摘要
南海北部神狐陆坡区富含海洋油气资源和天然气水合物,其海底地质环境对于各项资源开采活动和工程建设尤为重要,但目前专项研究较少.在大量二维地震资料解译的基础上,结合浅地层剖面和多波束测深资料,对该区海底地质环境进行整体研究,识别出20种灾害地质因素.按照动力来源,将该海域地质灾害归纳为构造应力、重力、水动力、气动力和土动力5大类灾害地质类型,每种类型包含多种灾害地质因素.依据各灾害因素总体平面分布特征,划分出埋藏三角洲密集区、海底滑坡密集区、火山密集区、软弱层密集区、浅断裂密集区和浅埋基岩面密集区6个灾害大区.还对主要灾害因素的地震反射特征和灾害性进行了研究,为该区未来工程建设的顺利开展提供科学的参考.
Since Shenhu continental slope in the northern South China Sea is rich in oil and gas resources as well as natural gas hydrate, and its seabed stability is important for oil and gas exploitation and engineering projects. But special study on seabed stability here is far from being enough now. Based on interpretation of 2D seismic data, shallow profiles and multi-beam echo sounder data, this paper focuses on the whole geological environment of this area and identifies 20 different kinds of hazardous geological factors. According to the dynamic source, five hazard types are concluded as follows., tectonic stress-related, gravity-related, hydrodynamics-related, gas effusion-related and soil-related hazards. Each type includes multi-hazardous fac- tors. According to the plan-view distribution of the hazardous geological factors, this area can be divided into the following six hazard regions： intensive areas of buried delta, submarine landslides, volcanism, weak layers, shallow fracture zone and shal- low bedrock. Major hazardous factors and their seismic reflection characteristics are presented to provide scientific reference for development of future engineering projects in the study area.
出处
《地球科学（中国地质大学学报）》
EI
CAS
CSCD
北大核心
2014年第9期1364-1372,共9页
Earth Science-Journal of China University of Geosciences
基金
中国地质调查局专项项目(No.GZH201100311-03-06)
国家自然科学基金项目(No.41190072)
关键词
南海
神狐陆坡
灾害
分类
反射特征
the South China Sea
Shenhu continental slope
hazards
classification
reflection characteristics.
