Prominence of ichnologically influenced macroporosity in the karst Biscayne aquifer: Stratiform "super-K" zones

Cunningham, Kevin J.; Sukop, Michael C.; Huang, Haibo; Alvarez, Pedro F.; Curran, H. Allen; Renken, Robert A.; Dixon, Joann F.

doi:10.1130/b26392.1

Cited by 45 publications

(66 citation statements)

References 33 publications

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“…The Key Largo Limestone has an unknown thickness since the deepest core drilling on Big Pine Key reached a thickness of 52 meters without reaching the base (Hoffmeister 1974 . The result is similar to what is found in Southeast Florida and the Bahamas, with high permeability that varies laterally and with depth (Hanson 1980;Halley et al 1997;Cunningham et al 2009). …”

Section: Geologysupporting

confidence: 78%

Analyzing Tidal Fluctuations in the Big Pine Key Freshwater Lens with Time-Lapse Resistivity

Tucker¹

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The tidal influence on the Big Pine Key saltwater/freshwater interface was analyzed using time-lapse electrical resistivity imaging and shallow well measurements.The transition zone at the saltwater/freshwater interface was measured over part of a tidal cycle along three profiles. The resistivity was converted to salinity by deriving a formation factor for the Miami Oolite. A SEAWAT model was created to attempt to recreate the field measurements and test previously established hydrogeologic parameters. The results imply that the tide only affects the groundwater within 20 to 30 m of the coast. The effect is small and caused by flooding from the high tide. The low relief of the island means this effect is very sensitive to small changes in the magnitude. The SEAWAT model proved to be insufficient in modeling this effect. The study suggests that the extent of flooding is the largest influence on the salinity of the groundwater.iv

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Section: Geologysupporting

confidence: 78%

Analyzing Tidal Fluctuations in the Big Pine Key Freshwater Lens with Time-Lapse Resistivity

Tucker¹

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“…This wide variation in resistivity is related primarily to changes in porosity of limestones in the Biscayne aquifer or changes in lithology others, 2006 and2009). When freshwater is replaced by saltwater in the Biscayne aquifer, its resistivity decreases dramatically.…”

Section: Hydrogeologic Setting and Other Geophysical Informationmentioning

confidence: 99%

Helicopter electromagnetic survey of the Model Land Area, Southeastern Miami-Dade County, Florida

Fitterman¹,

Deszcz-Pan²,

Prinos³

2012

Open-File Report

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“…The Biscayne Aquifer rock that is perhaps most important and investigated in this research is characterized by 'touching-vug megaporosity', which can create stratiform, areally extensive flowpaths (Cunningham and Sukop, 2011). As discussed in the earlier works including, Parker et al (1955), Fish and Stewart (1991), and Cunningham et al (2009) water is the working fluid in both field-and laboratory-scale methods. Given previous results for non-Darcian flow in these rocks (Sukop et al, 2013), the head gradient would have to be below 10 -6 in order to obey the law described above.…”

Section: Megaporous Rock Modeling Challengesmentioning

confidence: 99%

“…The following research has provided information to better characterize the Biscayne Aquifer heterogeneity and furthermore provide an understanding of these touching-vug rock types. The formation of these megaporous rocks in the Biscayne Aquifer has been described by "eogenetic biogenic processes" (Vacher and Mylorie, 2002;Cunningham et al, 2009). The biogenic megapores observed in the Biscayne Aquifer are attributed to one or more of the following post-depositional, pre-burial (eogenetic) processes: inter-and intra-burrow megaporosity, inter-and intraroot megaporosity and fossil-moldic megaporosity.…”

Section: Biscayne Aquifermentioning

confidence: 99%

Lattice Boltzmann Modeling and Specialized Laboratory Techniques to Determine the Permeability of Megaporous Karst Rock

Garcia¹

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Standard petrophysical laboratory techniques may not be capable of accurately measuring such high permeabilities. Instead, innovative procedures that can measure high permeabilities were applied. These fragile rocks cannot easily be cored or cut to shapes convenient for conducting permeability measurements. For the laboratory measurement, a 3D epoxy-resin printed rock core was produced from computed tomography data obtained from an outcrop sample. Permeability measurements were conducted using a viscous fluid to permit easily observable head gradients (~2 cm over 1 m) simultaneously with low Reynolds number flow. For a second permeability measurement, Lattice Boltzmann Method flow simulations were computed on the 3D core renderings.

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Prominence of ichnologically influenced macroporosity in the karst Biscayne aquifer: Stratiform "super-K" zones

Cited by 45 publications

References 33 publications

Analyzing Tidal Fluctuations in the Big Pine Key Freshwater Lens with Time-Lapse Resistivity

Analyzing Tidal Fluctuations in the Big Pine Key Freshwater Lens with Time-Lapse Resistivity

Helicopter electromagnetic survey of the Model Land Area, Southeastern Miami-Dade County, Florida

Lattice Boltzmann Modeling and Specialized Laboratory Techniques to Determine the Permeability of Megaporous Karst Rock

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