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Helium release during shale deformation: Experimental validation

机译：页岩变形过程中的氦释放：实验验证

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摘要

This work describes initial experimental results of helium tracer release monitoring during deformation of shale. Naturally occurring radiogenic He-4 is present in high concentration in most shales. During rock deformation, accumulated helium could be released as fractures are created and new transport pathways are created. We present the results of an experimental study in which confined reservoir shale samples, cored parallel and perpendicular to bedding, which were initially saturated with helium to simulate reservoir conditions, are subjected to triaxial compressive deformation. During the deformation experiment, differential stress, axial, and radial strains are systematically tracked. Release of helium is dynamically measured using a helium mass spectrometer leak detector. Helium released during deformation is observable at the laboratory scale and the release is tightly coupled to the shale deformation. These first measurements of dynamic helium release from rocks undergoing deformation show that helium provides information on the evolution of microstructure as a function of changes in stress and strain.
机译：这项工作描述了页岩变形期间氦示踪剂释放监测的初步实验结果。在大多数页岩中，天然存在的放射源He-4浓度很高。在岩石变形期间，随着裂缝的产生和新的运输路径的产生，积累的氦气可能被释放。我们介绍了一项实验研究的结果，在该实验中，平行和垂直于地层的受限储层页岩样品，最初用氦气饱和以模拟储层条件，经受了三轴压缩变形。在变形实验中，系统地跟踪了不同的应力，轴向和径向应变。使用氦质谱仪检漏仪动态测量氦的释放。在实验室规模上观察到变形期间释放的氦气，并且释放与页岩变形紧密相关。这些从变形岩石中释放出的动态氦的最初测量结果表明，氦提供了有关微结构演变（随应力和应变变化而变化）的信息。

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