| 东海陆架盆地西湖凹陷平湖组-花港组沉积层序 |
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| 引用本文： | 周瑞琦,傅恒,徐国盛,苗清,付振群.东海陆架盆地西湖凹陷平湖组-花港组沉积层序[J].沉积学报,2018,36(1):132-141. |
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| 作者姓名： | 周瑞琦 傅恒 徐国盛 苗清 付振群 |
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| 作者单位： | 1.四川省煤田地质工程勘察设计研究院油气瓦斯所, 成都 610072; |
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| 基金项目： | 中海石油(中国)有限公司上海分公司项目 |
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| 摘 要： | 东海陆架盆地地处欧亚板块东部边缘，勘探开发实践表明，盆地内西湖凹陷天然气圈闭资源雄厚，具有很好的勘探前景。利用Vail层序地层学理论，依托钻录井、地震资料等，将新生代7次全球海平面显著下降所形成的不整合界面判别为7个二级层序界面。平湖组和花港组组成2个二级层序（SSQ3-SSQ4）和6个三级层序（SQ1-SQ6），坡折带之下可识别出低位体系域、海侵体系域和高位体系域，坡折带之上仅识别出海侵体系域和高位体系域。西湖凹陷西缓坡带发育物源来自海礁隆起-渔山隆起的三角洲-陆棚（平湖组）或湖泊（花港组）沉积体系，东陡坡带发育物源来自钓鱼岛隆褶带的扇三角洲或近岸水下扇-陆棚（平湖组）或湖泊（花港组）沉积体系，沉积中心在东次凹。构造运动和物源供给决定西湖凹陷构造沉积格局，古气候和海平面升降对三级层序及其内部体系域发育的影响更大。
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| 关 键 词： | 东海 西湖凹陷 平湖组 花港组 层序地层 沉积模式 |
| 收稿时间： | 2016-04-26 |
Eocene Pinghu Formation-Oligocene Huagang Formation Sequence Stratig-raphy and Depositional Model of Xihu Sag in East China Sea Basin |
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| ZHOU RuiQi,FU Heng,XU GuoSheng,MIAO Qing,FU ZhenQun.Eocene Pinghu Formation-Oligocene Huagang Formation Sequence Stratig-raphy and Depositional Model of Xihu Sag in East China Sea Basin[J].Acta Sedimentologica Sinica,2018,36(1):132-141. |
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| Authors: | ZHOU RuiQi FU Heng XU GuoSheng MIAO Qing FU ZhenQun |
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| Institution: | 1.Petroleum Geology Engineering Investigation and Design Institute, Sichuan Provincial Coalfield Bureau, Chengdu 610072, China;2.Chengdu University of Technology, Chengdu 610059, China;3.Shanghai Branch of CNOOC(China) Ltd., Shanghai 200030, China;4.China Oilfield Services Limited, Langfang, Hebei 065201, China |
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| Abstract: | East China Sea basin is located in the eastern edge of the Eurasian plate,which is the margin rift basin by the strike-slip pulling of residual Diaoyu Island arc. Xihu Sag is the largest of all the tectonic units in the study area. Yuquan movement of late Eocene corresponded to Eocene-Oligocene Oi-1 quench event that caused about 70 m drop-ping of sea level,and Huagang movement of late Oligocene corresponds to the Paleogene-Neogene global Mi-1 cooling event that caused about 50 m dropping of sea level. All of these have a significant impact for tectonic-sedimentary evo-lution of Pinghu-Huagang Formation. Cenozoic the seven global sea level significant drops because of global climate changes corresponding to seven "tectonics" in East China Sea basin. Therefore,seven second sequences can be rec-ognized.Pinghu-Huagang Formations can be divided into two second sequences(SSQ3-SSQ4)and six third sequences (SQ1-SQ6)in Xihu sag. LST that is located in the slope zone of the east Xihu secondary sag is composed of sub-lacustrine fan,slope fan and lowstand wedge. In the western gentle slope zone TST is composed of predelta-shelf(or deep lake)mud that sourced from Haijiao-Yushan uplift,and in the eastern steep slope zone TST is composed of fan delta or nearshore subaqueous fan delta gravel-shelf(or deep lake)mud that sourced from Diaoyu uplift. In the west-ern gentle slope zone HST is composed of delta plain gravel-delta front sand-prodelta and shelf(or lake)mud that sourced from Haijiao-Yushan uplift,and in eastern steep slope zone HST is composed of fan delta or nearshore suba-queous fan delta sand and gravel-shelf(or deep lake)mud that sourced from Diaoyu uplift zone. Tectonics,paleocli-mate,sea-level and source are the main controlling factors for the third sequence and system tracts. |
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