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首页> 外文期刊>Pure and Applied Geophysics >Interpretation of Microseismicity Resulting from Gel and Water Fracturing of Tight Gas Reservoirs
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Interpretation of Microseismicity Resulting from Gel and Water Fracturing of Tight Gas Reservoirs

机译：致密气藏的凝胶和水压裂引起的微震解释

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摘要

We provide a comparative analysis of the spatio-temporal dynamics of hydraulic fracturing-induced microseismicity resulting from gel and water treatments. We show that the growth of a hydraulic fracture and its corresponding microseismic event cloud can be described by a model which combines geometry- and diffusion-controlled processes. It allows estimation of important parameters of fracture and reservoir from microseismic data, and contributes to a better understanding of related physical processes. We further develop an approach based on this model and apply it to data from hydraulic fracturing experiments in the Cotton Valley tight gas reservoir. The treatments were performed with different parameters such as the type of treatment fluid, the injection flow rate, the total volume of fluid and of proppant. In case of a gel-based fracturing, the spatio-temporal evolution of induced microseismicity shows signatures of fracture volume growth, fracturing fluid loss, as well as diffusion of the injection pressure. In contrast, in a water-based fracturing the volume creation growth and the diffusion controlled growth are not clearly separated from each other in the space-time diagram of the induced event cloud. Still, using the approach presented here, the interpretation of induced seismicity for the gel and the water treatments resulted in similar estimates of geometrical characteristics of the fractures and hydraulic properties of the reservoir. The observed difference in the permeability of the particular hydraulic fractures is probably caused by the different volume of pumped proppant.
机译：我们提供了凝胶和水处理引起的水力压裂引起的微地震时空动态的对比分析。我们表明，水力压裂及其相应的微地震事件云的增长可以通过结合几何控制和扩散控制过程的模型来描述。它允许从微地震数据估计裂缝和储层的重要参数，并有助于更好地理解相关的物理过程。我们进一步开发了基于此模型的方法，并将其应用于棉谷致密气藏的水力压裂实验数据。用不同的参数进行处理，例如处理液的类型，注入流速，流体和支撑剂的总体积。在基于凝胶的压裂的情况下，诱导的微震的时空演化表现出裂缝体积增长，压裂液损失以及注入压力扩散的特征。相反，在水基压裂中，在诱发事件云的时空图中，体积生成的增长和扩散控制的增长没有清楚地彼此分开。仍然，使用这里介绍的方法，对凝胶和水处理引起的地震活动的解释导致对裂缝的几何特征和储层水力特性的相似估计。观察到的特定水力压裂渗透率的差异可能是由于泵送支撑剂的体积不同所致。

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