<> "The repository administrator has not yet configured an RDF license."^^ . <> . . . "Hydraulic stimulation of natural fractures as revealed by induced microearthquakes, Carthage Cotton Valley gas field, east Texas"^^ . "We produced a high-resolution microseismic image of\na hydraulic fracture stimulation in the Carthage Cotton\nValley gas field of east Texas.We improved the precision\nof microseismic event locations four-fold over initial locations by manually repicking the traveltimes in a spatial\nsequence, allowing us to visually correlate waveforms of\nadjacent sources. The new locations show vertical containment within individual, targeted sands, suggesting little or no hydraulic communication between the discrete\nperforation intervals simultaneously treated within an\n80-m section. Treatment (i.e., fracture-zone) lengths inferred from event locations are about 200 m greater at\nthe shallow perforation intervals than at the deeper intervals. The highest quality locations indicate fracturezone widths as narrow as 6 m. Similarity of adjacentsource waveforms, along with systematic changes of\nphase amplitude ratios and polarities, indicate fairly uniform source mechanisms (fracture plane orientation and\nsense of slip) over the treatment length. Composite focal\nmechanisms indicate both left- and right-lateral strikeslip\nfaulting along near-vertical fractures that strike subparallel to maximum horizontal stress. The focal mechanisms and event locations are consistent with activation of the reservoir’s prevalent natural fractures, fractures that are isolated within individual sands and trend subparallel to the expected hydraulic fracture orientation (maximum horizontal stress direction). Shear activation of these fractures indicates a stronger correlation of induced seismicity with low-impedance flow paths than is normally found or assumed during injection stimulation."^^ . "2003-04" . . "68" . "2" . . "Society of Exploration Geophysicists"^^ . . . "GEOPHYSICS"^^ . . . "00168033" . . . . . . . . . . "James T."^^ . "Rutledge"^^ . "James T. Rutledge"^^ . . "Scott"^^ . "Phillips"^^ . "Scott Phillips"^^ . . "Los Alamos National Laboratory, Geophysics Group, Seismic Research Center, USA"^^ . . . . . . "HTML Summary of #216 \n\nHydraulic stimulation of natural fractures as revealed by induced microearthquakes, Carthage Cotton Valley gas field, east Texas\n\n" . "text/html" . . . "Source parameter estimation" . . . "Collective properties of seismicity" . . . "Technology-seismicity interaction" . . . "Unconventional hydrocarbon extraction" . .