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典型水深与海底介质条件下的OBC/OBN多分量地震数据波型特征

Wave modes of multi-component OBC/OBN data under typical water depth and bottom medium conditions

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  • 国家科技期刊平台
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海底电缆或海底节点(OBC/OBN)多分量地震是开展海上复杂油气藏勘探的重要手段之一.由于地震波与自由表面及海底界面的互相作用,海底多分量地震记录中波型成分十分复杂.调查其中各类信号与噪声的形成机制及其影响,可为后续数据处理与解释提供关键依据.针对海底多分量地震观测条件下潜在的波场信号,按照不同水深与典型海底沉积物性质构建代表性的弹性参数模型,利用谱元法合成OBC/OBN多分量地震记录,分析各类波型成分的表现特征,揭示水深和海底介质特性对波场运动学及动力学特征的影响.通过与东海浅水区和南海深水区海底地震仪(OBS)采集的实际地震数据的对比分析,确认了水深与海底介质条件对表面多次波与海底界面波的调控机理,为海底多分量地震数据处理方法研究与技术应用提供有益的指导.
Multi-component OBC(ocean bottom cable)and OBN(ocean bottom node)surveys are important techniques for off-shore exploration.Seismic waves travelling back and forth between free surface and the sea floor generate complicated wave modes in multi-component seismogram.How to understand the intrinsic mechanisms and influences of various signals and noises is crucial to data processing and interpretation.In view of various potential wave fields in offshore multi-component seismic data,we estab-lish elastic parameter models in accordance with different water depths and properties of typical sea-floor deposits and generate synthetic multi-component OBC/OBN records using the spectral element method.The influences of water depth and sea-floor me-dium properties on the kinematic and dynamic performance of wave fields are investigated in terms of the behavior of different wave modes.Based on the comparative analysis of OBS(ocean bottom seismograph)data acquired from a shallow-water zone in the East China Sea and deep-water zone in the South China Sea,we establish the controlling mechanism of free-surface multiples and sea-floor boundary waves by water depth and sea-floor medium properties,which may be helpful to the development and appli-cation of offshore multi-component data processing techniques.

offshore multi-component seismic datasea-floor interfacial effectP-S mode couplingfree-surface multiplesocean bot-tom seismometerOBC/OBN

王腾飞、刘学义、程玖兵

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同济大学海洋地质国家重点实验室,上海 200092

海底多分量地震 海底界面效应 P-S模式耦合 自由表面多次波 海底地震仪 OBC/OBN

国家自然科学基金国家自然科学基金上海市面上自然科学基金上海市面上自然科学基金

42204110420741574220411042074157

2024

10.12431/issn.1000-1441.2024.63.01.004

石油物探
中国石油化工股份有限公司石油物探技术研究院

石油物探

CSTPCD北大核心
影响因子：1.094
ISSN：1000-1441
年,卷(期)：2024.63(1)
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