准噶尔盆地陆西地区上石炭统上层序火山岩岩相研究
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摘要
采用地质、地震资料,对准噶尔盆地陆西地区上石炭统进行了层序划分与对比,并对上石炭统上层序火山岩岩性、岩相进行了分析。研究认为,陆西地区上石炭统可分为上、下2个层序,上层序的顶、底界均为区域性不整合面,在地震剖面上具有上超/削蚀的反射终端类型。上层序的岩石类型主要有玄武岩、安山岩、沉凝灰岩、凝灰岩、火山角砾岩、英安岩等。火山岩岩相有火山通道相、爆发相、溢流相和火山沉积相。火山通道相主要根据地震剖面上的锥状体来识别;爆发相岩性主要为火山角砾岩与凝灰岩,电性特征为高电阻率、高速度,伽玛值变化大,但以低伽玛为主,具有变振幅、断续或杂乱反射特征;溢流相岩性主要为玄武岩、安山岩、英安岩等,电性特征为高电阻率、高速度,伽玛值变化大,具有中—强振幅、较连续反射特征;火山沉积相主要由正常火山碎屑岩、正常沉积岩、火山碎屑沉积岩等组成,电性特征表现为高伽玛、低电阻率、低速度,具有强振幅、高连续反射特征。爆发相主要分布于达巴松凸起—夏盐凸起西部和东部;火山沉积相主要分布于夏盐凸起中部、玛湖凹陷南部;其他地区则为溢流相分布区。
By geologic information and seismic data,we carry out the sequence division and correlation for the upper Carboniferous stratigraphy in the Luxi area of Junggar basin,and discuss the lithology and lithofacies volcanic rock at the top of the upper Carboniferous stratigraphy.The result suggests that the upper Carboniferous stratigraphy in the Luxi area could be divided into two sequences,such as upper sequence and lower sequence.The top and base boundaries of the upper sequence are regional unconformity,which is shown as the onlap/erosion reflection terminal type in the seismic profile.The rock types in the upper sequence are basalt,andesite,sedimentary tuff,tuff,volcanic breccia,dacite,etc.The volcanic facies included volcanic conduit,explosive,overflow,volcanogenic sedimentation.The volcanic conduit facies can be distinguished by cone reflection in the seismic profile.The lithological rocks in the explosive rock facies are volcanic breccia and tuff,with high electrical resistivity and high velocity,various gamma values but low gamma value,accompanied with variable amplitudes,interrupted continuous reflection or scrambled reflection signature.The lithological rocks in the overflow facies are basalt,andesite and dacite,with high electrical resistivity and high velocity,various gamma value,accompanied with moderate-strong amplitudes,continuouse reflection signature.The lithological rocks in volcanogenic sedimentation facies are composed of normal volcaniclastic rock,sedimentary rock and volcaniclastic sedimentary rock,with electrical property of high gamma,low electrical resistivity and low velocity,as well as high amplitude,high continuouse reflection signature.The explosive rock facies is greatly distributed in the Dabasong uplift and the western and eastern parts of the Xiayan uplift.The volcanogenic sedimentation facies is mainly distributed in the central Xiayan uplift,southern Mahu sag.The other regions show the overflow facies.
By geologic information and seismic data,we carry out the sequence division and correlation for the upper Carboniferous stratigraphy in the Luxi area of Junggar basin,and discuss the lithology and lithofacies volcanic rock at the top of the upper Carboniferous stratigraphy.The result suggests that the upper Carboniferous stratigraphy in the Luxi area could be divided into two sequences,such as upper sequence and lower sequence.The top and base boundaries of the upper sequence are regional unconformity,which is shown as the onlap/erosion reflection terminal type in the seismic profile.The rock types in the upper sequence are basalt,andesite,sedimentary tuff,tuff,volcanic breccia,dacite,etc.The volcanic facies included volcanic conduit,explosive,overflow,volcanogenic sedimentation.The volcanic conduit facies can be distinguished by cone reflection in the seismic profile.The lithological rocks in the explosive rock facies are volcanic breccia and tuff,with high electrical resistivity and high velocity,various gamma values but low gamma value,accompanied with variable amplitudes,interrupted continuous reflection or scrambled reflection signature.The lithological rocks in the overflow facies are basalt,andesite and dacite,with high electrical resistivity and high velocity,various gamma value,accompanied with moderate-strong amplitudes,continuouse reflection signature.The lithological rocks in volcanogenic sedimentation facies are composed of normal volcaniclastic rock,sedimentary rock and volcaniclastic sedimentary rock,with electrical property of high gamma,low electrical resistivity and low velocity,as well as high amplitude,high continuouse reflection signature.The explosive rock facies is greatly distributed in the Dabasong uplift and the western and eastern parts of the Xiayan uplift.The volcanogenic sedimentation facies is mainly distributed in the central Xiayan uplift,southern Mahu sag.The other regions show the overflow facies.
引文
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[2]Yang Liying,Li Ruilei.Integrated recognition with geologic andseismic methods on the volcanic rocks,volcanic edifices and vol-canic facies in southern deep Songliao basin[J].Journal of JilinUniversity,2007,37(6):1083-1090.[杨立英,李瑞磊.松辽盆地南部深层火山岩、火山机构和火山岩相地质—地震综合识别[J].吉林大学学报,2007,37(6):1083-1090.]
[3]Jin Huijuan,Li Yuci,Li Juying.The flysch facies of middle carbon-iferous in the northern Tianshan,Xinjinag[J].Acta SedimentologicaSinica,1989,7(1):49-56.[晋慧娟,李育慈,李菊英.新疆北天山中石炭统的复理石相[J].沉积学报,1989,7(1):49-56.]
[4]Guan Shourui.Magmatic Rock and Metamorphic Rock Con-ciseness Course of Study[M].Beijing:Geological PublishingHouse,1989:1-68.[管守锐.岩浆岩及变质岩简明教程[M].北京:地质出版社,1989:1-68.]
[5]Qiu Jiaxiang,Tao Kuiyuan,Zhao Junlei,et al.Volcanic Rock[M].Beijing:Geological Publishing House,1996:10-55.[邱家骧,陶奎元,赵俊磊,等.火山岩[M].北京:地质出版社,1996:10-55.]
[6]Mu Zhonghai,Jiang Yuqiang.Seismic Stratigraphy Interpreta-tion Method and Apply[M].Chengdu:Electron ScientificTechnical University Press,1996:60-90.[牟中海,蒋裕强.地震地层学解释方法及应用[M].成都:电子科技大学出版社,1996:60-90.]
[7]Wu Jinghua,Huang Yun,Zhang Jiwu,et al.Seismic identifica-tion method apply of volcanic phase in Junggar basin east[J].Natural Gas Industry,2007,27(5):481-483.[伍菁华,黄芸,张继武,等.火山岩相地震识别方法在准噶尔盆地东部的应用[J].天然气工业,2007,27(5):481-483.]
[8]Yan Yaomin,Wang Yingmin,Zhu Yanhe,et al.Model of sedimen-tary facies in Jiamuhe Formation,northwestern margin of Junggarbasin[J].Natural Gas Geoscience,2007,18(3):386-388.[颜耀敏,王英民,祝彦贺,等.准噶尔盆地西北缘五八区佳木河组含火山岩系沉积模式[J].天然气地球科学,2007,18(3):386-388.]
[9]Wang Ling,Sun Xiping,Zhang Yan,et al.Volcanic massif ge-netic mechanism and volcanic facies controlled by deep zonefaulted systems in Songliao basin:A case in Xushen area[J].Natural Gas Geoscience,2007,18(3):389-393.[王玲,孙夕平,张研,等.松辽盆地深层断裂体系对火山岩成因和火山岩相带的控制———以徐深地区为例[J].天然气地球科学,2007,18(3):389-393.]
①史基安,等.准噶尔盆地腹部陆西地区二叠系佳木河组—上石炭统优质储层控制因素研究.新疆油田公司勘探开发研究院,中国科学院兰州地质研究所.2007:1-98.
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