论文标题

关于频率依赖的岩石实验:比较综述

On Frequency-Dependent Rock Experiments: A Comparative Review

论文作者

Rørheim, Stian

论文摘要

岩石性能是环境和条件依赖性的,由于许多已知和未知的原因构成了升级问题,因此使场定位比较模棱两可。在受控环境(实验室)中,未知数首先转化为已知,在挥发性环境(田间)中第二。因果关系结合的分散和衰减分别定义为频率和距离依赖性的岩石特性:分散意味着非零的衰减,反之亦然。强制振荡(FO),谐振杆(RB)和脉冲传递(PT)。是测量Hz,KHz和MHz频率的岩石性能的习惯技术。值得注意的是,FO已成为现任冠军,近年来弥合了现场实验室的空白。 FO探测地震(Hz)频率不仅是$ \ sim10^{ - 6} $ strampludes,它也类似于现场地震。 RB和PT是简洁的,但是,通过按时间顺序汇编的大多数(如果不是全部)关于沉积岩的FO详细阐述了FO,并比较了在Lucite,Aluminum和Peek等参考材料上进行所有可用的FO测量结果。首先,这种实验室间比较可以作为寻求验证自己结果的其他人的参考。讨论了FO之间的差异,替代应力和应力传感器是焦点。还描述了与FO,RB和PT相似的其他技术,例如共振超声光谱(RUS),激光超声(LUS)和差异声学共振光谱(DARS)。只有时间才能说明FO的未来,但是最终给出了合理的改进,这可能会进一步提高它。实验性与数值新颖性相结合将扩展可能的频率超出其当前限制。

Rock properties are environment- and condition-dependent which render field-laboratory comparisons ambiguous for a number of known and unknown reasons that constitute the upscaling problem. Unknowns are first transformed into knowns in a controlled environment (laboratory) and second in a volatile environment (field). Causality-bound dispersion and attenuation are respectively defined as rock properties that are frequency- and distance-dependent: dispersion implies non-zero attenuation and vice versa. Forced-Oscillation (FO), Resonant-Bar (RB), and Pulse-Transmission (PT). are the customary techniques to measure rock properties at Hz, kHz, and MHz frequencies. Notably FO has emerged as the current champion in bridging the field-laboratory void in recent years. Not only is FO probing seismic (Hz) frequencies but with $\sim10^{-6}$ strain amplitudes it is also similar to field seismic. RB and PT are concisely however FO is verbosely elaborated by chronologically compiling most (if not all) FO studies on sedimentary rocks and comparing all available FO measurements on reference materials such as lucite, aluminium, and PEEK. First of its kind, this inter-laboratory comparison may serve as a reference for others who seek to verify their own results. Differences between FO are discussed with alternative strain and stress sensors being the focal points. Other techniques such as Resonant Ultrasound Spectroscopy (RUS), Laser UltraSonics (LUS), and Differential Acoustic Resonance Spectroscopy (DARS) that are similar to FO, RB, and PT are also described. Only time will tell what the future holds for FO but plausible improvements for the future are ultimately given which may elevate it even further. Experimental combined with numerical novelty will extend the probeable frequencies beyond their current limits.

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