Measurements of attenuation from vertical seismic profiles
Measurements of attenuation from vertical seismic profiles
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DOI：
10.1190/1.1441161
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发表时间：
1981-11
期刊：
影响因子：
3.3
通讯作者：
P. S. Hauge
中科院分区：
文献类型：
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作者：
P. S. Hauge
衰减值是从五次详细的速度测量中提取的。在所有五口井中都观察到了显著的衰减。衰减值的测量值变化了10倍，范围从小于0.1到0.9分贝/波长。考虑到测量的分辨率限制，衰减与岩性的相关性很好。其中一项调查是在德克萨斯州西部进行的，另外四项调查是在墨西哥湾沿岸地区进行的。每次调查的总记录深度从31到208个不等，在关键地层区域每10或20英尺进行一次井下记录。在所有五次调查中，都在油井附近放置了一台监测地震检波器，以检查震源的一致性。我们测量衰减的程序包括构建每个井下脉冲和一个特定参考脉冲之间的光谱比率。然后从每个频谱比率中提取累积衰减值(CA)，并将其绘制为检波器深度的函数。这种方法使我们可以使用许多方法……
Values of attenuation have been extracted from five detailed velocity surveys. Significant amounts of attenuation are observed in all five wells. Measured values of attenuation vary by a factor of 10, ranging from less than 0.1 to 0.9 dB/wavelength. Correlation of attenuation with lithology is good, considering the resolution limits of the surveys. One of the surveys was performed in West Texas, and the other four were carried out in the Gulf Coast area. The total number of recording depths in each survey varied from 31 to 208, with downhole recordings taken every 10 or 20 ft over key stratigraphic zones. In all five surveys, a monitor geophone was placed near the well to check for source consistency. Our procedure for measuring attenuation involved constructing the spectral ratio between each downhole pulse and one particular reference pulse. A value of cumulative attenuation (CA) was then extracted from each spectral ratio and plotted as a function of geophone depth. This method allowed us to use many m...