Hydrologic response of underground reservoirs to seismic vibrations

Kocharyan, G. G.; Vinogradov, E. A.; Горбунова, Е. М.; Марков, В. К.; Markov, D. V.; Pernik, L. M.

doi:10.1134/s1069351311120068

Cited by 22 publications

(23 citation statements)

References 20 publications

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“…The permeability increase depends almost linearly on the amplitude of the peak ground velocity (PGV) of the seismic waves, if it is above a threshold value of about 0.2 cm s -1 . Kocharyan et al (2011) analysed the water level response to remote earthquakes and explosions. It was shown that the amplitude of post-seismic water level changes scales with the square root of the amplitude of the dynamic strain which can change the number of open cracks and increase the effective permeability.…”

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confidence: 99%

Groundwater level changes induced by the 2011 Tohoku earthquake in China mainland

Yan

Woith²,

Wang³

2014

Geophysical Journal International

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confidence: 99%

Groundwater level changes induced by the 2011 Tohoku earthquake in China mainland

Yan

Woith²,

Wang³

2014

Geophysical Journal International

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“…3, б) отражает суперпозицию косейсмического сжатия водовмещающих пород и соответствующего притока воды в ствол скважины и импульсного роста флюидного давления вследствие нелинейной фильтрации вблизи ствола скважины, которая также сопровождалась притоком воды в ствол скважины. Как показано в публикациях [Kocharyan et al, 2011;Brodsky et al, 2003], эффекты нелинейной фильтрации могут возникать за счет локальных неоднородностей фильтрационных свойств водовмещающих пород, примыкающих к стволу скважины.…”

Section: о возможных механизмах гидрогеосейсмических вариаций уровня unclassified

EFFECTS OF THE JANUARY 30, 2016, Mw=7.2 ZHUPANOVSKY EARTHQUAKE ON THE WATER LEVEL VARIATIONS IN WELLS YUZ-5 AND E-1 IN KAMCHATKA

Болдина¹,

Копылова²

2017

Geodin. tektonofiz.

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This paper describes the water level variations in wells YuZ-5 and E-1 in Kamchatka during the Zhupanovsky earthquake that occurred on January 30, 2016 (Mw=7.2, Н=180 km). The distances from the Zhupanovsky earthquake epicenter to wells E-1 and YuZ-5 were 70 and 80 km, respectively. In well YuZ-5, the water level raised by 9.4 cm during 45 minutes after the seismic wave arrival. This effect was caused by a combination of a co-seismic rise in the water level due to the volumetric compression of the water-bearing rocks during fracturing in the earthquake source and an impulse increase in the fluid pressure near the wellbore during the seismic shocks. We estimated the amplitude of the coseismic water level increase (h=7.3 cm) and the strain value resulting from the volumetric compression of the water-bearing rocks, which is consistent with the estimated value of the coseismic volumetric deformation in the area of the well at the depth of 500m: D1 =-4.510-8. This estimation was based on the model of the dislocation source in the homogeneous isotropic elastic half-space with the parameters of the Zhupanovsky earthquake focal mechanism. After the earthquake, the water level dropped for three months at an amplitude of about ~40 cm. In order to estimate the radius of the well sensitivity to the pressure drop source, we used the model of water level lowering that followed the pressure drop in the aquifer at a distance to the well as a result of the improved filtration properties of the water-bearing rocks after the seismic shocks. The estimated radius of the well sensitivity, R is 450 m. For 3.5 months before the Zhupanovsky earthquake, ~20 cm increase in the water level was observed, which is anomalous in comparison with the average seasonal variations of the water level, as shown by the long-term observations. In our opinion, such a rise in the water level occurred in the process of the earthquake preparation, and can thus be viewed as its precursor. In well E-1, a sequence of water level changes manifested a hydrogeodynamic precursor: the water level dropped at an increased rate for 21 days before the earthquake, and raised at an amplitude of 3.7 cm during one month after the earthquake. The hydrogeodynamic precursor detected in real time gave grounds for forecasting a highly probable strong earthquake at a distance of up to 350 km from wells E-1 within a month. This forecast was reported to the Kamchatka Branch of the Russian Expert Council (KB REC) on January 21, 2016. The Zhupanovsky earthquake occurred on January 30, 2016, and its magnitude, time and location correlated with the prediction. The case of this earthquake shows that the Kamchatka Branch of the Federal Research Center 'Geophysical Survey of RAS' has the system of water level observations and data processing, which is capable of diagnosing (close to real time and retrospectively) different types of hydrogeoseismic variations in the water level in wells in case of strong seismic events, and detecting the hydrogeodynamic precursors of strong earthquakes.

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“…Different HGSV types reflect the integrated changes in the groundwater pressure under the dynamic deformation of water-bearing rocks and the concomitant filtration processes caused by the changes in the properties of the water-bearing rocks, mainly their permeability (Kopylova and Boldina, 2007;Wang and Manga, 2010). As the mecha-nisms of the change in permeability, different authors proposed the development of fracture dilatancy in water-bearing rocks (Bower and Heaton, 1978;Kanamori and Brodski, 2004;Kopylova and Boldina, 2007), groundwater degassing (Roeloffs, 1998;Kopylova et al, 2012), unclogging of the fracture-pore space (Brodsky et al, 2003;Kocharyan et al, 2011), effects of cumulative accumulation of interblock deformations (Kocharyan et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

“…On Taiwan, during the the Chi-Chi earthquake of 1999 with M w = 7.5, observations were conducted on a network of several hundred wells (Wang et al, 2001;Chia et al, 2008). Water level variations in individual wells were monitored in the USA (Woodcook and Roeloffs, 1996;Roeloffs, 1998), in Japan (Matsumoto and Roeloffs, 2003), in the Caucasus (Georgia) (Chelidze et al, 2019), in Russia on the East European platform (Kocharyan et al, 2011), in the Kamchatka Peninsula (Kopylova et al, 2016;Kopylova and Boldina, 2019), and in other seismically active regions . Studying the specificity of HGSV manifestations in individual wells makes it possible to investigate hydrogeodynamic processes initiated in the well-water-bearing rock system by seismic waves and to track the changes in the state of the water-saturated medium with time.…”

Section: Introductionmentioning

confidence: 99%

“…Such HGSV records are informative with respect to the coseismic components of a static change in the stress state of waterbearing rocks at epicentral distances d e on the order of 2-3 lengths D of an earthquake source (Wakita, 1975;Kopylova, 2006;Kopylova et al, 2010). The HGSV occurrences in these cases characteristically have complex character with the coseismic jumps in the water level recorded directly during the passage of seismic waves and then are changed by various postseis-mic (postdynamic according to (Kocharyan et al, 2011)) water level variations. In the far zones of earthquake sources (d e /D 3D), water level variations are dominated by oscillations (Cooper et al, 1965;Kopylova and Boldina, 2007;etc.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Seismic Waves in Water Level Changes in a Well: Empirical Data and Models

Копылова

Болдина

2020

Izv., Phys. Solid Earth

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The high-precision water level measurements with a sampling interval of 5-10 min were carried out in 1996-2017 in the YuZ-5 well, Kamchatka. In the obtained time series, water level variations caused by the passage of seismic waves (hydrogeoseismic variations-HGSV) during 19 earthquakes with М w = 6.8-9.1 which occurred at epicentral distances of 80-14.6 thousand km are revealed. Based on the HGSV morphological features, four main types of these variations are distinguished: oscillations (I); short (up to tens of hours) water level rises (II) superimposed on oscillations; short rises (III); and long (1.5-3 months) drawdowns (IV). The dependence of the occurrence of the revealed GHSV types on earthquake parameters (magnitude and distance), specific energy density and maximum seismic wave velocity, and the amplitude-frequency content of ground motion is analyzed based on the records at a nearest seismic station. Based on several case studies, hydrogeodynamic processes of HGSV formation are investigated using numerical modeling. It is shown that the forced and free amplitude fluctuations in the water level (types I and II) can arise due to the enhancement of groundwater pressure variations in the well-water-bearing rock system during the passage of surface seismic waves with periods corresponding to the resonant frequency of the well (τ = 44.6 s). The rise in the water level in well lasting for tens minutes to hours (types II and III of HGSV variation) is caused by the short increase in pressure under violation of the steady water flow in the direct vicinity of the well; strong local earthquakes accompanied by ground shaking with intensity I msk-64 ≥ 5 cause sustained drawdowns (type IV) due to pressure drop with the amplitudes up to 0.1 bar within a radius of up to a few hundred meters from the well.

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Hydrologic response of underground reservoirs to seismic vibrations

Cited by 22 publications

References 20 publications

Groundwater level changes induced by the 2011 Tohoku earthquake in China mainland

Groundwater level changes induced by the 2011 Tohoku earthquake in China mainland

EFFECTS OF THE JANUARY 30, 2016, Mw=7.2 ZHUPANOVSKY EARTHQUAKE ON THE WATER LEVEL VARIATIONS IN WELLS YUZ-5 AND E-1 IN KAMCHATKA

Effects of Seismic Waves in Water Level Changes in a Well: Empirical Data and Models

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