摘要
地层吸收衰减是高分辨率地震勘探面临的一大难题。品质因子Q是描述岩石弹性性质的重要参数之一,也是地层含油气性的重要标志,谱比法是实际运用中最为广泛的Q值估计方法。这里详细阐述了谱比法的基本原理,结合最小二乘拟合方法,使用雷克子波作为地震子波,从建立的理论地质模型中提取品质因子Q值,并分析了层厚度、噪声、时窗长度、拟合频带范围等因素对谱比法应用效果的影响。多层模型分析结果和实际地震资料含油气检测证明,谱比法能有效估计Q值变化情况,并能与实际钻井结果相吻合,因此运用谱比法可作为一种有效含油气检测方法。
Stratigraphic absorption and attenuation is a big problem for high resolution seismic exploration.The quality factor Qis one of the most important parameters to describe the elastic properties of rocks,and it also an important symbol of oil-bearing formation.Spectral ratio method is the most widely used method for Qestimation.This paper describes the basic principle of spectral ratio method.Using Ricker wave as seismic wavelet,and combined with the least square principle to calculate the quality factor Qfrom the geological model.And analyzed the layer thickness,noise,time window length,frequency band and other factors on the application effect of the spectral ratio method.Multilayer model analysis combined with seismic data of hydrocarbon detection proved that spectral ratio method can effectively estimate Q.Therefore,the spectral ratio method can be used as an effective hydrocarbon detection factor.
出处
《物探化探计算技术》
CAS
CSCD
2016年第2期225-231,共7页
Computing Techniques For Geophysical and Geochemical Exploration
基金
国家自然科学基金(41204091)
关键词
品质因子
谱比法
影响因素
quality factor
spectral ratio method
influence factors
