Continuous monitoring system for safe managements of CO₂ storage and geothermal reservoirs.

ABSTRACT: We have developed a new continuous monitoring system based on small seismic sources and distributed acoustic sensing (DAS). The source system generates continuous waveforms with a wide frequency range. Because the signal timing is accurately controlled, stacking the continuous waveforms enhances the signal-to-noise ratio, allowing the use of a small seismic source to monitor extensive areas (multi-reservoir). Our field experiments demonstrated that the monitoring signal was detected at a distance of ~ 80 km, and temporal variations of the monitoring signal (i.e., seismic velocity) were identified with an error of < 0.01%. Through the monitoring, we identified pore pressure variations due to geothermal operations and rains. When we used seafloor cable for DAS measurements, we identified the

SUBMITTER: Tsuji T 

PROVIDER: S-EPMC8476502 | biostudies-literature | 2021 Sep

REPOSITORIES: biostudies-literature