东海陆架盆地瓯江凹陷明月峰组沉积相及沉积特征分析
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摘要
通过岩心观察描述,综合测井、录井、古生物、重矿物等资料,结合地震相分析,以瓯江凹陷构造演化及相对海平面变化为主线,从物源分析出发,综合分析瓯江凹陷明月峰组沉积相类型及沉积特征。晚古新世明月峰组沉积期,瓯江凹陷处于断拗转换阶段,沉积物源由凹陷西侧的闽浙隆起带酸性火山岩源区和凹陷东侧的雁荡低凸起提供,以闽浙隆起带物源占绝对优势,受中古新世至晚古新世中期大规模海侵的影响,相对海平面持续升高,凹陷东侧雁荡低凸起开始接受沉积,使得凹陷沉积范围达到断陷期最大,总体呈滨海—浅海沉积,闽浙隆起带物源供应充分,在凹陷西缓坡发育3个大型三角洲沉积,滨海沉积发育于凹陷西缘三角洲之间及雁荡低凸起位置,凹陷中央发育大范围的浅海沉积。控制明月峰组各沉积相空间展布的主控因素是构造和相对海平面变化,以相对海平面变化为主。
By means of cores description,well log,logging,paleontology,heavy minerals,and seismic facies,we elucidate the material source of Mingyuefeng Formation in the Oujiang sag,and then comprehensively discuss sedimentary facies and its features,based on structural evolution and relative sea level change.At late Paleocene Mingyuefeng Phase,the Oujiang sag experienced the fault switching sag,the source sediments were transported from two sides of sag,the main source was Mingzhe structural belt in the western sag,and the second was Yandang low bump in the eastern.When the large-scale transgression at middle and later Palaeocene caused the relative sea level rising,the Yandang low bump started accept the sediments and reached the biggest sedimentary area.The sedimentary facies of the sag are representative of seashore and shallow sea,with the abundance of sediment supply from the Mingzhe structural belt.Three large-scale delta sediments were formed at the western slope of sag,where the seashore sediment lie at the margin of sag,and the shallow sea sediment was located in the centre of sag.The distribution of sedimentary facies is mainly controlled by structure and the of relative sea level change,especially the later.
By means of cores description,well log,logging,paleontology,heavy minerals,and seismic facies,we elucidate the material source of Mingyuefeng Formation in the Oujiang sag,and then comprehensively discuss sedimentary facies and its features,based on structural evolution and relative sea level change.At late Paleocene Mingyuefeng Phase,the Oujiang sag experienced the fault switching sag,the source sediments were transported from two sides of sag,the main source was Mingzhe structural belt in the western sag,and the second was Yandang low bump in the eastern.When the large-scale transgression at middle and later Palaeocene caused the relative sea level rising,the Yandang low bump started accept the sediments and reached the biggest sedimentary area.The sedimentary facies of the sag are representative of seashore and shallow sea,with the abundance of sediment supply from the Mingzhe structural belt.Three large-scale delta sediments were formed at the western slope of sag,where the seashore sediment lie at the margin of sag,and the shallow sea sediment was located in the centre of sag.The distribution of sedimentary facies is mainly controlled by structure and the of relative sea level change,especially the later.
引文
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[3]Zhang Shengping,Lv Baofeng,Xia Bin,et al.The structural trans-fer zone and it scientific significance on oil and gas accumulation inthe Lishui-Jiaojiang sag,East China Sea[J].Natural Gas Geosci-ence,2007,18(5):653-656.[张升平,吕宝凤,夏斌,等.东海盆地丽水—椒江凹陷构造转换带及其对油气藏形成和分布的意义[J].天然气地球科学,2007,18(5):653-656.]
[4]Zheng Qiugen,Zhou Zuyi,Cai Liguo,et al.Meso-Cenozoic tec-tonic setting and evolution of East China Sea shelf basin[J].Oil and Gas Geology,2005,26(2):197-201.[郑求根,周祖翼,蔡立国,等.东海陆架盆地中新生代构造背景及演化[J].石油与天然气地质,2005,26(2):197-201.]
[5]Wu Fadong,Zhang Yanmei,Zhou Ping,et al.Tertiary basinsetting analysis and sedimentary dynamics of the East ChinaSea shelf basin[J].Geoscience,1999,13(2):157-161.[武法东,张艳梅,周平,等.东海陆架盆地第三系沉积—构造动力背景分析[J].现代地质,1999,13(2):157-161.]
[6]Zhao Hongge,Liu Chiyang.Approaches and prospects ofprovenance analysis[J].Acta Sedimentologica Sinica,2003,21(3):409-415.[赵红格,刘池洋.物源分析方法及研究进展[J].沉积学报,2003,21(3):409-415.]
[7]Xu Yajun,Du Yuansheng,Yang Jianghai.Prospects of sedimentprovenance analysis[J].Geological Science and Technology Infor-mation,2007,26(3):26-32.[徐亚军,杜远生,杨江海.沉积物物源分析研究进展[J].地质科技情报,2007,26(3):26-32.]
[8]He Zhonghua,Liu Zhaojun,Zhang Feng.Latest progress ofheavy mineral research in the basin ananlysis[J].GeologicalScience and Technology Information,2001,20(4):29-32.[何钟铧,刘招君,张峰.重矿物分析在盆地中的应用研究进展[J].地质科技情报,2001,20(4):29-32.]
[9]Got H,Monaco A,Vittori J,et al.Sedimentation on the Ioni-an active margin(Hellenic arc):Provenance of sediments andmechanisms of deposition[J].Sedimentary Geology,1981,28(4):243-272.
[10]Li Zhen,Jiao Yangquan,Liu Chunhua,et al.Provenance anal-ysis of heavy mineral in Gaoliu area of Huanghua depression[J].Petroleum Exploration and Development,1998,25(6):5-7.[李珍,焦养泉,刘春华,等.黄骅凹陷高柳地区重矿物物源分析[J].石油勘探与开发,1998,25(6):5-7.]
[11]Zheng Rongcai,Wang Haihong,Han Yonglin,et al.Sedimen-tary facies characteristics and sandbody distribution of Chang6 Member in Jiyuan area of Ordos basin[J].Lithologic Reser-voirs,2008,20(3):21-26.[郑荣才,王海红,韩永林,等.鄂尔多斯盆地姬塬地区长6段沉积相特征和砂体展布[J].岩性油气藏,2008,20(3):21-26.]
[12]Cao Guanghua,Hu Yahua,Zhang Qiwen,et al.Study on themethod of identification of sedimentary microfacies using welllogging data[J].Science Technology and Engineering,2007,15(7):3674-3680.[曹广华,胡亚华,张奇文,等.利用测井资料识别沉积微相方法研究[J].科学技术与工程,2007,15(7):3674-3680.]
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