Earthquakes and very deep groundwater perturbation mutually induced

Abstract We report unique observations from drilling and hydraulic stimulation at a depth of approximately 4.3 km in two Enhanced Geothermal System (EGS) wells at the Pohang EGS site, South Korea. We surveyed drilling logs and hydraulic stimulation data, simulated pore pressure diffusion around the...

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Autores principales:	Dugin Kaown, Kang-Kun Lee, Jaeyeon Kim, Jeong-Ung Woo, Sanghoon Lee, In-Woo Park, Daeha Lee, Jin-Yong Lee, Heejung Kim, Shemin Ge, In-Wook Yeo
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/6ff0e1a3bb244e76ae76a8be0c620b29
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spelling	oai:doaj.org-article:6ff0e1a3bb244e76ae76a8be0c620b292021-12-02T16:31:51ZEarthquakes and very deep groundwater perturbation mutually induced10.1038/s41598-021-92937-y2045-2322https://doaj.org/article/6ff0e1a3bb244e76ae76a8be0c620b292021-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-92937-yhttps://doaj.org/toc/2045-2322Abstract We report unique observations from drilling and hydraulic stimulation at a depth of approximately 4.3 km in two Enhanced Geothermal System (EGS) wells at the Pohang EGS site, South Korea. We surveyed drilling logs and hydraulic stimulation data, simulated pore pressure diffusion around the fault delineated by seismic and drilling log analyses, conducted acoustic image logging through the EGS wells, observed significant water level drops (740 m) in one of the two EGS wells, and obtained hydrochemical and isotopic variation data in conjunction with the microbial community characteristics of the two EGS wells. We discuss the hydraulic and hydrochemical responses of formation pore water to a few key seismic events near the hypocenter. We focused on how the geochemistry of water that flowed back from the geothermal wells changed in association with key seismic events. These were (1) a swarm of small earthquakes that occurred when a significant circulation mud loss occurred during well drilling, (2) the MW 3.2 earthquake during hydraulic stimulation, and (3) the MW 5.5 main shock two months after the end of hydraulic stimulation. This study highlights the value of real-time monitoring and water chemistry analysis, in addition to seismic monitoring during EGS operation.Dugin KaownKang-Kun LeeJaeyeon KimJeong-Ung WooSanghoon LeeIn-Woo ParkDaeha LeeJin-Yong LeeHeejung KimShemin GeIn-Wook YeoNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-13 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Dugin Kaown Kang-Kun Lee Jaeyeon Kim Jeong-Ung Woo Sanghoon Lee In-Woo Park Daeha Lee Jin-Yong Lee Heejung Kim Shemin Ge In-Wook Yeo Earthquakes and very deep groundwater perturbation mutually induced
description	Abstract We report unique observations from drilling and hydraulic stimulation at a depth of approximately 4.3 km in two Enhanced Geothermal System (EGS) wells at the Pohang EGS site, South Korea. We surveyed drilling logs and hydraulic stimulation data, simulated pore pressure diffusion around the fault delineated by seismic and drilling log analyses, conducted acoustic image logging through the EGS wells, observed significant water level drops (740 m) in one of the two EGS wells, and obtained hydrochemical and isotopic variation data in conjunction with the microbial community characteristics of the two EGS wells. We discuss the hydraulic and hydrochemical responses of formation pore water to a few key seismic events near the hypocenter. We focused on how the geochemistry of water that flowed back from the geothermal wells changed in association with key seismic events. These were (1) a swarm of small earthquakes that occurred when a significant circulation mud loss occurred during well drilling, (2) the MW 3.2 earthquake during hydraulic stimulation, and (3) the MW 5.5 main shock two months after the end of hydraulic stimulation. This study highlights the value of real-time monitoring and water chemistry analysis, in addition to seismic monitoring during EGS operation.
format	article
author	Dugin Kaown Kang-Kun Lee Jaeyeon Kim Jeong-Ung Woo Sanghoon Lee In-Woo Park Daeha Lee Jin-Yong Lee Heejung Kim Shemin Ge In-Wook Yeo
author_facet	Dugin Kaown Kang-Kun Lee Jaeyeon Kim Jeong-Ung Woo Sanghoon Lee In-Woo Park Daeha Lee Jin-Yong Lee Heejung Kim Shemin Ge In-Wook Yeo
author_sort	Dugin Kaown
title	Earthquakes and very deep groundwater perturbation mutually induced
title_short	Earthquakes and very deep groundwater perturbation mutually induced
title_full	Earthquakes and very deep groundwater perturbation mutually induced
title_fullStr	Earthquakes and very deep groundwater perturbation mutually induced
title_full_unstemmed	Earthquakes and very deep groundwater perturbation mutually induced
title_sort	earthquakes and very deep groundwater perturbation mutually induced
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/6ff0e1a3bb244e76ae76a8be0c620b29
work_keys_str_mv	AT duginkaown earthquakesandverydeepgroundwaterperturbationmutuallyinduced AT kangkunlee earthquakesandverydeepgroundwaterperturbationmutuallyinduced AT jaeyeonkim earthquakesandverydeepgroundwaterperturbationmutuallyinduced AT jeongungwoo earthquakesandverydeepgroundwaterperturbationmutuallyinduced AT sanghoonlee earthquakesandverydeepgroundwaterperturbationmutuallyinduced AT inwoopark earthquakesandverydeepgroundwaterperturbationmutuallyinduced AT daehalee earthquakesandverydeepgroundwaterperturbationmutuallyinduced AT jinyonglee earthquakesandverydeepgroundwaterperturbationmutuallyinduced AT heejungkim earthquakesandverydeepgroundwaterperturbationmutuallyinduced AT sheminge earthquakesandverydeepgroundwaterperturbationmutuallyinduced AT inwookyeo earthquakesandverydeepgroundwaterperturbationmutuallyinduced
_version_	1718383814951043072

Earthquakes and very deep groundwater perturbation mutually induced

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