琼东南盆地L区块体搬运沉积三维地震构型表征及其成因  

Three Dimensional Seismic Configuration Characterization and Genesis of Mass Transport Deposits in Block L of the Qiongdongnan Basin

作　　者：柯旭栋 李磊 颉宇凡 薛国庆 王文杰 杨怡飞[1,6] KE Xudong;LI Lei;JIE Yufan;XUE Guoqing;WANG Wenjie;YANG Yifei(School of Earth Science and Engineering,Xi'an Shiyou University,Xi'an,Shaanxi 710300,China;School of Geophysics and Information Technology,China University of Geosciences(Beijing),Beijing 100083,China;Xinjiang Geological Institute of China Metallurgical Geology Bureau,Urumqi,Xinjiang 830063,China;CNOOC(China)Ltd.,Hainan Branch,Haikou,Hainan 570300,China;PetroChina Changqing Oilfield Company,Qingyang,Gansu 745100,China;School of Geosciences,China University of Petroleum(East China),Qingdao,Shandong 266580,China)

机构地区：[1]西安石油大学地球科学与工程学院,陕西西安710300 [2]中国地质大学(北京)地球物理与信息技术学院,北京100083 [3]中国冶金地质总局新疆地质勘查院,新疆乌鲁木齐830063 [4]中海石油(中国)有限公司海南分公司,海南海口570300 [5]中国石油天然气股份有限公司长庆油田第二采油厂,甘肃庆阳745100 [6]中国石油大学(华东)地球科学与技术学院,山东青岛266580

出　　处：《海洋石油》2025年第1期13-19,31,共8页Offshore Oil

基　　金：国家级大学生创新创业训练计划项目(202110705051)。

摘　　要：块体搬运沉积(mass transport deposits,MTDs)是目前海洋研究方面的热点,而块体搬运沉积内部具有什么样的形态特征依然不够明确。该文基于琼东南盆地陵水凹陷高精度三维地震资料,描述了陵水凹陷L区块体搬运沉积三维地震构型,研究了盆地内深水沉积物内部结构、特征及形成机制,识别了侵蚀擦痕、逆冲推覆构造、挤压脊、水道等构造特征,并结合剖面、平面特征推测其成因及其分布规律,探讨了MTDs形成的特殊构造,并提出了三个假设:在流动开始之前已存在,并在层内被动运输;在流动运动中形成;在流动停滞期间形成。MTDs沉积层内部致密,鲜有贯穿性构造,是油气储集中良好的盖层。Mass transport deposits(MTDs)are currently a hot topic in marine research,but the morphological characteristics of mass transport deposits remain unclear.Based on high-precision three-dimensional seismic data from Lingshui Sag in Qiongdongnan Basin,this article describes the three-dimensional seismic configuration of mass transport deposits in Lingshui Sag.It studies the internal structure,characteristics and formation mechanism of deep-water sediments in the basin,and identifies structural features such as erosion scratches,thrust nappe structures,compression ridges and channels.The causes and distribution of MTDs are speculated by studying their sectional and planar characteristics.Finally,the special structures formed by MTDs are discussed and three hypotheses are put forward.MTDs exist before the flow initiation and it is transported passively within layers;MTDs are formed during flow movement;MTDs are formed during the flow stagnation.The MTDs sedimentary layers are dense inside with few penetrative structures,making them excellent cap rocks for oil and gas reservoirs.

关 键 词：琼东南盆地 块体搬运沉积 沉积物重力流 沉积构型 

分 类 号：P618.13[天文地球—矿床学]