多种方法综合探讨白云凹陷深水沉积岩性圈闭边界     

石宁  刘军  颜承志  柳保军  胡琏  张卫卫  吴亚娇 《现代地质》2014,28(6):1289-1296

为降低深水勘探风险,准确识别白云深水区岩性圈闭边界,采用多种技术手段相结合的方法,对深水沉积岩性圈闭的边界进行研究。在层序地层格架、沉积体系控制下,锁定岩性圈闭形成的有利区带;建立深水重力流沉积储层岩相组合正演模型;利用地震波形分析技术,识别储层与非储层,精细刻画水道沉积充填特征、扇体内部结构、砂体堆砌方式等微观结构;结合储层反演,以及多种地震属性,进一步综合识别岩性圈闭边界。研究成果总结了白云深水陆坡重力流水道砂岩,斜坡扇、盆底扇砂岩岩性圈闭的边界识别特征,并应用到勘探实践中,取得了良好的勘探成果。  相似文献   

长江口北槽深水航道工程对周边滩涂冲淤影响研究   总被引：9，自引：6，他引：3  

杜景龙  杨世伦 《地理科学》2007,27(3):390-394

采用长江口深水航道治理一、二期工程实施前后的地形资料,在G IS软件及相关的统计分析软件的支持下,分析治理工程对九段沙(包括江亚南沙)和横沙东滩冲淤演变的影响。结果表明:工程建设6年来两岸滩涂面积增长了97 km²,其中横沙东滩优先采取了促淤工程,淤积规模较大,滩地面积累计增长了46 km²,是工程前的1.68倍;九段沙的淤积主要是受整治工程南导堤的影响,其中九段上沙及江亚南沙淤积最为强烈,工程后的面积分别是工程前的1.83倍和2.34倍。  相似文献   

Migrated hybrid turbidite-contourite channel-lobe complex of the late Eocene Rovuma Basin,East Africa     

Yintao Lu  Xiwu Luan  Boqing Shi  Weimin Ran  Fuliang Lü  Xiujuan Wang  Quanbin Cao  Xiaoyong Xu  Hui Sun  Genshun Yao 《海洋学报(英文版)》2021,40(2):81-94

Analysis of 3 D seismic data and well log data from the Rovuma Basin in East Africa reveals the presence of a late Eocene channel-lobe complex on its slope. The first two channels, denoted as channel-1 and channel-2, are initiated within a topographic low on the slope but come to a premature end when they are blocked by a topographic high in the northwest region of the basin. New channels migrate southeastward from channel-1 to channel-6 due to the region's sufficient sediment supply and stripping caused by bottom currents. The primary factors controlling the development of the channel complex include its initial paleo-topographic of seafloor, the property of gravity flows, the direction of the bottom current, and the stacking and expansion of its levees. The transition zone from channel to lobe can also be clearly identified from seismic sections by its pond-shaped structure. At a certain point, thest systems record a transiton from erosive features to sedimentary features, and record a transition from a confined environment to an open environment. Channels and lobes can be differentiated by their morphologies: thick slump-debris flows are partly developed under channel sand sheets,whereas these slump-debris flows are not very well developed in lobes. Well log responses also record different characteristics between channels and lobes. The interpreted shale volume throughout the main channel records a box-shaped curve, thereby implying that confined channel complexes record high energy currents and abundant sand supply, whereas the interpreted shale volume throughout the lobe records an upward-fining shape curve,thereby indicating the presence of a reduced-energy current in a relatively open environment. Within the Rovuma Basin of East Africa, the average width of the Rovuma shelf is less than 10 km, the width of the slope is only approximately 40 km, and the slope gradient is 2°–4°. Due to this steep slope gradient, the sand-rich top sheet within the channel also likely contributes to the straight feature of the channel system. It is currently unclear whether the bottom current has any effect on its sinuosity.  相似文献   

南海北部白云凹陷深水油气区的重-震数据处理与分析          下载免费PDF全文

秦芹  吴时国 《CT理论与应用研究》2017,26(6):695-706

白云凹陷位于南海北部陆缘深水地带,是我国深水油气资源勘探的重要地区。开展重-震成像研究,是分析该区烃源岩分布特征、大型构造圈闭、成藏层系与储层条件的重要方法。本文通过重力异常、地震Vs波速结构模型及地震勘探剖面分析,获得研究区自由空间重力异常、布格重力异常、水平和垂向梯度、密度反演图像、Vs波速度结构图像以及高分辨率地震勘探剖面图像。重力图像揭示:白云凹陷中心的强负值异常图像与较厚沉积和基底起伏有关;凹陷东侧相对高正值局部重力圈闭与中生代残余地层有关;凹陷北侧条带状正异常则与陆坡向洋盆过渡时基底下凹有关。白云凹陷的主凹陷和南凹陷存在明显的层状负剩余密度或相对低密度区,是有利的含油气层位。地震图像揭示:白云凹陷由北向南存在明显的细颈化带、外缘隆起带、洋陆过渡带等结构。在陆缘地壳强烈伸展薄化期间,白云凹陷形成大型三角洲-湖相烃源岩沉积环境的凹陷结构,沉积物源主体来自北侧。随着地壳强烈减薄的细颈化,凹陷出现明显的台阶式沉陷,导致陆架坡折带由南向北迁移,形成陆架边缘三角洲、深水重力流水道和深水扇等有利的储层。高分辨率地震资料获取的地震勘探剖面图像上,可以识别出许多浅层气运移通道,表明白云凹陷丰富的中、浅层气大多来源于深部地层。   相似文献   

抗冰导管架平台动力特性分析     

张大勇  岳前进  车啸飞  刘圆  李辉辉 《海洋工程》2010,28(1)

目前的抗冰导管架平台结构设计主要是考虑极限冰力引起的破坏,尚未形成基于动冰力响应分析的结构设计。为了更好研究冰荷载、冰激振动机理以及提出合理的概念设计,冰荷载下抗冰导管架结构的动力特性分析是十分必要的。基于现场冰与导管架结构相互作用的多年观测以及数值模拟研究,分析渤海辽东湾典型导管架结构在交变冰力作用下的动力特性,提出了适于冰荷载研究与抗冰导管架结构概念设计、分析的简化力学模型,解释柔性抗冰导管架结构动力效应显著的原因。  相似文献   

Reliability-Based Load and Resistance Factors Design for Offshore Jacket Platforms in the Bohai Bay: Calibration on Target Reliability Index     

金伟良  胡琦忠  沈照伟  时忠民 《海洋工程》2009,(1):15-26

The target reliability index has been effectively used as the best solution to deal with the relationship between the structural safety and the optimal economy in any structural design. However, the target reliability index for off-shore jacket platforms based on different sea areas in China has never been calibrated. This paper presents an approach for its calibration, and suggests many kinds of associated load cases. The uncertainties of loads and structural resistance are mainly investigated. The target reliability index for structural components, tubular joints and piles of offshore jacket platforms are discussed respectively in detail. Finally, through the calibrated results from the offshore jacket platforms of QK18-1, JZ20-2, SZ36-1 and BZ28-1 in the Bohai Bay, it is proposed to adopt 2.8 as the target reliability index of offshore jacket platforms in the Bohai Bay for a 25-year design period. The results provide significant reference for the design of offshore jacket platforms.  相似文献   

上海洋山深水港区海域悬沙分布特征及运动规律分析   总被引：4，自引：0，他引：4  

左书华  李蓓  杨华 《海洋通报》2009,28(3)

以1998年以来定点实测含沙量资料为基础,结合1996-2007年不同时刻卫星遥感影像资料对洋山港附近海域悬沙分布特征及运动规律进行分析,结果表明:洋山港海域含沙量存在着明显的季节变化;潮差越大,水体紊动越强,水体含沙量越高;洋山港水域含沙量明显高于其周围的水域,特别是在大小洋山岛链之间,呈现由北向南、由东向西逐渐增大的趋势;"峡岛效应"也是引起高含沙量一个重要原因;长江入海泥沙直接扩散对洋山港水体含沙量的影响较小,研究区域水体含沙量的大小主要取决于波况及潮流对当地浅滩的掀扬及输送.  相似文献   

海上风电倒Y形导管架筒型基础受力特性研究          下载免费PDF全文

王海军  唐贝  练继建  刘维斌  谭志辉  张永旭 《海洋工程》2022,40(4):112-120

以一6.7 MW风机为研究对象，提出了一种适用于30~50 m水深的海上风电倒Y形导管架筒型基础结构型式，采用三维精细有限元模型对结构的受力特性展开研究，包括结构的自振特性以及在随机风浪流荷载作用下的动力响应。研究结果表明，倒Y形导管架筒型基础采用“三腿变六腿”导管架的结构型式，能够更加有效的将上部荷载传递至下部筒型基础，具有较好的受力特性和传力体系；整机结构的前两阶自振频率均在风机允许运行的频率范围内；在50年一遇极端随机风浪流荷载作用下，整机结构的位移响应和应力响应，均可满足结构安全使用要求。  相似文献   

深水港与江苏海洋经济探讨——以洋口港为例   总被引：1，自引：0，他引：1  

于文金  朱大奎 《海岸工程》2009,28(1):63-71

从江苏海洋经济发展现状入手，分析了江苏海洋经济的特点、存在问题和发展瓶颈。基于江苏海洋经济和深水港口的现状，重点阐述了洋口港在江苏海洋经济中的地位和作用，提出洋口港是苏北海岸发展重要的支点，江苏海洋经济的希望在于深水大港以及由此带动发展起来的港区工业和海港中心城市，提出了“一核三载体”的海洋发展战略。  相似文献   

Reliability-Based Load and Resistance Factors Design for Offshore Jacket Platforms in the Bohai Bay: Calibration on Design Factors     

金伟良  胡琦忠  沈照伟  时忠民 《海洋工程》2009,(3):387-398

For the fulfillment of the probability-based structural design for the offshore jacket platforms in the Bohai Bay, the design factors of loads, resistance and load combinations are much necessary to be calibrated according to the proposed target reliability index. Firstly, the limit states function for the offshore jacket platforms is introduced. Then, four approaches to calibrate the factors of load and resistance are presented and compared. Afterwards, the methods to calibrate the load combination factors are developed. Finally, the factors of load, resistance and load combination for the offshore jacket platforms in the Bohai Bay are calibrated and the corresponding design formulae are recommended. The results are proved to be rational in practice, and also illustrate that the proposed target reliability index for offshore jacket platforms in the Bohai Bay is also appropriate.  相似文献