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DOI:10.1306/07232424014
Pore pressure thresholds associated with seismogenic fault slip in the Midland Basin, West Texas, United States
Peter Hennings, Jun Ge, Elizabeth Horne, Katie Smye, and J-P Nicot
Bureau of Economic Geology, Jackson School of Geosciences, The University of Texas at Austin, Austin, TX, 78758, USA
Ahead of Print Abstract
Local cluster onset is associated with ΔPp from 37 to 529 psi (0.26–3.65 MPa) with a mean of 216 psi (1.5 MPa) and ΔPp gradient ranging from 0.458 to 0.555 psi/ft (0.010–0.012 MPa/m). Onset is associated with a variety of ΔPp histories, especially strong month to month ΔPp variability. There is a close spatiotemporal relationship between the rates of injection, ΔPp, change in critically stressed fault segment length, and seismicity. There is a loose coupling of +ΔPp and earthquake cluster development but there is a temporally tight spatiotemporal coupling of -ΔPp and earthquake rate decrease. There is a distinct contrast in the rupture sensitivity of the fault systems as subject to ΔPp, with areas in the south and southwest (65–80 psi, 0.49–0.55 MPa) activated with smaller changes as compared to areas in the north (235 psi, 1.62 MPa). This indicates that dynamic injection capacity is inherently smaller in the south as compared to the north.
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