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Showing 1 to 20 of 31 for “"geothermal gradient"”.
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A combination of apatite fission track and (U-Th)/He thermochronometers to constrain the escarpment evolution in south eastern Australia: a case study of high elevation passive margins
… caused the removal of 3-4.5 km (depending on the geothermal gradient) of crust at the coast and of approximately 2 km at the present base of the escarpment. The thermochronological data are inconsistent with the downwarped rift shoulder model and the apatite (U-Th)/He data indicate that, while the …
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Origin and Diagenesis of Lacustrine Sediments of the Late Oligocene Creede Formation, Southwestern Colorado
… vitric tuff within an elevated geothermal gradient (90$\sp\circ$-150$\sp\circ$C/km). The abundance of clinoptilolite - Al-smectite in drillcore CCM-2 is consistent with diagenetic waters having low to moderate salinity and a pH of 7-9. The higher-grade mineral assemblage …
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Conduction Plus Convection Heat Flow Modeling for the Linga Complex, Peruvian Coastal Batholith
… 10-15m2 to cool from 900°C to 600°C in a 25°C/km geothermal gradient. Compared to this, an 8×3km2 pluton took 20% less and a 12×2km2 pluton 50% less. Varying the permeability from 10-22 to 10-14m2 changed cooling time from 180 to 125kyrs. This range of permeabilities could reproduce conditions for …
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Characterizing Supercritical Methane Adsorption on Shale by a Multi-site Model
… properties, such as reservoir porosity, a geothermal gradient, as well as a pressure gradient have been investigated and shown to affect the GIP.
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Compaction-Driven Groundwater Flow and Heat Transfer in Intracratonic Sedimentary Basins and Genesis of the Upper Mississippi Valley Mineral District (Hydrology, Migration, Petroleum, Ore Deposits, Numerical Models)
… fluids move laterally. The hydraulic potential gradient with depth reverses itself near the basal aquifer, and fluids in this area have a tendency to migrate obliquely into stratigraphically lower sediments. Only small excess pressures develop, suggesting that intracratonic basins are not …
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Late Cenozoic basalts from the Basin-Range province, western United States
… between 40 and 60 km in response to an elevated geothermal gradient. The basaltic andesites may be derived from hydrous alkali basalt magma by fractionation at depths of 30 to 40 km.
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Pressure, temperature, and stress conditions of Southern Alpine Fault (New Zealand) mylonites
… and temperature are related to variation in geothermal gradient between the two areas, with the southern Alpine Fault escaping rapid exhumation that advected considerable heat into the upper crust of the central Alpine Fault over the past ~6 m.y.. The observed magnitudes of peak stress in the …
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Geothermal Resource Assessment of Mississippi
Geothermal energy is exploited through the process of using hot water or steam extracted from reservoirs of geothermal heat in Earth's crust which is derived from the upward convection and conduction of heat from Earth’s mantle and core. This energy can be harnessed to power geothermal heat pumps, …
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Interplay of porous media and fracture stimulation in sedimentary enhanced geothermal systems : Red River Formation, Williston Basin, North Dakota
Fracture stimulated enhanced geothermal systems (EGS) can be installed in both crystalline rocks and sedimentary basins. The Red River Formation (Ordovician), which lies between 3.6 and 4.2 km depth in the Williston Basin, is a viable site for installation of sedimentary EGS (SEGS). SEGS is …
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Assessing surface and underground cooling methods, coupled to efficient ventilation systems to improve the climatic conditions in deep and hot mines
… characteristics such as auto-compression, geothermal gradient, depth, and others. Evaluation of each heat source contribution to the mines' heat load profile is crucial to select an optimized cooling system for an underground mine. In order to help with the selection of the most effective …
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Exploring wellbore and reservoir temperature profiles in fluid circulation and production operations
… the production operations. Also, the initial geothermal formation temperature resulting from the geothermal gradient will help to understand the undistributed formation temperature and the heat flow behavior.</p><p>In general, there are two type of models; the first type depends on the …
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A geological study of the River Ranch kimberlite pipe and associated diamonds and mantle minerals : Limpopo Mobile Belt, Zimbabwe
… from the kimberlites is 1200°C, suggesting a geothermal gradient rather higher than seen in the Kaap-Vaal craton. The diamonds at River Ranch are predominantly brown, strongly resorbed and have less than average value. It is predicted that a combination of kimberlite petrography, micro-diamond …
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Kinematic and flexural isostasy modeling in central nepal: using erosional, depositional, and cooling histories to validate a balanced cross section
… the flexural isostasy model using a constant geothermal gradient. Cooling ages should be modeled using thermokinematic modeling software to determine the evolution of the thrust belt thermal structure.
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Crustal, Thermal, and Structural Controls on Hydrocarbon Systems in the Delaware Basin, West Texas, and Southeastern New Mexico
… an integrated analysis of the geophysical and geothermal expression of Mesoproterozoic – early Miocene tectonic events affecting hydrocarbon production in the Delaware Basin, the western physiographical province of the complexly structured, intracratonic Greater Permian Basin based on the …
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Exploration and Production Risk Mitigation for Geothermal Adoption in the Energy Transition
Geothermal provides a continuous, low-emissions source of energy with enormous potential in the United States, both singularly or as part of a broader energy mix. Although a small contributor to the current national energy grid, geothermal electricity generation dates back nearly a century for …
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Identification of a thermal maturation high, revised maturity map, and production trends of the Late Devonian Duvernay Formation, Alberta, Canada.
… is interpreted to be related to an increase in geothermal gradient induced by the convective flow of hydrothermal fluids through a fault and fracture network stemming from the reactivation of the Snowbird Tectonic Zone during the Laramide Orogeny. Successful Duverney hydrocarbon production is …
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Diagenesis and Reservoir Characterization of the Pennsylvanian Middle Atoka Formation, Sebastian and Logan Counties, West-Central Arkansas
… organic acids or as a result of the increasing geothermal gradient. Diagenetic processes either enhance the porosity by dissolving mineral grains, or reducing the porosity by stimulating growth of clay and quartz minerals.</p> <p>Amalgamated reservoirs contain higher amount of dissolution, clay …
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The architecture and evolution of intracontinental orogens: a structural, metamorphic and geochemical characterisation.
… by pervasive mylonitic deformation and low geothermal gradient metamorphism that formed at deep crustal levels (P = 10–14 kbar and T = 700–800 °C). Peak metamorphic conditions were attained at c. 570 Ma, followed by slow cooling to 600–660 °C by c. 540 Ma, at an average rate of 2–6 °C Myr⁻¹. …
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Controls on the diversity of the fault slip styles at the brittle-ductile transition: examples from the Cape Fold Belt, Nuy Valley, South Africa
… study was active at 10 - 15 km deep at 25C.km-1 geothermal gradient. The temperature over this transition is relatively constant and short ranged throughout geological evolution of Worcester and the cyclic superposition of ductile and brittle deformation and change in slip styles along fault …
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Diagenetic controls on porosity, thermal history, and hydrocarbons in the Wolfcamp A, eastern Midland Basin, Texas
… is the much deeper Val Verde Basin. A modern geothermal gradient map shows a high-gradient plume, directed northward from the Val Verde Basin, with NE-SW- and NW-SE-oriented boundaries. NE-directed Laramide compressive stress resulted in NE-SW and NW-SE fracture sets. Laramide fracturing in …
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