摘要
与常规反Q滤波方法相比,反Q偏移理论上可实现严格按波场传播路径对介质非弹性吸收频散效应予以补偿与校正。控制高频振幅补偿不稳定性的方法有两种——增益截频法和稳定因子法。结合增益截频法和稳定因子法,并考虑到偏移假频压制问题,提出了一种新的振幅增益控制方法,即利用稳定因子计算增益截频,并在波场深度延拓过程中利用计算出的增益截频来保证振幅控制的合理性。讨论了叠后偏移、双平方根算子和单平方根算子叠前偏移中吸收衰减和频散补偿的实现方法。数值试验结果证明了所提方法的有效性。
Theoretically,inverse Q migration can compensate the attenuation and dispersion caused by the non-elasticity of subsurface medium, strictly along the wavepath.But the stability of amplitude compensation in inverse Q migration limits the amplitude compensation on high-frequency components.Conventional methods for controlling the instability of amplitude compensation on high-frequency components include gain-limited high-cut frequency method and stable factor method.By combining the two methods,and considering the alias suppressing in migration,a new approach for controlling the amplitude gain was proposed.Stable factor is utilized to compute gain-limited high-cut frequency,and then the computed gain-limited high-cut frequency is used to guarantee the rationality of amplitude control during wave field depth continuation.Finally, we discussed the concrete realization implementation for the compensation of attenuation and dispersion during poststack migration, as well as prestack migration with double-square-root operator or single-square-root operator.Numerical tests proved the feasibility of the method.
出处
《石油物探》
EI
CSCD
北大核心
2010年第2期115-120,共6页
Geophysical Prospecting For Petroleum
基金
国家重点基础研究发展计划(973)项目(2006CB202402)
国家高技术研究发展计划(863)项目(2006AA09Z323)
国家科技重大专项(2008ZX05005-005-HZ007)共同资助
关键词
反Q偏移
振幅补偿稳定性
增益截频
稳定因子
inverse Q migration
stability of amplitude compensation
gain-limited high-cut frequency
stable factor
