东海陆架沙脊三维地震地貌学、演化及成因

现代地质 ›› 2013, Vol. 27 ›› Issue (4): 783-790.

东海陆架沙脊三维地震地貌学、演化及成因

李磊¹，王小刚²，曹冰³，申雯龙³，杨林⁴

(1.西安石油大学地球科学与工程学院，陕西西安710065；2.中海油田服务股份有限公司油田技术事业部，河北三河065201； 3.中海石油(中国)有限公司上海分公司,上海200030；4.陕西延长石油国际勘探开发工程有限公司,陕西西安710075)

出版日期:2013-08-10 发布日期:2013-08-07
作者简介:李磊，男，博士，讲师，1979年出生，地质资源与地质工程专业，主要从事深水沉积及储层预测研究。 Email：lihanlei@sina.com。
基金资助:
国家“973”计划项目(2009CB219407)；国家自然科学基金项目(40572067)。

Seismic Geomorphology, Evolution and Genesis of Shelf Sand Ridge, East China Sea

LI Lei¹, WANG Xiao-gang2, CAO Bing³, SHEN Wen-long³, YANG Lin⁴

(1.School of Earth Sciences and Engineering, Xian Shiyou University, Xian,Shaanxi710065, China;2.Well Technology Department, China Oilfield Services Limited, Sanhe,Hebei065201, China;3.Shanghai Branch, CNOOC Ltd, Shanghai200030, China; 4.Shaanxi Yanchang Petroleum International Exploration & Development Engineering CoLtd, Xi'an,Shaanxi710075, China)

Online:2013-08-10 Published:2013-08-07

摘要/Abstract

摘要：

线状陆架沙脊一直是海洋地质学和沉积学研究的热点。基于东海近海底1 700 km2的三维地震数据，对陆架沙脊开展地震地貌学、沉积构型、成因和演化研究，并取得以下3点认识：(1)研究区发育7条NW-SE向陆架沙脊体系，海底呈槽脊相间地形特征。沙脊表面发育NE-SW向沙波体系。脊1、脊2、脊4和脊6表现为2~3条交叉或合并的沙脊体系，而脊3、脊5和脊7呈现为独立沙脊体系。(2)线状陆架沙脊横剖面左右不对称，宽2~11 km，脊高3~31 m，坡面相对较缓，倾角大多小于1°。(3)研究区水深变化和近海底潮流速度等因素指示研究区沙脊处于活动沙脊和衰亡沙脊的过渡阶段。研究第四纪陆架沙脊对沙脊储层的预测具有一定的指导意义。

关键词: 第四系, 陆架沙脊, 地震地貌学, 东海

Abstract:

The study on linear shelf sand ridges is always a hot topic in the field of marine geology and sedimentology. On the base of nearseafloor 3D seismic data which covers an area of 1 700 km2, the seismic geomorphology, sedimentary architecture, genesis and evolution of the shelf sand ridges were discussed in this paper. The following conclusions have been drawn from this study: (1) 7 NWSE oriented shelf sand ridge systems have developed in this study area. The seafloor in the study area is characterized by a ridgeandswale topography. Sand waves oriented NESW have been observed in the surface of the sand ridges. The ridge 1, ridge 2, ridge 4 and ridge 6 were composed of 2 to 3 crosscombining sand ridges. While the ridge 3, ridge 5 and ridge 7 were revealed as a single sand ridge in the study area. (2)The linear sand shelf ridges are asymmetric in cross section and are oriented parallel to the current direction. The sand ridges have a length between 2 km and 11km. Their heights are from 3 m to 31 m. The angle of dip of the slope is mostly less than 1°. (3) In this study area, the stage of the sand ridges between active sand ridge and moribund sand ridge have been indicated by the change of water depth and the velocity of tidal current. Investigation of sand ridges on the Quaternary shelf is of critical importance for predicting tidal sand reservoirs.

Key words: Quaternary, shelf sand ridge, seismic geomorphology, East China Sea

中图分类号:

TE121.2

李磊，王小刚，曹冰，申雯龙，杨林. 东海陆架沙脊三维地震地貌学、演化及成因[J]. 现代地质, 2013, 27(4): 783-790.

LI Lei1, WANG Xiao-gang2, CAO Bing3, SHEN Wen-long3, YANG Lin4. Seismic Geomorphology, Evolution and Genesis of Shelf Sand Ridge, East China Sea[J]. Geoscience, 2013, 27(4): 783-790.

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