南海北部陆架边缘区域地质灾害类型特征及分布规律

Features and distribution pattern of the geological hazards in the northern continental shelf margins of South China Sea

在对近10余年来珠江口盆地区域内惠州、西江、陆丰、番禺、恩平、流花、荔湾、白云等区块勘探开发过程中采集的三维地震资料、工程物探资料和工程地质钻探资料进行系统分析基础上,研究了该区域内与海洋工程密切相关的主要海洋地质灾害类型,包括沙波、珊瑚礁、硬质地层、海底峡谷、海底冲沟、海底陡坎、海底滑坡、断层、天然气水合物和浅层气等10种,阐述了这10种地质灾害类型的特征及分布规律,分析了其形成机制及对海洋油气勘探开发工程的潜在灾害影响,可为该地区海洋油气勘探开发采取相应的应对措施、降低海洋工程风险提供科学依据。

Based on the 3D seismic data, geophysical data and geotechnical data collected during the offshore oil and gas exploration and development activities in the past ten years in the blocks within the Pearl River Mouth basin, such as Huizhou, Xijiang, Lufeng, Panyu, Enping , Liuhua , Liwan , and Baiyun ,etc.,a systematical analysis was conducted concerning ten main types of marine geological hazards closely related to offshore engineering. These hazards include sand waves, coral reefs, hardpan, submarine seafloor can-yon, submarine seafloor gully, submarine seafloor escarpment, submarine seafloor landslides, faults, na-ural gas hydrate and shallow gas. Their features and distribution pattern were expounded ; and their form-ing mechanisms and potential disastrous influences on offshore oil and gas exploration and development projects were evaluated. The work here provides scientific basis for taking corresponding solutions to the geological hazards and reducing the risk in offshore oil and gas exploration and development activities in the region.