| 嫩江现代河流沉积层序及沉积模式 |
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| 引用本文： | 王平在,王俊玲.嫩江现代河流沉积层序及沉积模式[J].沉积学报,2003,21(2):228-233. |
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| 作者姓名： | 王平在 王俊玲 |
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| 作者单位： | 1.中国矿业大学北京研究生院 北京 100083; |
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| 摘 要： | 以黑龙江省富裕县大马岗现代嫩江沉积体为例,通过深挖探槽、探坑及野外密集采样的精细解剖,详细研究了现代嫩江大马岗沉积体内部岩相、沉积微相、沉积层序及沉积模式。研究表明,大马岗河流沉积体是一个由辫状河与曲流河沉积组成的复合沉积体,其下部以辫状河砾质坝沉积为主,上部则以低能量的曲流河沉积为主。在现代嫩江大马岗沉积体内部,共识别出16种岩相,即Gm,St1,St2,Ft,Ssd,Sh,Stcb,Shcs,Sw,Sm,Fw,Fm,Fsc1,Fsc2,Mm及Mpr,发育五种亚相、六种沉积微相,即曲流河的河漫滩沉积微相、决口扇微相、天然堤微相、点坝微相、辫状河的溢岸微相及心滩微相。这些沉积微相构成了大马岗沉积体内部垂向上三套不同的沉积层序:下部层序以砾石质沉积为主,为辫状河沉积形成;中部层序为一个完整的曲流河沉积层序,以曲流河点坝沙及溢岸漫滩泥沉积构成;上部沉积层序则为曲流河泛滥及决口沉积形成。通过沉积微相及沉积层序分析,本文建立了一种新型的河流复合沉积模式,进一步丰富了河流沉积学理论。
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| 关 键 词： | 现代沉积 嫩江 岩相 沉积微相 沉积层序 沉积模式 |
| 文章编号： | 1000-0550(2003)02-0228-06 |
| 收稿时间： | 2001-11-13 |
| 修稿时间： | 2001年11月13日 |
Sedimentary Sequence and Model of Modern Nenjiang River |
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| WANG Ping-zai,WANG Jun-ling.Sedimentary Sequence and Model of Modern Nenjiang River[J].Acta Sedimentologica Sinica,2003,21(2):228-233. |
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| Authors: | WANG Ping-zai WANG Jun-ling |
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| Institution: | 1.Postgraduate Institute of Chinese Mineral University,Beijing 100083;2.Petroleum Exploration & Production Institute,SINOPEC,Beijing 100083 |
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| Abstract: | Taking modern deposit of Nenjiang river at Damagang,Fuyu,Heilongjiang,as an example,this paper studied in detail the intrior lithofacies,sedimentary microfacies,sedimentary sequences and model of modern deposit of Nenjiang river at Damagang,by fine dissection of digging exploration troughs and pits and densely collecting samples. The study indicates that Damagang deposit is a complex consisting of sediments from the braided stream and meandering river,with pebby bar of the braided stream in the lower and the low-energy meandering river deposit in the upper.There are 16 kinds of lithofacies identified in Damagang deposit of modern Nenjiang river:Gm,St1,St2,Ft,Ssd,Sh,St,Stcb,Shcs,Sw,Sm,Fw,Fm,Fsc1,Fsc2,Mm and Mpr.Five kinds of subfacies and six kinds of sedimentary microfacies were developed well,including fluvial flood-plain microfacies,crevasse-splay microfacies,natural levee microfacies,point bar microfacies of the meandering river,and flood-plain microfacies and mid-channel bar microfacies of the braided river.These sedimentary microfacies form three sets of different sedimentary sequences in vertical in Damagang deposit,i.e. the lower sequence consist mainly of pebby sediments of braided river the middle sequence is an integrated meandering river deposit,consisting of sand of point-bar and shale of flood-plain of meandering river,and the upper sequence consists of flodd-plain and crevasses-splay of meandering river.By analysing sedimentary microfacise and sedimentary sequences,this paper built a new fluvial complex sedimentary model and it will contribute to the theory of fluvial sedimentology. |
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| Keywords: | modern deposit Nenjiang lithofacies sedimentary microfacies sedimentary sequence sedmentary model |
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