Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2020WR028140 |
Distributed Acoustic Sensing (DAS) as a Distributed Hydraulic Sensor in Fractured Bedrock | |
M. W. Becker; T. I. Coleman; C. C. Ciervo | |
2020-08-14 | |
发表期刊 | Water Resources Research
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出版年 | 2020 |
英文摘要 | Distributed Acoustic Sensing (DAS) was originally intended to measure oscillatory strain at frequencies of 1 Hertz or more on a fiber optic cable. Recently, measurements at much lower frequencies have opened the possibility of using DAS as a dynamic strain sensor in boreholes. A fiber optic cable mechanically coupled to a geologic formation will strain in response to hydraulic stresses in pores and fractures. A DAS interrogator can measure dynamic strain in the borehole which can be related to fluid pressure through the mechanical compliance properties of the formation. Because DAS makes distributed measurements, it is capable of both locating hydraulically active features and quantifying the fluid pressure in the formation. We present field experiments in which a fiber optic cable was mechanically coupled to two crystalline rock boreholes. The formation was stressed hydraulically at another well using alternating injection and pumping. The DAS instrument measured oscillating strain at the location of a fracture zone known to be hydraulically active. Rock displacements of less than one nanometer were measured. Laboratory experiments confirm that displacement is measured correctly. These results suggest that fiber optic cable embedded in geologic formations may be used to map hydraulic connections in three dimensional fracture networks. A great advantage of this approach is that strain, an indirect measure of hydraulic stress, can be measured without beforehand knowledge of flowing fractures that intersect boreholes. The technology has obvious applications in water resources, geothermal energy, CO2 sequestration, and remediation of groundwater in fractured bedrock. |
领域 | 资源环境 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/287794 |
专题 | 资源环境科学 |
推荐引用方式 GB/T 7714 | M. W. Becker,T. I. Coleman,C. C. Ciervo. Distributed Acoustic Sensing (DAS) as a Distributed Hydraulic Sensor in Fractured Bedrock[J]. Water Resources Research,2020. |
APA | M. W. Becker,T. I. Coleman,&C. C. Ciervo.(2020).Distributed Acoustic Sensing (DAS) as a Distributed Hydraulic Sensor in Fractured Bedrock.Water Resources Research. |
MLA | M. W. Becker,et al."Distributed Acoustic Sensing (DAS) as a Distributed Hydraulic Sensor in Fractured Bedrock".Water Resources Research (2020). |
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