scholarly journals Continuous active-source seismic monitoring of C O2 injection in a brine aquifer

Geophysics ◽  
2007 ◽  
Vol 72 (5) ◽  
pp. A57-A61 ◽  
Author(s):  
Thomas M. Daley ◽  
Ray D. Solbau ◽  
Jonathan B. Ajo-Franklin ◽  
Sally M. Benson
Keyword(s):  
Seismic Velocity ◽  
Seismic Monitoring ◽  
Small Scale ◽  
Saline Aquifer ◽  
Observation Well ◽  
Velocity Change ◽  
Seismic Velocity Change ◽  
Fluid Sampling ◽  
Brine Aquifer

Continuous crosswell seismic monitoring of a small-scale [Formula: see text] injection was accomplished with the development of a novel tubing-deployed piezoelectric borehole source. This piezotube source was deployed on the [Formula: see text] injection tubing, near the top of the saline aquifer reservoir at [Formula: see text] depth, and allowed acquisition of crosswell recordings at [Formula: see text] intervals during the multiday injection. The change in traveltime recorded at various depths in a nearby observation well allowed hour-by-hour monitoring of the growing [Formula: see text] plume via the induced seismic velocity change. Traveltime changes of [Formula: see text] (up to 8%) were observed, with no change seen at control sensors placed above the reservoir. The traveltime measurements indicate that the [Formula: see text] plume reached the top of the reservoir sand before reaching the observation well, where regular fluid sampling was occuring during the injection, thus providing information about the in situ buoyancy of [Formula: see text].

scholarly journals Long-term dynamics of Piton de la Fournaise volcano from 13 years of seismic velocity change measurements and GPS observations

2014 ◽  
Vol 119 (10) ◽  
pp. 7654-7666 ◽  
Author(s):  
Diane Rivet ◽  
Florent Brenguier ◽  
Daniel Clarke ◽  
Nikolaï M. Shapiro ◽  
Aline Peltier
Keyword(s):  
Seismic Velocity ◽  
Velocity Change ◽  
Piton De La Fournaise ◽  
Seismic Velocity Change ◽  
Gps Observations

Fractional seismic velocity change related to magma intrusions during earthquake swarms in the eastern Izu peninsula, central Japan

2012 ◽  
Vol 117 (B12) ◽  
pp. n/a-n/a ◽  
Author(s):  
Tomotake Ueno ◽  
Tatsuhiko Saito ◽  
Katsuhiko Shiomi ◽  
Bogdan Enescu ◽  
Hitoshi Hirose ◽  
...  
Keyword(s):  
Seismic Velocity ◽  
Earthquake Swarms ◽  
Central Japan ◽  
Velocity Change ◽  
Izu Peninsula ◽  
Seismic Velocity Change

scholarly journals Analysis of Seismic Velocity Change and AVO Response Depending on Saturation of Kerogen and GOR in Shale Reservoirs

2016 ◽  
Vol 19 (1) ◽  
pp. 29-36
Author(s):  
Junhwan Choi ◽  
Jaewook Lee ◽  
Joongmoo Byun ◽  
Bona Kim ◽  
Soyoung Kim
Keyword(s):  
Seismic Velocity ◽  
Velocity Change ◽  
Shale Reservoirs ◽  
Seismic Velocity Change

scholarly journals Monitoring seismic velocity change caused by the 2011 Tohoku-oki earthquake using ambient noise records

2012 ◽  
Vol 39 (9) ◽  
pp. n/a-n/a ◽  
Author(s):  
Shohei Minato ◽  
Takeshi Tsuji ◽  
Shiro Ohmi ◽  
Toshifumi Matsuoka
Keyword(s):  
Ambient Noise ◽  
Seismic Velocity ◽  
Velocity Change ◽  
Seismic Velocity Change

scholarly journals In situ measurement of velocity-stress sensitivity using crosswell continuous active-source seismic monitoring

Geophysics ◽  
2017 ◽  
Vol 82 (5) ◽  
pp. D319-D326 ◽  
Author(s):  
Pierpaolo Marchesini ◽  
Jonathan B. Ajo-Franklin ◽  
Thomas M. Daley
Keyword(s):  
Seismic Velocity ◽  
Fluid Pressure ◽  
Seismic Monitoring ◽  
Stress Sensitivity ◽  
Pore Fluid ◽  
Field Scale ◽  
Pore Fluid Pressure ◽  
Active Source ◽  
Injection Zone

The ability to characterize time-varying reservoir properties, such as the state of stress, has fundamental implications in subsurface engineering, relevant to geologic sequestration of [Formula: see text]. Stress variation, here in the form of changes in pore fluid pressure, is one factor known to affect seismic velocity. Induced variations in velocity have been used in seismic studies to determine and monitor changes in the stress state. Previous studies conducted to determine velocity-stress sensitivity at reservoir conditions rely primarily on laboratory measurements of core samples or theoretical relationships. We have developed a novel field-scale experiment designed to study the in situ relationship between pore-fluid pressure and seismic velocity using a crosswell continuous active-source seismic monitoring (CASSM) system. At the Cranfield, Mississippi, [Formula: see text] sequestration field site, we actively monitored seismic response for five days with a temporal resolution of 5 min; the target was a 26 m thick injection zone at approximately 3.2 km depth in a fluvial sandstone formation (lower Tuscaloosa Formation). The variation of pore fluid pressure was obtained during discrete events of fluid withdrawal from one of the two wells and monitored with downhole pressure sensors. The results indicate a correlation between decreasing CASSM time delay (i.e., velocity change for a raypath in the reservoir) and periods of reduced fluid pore pressure. The correlation is interpreted as the velocity-stress sensitivity measured in the reservoir. This observation is consistent with published laboratory studies documenting a velocity ([Formula: see text]) increase with an effective stress increase. A traveltime change ([Formula: see text]) of 0.036 ms is measured as the consequence of a change in pressure of approximately 2.55 MPa ([Formula: see text]). For [Formula: see text] total traveltime, the velocity-stress sensitivity is [Formula: see text]. The overall results suggest that CASSM measurements represent a valid technique for in situ determination of velocity-stress sensitivity in field-scale monitoring studies.

scholarly journals Robust seismic velocity change estimation using ambient noise recordings

2016 ◽  
Vol 205 (3) ◽  
pp. 1926-1936 ◽  
Author(s):  
E. Daskalakis ◽  
C.P. Evangelidis ◽  
J. Garnier ◽  
N.S. Melis ◽  
G. Papanicolaou ◽  
...  
Keyword(s):  
Ambient Noise ◽  
Seismic Velocity ◽  
Velocity Change ◽  
Seismic Velocity Change
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