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A novel experimental approach for fracability evaluation in tight-gas reservoirs

机译：致密气藏易碎性评估的新实验方法

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Hydraulic fracturing is an effective stimulation method for the economic development of tight-gas reservoirs in which extremely low matrix permeability requires complex fracture networks. Petrophysical/mechanical experiments and XRD/SEM analyses demonstrate that volcanic sedimentary rock is characterized by developed natural fracture, strong brittleness, stress sensitivity, AE activity, weak anisotropy, and fluid sensitivity. Fracability index is often utilized as a key parameter to evaluate the ability to generate fracture networks. In this study, a new systematic experimental approach and a new mathematical model are established for the comprehensive evaluation of the fracability of tight-gas formations. These two methods integrate natural fracture, stress sensitivity, rock anisotropic nature, AE activity and crack density. The results indicate that the fracability index (FI) and the calculated crack density (CRD) are positively linearly correlated. The method is successfully applied to evaluate the fracability of the Yingtai gas field in northeast China. (C) 2015 Elsevier B.V. All rights reserved.
机译：对于致密气藏的经济开发，水力压裂是一种有效的增产方法，其中基质渗透率极低，需要复杂的裂缝网络。岩石物理/力学实验和XRD / SEM分析表明，火山沉积岩具有天然裂缝，脆性强，应力敏感性，AE活动，各向异性弱和流体敏感性等特点。易碎指数通常被用作评估生成裂缝网络能力的关键参数。在这项研究中，建立了一种新的系统实验方法和一个新的数学模型，以综合评价致密气层的易碎性。这两种方法结合了自然裂缝，应力敏感性，岩石各向异性，AE活动和裂缝密度。结果表明，脆性指数（FI）与计算的裂纹密度（CRD）呈线性正相关。该方法已成功地应用于评价中国东北鹰台气田的易碎性。 （C）2015 Elsevier B.V.保留所有权利。

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