本文選題：陸坡限制型海底峽谷群 + 沉積物供給　； 參考：《沉積學(xué)報》2016年05期

【摘要】：珠江口盆地白云凹陷北部陸坡發(fā)育著17條近似NNW—SSE走向的海底峽谷,構(gòu)成了區(qū)域內(nèi)的陸坡限制型海底峽谷群�；谘芯繀^(qū)內(nèi)高密度覆蓋的2D地震資料,通過外部形態(tài)、內(nèi)部結(jié)構(gòu)等反射特征的描述和刻畫,建立了第四紀以來的高精度層序地層格架,將沉積充填序列劃分為三個體系域,即低位體系域(LST)、海侵體系域(TST)和高位體系域(HST)。根據(jù)陸坡進積特征、垂向地層疊加樣式、侵蝕特征變化、連續(xù)性強振幅同相軸的識別和空間追蹤,將高位體系域進一步劃分為兩個沉積旋回單元,HST-I和HST-II。研究表明,白云凹陷陸坡限制型海底峽谷群發(fā)育在高位體系域晚期沉積旋回(HST-II)中。在此基礎(chǔ)上,分別討論了沉積物供給、沉積物失穩(wěn)作用、限制型地形和流體滲漏作用對峽谷群形成和演化的影響。第四紀以來珠江水系攜帶的大量沉積物經(jīng)由陸架進入到陸坡區(qū)域,為海底峽谷群的發(fā)育和演化提供了充足的沉積物來源。在第四紀高位體系域早期水道形成的限制型"負地形"基礎(chǔ)上,大量的沉積物在沿著陸坡坡降方向自北向南的輸送過程中發(fā)生向下的侵蝕、沉積物失穩(wěn),導(dǎo)致了陸坡限制型海底峽谷群的發(fā)育。研究區(qū)內(nèi)廣泛分布的氣煙囪構(gòu)造,暗示了含氣流體的垂向運移和滲漏,可能促進了海底峽谷群的進一步演化。
[Abstract]:There are 17 submarine canyons similar to NNW-SSE strike on the northern slope of Baiyun Sag in the Pearl River mouth basin, which form the continental slope restricted submarine canyon group. Based on 2D seismic data covered by high density in the study area, the high precision sequence stratigraphic framework since Quaternary is established by describing and characterizing the reflection characteristics such as external morphology and internal structure, and the sedimentary filling sequence is divided into three system tracts. They are LSTL, TST and HST. According to the characteristics of continental slope precession, vertical stratigraphic superposition style, erosion feature change, identification and spatial tracing of continuous strong amplitude cophase axis, the high position system tract is further divided into two sedimentary cycle units, HST-I and HST-II. The results show that the restricted submarine canyons in Baiyun Sag are developed in the late stage of high system tract (HST-II). On this basis, the effects of sediment supply, sediment instability, restricted topography and fluid leakage on the formation and evolution of canyons are discussed respectively. Since the Quaternary, a large number of sediments carried by the Pearl River system have entered the continental slope through the continental shelf, which provides sufficient sediment sources for the development and evolution of submarine canyons. On the basis of the restricted "negative topography" formed in the early Quaternary high system tracts, a large number of sediments have been eroded downwards from north to south along the slope of the continental slope, resulting in instability of the sediments. It leads to the development of restricted submarine canyons on the continental slope. The widely distributed gas chimney structure in the study area implies the vertical migration and leakage of gas-bearing fluids and may promote the further evolution of submarine canyons.
【作者單位】： 中國科學(xué)院天然氣水合物重點實驗室;中國科學(xué)院廣州天然氣水合物研究中心;廣州海洋地質(zhì)調(diào)查局;
【基金】：國家自然科學(xué)基金項目(41576048) 油氣藏地質(zhì)及開發(fā)工程國家重點實驗室(成都理工大學(xué))開放基金項目(PLC201402) 中科院可再生能源重點實驗室開放基金項目(y507j61001) 中國科學(xué)院青年創(chuàng)新促進會(2016312) 中國石油—中國科學(xué)院科技合作項目(2015A-4813)~~
【分類號】：P618.13;P736

【相似文獻】

相關(guān)期刊論文 前4條

1 丁鋒;張靖;王品紅;田坤;趙開梅;;一種850nm氧化限制型垂直腔面發(fā)射激光器的設(shè)計[J];半導(dǎo)體光電;2013年01期

2 陳佳蕾;楊士林;;限制型量子超群O_q(GL(1|1))'[J];北京工業(yè)大學(xué)學(xué)報;2012年03期

3 蘇志雄,郭嗣琮;等式限制型模糊級數(shù)[J];科學(xué)技術(shù)與工程;2004年06期

4 ;[J];;年期

相關(guān)會議論文 前1條

1 岳愛文;王任凡;沈坤;石兢;李洛;唐建冠;;高性能850nm氧化限制型VCSELs研究[A];全國第十一次光纖通信暨第十二屆集成光學(xué)學(xué)術(shù)會議（OFCIO’2003）論文集[C];2003年

相關(guān)重要報紙文章 前2條

1 李云華邋宗時風(fēng);銀川轉(zhuǎn)變管理模式掃除“犬患”[N];寧夏日報;2007年

2 王英霞 翟世民;培養(yǎng)孩子的自主性[N];山西日報;2003年

，

本文編號：1836889