| 六种岩性海底地震波透射能量AVA特征研究 |
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| 引用本文： | 杨正华,朱光明,袁伟.六种岩性海底地震波透射能量AVA特征研究[J].石油地球物理勘探,2011(4):501-505,667,491. |
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| 作者姓名： | 杨正华 朱光明 袁伟 |
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| 作者单位： | 长安大学地测学院地球物理系; |
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| 摘 要： | 海上地震勘探中的海底透射波能量分布特征影响勘探方案设计和数据处理。针对此问题,基于流—固界面反射和透射系数及能量方程等理论,探讨了淤泥、凝灰岩、粉砂岩、粗砂岩、石灰岩和花岗岩等六种岩性海底的透射波能量随入射角的变化特征。研究结果表明,随着入射角变化,不同岩性海底的透射波能量分布差异很大:①淤泥,小于临界角(49°)时有利于透射纵波勘探,大于临界角时有利于透射转换波勘探;②凝灰岩,入射角≤65°时有利于透射纵波勘探,入射角在40°~80°范围时,有利于透射转换波勘探;③粉砂岩和粗砂岩,在小于临界角(分别为61°~55°)时,有利于透射纵波勘探;④石灰岩和花岗岩,透射纵波能量在小于第一临界角(分别约为14°和18°)时为10%~30%;透射横波在第一临界角(同上)和第二临界角(分别约为28°和34°)之间约为40%,大于第二临界角后透射波消失,故此类岩性不利于海上勘探。
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| 关 键 词： | AVA 地震勘探 海底岩性 临界角 流—固界面 地震波能量 |
A research on AVA characteristics of seismic transmission energy at seafloor of six lithologies |
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| Yang Zheng-hua,Zhu Guang-ming , Yuan Wei..A research on AVA characteristics of seismic transmission energy at seafloor of six lithologies[J].Oil Geophysical Prospecting,2011(4):501-505,667,491. |
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| Authors: | Yang Zheng-hua Zhu Guang-ming Yuan Wei |
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| Affiliation: | Yang Zheng-hua1,Zhu Guang-ming1 and Yuan Wei1.1.The Geophysics Department of Geology Engineering and Geomatics College,Chang'an University,Xi'an,Shanxi 710054,Chin |
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| Abstract: | Energy distribution of transmitted compression wave at seafloor has an influence upon exploration scheme design and data processing.As for this issue,this paper discusses variation characteristics of transmitted wave energy of 6 types of seafloor with different lithologies(silt,tuff,powder-grained sandstone,coarse-grained sandstone,limestone and granite) with respect to the incident angle,which is based on theories like coefficients of liquid-solid interface and energy function.The situations of transmitted... |
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| Keywords: | AVA seismic exploration seafloor lithology critical angle liquid-solid interface seismic wave energy |
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