References
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Improving the temperature predictions of subsurface thermal models by using high-quality input data. Part 2: A case study from the Danish-German border region
We present a 3D numerical crustal temperature model and analyse the present-day conductive thermal field of the Danish-German border region. The model region covers the northernmost part of the North German Basin, a transition zone between the deep-reaching sedimentary rocks of the Glückstadt Graben (including complex salt structures) and the shallow crystalline basement of the Ringkøbing-Fyn High. The modelling approach is novel as it implements for the first time a comprehensive analysis of well-log data on a regional modelling scale. Those logs were used both to derive the spatial distribution of rock thermal conductivity across the study area, and to …
Heat flow along the Costa Rica Seismogenesis Project drilling transect: Implications for hydrothermal and seismic processes
Heat flow analysis of the Costa Rica convergent margin is carried out for seven sites drilled during Integrated Ocean Drilling Program (IODP) Expeditions 334 and 344 as part of the Costa Rica Seismogenesis Project (CRISP). These expeditions are designed to better understand erosional subduction zones. Heat flow measurements were made to improve estimates of the thermal structure of this erosive margin and are located on the incoming plate, toe, lower, middle, and upper slopes of the margin. Heat flow values corrected for the effects of seafloor bathymetry and sedimentation are on average 15% higher than uncorrected values and range from …
Compilation of heat flow data in the continental area of China (4th edition)
Terrestrial heat flow provides a direct surface indication of the thermal state within the Earth. It is a crucial parameter to reveal the lithospheric thermal structure, geodynamic processes and to evaluate the potential of geothermal resources. Measurements and compilations of heat flow data are considered as a fundamental work for geothermal study. Heat flow data in continental China have been published in three editions and the total number has reached 862 in 2001. Since then, no more compilation has been accomplished in the last 15 years. Upon the 3rd edition, 368 new heat flow data have been compiled in this …
Geothermal study at the Wenchuan earthquake Fault Scientific Drilling project-hole 1 (WFSD-1): Borehole temperature, thermal conductivity, and well log data
The Wenchuan earthquake Fault Scientific Drilling project-hole 1 (WFSD-1) offers a unique opportunity for studying the faulting behavior and the thermal regime of the Longmen Shan fault zone (LMFZ), east margin of Tibetan Plateau. Thermal conductivity of fault rocks within main fault zone shows strong negative interrelations with the porosity, the gamma ray and the P-wave slowness, as well as a positive interrelation with the density. Here we attribute these correlations to the fractures and the rock-fluid reaction generated from the earthquake, which will increase the porosity, the radioactivity and the P-wave slowness as well as decrease the density and …
The Possibility of Enhanced Geothermal System in South Sumatra Basin
The Cornubian geothermal province: heat production and flow in SW England: estimates from boreholes and airborne gamma-ray measurements
The Cornubian granite batholith provides one of the main high heat production and flow provinces within the UK. An extensive programme of borehole measurements was undertaken in the 1980s to characterise the geothermal resource. Here we revisit the published data on heat flow and heat production from 34 boreholes and revise the published heat flow values in accord with modern palaeoclimate knowledge. This leads to a more rigorous (and increased) set of estimated temperatures at depth across the granite outcrops. Predicted temperatures at a depth of 5 km largely exceed 200 degrees C and are 6-11 % higher than previously …
Updated Surface Heat Flow Map of Alaska
The 2013 update to the Geothermal Map of Alaska (GMAK) is described, including the methodology for heat flow calculation, contouring of the heat flow, and conclusions drawn from the expanded dataset. The previous version of the Geothermal Map of Alaska was published in 2004 with the Geothermal Map of North America by the Southern Methodist University Geothermal Laboratory. The 2004 map had sparse data primarily located on the North Slope and in selective areas known to have anomalously high heat flow. This sampling bias towards higher heat flow produced a high heat flow band over much of Alaska that led …
Statistical analysis of geothermal data of an oil field in parts of Niger Delta, Nigeria
The thermal structure of the central Nova Scotia Slope (eastern Canada): seafloor heat flow and thermal maturation models
The thermal history and maturation potential of the central Scotian Slope is constrained using a combination of 47 recently acquired seafloor heat flow measurements, two-dimensional (2D) seismic reflection data, available well data, simple lithospheric rift models, and thermal and petroleum systems modelling. Consistent heat flow values of 41-46 mW.m(-2) were measured seaward of the salt diapiric province and across the slope away from the influence of salt structures. Significant but highly variable increases in heat flow were measured for stations overlying salt diapiric structures, reaching values upwards of 72 mW.m(-2). Simple models of conductive heat transfer with static salt geometries …
Surface heat flow measurements from the East Siberian continental slope and southern Lomonosov Ridge, Arctic Ocean
Surface heat flow data in the Arctic Ocean are needed to assess hydrocarbon and methane hydrate distributions, and provide constraints into the tectonic origins and nature of underlying crust. However, across broad areas of the Arctic, few published measurements exist. This is true for the outer continental shelf and slope of the East Siberian Sea, and the adjoining deep water ridges and basins. Here we present 21 new surface heat flow measurements from this region of the Arctic Ocean. On the Southern Lomonosov Ridge, the average measured heat flow, uncorrected for effects of sedimentation and topography, is 574 mW/m(2) (n=4). …
The thermal structure of the lithosphere and heat source mechanism of geothermal field in Weihe Basin
Study on the thermal structure of lithosphere, as an important expansion of geothermal pattern at present, is not only a key to understand the continental lithospheric evolution and tectonic deformation, but also the issue of heat source mechanism in geothermal field. In this work, 13 newly measured high-quality terrestrial heat flow data based on systematical well-logging temperature data were reported. Then, the thermal structure of lithosphere was calculated using a one-dimensional steady-state heat conductive equation. Furthermore, the heat source mechanism of Weihe rift was analyzed. The results showed that the present-day heat flow ranged from 62.5 to 80.2 mW·m-2 with …
Geothermal gradients and heat flow variations in parts of the eastern Niger delta, Nigeria
Geothermal gradients and present day heat flow values were evaluated for about seventy one wells in parts of the eastern Niger delta, using reservoir and corrected bottom–hole temperatures data and other data collected from the wells. The results showed that the geothermal gradients in the shallow/continental sections in the Niger delta vary between 10 - 18° C/km onshore, increasing to about 24° C/km seawards, southwards and eastwards. In the deeper (marine/paralic) section, geothermal gradients vary between 18 - 45° C/km. Heat flow values computed using Petromod 1–D modeling software and calibrated against corrected BHT and reservoir temperatures suggests that heat …
Hydrocarbon maturation modeling of Paleocene to Lower Miocene source rocks in the Niger Delta Basin: implications for hydrocarbon generation
This study evaluates the hydrocarbon generation potentials and time of generation for Paleocene to Lower Miocene source rock horizons from A-1, B-1, B-2, and C-1 wells in the Niger Delta Basin using 1D Petromod modeling software. Wells A-1, B-1 and B-2, and C-1 are located within the Central Swamp, the Coastal Swamp, and the Shallow Offshore depobelts, respectively. The thermal history was derived from the rifting–subsidence heat flow model. Maturity modeling were carried out by using Easy%Ro kinetic model and a heat flow history predicting present-day heat flow which were calibrated with measured temperature data. Results of the study suggest …
Heat flow pattern at the Chicxulub impact crater, northern Yucatan, Mexico
Along an east–west profile crossing the Chicxulub impact structure in northern Yucatán, México, Curie depths were obtained from statistical-spectral analysis of a grid of aeromagnetic data (256km wide and 600km long). These depths were corrected for flight height and depth to the sea floor to determine the geothermal gradient, assuming a temperature of 580°C for the Curie temperature. Heat flow was then calculated from the geothermal gradients using a value of 2.67W/m-K for the mean crustal thermal conductivity. The results show a conspicuous heat flow high above on the impact basin. In this location, the heat flow is 80mW/m2 approximately. …
Teplovoj potok v abissal'nyh kotlovinah Pacifiki i Atlantiki Monitoring (Heat flow in the abyssal basins of the Pacific and Atlantic )
High-quality heat flow determination from the crystalline basement of the south-east margin of North China Craton
Very few of heat flow data have come from the crystalline basement in the North China Craton but rather from boreholes in the sedimentary cover of oil-gas basins. Explorations for hot dry rock (HDR) geothermal resources and porphyry gold deposits in eastern China offer now valuable opportunities to study the terrestrial heat flow in the crystalline basement. In this study, we obtained continuous temperature logs from two boreholes (the LZ borehole with a depth of 3471 m and the DR borehole with a depth of 2179 m) located in the south-east margin of the North China Craton. The boreholes have …
The thermal structure and geothermal genesis mechanism in Guide basin
Characterization of Geothermal Anomalies in the Louisiana Continental Shelf, Gulf of Mexico, Using Corrected Bottom-Hole Temperatures
Some localized, high geothermal-gradient anomalies are observed in the continental shelf off southwestern Louisiana. While typical geothermal gradients in the Louisiana shelf range from .013 °C/m to .035 °C/m, those in the anomalous areas are .035 °C/m to .054 °C/m. The present study examines possible mechanisms responsible for these anomalies. First, bottom-hole temperature (BHT) data from 266 wells from this area were added to the recently compiled database of the National Geothermal Data System. The BHTs were corrected for the effect of drilling-related disturbances. Second, a detailed geothermal gradient map of the study area was made from the updated database. …