【作者】 高小惠；

【导师】 亓发庆；

【作者基本信息】 国家海洋局第一海洋研究所 ， 海洋地质， 2010， 硕士

【摘要】 辽东湾顶部浅海区蕴藏着丰富的油气资源,具有广阔的开发前景。本文针对该区油气资源开发所面临的关键问题,即灾害地质环境及海底稳定性,选择油气资源开发区作为重点研究区,进行了系统分析和综合评价。灾害地质类型的形成与发展与其所处的自然环境密切相关。本文在搜集了本区域进行的大量环境、地质调查资料的基础上,从水文气象、地形地貌、沉积环境、声学地层、工程地质和构造、地震等方面对研究区进行灾害地质环境背景分析,辨识各种灾害地质类型,为综合评价准备素材,奠定基础。同时讨论了灾害地质与地质灾害的科学含义以及两者之间的联系和区别,并就当前对灾害地质类型的划分方法作了系统归纳,从而选择了适合于辽东湾浅海油气区海洋开发的灾害地质类型划分方案。通过对该区各种资料的系统分析,判识出潜在的多种灾害地质类型,分别为潮流冲刷槽、浅滩、埋藏古河道、浅层气、易液化砂层和软弱地层等。从形成机制、分布特征和潜在危害性等角度出发,对这些类型进行了重点分析。将上述灾害地质类型作为评价指标,利用层次分析法和正态分布函数确定各指标的权值和隶属度,构建海洋灾害地质风险评价指标体系,建立模糊综合评价模型,对油气开发重点研究区的海底稳定性进行了定量评价,获得综合评价结果图,根据评价结果划分为五个级别的风险区。评价结果较为客观和真实的反映了海区海底灾害地质危害性和分布特征,对于海底工程布局和预测、防避相关地质灾害来说,具有实际应用价值。更多还原

【Abstract】 There are abundant oil and gas resources at the shallow-sea area of north Liaodong Bay,which has great potential development value. While the seabed stability is the basis of ocean development,in this thesis,based on the sufficient study of geohazards of oil and gas resources development area of Liaodong Bay,the seabed stability is synthetically evaluated.The forming and developing of geohazards is closely related to the environment. This thesis discusses the geohazards environment backgrounds from the next 6 aspects,such as hydrometeor,topography and geomorphy,deposited environment,acoustic stratigraphy,engineering geology and tectonic character etc,so as to identify the geohazards types and lay a foundation for the comprehensive evaluation. At the same time,the concepts of geohazards and geology disaster are explained and the difference is pointed. After concluding the different sorted methods of geohazards,a method which is more compatible to ocean development is brought forward. By the collected information of this area,there are several kinds of geohazards which have potential menace to seabed structures,such as tidal scour trough,shoal,buried paleo channel,shallow gas,liquefaction sand layer and soft layer. From their forming,distribution and potential menace,this thesis carefully analyzes these geohazards factors.Regarding the above geohazards factors as evaluation indicators,and determining their weight values and membership degrees using analytic hierarchy process and normal distribution function,the fuzzy comprehensive evaluation model is established to quantificationally evaluate the geohazards risk of study area. According to the evaluation results,the study area is divided into five risk-level regions. It objectively and authentically reflects the geohazards risk and its distribution features,and proves that the study of this thesis is beneficial for the seabed structures and geological disaster prediction.更多还原