What question did this study set out to answer?

Investigate faulting mechanics, fluid-flow interactions, and seismic deformation induced by hydraulic fracturing in tight sandstone formations.

October 1, 2004Bulletin of the Seismological Society of America

Faulting Induced by Forced Fluid Injection and Fluid Flow Forced by Faulting: An Interpretation of Hydraulic-Fracture Microseismicity, Carthage Cotton Valley Gas Field, Texas

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JRJames RutledgeSchool for Advanced Research

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Implication

Geophysical analysis reveals strike-slip faulting and fluid expulsion during hydraulic fracturing, indicating substantial aseismic slip reduces effective reservoir drainage.

Key Points

Investigate faulting mechanics, fluid-flow interactions, and seismic deformation induced by hydraulic fracturing in tight sandstone formations.
Analyzed high-precision microearthquake locations recorded during five hydraulic fracturing treatments in two boreholes within the Upper Cotton Valley formation.
Evaluated focal mechanisms, spatial clustering at fault jogs, and shear deformation measured as seismic moment release per unit volume across varying injection flow rates and fluid viscosities.
Microearthquakes consistently exhibited strike-slip faulting subparallel to maximum horizontal stress, yielding a constant moment release per unit volume injected irrespective of fluid viscosity or injection rate.
Dense clusters at fault jogs showed outward spatial divergence over time due to fluid expulsion, followed by stress concentrations that generated fewer but higher-magnitude events.
Large seismic moment deficits relative to injected fluid volumes indicate that substantial reservoir deformation occurs via stable, aseismic slip.

Cite This Study

James Rutledge (2004) studied this question.

synapsesocial.com/papers/6a1e1d7b331f16ef469fdc59 https://doi.org/10.1785/012003257

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Implication

Geophysical analysis reveals strike-slip faulting and fluid expulsion during hydraulic fracturing, indicating substantial aseismic slip reduces effective reservoir drainage.

Faulting Induced by Forced Fluid Injection and Fluid Flow Forced by Faulting: An Interpretation of Hydraulic-Fracture Microseismicity, Carthage Cotton Valley Gas Field, Texas

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Cite This Study

Faulting Induced by Forced Fluid Injection and Fluid Flow Forced by Faulting: An Interpretation of Hydraulic-Fracture Microseismicity, Carthage Cotton Valley Gas Field, Texas

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