Frequency-dependent seismic anisotropy due to fractures: Fluid flow versus scattering
Frequency-dependent seismic anisotropy due to fractures: Fluid flow versus scattering
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DOI：
10.1190/geo2012-0288.1
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发表时间：
2013-03
期刊：
影响因子：
3.3
通讯作者：
A. Baird;J. Kendall;D. Angus
中科院分区：
文献类型：
--
作者：
A. Baird;J. Kendall;D. Angus
各向异性是一种有用的属性，用于检测和表征油气藏中的定向裂缝组。不幸的是，许多传统的有效介质理论用于模拟裂缝岩石的地震特性是不敏感的组成裂缝的大小。例如，相同的各向异性图案可以由高浓度的小的刚性裂纹或由较低浓度的大的顺应性裂缝产生。这些模型之间的区别对于评估渗透率各向异性很重要，因为流体流动由最大的裂缝主导。获得进一步认识的一种方法是通过分析微地震数据中的频率相关剪切波分裂，因为裂缝柔度是频率相关的，并且微地震数据的频率含量相对丰富。本文比较了引起裂缝频率依赖性柔度的两种可能机制：（1）裂缝中的喷流和（2）裂缝中的波散射。
ABSTRACTAnisotropy is a useful attribute for the detection and characterization of aligned fracture sets in petroleum reservoirs. Unfortunately, many of the traditional effective medium theories for modeling the seismic properties of fractured rock are insensitive to the size of the constituent fractures. For example, the same pattern of anisotropy may be produced by a high concentration of small, stiff cracks or by a lower concentration of large, compliant fractures. The distinction between these models is important for assessing permeability anisotropy because fluid flow is dominated by the largest fractures. One method to gain further insight is through the analysis of frequency-dependent shear-wave splitting in microseismic data because fracture compliance is frequency dependent, and microseismic data are relatively rich in frequency content. We compared two potential mechanisms causing frequency-dependent compliance of fractures: (1) squirt flow in fractured porous rock and (2) wave scattering over r...