地质约束下的深水绕射多次波衰减技术

发布时间：2018-03-04 19:52

本文选题：地质约束　切入点：绕射多次波衰减　出处：《地球物理学进展》2017年01期 　论文类型：期刊论文

【摘要】：随着海洋勘探开发的深入,对深水地震资料品质要求越来越高.崎岖海底绕射多次波的压制和去除已成为当前深水陡坡带和复杂海底地震资料处理的重点和难点.当前海上单-窄方位采集观测方式下,由于崎岖海底产生的绕射多次波传播路径复杂、方向异变,二次反射源在自由表面的下行反射点位置常常位于排列方位之外,导致SRME技术无法准确有效预测和衰减崎岖海底下的绕射多次波.本文借鉴地表一致性处理思想,提出了一种基于地质统计约束下的绕射多次波衰减技术(GCDMA),通过地质信号的统计和建模分解实现对残余绕射多次波的判定和衰减,经实际资料测试处理取得了明显的应用效果,较好解决了深水陆坡崎岖海底下的绕射多次波衰减难题,极大提高了中深层地震资料品质.
[Abstract]:With the development of ocean exploration, The quality of seismic data in deep water is becoming more and more demanding. The suppression and removal of diffracted multiple waves in rugged seabed has become the focus and difficulty of seismic data processing in deep water steep slopes and complex seafloor at present. Under the current observation mode of single and narrow azimuth acquisition on the sea, Due to the complex propagation path of diffracted multiple waves produced by rugged seafloor and the different directions, the downlink reflection point of secondary reflection source on the free surface is often located outside the alignment azimuth. As a result, SRME can not accurately and effectively predict and attenuate diffraction multiple under rugged seafloor. In this paper, a technique of diffraction multiple attenuation based on geostatistical constraints is proposed. The residual diffraction multiple is judged and attenuated by statistical analysis and modeling decomposition of geological signals. The problem of attenuation of diffracted multiple waves under the rugged seabed of deep continental slope is well solved, and the quality of seismic data in middle and deep layers is greatly improved.
【作者单位】：中海油能源发展工程技术公司物探技术研究所;
【基金】：国家重大科技攻关项目十二五子课题:南海北部深水区潜在富生烃凹陷评价(2011ZX05025)资助
【分类号】：P631.46

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