摘要
当地震波入射到地下时,地层介质中反射波和散射波同时存在,用单一的反射理论或散射理论来描述介质的空间结构都是不全面的。特别是结构十分复杂的浅表层介质具有强烈的不均匀性,是散射源的主要分布区域,采用散射波地震勘探技术来研究其波场特征更具合理性与针对性。工程勘查中目前应用的地震散射剖面法(SSP)以地震散射理论为基础,通过反射与散射的混合模型来解析地下空间结构,有利于提高浅表层小尺度离散地质体勘查资料的信噪比和分辨能力。SSP法在隧道路线方案比选工程勘查中的应用结果表明,在地表和地下复杂程度及震源能量基本相同的情况下,SSP资料的探测深度和信噪比均优于常规反射地震资料;工程钻探结果印证了SSP法所获信息的可靠性。散射波地震勘探技术在工程勘查应用中取得的研究成果,对油气地震勘探中低信噪比地区复杂近地表结构的精细地质调查具有现实的参考意义。
When the seismic wave enters underground,reflection and scattering wave coexist in the formations.It is not enough to describe the spatial structure by a single theory of either reflection or scattering theory.Complex shallow media has strong heterogeneity,which is the main distribution area of scattering source.Utilizing seismic scattering wave to study the characteristics of the wavefield is more reliable.Seismic scattering profile technique(SSP) in engineering investigation is based on scattering theory,which utilizes the hybrid model of reflection and scattering to resolve the structure of underground space.SSP can increase discrete shallow small scale geological prospecting information and improve the S/N & resolution of seismic data.The application of SSP method in tunnel sites survey revealed that the probing depth and S/N is superior to the conventional seismic reflection data.Drilling results confirmed the reliability of SSP result.The application results provide a reference for fine geologic survey at complex near-surface area with low S/N in hydrocarbon seismic exploration.
出处
《石油物探》
EI
CSCD
北大核心
2013年第1期43-48,5,共6页
Geophysical Prospecting For Petroleum
基金
江苏省科技发展计划工程技术研究中心建设项目(BM2011357)资助
关键词
散射波
浅表层结构
地震散射剖面法
散射成像
异常解析
scattering wave
shallow-surface structure
seismic scattering profile(SSP)
scattering wave imaging
anomaly interpretation
