Abstract:
:The modern energy economy and environmental infrastructure rely on the flow of fluids through fractures in rock. Yet this flow cannot be imaged directly because rocks are opaque to most probes. Here we apply chattering dust, or chemically reactive grains of sucrose containing pockets of pressurized carbon dioxide, to study rock fractures. As a dust grain dissolves, the pockets burst and emit acoustic signals that are detected by distributed sets of external ultrasonic sensors that track the dust movement through fracture systems. The dust particles travel through locally varying fracture apertures with varying speeds and provide information about internal fracture geometry, flow paths and bottlenecks. Chattering dust particles have an advantage over chemical sensors because they do not need to be collected, and over passive tracers because the chattering dust delineates the transport path. The current laboratory work has potential to scale up to near-borehole applications in the field.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Pyrak-Nolte LJ,Braverman W,Nolte NJ,Wright AJ,Nolte DDdoi
10.1038/s41467-020-19087-zsubject
Has Abstractpub_date
2020-10-19 00:00:00pages
5282issue
1issn
2041-1723pii
10.1038/s41467-020-19087-zjournal_volume
11pub_type
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