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地质科学  2009, Vol. 44 Issue (1): 268-280    DOI:
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西藏羌塘盆地北部托纳木地区上侏罗统雪山组沉积相
金玮, 代飞, 任志高, 谭宝德
大庆油田有限责任公司勘探开发研究院, 黑龙江, 大庆, 163712
Sedimentary facies of the Upper Jurassic Xueshan Formation in Tuonamu region of the Northern Qiangtang Depression,Xizang
Jin Wei, Dai Fei, Ren Zhigao, Tan Baode
Exploration and Development Research Institute of Daqing Oilfield Company Ltd., Daqing, Heilongjiang 163712
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摘要 羌塘盆地地处藏北高原,其南、北边界分别为班公错一怒江缝合带与拉竹龙一金沙江缝合带,盆地面积约18×104km2,可进一步分为羌北坳陷、中央隆起带和羌南坳陷3个二级构造单元.双湖托纳木地区地处羌北坳陷南部,与中央隆起带毗连,广泛发育上侏罗统雪山组沉积,垂向上由3个沉积旋回组合构成,总体显示为一个向上变粗的充填序列.雪山组发育扇三角洲相和冲积扇相,其中雪山组一段为前扇三角洲亚相沉积;二段为扇三角洲前缘亚相和扇三角洲平原亚相沉积,扇三角洲前缘亚相分为水下分流河道、河口坝和远砂坝沉积,扇三角洲平原亚相发育天然堤和分流河道沉积;三段为冲积扇相沉积,包括扇端和扇中沉积.雪山组沉积的物源来自西南部的中央隆起带.
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关键词扇三角洲相   冲积扇相   岩石类型   上侏罗统雪山组   羌塘盆地北部     
Abstract: The Qiangtang Basin is situated in northern part of the Qinghai-Xizang(Tibet)plateau, with the north and south boundaries being the Lazhulong-Jinshajiang and the BangongcuoNujiang suture belts respectively,and the square of the basin being about 18×10 km2.The Qiangtang Basin could be further divided into the Northern Qiangtang Depression,the Central Rise and the Southern Qiangtang Depression.The studied area,Tuonamu region in Shuanghu, was in southern part of the Northern Qiangtang Depression,near the Central Rise.The Upper Jurassic Xueshan Formation was widespreadly developed there.Vertically,the formation was composed of three sedimentary cycles,and displayed a succession that the grain-size became coaser upwards.The deposits with sedimentary facies of fan delta and alluvial fan were developed in the Xueshan Formation.The first member of the formation was sediments with pro-fan delta subfacies,the second member of the formation was sediments with subfacies of fan delta front and fan delta plain.The subfacies of fan delta front could be further divided into the microfacies of subaqueous distributary channel, distributary mouth bar and distal bar, and the subfacies of fan delta plain could be divided into the microfacies of natural levee and distributary channel.The third member of the formation was sediments with facies of alluvial fan,including the subfacies of outside fan and middle fan.The provenance of the Xueshan Formation was to the south,namely,the sources came from the Central Rise.
Key wordsFan delta facies   Alluvial fan facies   Rock types   The Upper Jurassic Xueshan Formation   The Northern Qiangtang Depression   
收稿日期: 2007-11-06;
基金资助:

中国地质调查局承担的国家财政部专项计划"青藏高原油气资源战略选区调查与评价"科技工程项目的部分成果.

作者简介: 金玮,男,1976年7月生,博士,上程师.石油地质学专业.e-mail:jinweigeo@petrochina.com.cn
引用本文:   
. 2009, 西藏羌塘盆地北部托纳木地区上侏罗统雪山组沉积相. 地质科学, 44(1): 268-280.
. Sedimentary facies of the Upper Jurassic Xueshan Formation in Tuonamu region of the Northern Qiangtang Depression,Xizang[J]. Chinese Journal of Geology, 2009, 44(1): 268-280.
 
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[2] 李文厚, 周立发. 苏红图—银根盆地白垩纪沉积相与构造环境[J]. 地质科学, 1997, (3): 387-396.
 
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