Do seismic waves sense fracture connectivity?
Do seismic waves sense fracture connectivity?
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DOI：
10.1002/grl.50127
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发表时间：
2013-02
影响因子：
5.2
通讯作者：
J. Rubino;L. Guarracino;Tobias Malte Müller;K. Holliger
中科院分区：
文献类型：
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作者：
J. Rubino;L. Guarracino;Tobias Malte Müller;K. Holliger
裂缝性岩石的一个决定性特征是它们具有非常高的地震衰减水平，迄今为止，人们一直认为这主要是由于裂缝和嵌入基质孔隙空间之间的波致流体流动（WIFF）。利用基于准静态孔隙弹性方程的振荡压缩性模拟，我们发现了另一个重要的、尚未被记录的WIFF在裂缝连通性下的表现。这种额外的能量损失主要是由于连接裂缝内的流体流动，并且对裂缝的长度、渗透率和相交角度很敏感。相应地，它包含了裂隙岩体控制水力特性的关键信息，因此在需要这种介质的真实地震模型时，应该考虑到这一点。
A defining characteristic of fractured rocks is their very high level of seismic attenuation, which so far has been assumed to be mainly due to wave‐induced fluid flow (WIFF) between the fractures and the pore space of the embedding matrix. Using oscillatory compressibility simulations based on the quasi‐static poroelastic equations, we show that another important, and as of yet undocumented, manifestation of WIFF is at play in the presence of fracture connectivity. This additional energy loss is predominantly due to fluid flow within the connected fractures and is sensitive to their lengths, permeabilities, and intersection angles. Correspondingly, it contains key information on the governing hydraulic properties of fractured rock masses and hence should be accounted for whenever realistic seismic models of such media are needed.