progress on “structural controls on the edwards/trinity aquifer interface, camp bullis quadrangle,...

PROGRESS ON “STRUCTURAL CONTROLS ON THE EDWARDS/TRINITY AQUIFER INTERFACE, CAMP

BULLIS QUADRANGLE, TEXAS”

Presented byDavid A. Ferrill

Contributors: Darrell Sims, Deborah Waiting, Alan Morris, Alvin Schultz, Allan Clark

Southwest Research Institute®

Center for Nuclear Waste Regulatory Analyses

February 2003

OVERVIEW

3D Geologic Framework Modeling - Castle Hills Quadrangle (completed during previous project)

3D Geologic Framework Modeling - Camp Bullis Quadrangle

Field work to characterize faults in Glen Rose Limestone

CASTLE HILLS QUADRANGLE 3D MODEL AREA

CAMP BULLIS QUADRANGLE

Digital terrain model

Well data(43 wells)

Geologic mapping – faults– outcrop

geology– structure

contours

CAMP BULLIS QUADRANGLE

Model horizons– Kainer Formation– Upper Glen Rose– Lower Glen Rose– Bexar Shale– Cow Creek– Pine Island Shale– Sligo Limestone

FIELD WORK TO CHARACTERZIE FAULTS IN GLEN ROSE LIMESTONE

Ralph Fair Road

State Route 46

Highway 281 & H.L. Chapman Pipeline Construction Company

Canyon Lake Spillway

H.L. CHAPMAN PIPELINE CONSTRUCTION COMPANY

CANYON LAKE SPILLWAY GORGE

FAULTS IN CANYON LAKE SPILLWAY GORGE

FAULT ZONE IN CANYON LAKE SPILLWAY GORGE

OBSERVATIONS TO DATE

Faults in Glen Rose typically less steep that faults in Edwards Group

Important stratal (limestone and shale) control on fault propagation in more shale-rich section

More common occurrence of shale layers in Glen Rose present barriers to vertical flow along faults, and enhances lateral flow along faults

progress on “structural controls on the edwards/trinity aquifer interface, camp bullis quadrangle,...

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