项指标对比,牛堡组具备页岩油形成的基本地质条件,但成熟度略低,推断位于蒋日阿错凹陷沉积中心的牛堡组烃源岩厚度更大、成熟度更高,页岩油潜力更大。Based on the measured profile of the Paleogene Niubao Formation and Dingqinghu Formation innorthwestern Jiangriacuo sag,northwest Lunpola Basin,Tibet,the authors analyzed the organic matter abundance,types and maturity of the source rocks.The Niubao Formation and Dingqinghu Formation were characterized byhigh organic matter abundance with the TOC values ranging from0.91%to5.53%and the chloroform“A”ranging from0.03%to0.63%.The organic matter is of type I,with average Tmax being428℃,which suggests thatthe source rock is at the early stage of oil generation,and the Niubao Formation is better than the DingqinghuFormation in this aspect.The results indicate that the Niubao Formation in the work area is the most favorablesource rock.A comparison with typical shale layers in China and abroad shows that it possesses the basicgeological condition of generating shale oil although the maturity is slightly lower.It is inferred that the highermaturity the deposition center of Jiangriacuo sag is the greater the shale oil potential would be.

关 键 词：牛堡组 页岩油 伦坡拉 西藏 

分 类 号：P534.61[天文地球—古生物学与地层学] P618.12[天文地球—地质学]