利用零偏VSP直达波提取品质因子方法研究  

Quality factors estimation from direct waves in zero offset vertical seismic profile

作　　者：汪云家[1] 

机构地区：[1]中国石化股份胜利油田分公司科技处,山东东营257001

出　　处：《油气地质与采收率》2010年第3期54-56,共3页Petroleum Geology and Recovery Efficiency

基　　金：国家"863"计划资助项目"多尺度地球物理资料井地联合反演技术"(2007AA060504)

摘　　要：地层对地震波的衰减性质通常用品质因子来度量。针对零偏VSP资料的特点,利用其不同传播距离的直达波信息,采用频谱比值方法进行品质因子的提取,并分析了信噪比对品质因子提取结果的影响。地震资料噪音水平越高,可以利用的频谱比值计算范围越小,计算误差越大。对理想子波和实际模型零偏VSP资料的处理结果表明了该方法的有效性和可靠性。利用垦71-检41井零偏VSP资料求取了品质因子随深度的变化,结果与对应的地层性质吻合较好,并且随着深度的增加,品质因子提取的可靠性逐渐增强。这为利用品质因子研究储层性质以及进行反Q滤波提高地震资料分辨率提供了基础参数。The Attenuation of seismic wave propagating in formation can be characterized by quality factors Q.Based on the characters of zero offset vertical seismic profile,the average Q is estimated from the direct waves by using the spectrum ratio method,and the effect of signal to noise ratio to Q estimation is analyzed.The results of the Q estimation from the theoretical wavelet and the zero offset vertical seismic profile of the forward model show the reliability.The Q of the formation is estimated from the zero offset vertical seismic profile of Jian41 well by means of spectrum ratio method,which provides the practical method to study the attenuation of formation and to enhance the resolving power of surface seismic data utilizing the inverse Q filter.

关 键 词：品质因子 零偏VSP 频谱比值法 直达波 信噪比 

分 类 号：P631.44[天文地球—地质矿产勘探]