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Ozark Aquifer • The Ozark Aquifer is a very prolific water source. • Well penetrating the total thickness may yield 2,000 gallons per minute. • The lower members of the Ozark Aquifer, the Eminence and Potosi Dolomites, are very fractured and karsted. • Many of the large springs in Missouri surface from the Eminence and Potosi Dolomites. 19
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This contrasts with earlier studies using particle tracking analyses on analogous carbonate aquifers, which used much higher values of effective porosity, typically ~ 10² times higher than our...
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Jun 7, 2022Giacomo Medici, Landis Jared West, Pippa Joanne Chapman, Steven Allan Banwart, Prediction of contaminant transport in fractured carbonate aquifer types: a case study of the Permian Magnesian Limestone Group (NE England, UK), Environmental Science and Pollution Research, 10.1007/s11356-019-05525-z, 26, 24, (24863-24884), (2019).
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The simulations suggest that it is possible for convection of seawater along the fault damage zone to form massive dolomite bodies that extend hundreds of metres vertically and along the fault within a timescale of a few tens of thousands of years, with no significant alteration of the country rock.
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laterally extensive dolomite bodies (e.g., Montañez, 1994; Qing and Mountjoy, ... theoretical predictions and also with re- spect to existing data from hydrother- mal dolomites, and have exposed some ... carbonate aquifer, and has been hypothesized to have caused regional hydrothermal dolomitization (Montañez, 1994; Qing and Mountjoy, 1992 ...
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Sucrosic and moderately indurated dolomites are most likely to fracture due to their low cohesion strength, followed by tightly indurated dolomites with high moldic porosity. Tightly indurated dolomite with little or no moldic porosity is the least likely to fracture.
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Incarbonate rocks(limestone and dolomite) thefractures maybeenlarged intocaverns when the rockisdissolvedbywater. You'llfind mostfracturesin the upper few hundredfeet ofrock. Thisisbecause theweight of the rock ontopinhibits the development of deep fractures. Inaddition,thedeeperyou go, thesmaller thewidth ofthesefractures.
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A hydrogeologic conceptual model that improves understanding of variability in aquitard integrity is presented for a fractured sedimentary bedrock unit in the Cambrian-Ordovician aquifer system of midcontinent North America. The model is derived from multiple studies on the siliciclastic St. Lawrence Formation and adjacent strata across a range of scales and geologic conditions. These studies ...
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This paper suggests a series of models for carbonate aquifers determined by the hydrogeology of the drainage basin. The models are conceptual in nature and over‐simplified in detail. The object is to provide idealized endmember aquifer types with which the more complicated real aquifers may be compared.
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The overall aim of this paper is to improve the prediction of contaminant transport in fractured carbonate aquifers showing karst development, based on the incorporation of outcrop and borehole hydrogeophysical data within groundwater flow and particle tracking models.
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Position, width and fragmentation level of fracture zones and position, sig-nificance and characteristic distance of fractures were aimed to determine in a carbonate aquifer. These are fundamental parameters, e.g. in hydrogeological modelling of aquifers, due to their role in subsurface water movements.
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Local fracture storage masks 1st straight line Finding Petroleum 16 May 2017 Material Balance; example formulation 4 From Penuela et al. SPE 68831 Initial oil + gas in fractures =Later oil + gas in fractures +oil + gas from matrix +Expansion of fracture connate water -oil + gas produced Expansion of fracture pore volume
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Abstract. The dominant paradigm for petrogenesis of high-temperature fault-controlled dolomite, widely known as "hydrothermal dolomite" (HTD), invokes upwelling of hot fluid along faulted and fractured conduits from a deep over-pressured aquifer. However, this model has several inherent ambiguities with respect to fluid sources and their dolomitisation potential, as well as mechanisms for ...
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The Upper Muschelkalk (mo) is mainly composed of limestone, marlstone, and claystone, and it forms fractured aquifers (Jochen et al., 2014; Kohlhepp et al., 2017; Seidel, 2003). The Middle Muschelkalk (mm) deposits are composed of evaporites, including dolomite marlstone, gypsum, dolomite limestone, and eroded salt layers.
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the tampa member of the arcadia formation is predominantly carbonate with variable amounts of dolostone, clay, quartz sand and minor occurrences of francolite (a carbonate-rich variety of apatite), while the nocatee member is characterized by less carbonate and more siliciclastic material (scott, 1988; wingard et al., 1993).thepeace .
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along faulted and fractured conduits from a deep over-pressured aquifer. However, this model has several inherent ambiguities with respect to fluid sources and their dolomi-tisation potential, as well as mechanisms for delivering enough of these reactive fluids to form substantial volumes of dolomite. Here, we use generic 2D and 3D reactive ...
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Tosca N & Wright V P 2015/16, Diagenetic pathways linked to labile Mg-clays in lacustrine carbonate reservoirs: A model for the origin of secondary porosity in the Cretaceous Pre-Salt Barra Velha Formation, offshore Brazil. In Armitage, P et al (eds) Reservoir Quality of Clastic and Carbonate Rocks: Analysis, Modelling and Prediction.
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prediction of fracture pattern within relatively undeformed strata ... derstanding the development of fracture networks within aquifers ... gadine Dolomite mostly contain middle shelf facies associations (Figure 2). The Byron Dolomite is char-
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sandstone, limestone and dolomite, and some shale. Water in the Simpson Group is obtained primarily from pore spaces between the sand grains in the sandstones. The Arbuckle Group, which comprises the major portion of the aquifer, consists of a thick sequence of carbonate rocks (limestone and dolomite) with minor layers of sandstone and shale.
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The first two stimulation methods are based on the dissolvability of carbonates in acids. In carbonates, acid fracturing is preferred over matrix acidizing in low confining stress and hard and low-permeability rocks [ 2 ], the cited publication found the cut-off permeability as well, as was the case with [ 3 ].
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This study implicates the importance of multidisciplinary approaches for understanding the burial/hydrothermal dissolution of dolomite rocks and predicting favourable deep/ultradeep carbonate reservoirs. 1. Introduction It is commonly believed that about 50-60% of oil and gas reservoirs in the world occur in carbonate rocks [ 1 ].
Get priceFollowing well installation, average fracture hydraulic apertures for screened intervals are found from analysis of slug tests. For the case study aquifer, this workflow predicts hydraulic apertures ranging from 0.10 up to 0.54 mm. However, groundwater flow velocities range within two order of magnitude from 13 up to 242 m/day.
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The Acid Test on Rocks. LIMESTONE, DOLOSTONE, AND MARBLE. Some rocks contain carbonate minerals, and the acid test can be used to help identify them. Limestone is composed almost entirely of calcite and will produce a vigorous fizz with a drop of hydrochloric acid. Dolostone is a rock composed of almost entirely of dolomite. It will produce a very weak fizz when a drop of cold hydrochloric ...
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Karst is a terrain with distinctive landforms and hydrology created from the dissolution of soluble rocks, principally limestone and dolomite [another carbonate rock]. Karst terrain is characterized by springs, caves, sinkholes, and a unique hydrogeology that results in aquifers that are highly productive but extremely vulnerable to contamination.
Get priceIn carbonate rocks (limestone and dolomite) the fractures may be enlarged into caverns when the rock is dissolved by water. You'll find most fractures in the upper few hundred feet of rock.This is because the weight of the rock on top inhibits the development of deep fractures.Inaddition,the deeper you go, the smaller the width of these fractures.
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ions causes a change in the dolomite lattice resulting in a loss of rotational symmetry. Aragonite is common in the modern oceans but it is rare in the ancient rock record; therefore it is safe to say that carbonate reservoirs and aquifers are composed of calcite and dolomite — limestones and dolostones. Together, those rocks make up
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In this study, we developed a 2D RT model for carbonic acid-driven reaction in fractured carbonate rock. The model employs a geochemical model that uses transition state theory, thereby capturing the dependence of reaction kinetics and thermodynamics on local concentrations of multiple species.
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The model shows a wide porosity range from 0 to 20% for the entire reservoir zone and the lithology along the wells reveals that dolomitic limestone has the highest porosities and calcareous dolomite has the lowest porosities.
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The hydrogeochemistry evaluation and turbidity problem of Mansour-Abad carbonate aquifer was investigated. General groundwater hydrochemistry The electrical conductivity (EC) of groundwater samples ranged from 703 in well to 1096 µmohs/cm in well No.4 with a mean value of 700 µmohs/cm.
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Given that as many as 198,000 of these acres are irrigated farm land, we can conclude that approximately 4.2% of the land above the aquifer is being irrigated. However, the effect this may have on Memphis aquifer is largely unknown.
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in wisconsin, the fractured siluiian dolomite and ordovician sinnipee group are important, but vulnerable, aquifers the dual-porosity natuie ofthese aquifers--high permeability fractuies transmit the majority ofthe water while the lower-permeability matrix blocks provide the storage capacity --make them exceedingly susceptible to contamination, .
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Surficial Aquifer System Intermediate Confining Unit Oligocene Eocene Upper Floridan Aquifer Fine to very fine sand, shelly in places, infrequent clay beds. Fine-grained carbonate, variably dolomitic (Arcadia Formation) Sandy wackestone (Tampa Member) Fine- to medium-grained limestone with trace organ- ics and variable dolomite and clay ...
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groundwater contamination. "Carbonate" includes limestone, dolomite, calcareous shale, and other carbonate-containing sedimentary bedrock that can develop enhanced fracture pathways due to dissolution from groundwater. Bands of carbonate bedrock can be found (1) roughly parallel to the New York Thruway from
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surface. Carbonate aquifers are common and figure highly in the supply of groundwater to wells and to surface water bodies. Much of the geochemistry of groundwater and surface waters is established by the weathering of carbonate terrain. Even in silicate terrains, such as metamorphic and igneous bedrock,
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Experimental work at Lawrence Livermore National Laboratory investigated a carbonate core (fine-grained dolomite, moderately fractured with chert infillings including a large chert nodule (~2cm)) being simultaneously injected with CO 2 and formation brine to model a simulated in-situ injection.
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certainly the most suitable aquifer for a joint patrimonial protection and exploitation of its resources. Karst aquifers: an overview Importance of karst and karst groundwater resources Karst features (Fig. 1) mainly occur in carbonate rocks, limestone and dolomite, in which formations it is con-sidered as true karst. Evaporite formations and ...
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A fractured or dissolutioned aquifer will respond to pumping stress the same way as a porous aquifer, if the scale is large enough. For instance, if you're looking at a water supply system you can run a long-term (a week or so) aquifer test and analyze it like it's a porous aquifer, because the time scale is sufficiently large. That is one of the
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Abstract An approach for characterizing secondary porosity of carbonate rocks penetrated by boreholes was applied to the Floridan aquifer system at four test sites in southeast Florida. Data used in the approach were borehole television surveys, drilling records and caliper, flowmeter, and temperature logs.
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The formations comprising the aquifer thicken dramatically to the south Thickest part of the FAS is in South Florida Basin Brackish and saline portions of the aquifer Highly permeable zones Avon Park Permeable Zone (APPZ) Boulder Zone (BZ) Hydrogeologic units from north to south have some differences in how represented in literature SFWMD
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Dissolution of the limestone or dolomite is most intensive where the water first contacts the rock surface. Aggressive dissolution also occurs where flow is focused in preexisting openings in the rock, such as along joints, fractures, and bedding planes, and in the zone of water-table fluctuation where groundwater is in contact with the atmosphere.
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