Time reverse modeling of low‐frequency microtremors: Application to hydrocarbon reservoir localization
Time reverse modeling of low‐frequency microtremors: Application to hydrocarbon reservoir localization
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DOI：
10.1029/2007gl032097
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发表时间：
2008-02
影响因子：
5.2
通讯作者：
B. Steiner;E. Saenger;S. Schmalholz
中科院分区：
文献类型：
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作者：
B. Steiner;E. Saenger;S. Schmalholz
时间反演建模适用于使用同步地震仪在地球表面测量的合成和真实低频微震。与以前的时间反演应用相比，微震定位没有应用单个事件或首次到达时间识别。合成低频微震在较小的地下区域内以数值方式生成，并使用模拟二维弹性波传播的有限差分算法进行建模。使用合成微震的时间反演模型表明，可以准确定位小型地下震源区域。主要发射P波或S波的不同源特性垂直影响定位精度。将时间反演建模应用于奥地利 Voitsdorf 附近已知油藏上方相隔 16 个月采集的两个真实微动数据集，以研究在油藏上方观察到的频谱异常是否源自油藏。时间反演模型表明低频微震信号源自储层位置，为储层定位提供了一种可能的方法。
Time reverse modeling is applied to synthetic and real low‐frequency microtremors measured at the Earth surface with synchronized seismometers. In contrast to previous time‐reverse applications, no single event or first arrival time identification is applied for microtremor localization. Synthetic low‐frequency microtremors are numerically generated within a small underground area and modeled with a finite‐difference algorithm simulating two‐dimensional elastic wave propagation. Time reverse modeling using synthetic microtremors shows that small underground source areas can be accurately located. Different source characteristics which emit mainly P‐waves or S‐waves vertically influence the localization accuracy. Time reverse modeling is applied to two real microtremor data sets acquired 16 months apart above known oil reservoirs nearby Voitsdorf, Austria, to investigate whether spectral anomalies observed above the reservoirs originate from the reservoirs. Time reverse modeling indicates that low‐frequency microtremor signals originate from the reservoir locations and provides a possible method for reservoir localization.