| 南海东沙海域天然气水合物地震数据多次压制及速度特征 |
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| 引用本文： | 徐华宁,梁蓓雯,吴能友.南海东沙海域天然气水合物地震数据多次压制及速度特征[J].地质通报,2006(Z2). |
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| 作者姓名： | 徐华宁 梁蓓雯 吴能友 |
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| 作者单位： | 国土资源部广州海洋地质调查局 广东广州510760 |
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| 基金项目： | 国家“863”计划项目《天然气水合物探测技术》(2001AA611020)资助。 |
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| 摘 要： | 多次波衰减是海洋地震数据处理中的一个关键问题。东沙海域多次波极其发育,由于地形的急剧变化和地质条件的影响,多次波变形严重(不符合双曲线规律)。采用常规的处理方法效果并不明显,并可能造成成果剖面上出现明显的多次压制痕迹,很难达到保幅处理。针对此区多次波的特点,提出一种频率分离的方法将数据分离后再进行不同处理,可以很好地解决多次波的压制并突出有效波;在没有有效反射的位置,剖面的背景噪音也更符合视觉习惯;更重要的是,处理中没有频率损失,处理结果更和谐。另外,叠前偏移处理技术的运用可以使含水合物地层的接触关系、反射特征更清楚。叠前时间偏移所建立的速度模型也能够表现含水合物地层、BSR与含游离气层的相对速度关系。
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| 关 键 词： | 东沙海域 水合物 多次波 频率分离 似海底反射 叠前时间偏移 |
Multiple attenuation and velocity field characteristics of seismic data of gas hydrates in the Dongsha sea area,South China Sea |
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| XU Hua-ning,LIANG Bei-wen,WU Neng-you Guangzhou Marine Geological Survey,Guangzhou ,Guangdong,China.Multiple attenuation and velocity field characteristics of seismic data of gas hydrates in the Dongsha sea area,South China Sea[J].Geologcal Bulletin OF China,2006(Z2). |
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| Authors: | XU Hua-ning LIANG Bei-wen WU Neng-you Guangzhou Marine Geological Survey Guangzhou Guangdong China |
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| Institution: | XU Hua-ning,LIANG Bei-wen,WU Neng-you Guangzhou Marine Geological Survey,Guangzhou 510760,Guangdong,China |
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| Abstract: | Multiples attenuation is one of the most important problems in marine seismic data processing. In the Dongsha sea area, multiples are very strong and their waveform is seriously distorted (non-hyperbola) because of the sharp change of the terrain and geological complexity, which makes the conventional methods invalid and produces distinct marks of multiple attenuations at the section. According to the characteristics of the multiples, the paper proposes a method of frequency separation,which is effective in non-hyperbolic multiple attenuation. Moreover, the application of the method can highlight the weak reflector and make the section harmonious when there is no valid reflector. More importantly, there is no frequency loss in the processing. Another important method is pre-stack time migration, which can make the reflection characteristic of BSR and strata distinguished. The velocity field obtained from pre-stack time migration can show the velocity anomaly of strata above and below the BSR. |
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| Keywords: | hydrate multiple frequency separation bottom simulating reflector pre-stack time migration Dongsha sea area |
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