西藏尼玛盆地东部油气显示带的发现及其勘探意义  

Discovery of hydrocarbon display zone and its exploration significance in the eastern Nima basin,Tibet

作　　者：李英烈 伍新和 伊海生[3] 夏响华 汪锐[1,2] 曹洁 LI Yinglie;WU Xinhe;YI Haisheng;XIA Xianghua;WANG Rui;CAO Jie(Oil and Gas Survey,China Geological Survey,Beijing 100083,China;The Key Laboratory of Unconventional Petroleum Geology,CGS,Beijing 100029,China;Institute of Sedimentary Geology,Chengdu University of Technology,Chengdu 610059,Sichuan,China)

机构地区：[1]中国地质调查局油气资源调查中心,北京100083 [2]中国地质调查局非常规油气地质重点实验室,北京100029 [3]成都理工大学沉积地质研究院,四川成都610059

出　　处：《地质通报》2021年第5期745-752,共8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综合调查》(编号:DD20190102);《伦坡拉、尼玛与措勤盆地油气基础地质调查》(编号:DD20160160)。

摘　　要：野外地质调查过程中,在尼玛盆地东部字康勒-康嘎勒一带发现长约55 km的油气显示带,在1∶25万尼玛县地质图上标注为白垩系竟柱山组。通过剖面实测及样品地球化学特征分析,采集的24件样品泥页岩有机碳含量较高,平均TOC含量为1.32%,平均生烃潜量为7.38 mg/g,有12件样品TOC大于1%,成熟度也较适中,属好-极好生油岩级别。由此认为,尼玛盆地东部赛布错坳陷生油条件好于达则错坳陷,可作为下一步盆地重点工作区域。油气显示带的发现为尼玛盆地与伦坡拉盆地的地层对比提供了依据,也为盆地下一步的重点工作开辟了新的方向。In the field geological survey,an oil and gas belt about 55 km long was found in the Zikangle-Kanggale area in the eastern part of Nima Basin,which is hosted in the Cretaceous Jingzhushan Formation.Outcrop studies and geochemical analysis of 24 collected samples indicate that the organic carbon content is high,with an average TOC content of 1.32%and an average potential of generating hydrocarbon of 7.38 mg/g,12 samples of which have TOC higher than 1%,with moderate compositional maturity,suggesting to be good-very good source rock grade.It is concluded that the hydrocarbon generation conditions of the Saibucuo Depression in the eastern Nima basin are better than those of the Dazecuo Depression.Saibucuo Depression can be considered as the next key target for exploration in this basin.The discovery of this oil and gas belt can provide a basis for the stratigraphic correlation between the Nima basin and Lunpola basin,and open up a new direction for the hydrocarbon exploration.

关 键 词：西藏 油气显示 尼玛盆地 有机质丰度 

分 类 号：P618.13[天文地球—矿床学]