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A Mori-Tanaka scheme-based model for gas-water two-phase cracked rocks and its application
Gas Science and Engineering ( IF 5.285 ) Pub Date : 2022-07-04 , DOI: 10.1016/j.jngse.2022.104690
Pu Wang , Yi-an Cui , Xinpeng Pan , Lei Li , Jianxin Liu , Wanrong Li

Microporous structure and pore fluid are two important components of poroelastic rocks that influence the variation of rock modulus. Cracks are special microstructures that are more likely to be compressed during wave propagation than stiff pores, resulting in squirt flow. In addition, the distribution of different fluids, such as water and gas, may be characterized by patchy saturation and generate fluid pressure gradients. By combining the Mori-Tanaka scheme and these two local fluid flows, a new rock physics model for gas-water two-phase cracked rocks is developed. Among effective medium models, the Mori–Tanaka model is of superiority in describing non-dilute-inclusion rocks and has an explicit expression. It is used to provide a reasonable variable range of the rock modulus. First, it is re-derived by assuming that the pore structure contains cracks and stiff pores. Then, the pore fluid pressures are investigated by considering the effects of squirt flow and patchy saturation simultaneously. The proposed model agrees well with the boundary models and is consistent with the variation of the experimental and well-logging data. With the new model, the joint effect of two different local fluid flows on rock moduli with frequency can be analyzed in detail.



中文翻译:

基于 Mori-Tanaka 格式的气水两相破裂岩石模型及其应用

微孔结构和孔隙流体是影响岩石模量变化的孔隙弹性岩石的两个重要组成部分。裂纹是一种特殊的微结构,在波传播过程中更容易被压缩比僵硬的毛孔,导致喷流。此外,不同流体(如水和气)的分布可能具有不均匀饱和的​​特征,并产生流体压力梯度。通过将 Mori-Tanaka 方案和这两种局部流体流动相结合,开发了一种新的气水两相破裂岩石的岩石物理模型。在有效介质模型中,Mori-Tanaka 模型在描述非稀包裹体岩石方面具有优势,具有明确的表达方式。它用于提供岩石模量的合理可变范围。首先,通过假设孔隙结构包含裂缝和硬孔隙来重新推导它。然后,同时考虑喷流和斑块饱和度的影响,研究了孔隙流体压力。所提出的模型与边界模型吻合良好,并且与实验和测井数据的变化一致。使用新模型,可以详细分析两种不同局部流体流动对岩石模量随频率的联合影响。

更新日期:2022-07-04
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