Microseismic Monitoring, Event Occurrence, and the Relationship to Subsurface Geology

Will, Robert; Smith, Valerie; Leetaru, Hannes E.; Freiburg, Jared T.; Lee, Donald W.

doi:10.1016/j.egypro.2014.11.478

Cited by 27 publications

(13 citation statements)

References 2 publications

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“…Events have been located by applying a traveltime‐ and polarization‐based location algorithm using P and S wave arrival times on three‐component (3C) sensors. A 1‐D anisotropic velocity model was utilized for event location [ Will et al ., ]. The seismicity at Decatur is characterized by an occurrence in a number of distinct clusters with no apparent migration of events with time and space from the injection well (Figure ).…”

Section: Decatur Site Characterizationmentioning

confidence: 99%

“…Occurrence of detectable microseismic events at Decatur began about 2 months after injection started. A detailed microseismic analysis revealed over 10,000 events detected by the deep sensors [ Will et al ., ]. A comparison of microseismic event activity and injection data is shown in Figure .…”

Section: Decatur Site Characterizationmentioning

confidence: 99%

“…Some of the clusters form semilinear features with a northeast striking trend extending over several hundred meters. This trend coincides roughly with the direction of the largest horizontal principal stress as derived from borehole measurements, supporting the idea of seismicity occurring along preexisting structures/faults [ Will et al ., ]. This is further supported by an analysis of focal mechanisms of some larger events using the surface network [ Kaven et al ., ].…”

Section: Decatur Site Characterizationmentioning

confidence: 99%

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Characterization of induced seismicity patterns derived from internal structure in event clusters

et al. 2017

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microseismicity induced by CO2 injection at Decatur, Illinois, occurs in distinct clusters and shows no obvious correlation with the proceeding pressure front. We analyze some of these clusters in more depth by using a waveform cross‐correlation approach. With this approach we can associate about 1400 events from two clusters, with moment magnitudes between 1.1 and −1.7, with specific formations of much smaller vertical dimensions (tens of meters) than the depth resolution of traveltime‐based event locations. The differentiation of reservoir and basement events, and the definition of subclusters by waveform correlation, rather than by location, helps to better analyze the spatiotemporal evolution of the events within a cluster. In the Decatur case, this is characterized by event migration from the reservoir into the adjacent basement. The spatial variation of Brune stress drop and Gutenberg b value exhibits signs of a fluid‐driven triggering mechanism at the cluster level, revealing a punctual hydraulic connection between reservoir and basement, most likely associated with basement faults cutting into the reservoir. The observed clustering of microseismicity can thus be explained by the lateral heterogeneity of permeability and crustal strength and is overall consistent with a pressure‐induced triggering mechanism. Hence, proper long‐term risk mitigation for large‐scale fluid injection close to the basement requires prior mapping of small subseismic basement‐connected faults.

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Section: Decatur Site Characterizationmentioning

confidence: 99%

Section: Decatur Site Characterizationmentioning

confidence: 99%

Section: Decatur Site Characterizationmentioning

confidence: 99%

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Characterization of induced seismicity patterns derived from internal structure in event clusters

et al. 2017

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“…The WellWatcher PS3 geophone array in the CCS1 well, the OYO, 3 component, 31-level array in the GM1 well and the VW1 containing the Westbay system for sampling and pressures readings at 11 levels.FromWill et al (2014).…”

mentioning

confidence: 99%

“…Simon/pre-Mt. Simon interface showing SW-NE fabric and similarly aligned microseismicity.FromWill et al (2014).…”

mentioning

confidence: 99%

Overview of microseismic response to CO2 injection into the Mt. Simon saline reservoir at the Illinois Basin-Decatur Project

Bauer

Carney

Finley

2016

International Journal of Greenhouse Gas Control

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a b s t r a c tThe Illinois Basin-Decatur Project safely and successfully injected, over three years, nearly 1.1 million tons (1 million tonnes) of supercritical carbon dioxide (CO 2 ) into the base of a 1640 ft (500 m) thick saline sandstone reservoir at a depth of 7025 ft (2.14 km). The injection interval, with its high porosity and permeability, allowed for injection pressures to be far below fracture pressures during the daily 1102 tons (1000 tonnes) injection rate. Microseismicity was monitored 1.5 years before injection, through the 3 years of injection and now during permanent shut-in which began in November 2014. The overall average of locatable events per day, during injection, was a little over 4, and events appear to be related to development on previously undetected planes of weakness. Some of these planes and active areas may be related to features developed during diagenetic or compactional processes associated with the Precambrian surface topography. Microseismicity during transient shut-in did not show a rate of decrease, large changes in magnitude, distance from the injection well, or depth.

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Microseismic Monitoring, Event Location, and Focal Mechanisms at the Illinois Basin–Decatur Project, Decatur, Illinois, USA

Bauer

Will

El-Kaseeh³

et al. 2022

Geophysical Monitoring for Geologic Carbon Storage

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Microseismic Monitoring, Event Occurrence, and the Relationship to Subsurface Geology

Cited by 27 publications

References 2 publications

Characterization of induced seismicity patterns derived from internal structure in event clusters

Characterization of induced seismicity patterns derived from internal structure in event clusters

Overview of microseismic response to CO2 injection into the Mt. Simon saline reservoir at the Illinois Basin-Decatur Project

Microseismic Monitoring, Event Location, and Focal Mechanisms at the Illinois Basin–Decatur Project, Decatur, Illinois, USA

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