荔湾3-1气田海底管道深水段地质灾害特征  

Geologic Hazards in the Deep Pipeline Routing Area of the Liwan 3-1 Gas Field in the South China Sea

作　　者：刘乐军[1] 傅命佐[1] 李家钢 李西双[1] 陈义兰[1] 高珊[1] 

机构地区：[1]国家海洋局第一海洋研究所,山东青岛266061 [2]中海油研究总院工程研究设计院,北京100027

出　　处：《海洋科学进展》2014年第2期162-174,共13页Advances in Marine Science

基　　金：国家重大科技专项--荔湾3-1及其周边气田地质灾害风险评价研究(2011ZX05056-001-02);国家自然科学基金项目--基于地震相分析的南黄海埋藏古河道地质灾害危险性评价研究(40606015)

摘　　要：基于船载多波束测深、浅地层剖面和深水浅层高分辨多道地震剖面等数据资料,以我国第一个深水气田—荔湾3-1气田海底管道路由区深水段(>200m)为研究区,划分海底地形地貌分区,识别可能危害海底管道的地质灾害类型,分析其特征与分布规律。结果表明,研究区内主要地质灾害类型为海底峡谷、海底滑坡和滑塌、古珊瑚礁、海底沙波和大波痕、海底陡坎、断崖和陡坡、碎屑流沉积和浊流沉积等。其中,海底滑坡和滑塌在上陆坡和峡谷谷壁上十分发育,海底滑坡(滑塌)、古珊瑚礁和沙波(沙丘)等影响和威胁着海底管道的铺设与安全运行。Based on the data obtained by means of multibeam sounding, shallow stratum profiling and high- resolution deep-water shallow-stratum multichannel seismic profiling, and by taking the deep pipeline routing area （〉200m） in the Liwan 3-1 Gas Field, the first deep-water gas field in China, as the study area as well, the seafloor topographic and geomorphologic zonings are subdivided, the types of geologic hazards which may be harmful to the submarine pipelines are identified and their features and distributions are analyzed. The results indicate that the main types of geologic hazards occurring in the study area include the submarine canyons, the underwater landslides and slumps, the ancient coral reefs, the seabed sand waves and mega ripples, the submarine cliffs, fault scarps and abrupt slopes and the debris flow and turbidity current deposits. Of them, the underwater landslides and slumps are well developed on the continental shelf and the wall of canyons. It is mainly the underwater landslides/slumps, the ancient coral reefs and the sand waves/dunes that influence and threaten the layout and operation safety of the submarine pipelines.

关 键 词：荔湾3-1气田 海底管道 地质灾害类型 

分 类 号：P736.5[天文地球—海洋地质]