[Transcript of letter from James F. Austin to James Reed, April 1, 1839] (open access)

[Transcript of letter from James F. Austin to James Reed, April 1, 1839]

Copy of transcript for a letter from James F. Perry to James Reed relaying news of Monroe Edwards's trial.
Date: April 1, 1839
Creator: unknown
Object Type: Letter
System: The Portal to Texas History
[Transcript of Letter from John M. McCalla and Joseph Ficklin to Stephen F. Austin, June 1, 1836] (open access)

[Transcript of Letter from John M. McCalla and Joseph Ficklin to Stephen F. Austin, June 1, 1836]

Copy of transcript for a letter from John M. McCalla and Joseph Ficklin to Stephen F. Austin, on June 1, 1836, recommending Horatio Grooms, who has been selected as a major, to him.
Date: June 1, 1836
Creator: Ficklin, Joseph & McCalla, John M.
Object Type: Letter
System: The Portal to Texas History
Reservoir fracture mapping using microearthquakes: Austin chalk, Giddings field, TX and 76 field, Clinton Co., KY (open access)

Reservoir fracture mapping using microearthquakes: Austin chalk, Giddings field, TX and 76 field, Clinton Co., KY

Patterns of microearthquakes detected downhole defined fracture orientation and extent in the Austin chalk, Giddings field, TX and the 76 field, Clinton Co., KY. We collected over 480 and 770 microearthquakes during hydraulic stimulation at two sites in the Austin chalk, and over 3200 during primary production in Clinton Co. Data were of high enough quality that 20%, 31% and 53% of the events could be located, respectively. Reflected waves constrained microearthquakes to the stimulated depths at the base of the Austin chalk. In plan view, microearthquakes defined elongate fracture zones extending from the stimulation wells parallel to the regional fracture trend. However, widths of the stimulated zones differed by a factor of five between the two Austin chalk sites, indicating a large difference in the population of ancillary fractures. Post-stimulation production was much higher from the wider zone. At Clinton Co., microearthquakes defined low-angle, reverse-fault fracture zones above and below a producing zone. Associations with depleted production intervals indicated the mapped fractures had been previously drained. Drilling showed that the fractures currently contain brine. The seismic behavior was consistent with poroelastic models that predicted slight increases in compressive stress above and below the drained volume.
Date: November 1, 1996
Creator: Phillips, W. S.; Rutledge, J. T.; Gardner, T. L.; Fairbanks, T. D.; Miller, M. E. & Schuessler, B. K.
Object Type: Article
System: The UNT Digital Library