Seismic wave attenuation and dispersion induced by fluid flow within various cracks and a small amount of bubbly fluid
Seismic wave attenuation and dispersion induced by fluid flow within various cracks and a small amount of bubbly fluid
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DOI：
10.4401/ag-8257
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发表时间：
2020-07
影响因子：
1
通讯作者：
Yu Chen;Z. Zong;Chongpeng Huang;Shuangshuang Zhang
中科院分区：
文献类型：
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作者：
Yu Chen;Z. Zong;Chongpeng Huang;Shuangshuang Zhang
油气藏通常含有孔隙和各种裂缝，其中可能含有少量的气泡流体。本文从基本多孔介质的波动理论出发，首先研究了各种因素对流体压力的影响，然后利用应力-应变关系和带耗散函数的拉格朗日方程，初步推导了含各种裂纹和少量气泡流体的多孔介质的弹性波动方程。该弹性波方程有效地描述了各种裂缝诱发的喷流对地震波衰减和频散的影响，以及气泡线性振动对地震波衰减和频散的影响。然后，估计给定模型的地震波衰减和频散，获得不同频段岩石物理参数的匹配。数值计算结果表明，该方法与以往流体流动引起的地震波衰减和频散机理的理论是一致的，能够更好地描述实际岩石介质中弹性波的传播，特别是对于各种裂隙内流体流动和少量气泡流体引起的地震波衰减和频散机理。
Hydrocarbon reservoirs usually contain pores and various cracks, which may contain a small amount of bubble fluid. In this study, based on the wave theory of basic porous medium, the influence of various factors on fluid pressure are investigated, and then the stress-strain relationship and Lagrange’s equations with a dissipation function is utilized to derive the elastic wave equation of porous medium containing various cracks and a small amount of bubbly fluid initially. This elastic wave equation describes the influence of squirt flow induced by various cracks on seismic wave attenuation and dispersion, and the influence of the bubble linear vibration on seismic wave attenuation and dispersion effectively. Then, the seismic wave attenuation and dispersion of a given model is estimated and the matching of rock physics parameters are obtained in different frequency bands. The numerical results illustrate that the proposed approach is compatible with previous theory to explain the mechanics of the seismic wave attenuation and dispersion induced by fluid flow and can better describe the propagation of elastic waves in actual rock medium especially for the mechanics of the seismic wave attenuation and dispersion induced by fluid flow within various cracks and a small amount of bubble fluid.