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首页> 外文期刊>Journal of natural gas science and engineering >Effective evaluation of shale gas reservoirs by means of an integrated approach to petrophysics and geomechanics for the optimization of hydraulic fracturing: A case study of the Permian Roseneath and Murteree Shale Gas reservoirs, Cooper Basin, Australia
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Effective evaluation of shale gas reservoirs by means of an integrated approach to petrophysics and geomechanics for the optimization of hydraulic fracturing: A case study of the Permian Roseneath and Murteree Shale Gas reservoirs, Cooper Basin, Australia

机译：通过综合评估页岩气藏的岩石物理学和地质力学综合方法，用于优化液压压裂：以澳大利亚Cooper Basin，Cooper Basin，Cooper Basin的案例研究

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Brittleness and in-situ stress states are known critical indicators for screening prospected layers during hydraulic fracturing in unconventional reservoirs. Brittleness can be inferred from mechanical parameters and mineralogical data, primarily using empirical relations, although an incomplete dataset limits their use. Therefore, a dataset with a systematic framework was designed based on well logs, and details core data spudded in the Permian Roseneath and Murteree shales from the Cooper Basin, Australia. Petrophysical and geomechanical models were designed to indicate shale mineralogy, total organic richness, porosity, in-situ stress conditions, brittleness index, pore pressure, and fracture pressure gradient. After a review of various definitions of brittleness index (BI) in recent literature, it will be argued that the definition of a brittleness index is with reference to either elastic parameters, mineralogical composition, or strength parameters. Consequently, a higher brittleness index is assigned to quartz and siderite rich rocks than to clay, organic matter, and porosity rich rocks. Some recent definitions of BI are therefore useful for indicating rock types, but brittle/ductile behavior is not necessarily any indicator of brittle/ductile failure during stimulation. It is therefore proposed that an accurate BI must be incorporated into a geomechanical model. This new model will comprise the following properties: elastic and strength parameters, in-situ stress state, fracture pressure gradient, and pore pressure. Such an integrated model can be used to find 1) Fracture barriers (the layers hindering fracture growth); 2) Potential layers that enhance fracture growth, and; 3) Direction of induced fractures on the bases of the stress regime.
机译：脆性和原位应力状态是已知的，用于在非传统水库中液压压裂期间筛选展示层的关键指标。脆性可以从机械参数和矿物学数据推断，主要使用经验关系，尽管不完整的数据集限制了它们的使用。因此，基于井日志设计了一个具有系统框架的数据集，并详细介绍了澳大利亚Cooper Basin的Permian Romeneath和Murteree Shales中的核心数据。岩石物理和地质力学模型旨在表示页岩矿物学，总有机丰富，孔隙率，原位应力条件，脆性指数，孔隙压力和断裂压力梯度。在近期文献中对脆性指数（BI）的各种定义进行了审查，应说明脆性指数的定义是参考弹性参数，矿物组合物或强度参数。因此，将更高的脆性指数分配给石英和富岩石的岩石，而不是粘土，有机物和富孔岩。因此，BI的一些最近定义对于指示岩石类型是有用的，但脆性/延展性行为不一定在刺激期间的任何脆性/延展性失效的指标。因此，建议必须将准确的BI合并到地质力学模型中。该新模型将包括以下性质：弹性和强度参数，原位应力状态，断裂压力梯度和孔隙压力。这种综合模型可用于找到1）断裂屏障（妨碍骨折生长的层）; 2）增强骨折生长的潜在层，和; 3）诱导骨折对压力制度基础的骨折的方向。

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