Seismic interferometry using multidimensional deconvolution and crosscorrelation for crosswell seismic reflection data without borehole sources
Seismic interferometry using multidimensional deconvolution and crosscorrelation for crosswell seismic reflection data without borehole sources
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DOI：
10.1190/1.3511357
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发表时间：
2011-01-01
期刊：
影响因子：
3.3
通讯作者：
Wapenaar, Kees
中科院分区：
文献类型：
--
作者：
Minato, Shohei;Matsuoka, Toshifumi;Wapenaar, Kees
井间反射法是一种利用井间记录的高分辨率地震成像方法。对井下震源的需求是其应用的一个限制因素，例如在延时测量中。另一种方法是将面源与地震干涉测量结合使用。地震干涉法(SI)可以像从另一个井中的震源那样反演其中一个井的反射响应。我们利用数值模拟的野外数据，研究了SI在两个钻孔之间的反射响应反演中的适用性。我们比较了两种SI方法--互相关法(CC)和多维反卷积(MDD)。通过MDD的SI对源分布的欠照明不太敏感，但需要在来自所有可用源的接收器阵列之一处对记录进行反转。我们发现逆问题是不适定的，并提出用奇异值分解来稳定它。结果表明，无论是CC方法还是MDD方法，都能很好地反演深边界反射。此外，对于浅层边界的下行反射，MDD结果显示出比CC方法更真实的幅度。我们发现，用这两种方法对野外资料进行反演，其结果与井间地震反射资料和测井纵波速度吻合较好。
Crosswell reflection method is a high-resolution seismic imaging method that uses recordings between boreholes. The need for downhole sources is a restrictive factor in its application, for example, to time-lapse surveys. An alternative is to use surface sources in combination with seismic interferometry. Seismic interferometry (SI) could retrieve the reflection response at one of the boreholes as if from a source inside the other borehole. We investigate the applicability of SI for the retrieval of the reflection response between two boreholes using numerically modeled field data. We compare two SI approaches-crosscorrelation (CC) and multidimensional deconvolution (MDD). SI by MDD is less sensitive to underillumination from the source distribution, but requires inversion of the recordings at one of the receiver arrays from all the available sources. We find that the inversion problem is illposed, and propose to stabilize it using singular-value decomposition. The results show that the reflections from deep boundaries are retrieved very well using both the CC and MDD methods. Furthermore, the MDD results exhibit more realistic amplitudes than those from the CC method for downgoing reflections from shallow boundaries. We find that the results retrieved from the application of both methods to field data agree well with crosswell seismic-reflection data using borehole sources and with the logged P-wave velocity.