Reflection technique in time‐frequency domain using multicomponent acoustic emission signals and application to geothermal reservoirs
Reflection technique in time‐frequency domain using multicomponent acoustic emission signals and application to geothermal reservoirs
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DOI：
10.1190/1.1484535
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发表时间：
2002-05
期刊：
影响因子：
3.3
通讯作者：
N. Soma;H. Niitsuma;R. Baria
中科院分区：
文献类型：
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作者：
N. Soma;H. Niitsuma;R. Baria
我们开发了一种利用声发射信号作为源来估计深层地热储层结构的反射技术，当由于高温、高压和深度大而没有适当的估计技术时，该技术非常有用。由于其分辨率不够高，无法与测井等方法进行比较，因此我们通过使用小波变换开发多分量声发射信号的时频域分析来增强该技术。通过分析 3D 均线图的形状，将反射波与非相干尾波分开：线性形状表示相干信号（例如反射波）的到达，非相干信号（例如尾波）呈现球形。我们使用小波变换构建 3D 粒子运动的谱矩阵，就像在时频域中所做的那样。我们通过使用谱矩阵的特征值来评估每个时间和频率的 3-D hodogram 的线性度。三维反演...
We have developed a reflection technique for estimating deep geothermal reservoir structures using acoustic emission signals as a source, which is useful when there is no proper estimating technique because of high temperature, high pressure, and great depth. Because its resolution is not high enough for comparison with methods such as well logging, we have enhanced the technique by developing a time–frequency‐domain analysis of multicomponent acoustic emission signals using a wavelet transform. The reflected wave is separated from an incoherent coda by analyzing the shape of a 3‐D hodogram: a linear shape indicates the arrival of a coherent signal such as a reflected wave, and an incoherent signal such as a coda makes a spherical shape. We construct a spectral matrix of 3‐D particle motion using a wavelet transform, as is done in a time–frequency domain. We evaluate the linearity of the 3‐D hodogram for each time and frequency by using the eigenvalues of the spectral matrix. Three‐dimensional inversion o...