A model for strong attenuation and dispersion of seismic P-waves in a partially saturated fractured reservoir
A model for strong attenuation and dispersion of seismic P-waves in a partially saturated fractured reservoir
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DOI：
10.1007/s11433-010-3205-0
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发表时间：
2010-05
期刊：
影响因子：
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通讯作者：
M. Brajanovski;Tobias Malte Müller;J. Parra
中科院分区：
文献类型：
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作者：
M. Brajanovski;Tobias Malte Müller;J. Parra
在这项工作中，我们解释的数据显示异常强烈的速度色散的P波（高达30%）和衰减在一个相对较窄的频率范围。在志留系坎卡基石灰岩地层的孔隙带中测量了一个储层的井间和VSP数据，该储层是由被油和气块饱和的多孔基质内的垂直裂缝形成的。这种介质表现出显着的衰减，由于波引起的流体流动之间的界面不同类型的夹杂物（裂缝，流体补丁）和背景。其他固有衰减模型（特别是喷射流模型）无法解释使用实际岩石特性时观察到的色散量。为了对资料进行满意的解释，我们建立了一个考虑斑片饱和度效应的裂隙孔隙岩石叠加模型。
In this work we interpret the data showing unusually strong velocity dispersion of P-waves (up to 30%) and attenuation in a relatively narrow frequency range. The cross-hole and VSP data were measured in a reservoir, which is in the porous zone of the Silurian Kankakee Limestone Formation formed by vertical fractures within a porous matrix saturated by oil, and gas patches. Such a medium exhibits significant attenuation due to wave-induced fluid flow across the interfaces between different types of inclusions (fractures, fluid patches) and background. Other models of intrinsic attenuation (in particular squirt flow models) cannot explain the amount of observed dispersion when using realistic rock properties. In order to interpret data in a satisfactory way we develop a superposition model for fractured porous rocks accounting also for the patchy saturation effect.