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深水区地震资料处理变参数振幅恢复技术 被引量:1
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作者 陈殿远 刘仕友 孙万元 《天然气工业》 EI CAS CSCD 北大核心 2020年第12期41-51,共11页
在深水油气勘探中,海水水体的声学物理特征直接影响到后续地震资料处理及地球物理技术应用的效果。为了解决该类区域地震资料的保幅性问题,采用深水机器人、海水实验室测量及深水VSP等多种方法定量测量了地震波在海水中的速度(以下简称... 在深水油气勘探中,海水水体的声学物理特征直接影响到后续地震资料处理及地球物理技术应用的效果。为了解决该类区域地震资料的保幅性问题,采用深水机器人、海水实验室测量及深水VSP等多种方法定量测量了地震波在海水中的速度(以下简称海水速度),明确了海水速度具有明显的分层特征并建立了分层模型;进而基于地震波在海水、地层中振幅的衰减差异,提出了变参数振幅恢复技术,有效解决了浅水—坡折带—深水区域地震资料的保幅性问题。研究结果表明:①海水和地层的振幅衰减规律存在着巨大的差异,地震波传播相同的距离,其在海水中的振幅衰减比在地层中要弱很多;②较之于常数海水速度偏移剖面,层状海水速度偏移效果具有同相轴更为连续、信噪比更高的优点,提高了整体成像分辨率与成像精度;③在偏移距方向,近、中、远偏移距的地震振幅变化更加合理,避免了远偏移距的强振幅异常现象,使AVO属性更加合理。结论认为:①准确利用海水分层速度特征,可以使变水深区域地震成像质量得到明显的改善;②在琼东南盆地陵水深水区实际地震资料处理中,变参数振幅恢复技术获得的振幅更加均衡,同一反射地层可以被连续追踪;③该项研究成果可以为后续的储层预测和烃类检测奠定基础。 展开更多
关键词 深水油气勘探 坡折带 地震资料处理 水体声学 物理特征 海水分层 衰减差异 变参数振幅恢复 AVO
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海中噪声的研究及应用
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作者 大海 《国外科技消息》 1991年第5期3-4,共2页
关键词 水体声学 水下噪声 海水噪声
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Investigation of acoustic scale effects and boundary effects for the similitude model of underwater complex shell-structure 被引量:3
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作者 WANG San-de YANG De-sen LIU Ning 《Journal of Marine Science and Application》 2007年第1期31-35,共5页
In this paper, the acoustic scale effects and boundary effects for the similitude model of underwater complex shell-structure are investigated. The similitude conditions and relations between the similitude model and ... In this paper, the acoustic scale effects and boundary effects for the similitude model of underwater complex shell-structure are investigated. The similitude conditions and relations between the similitude model and its prototype were studied in the references. This paper investigates the acoustic scale effects for the similitude model, which are influenced by loss factor, shear and rotatory inertia. At the same time, the boundary effects which are influenced by surface sound reflection are investigated in the experiment of similitude model. The results show that the acoustic scale effects may be controlled with model designing, the boundary effects can be controlled with experimental designing between the similitude model and its prototype. 展开更多
关键词 acoustic scale effects acoustic boundary effects SIMILITUDE
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Multi-agent immune recognition of water mine model
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作者 LIU Hai-bo GU Guo-chang +1 位作者 SHEN Jing FU Yan 《Journal of Marine Science and Application》 2005年第2期44-49,共6页
It is necessary for mine countermeasure systems to recognise the model of a water mine before destroying because the destroying measures to be taken must be determined according to mine model. In this paper, an immune... It is necessary for mine countermeasure systems to recognise the model of a water mine before destroying because the destroying measures to be taken must be determined according to mine model. In this paper, an immune neural network (INN) along with water mine model recognition system based on multi-agent system is proposed. A modified clonal selection algorithm for constructing such an INN is presented based on clonal selection principle. The INN is a two-layer Boolean network whose number of outputs is adaptable according to the task and the affinity threshold. Adjusting the affinity threshold can easily control different recognition precision, and the affinity threshold also can control the capability of noise tolerance. 展开更多
关键词 multi-agent system immune neural network clonal selection pattern recognition water mine model
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水声学中的信号处理 被引量:2
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作者 李启虎 《物理》 CAS 北大核心 1992年第11期678-682,共5页
综述了水声学及水声信号处理的历史发展概况及它们在军事及民用方面的重要作用,介绍了与水声信号处理有关的换能器、布阵理论、波束成形理论、卡尔曼滤波、自适应滤波、目标识别、专家系统等课题,同时介绍水声信号处理中的一些现代技... 综述了水声学及水声信号处理的历史发展概况及它们在军事及民用方面的重要作用,介绍了与水声信号处理有关的换能器、布阵理论、波束成形理论、卡尔曼滤波、自适应滤波、目标识别、专家系统等课题,同时介绍水声信号处理中的一些现代技术,如 FFT,Zoom FFT,LOPAR,DEMON及高分辨力谱分析的基本知识. 展开更多
关键词 水体声学 水声信号 信息处理
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海底流体逃逸活动的地球物理响应特征 被引量:4
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作者 段旻良 童思友 +5 位作者 陈江欣 徐华宁 韩同刚 刘斌 杨力 张菲菲 《地球物理学进展》 CSCD 北大核心 2019年第5期2002-2015,共14页
海底流体逃逸活动对海洋油气勘探、天然气水合物勘查和试采、海底固体矿产勘探与全球气候变化研究等方面具有重要意义.理解海底流体逃逸活动规律,研究流体逃逸活动演化过程,并建立综合探测体系显得尤为重要.本文系统梳理了海底流体逃逸... 海底流体逃逸活动对海洋油气勘探、天然气水合物勘查和试采、海底固体矿产勘探与全球气候变化研究等方面具有重要意义.理解海底流体逃逸活动规律,研究流体逃逸活动演化过程,并建立综合探测体系显得尤为重要.本文系统梳理了海底流体逃逸活动在海底可视技术、综合声学水体成像技术、"磁亮点"技术以及卫星遥感技术等相关探测方法下的不同地球物理响应.分析认为,海底流体逃逸活动容易改变海底地层的物理性质和形态,在地震剖面和声学图像上表现为独特的流体异常反射特征和声学响应;烃渗漏形成烃蚀变带,在航磁图像上表现为弱磁异常;渗漏油膜在SAR卫星图像上表现为黑色斑块;天然地震控制下的断裂带流体逃逸活动在临震时震中附近在热红外图像上表现为亮温异常.结合不同探测方法的探测效率和优势特征,提出了利用卫星遥感和"磁亮点"等方法进行平面约束预测,用剖面或立体声学水体成像数据进行海底流体活动确认,再通过海底可视数据进行精细探测的综合地球物理探测方法,为深入研究海底流体活动系统理论提供参考,同时指出流体逃逸活动研究的相关方向. 展开更多
关键词 海底流体活动 磁亮点 遥感 声学水体成像 流体逃逸
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Influence of Separated Vortex on Aerodynamic Noise of an Airfoil Blade 被引量:2
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作者 Soichi Sasaki Hajime Takamatsu +2 位作者 Masao Tsujino Haruhiro Tsubota Hidechito Hayashi 《Journal of Thermal Science》 SCIE EI CAS CSCD 2010年第1期60-66,共7页
In order to clarify the mechanism by which aerodynamic noise is generated from separated flow around an airfoil blade,the relation between the attack angle and the aerodynamic noise of the blade was analyzed using a w... In order to clarify the mechanism by which aerodynamic noise is generated from separated flow around an airfoil blade,the relation between the attack angle and the aerodynamic noise of the blade was analyzed using a wind tunnel experiment and a CFD code.In the case of rear surface separation,the separated vortex which has a large-scale structure in the direction of the blade chord is transformed into a structure that concentrates at the trailing edge with an increase in the attack angle.The aerodynamic noise level then becomes small according to the vortex scale in the blade chord.When the flow is separated at the leading edge,a separated vortex of low pressure is formed at the vicinity of the trailing edge.The pressure fluctuations on the blade surface at the vicinity of the trailing edge become large due to the vortex in the wake.It is considered that the aerodynamic noise level increases when the flow is separated at the leading edge because the separated vortex is causing the fluctuations due to wake vortex shedding. 展开更多
关键词 VORTEX Aerodynamic Noise Shear Flow SEPARATION AIRFOIL
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