Structural framework of the Edwards Aquifer recharge zone in south-central Texas

Ferrill, David A.; Sims, Darrell W.; Waiting, Deborah J.; Morris, Alan P.; Franklin, Nathan M.; Schultz, Alvin L.

doi:10.1130/b25174.1

Cited by 68 publications

(44 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Identifi cation and characterization of structures that control watershed-scale groundwater fl ow are essential for both groundwater management and understanding fl uid fl ow in bedrock aquifers (Ferrill et al, 2004;Seaton and Burbey, 2005;Denny et al, 2007). Lineaments are extensive linear surface features and the surface expression of fracture zones, faults, or geological contacts (O'Leary et al, 1976;Prost, 1994;Jackson, 1997;Singhal and Gupta, 1999).…”

Section: Introductionmentioning

confidence: 99%

“…The permeability, width, and anisotropy of a damage zone and fault core can be extremely heterogeneous along strike (Evans and Chester, 1995;Caine and Forster, 1999;Fairley and Hinds, 2004;Minor and Hudson, 2006) and vary during deformation (Chester et al, 1993). For watershed-scale groundwater fl ow, high-permeability structures are recharge and fl ow conduits that can increase subsurface connectivity (Mayer and Sharp, 1998;Flint et al, 2002;Denny et al, 2007); low-permeability barriers restrict recharge and fl ow and can compartmentalize fl ow systems (Marler and Ge, 2003;Seaton and Burbey, 2005); and conduit-barriers can have complex behavior such as compartmentalizing lateral fl ow while allowing signifi cant vertical fl ow or recharge (Ferrill et al, 2004;Bense and Person, 2006). The complexity of permeability patterns in fi eld-based, fault architecture models suggests that the assumption that lineaments are fractured conduits may be too simplistic.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Identifying watershed-scale barriers to groundwater flow: Lineaments in the Canadian Shield

Gleeson

Novakowski

2009

Geological Society of America Bulletin

View full text Add to dashboard Cite

Lineament identifi cation is a standard but controversial hydrogeologic practice. In this study, we present a rigorous examination of the hydrology of lineaments in a crystalline bedrock setting. Lineaments are reinterpreted as watershed-scale hydraulic barriers, in contrast to previous interpretations as fractured conduits that focus recharge and fl ow. In the study area, an ~900 km 2 watershed underlain by the granitic and gneissic terrain of the Canadian Shield, bedrock lineaments are associated with linear lake shores and perennial wetland complexes. Lineaments were identifi ed using a robust multi-image method and characterized by remote sensing, fracture mapping, drilling, hydraulic characterization, and numerical simulation of a coupled groundwater-surface-water system. Results indicate that two principal lineament sets are oriented parallel to fracture and fault orientations, and thus lineaments are interpreted as structural features, either fault zones or fracture zones with limited displacement. Faulted lineaments are more effectively identifi ed by digital elevation model (DEM) topographic data rather than Landsat tonal imagery. Hydrogeological characterization and geomatic data indicate that the fractured bedrock underlying lineaments is composed of poorly connected zones of reduced permeability due to fault zone and/or fl uid fl ow processes. Field data and numerical simulations suggest that lineament areas are barriers to recharge and fl ow in this setting as a result of permeability reduction. Integrated data sets and models of lineament permeability that are geologically realistic result in a better understanding of fractured bedrock aquifers and patterns of fl uid fl ow in the brittle uppermost crust.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Identifying watershed-scale barriers to groundwater flow: Lineaments in the Canadian Shield

Gleeson

Novakowski

2009

Geological Society of America Bulletin

View full text Add to dashboard Cite

show abstract

“…In the Apulia Platform, dissolution features (karst) are mainly vertically oriented and appear to be related to preexisting fractures. This is an example of dissolution of carbonate material and secondary porosity concentrated along fractures (Ferrill et al 2004;Fournillon et al 2012). Here and elsewhere, fracturing and karst dissolution reinforce one another by enhancing permeability (Jacquemyn et al 2012).…”

mentioning

confidence: 99%

Advances in carbonate exploration and reservoir analysis

Garland¹,

Neilson

Laubach

et al. 2012

View full text Add to dashboard Cite

The development of innovative techniques and concepts, and the emergence of new plays in carbonate rocks are creating a resurgence of oil and gas discoveries worldwide. The maturity of a basin and the application of exploration concepts have a fundamental influence on exploration strategies. Exploration success often occurs in underexplored basins by applying existing established geological concepts. This approach is commonly undertaken when new basins 'open up' owing to previous political upheavals. The strategy of using new techniques in a proven mature area is particularly appropriate when dealing with unconventional resources (heavy oil, bitumen, stranded gas), while the application of new play concepts (such as lacustrine carbonates) to new areas (i.e. ultra-deep South Atlantic basins) epitomizes frontier exploration.Many low-matrix-porosity hydrocarbon reservoirs are productive because permeability is controlled by fractures and faults. Understanding basic fracture properties is critical in reducing geological risk and therefore reducing well costs and increasing well recovery. The advent of resource plays in carbonate rocks, and the long-standing recognition of naturally fractured carbonate reservoirs means that new fracture and fault analysis and prediction techniques and concepts are essential.A key area of progress has been integration of stratigraphic, structural, geomechanical and diagenetic analysis to populate reservoir models accurately. Dramatic increases in computing and digital imaging capabilities are being harnessed to improve spatial analysis and spatial statistics in reservoirs and ultimately improve 3D geocellular models.

show abstract

“…Las inclinaciones entre 70°-90° son comunes en la corteza superior quebradiza (aprox. 0-2 km) en una variedad de rocas incluyendo tobas (Day et al, 1998), basaltos (Opheim y Gudmundsson, 1989;Angelier et al, 1997;Dauteuil et al, 2001), calizas (Ferrill y Morris, 2003;Ferrill et al, 2004), y las rocas sedimentarias clásticas (Walsh y Watterson, 1988). Las inmersiones de 60° son comunes a una profundidad de 2-5 km, e inclinaciones de 35°-55° son comunes en la parte inferior de la corteza quebradiza (aprox.…”

Section: Discussionunclassified

Interpretación De Los Sismos Pequeños Y Moderados Bajo El Volcán Irazú

Cascante-Matamoros¹,

Porras²

2017

REVGEO

View full text Add to dashboard Cite

RESUMENEl volcán Irazú históricamente ha presentado sismicidad volcano-tectónica esporádica. A partir de esta actividad sísmica hemos calculado un total de 7 mecanismos focales utilizando la polaridad de primeros arribos. Además, hemos realizado la inversión de esfuerzos utilizando el método PTB. Los resultados indican que la actividad sísmica se produce a profundidades entre 0-6 km en el flanco Oeste del macizo volcánico. Los mecanismos focales muestran una cinemática variada, los ángulos de los planos tienen una media de 55º y la dirección de inclinación es hacia el Sur Oeste Oeste. La inversión de esfuerzos sugiere una extensión pura con un valor de R' = 0,5. La profundidad donde ocurren los eventos sísmicos y el ángulo medio de los planos nos hace suponer que el límite dúctil-frágil se encuentra por encima de lo teóricamente establecido. Nosotros planteamos que la fuente sísmica bajo el volcán Irazú está directamente relacionada con la presencia de magma cerca de la superficie, el cual produce adelgazamiento de la corteza y fallamiento normal asociado.Palabras clave: volcán Irazú, sismicidad, mecanismos focales, fallas normales.

show abstract

Structural framework of the Edwards Aquifer recharge zone in south-central Texas

Cited by 68 publications

References 30 publications

Identifying watershed-scale barriers to groundwater flow: Lineaments in the Canadian Shield

Identifying watershed-scale barriers to groundwater flow: Lineaments in the Canadian Shield

Advances in carbonate exploration and reservoir analysis

Interpretación De Los Sismos Pequeños Y Moderados Bajo El Volcán Irazú

Contact Info

Product

Resources

About