References

Termal'naja jevoljucija, geodinamika i sovremennaja geotermal'naja aktivnost' litosfery Kitaja (Thermal evolution, geodynamics and modern geothermal activity of the lithosphere in China )

Post-rift volcanism and high heat-flow at the ocean-continent transition of the eastern Gulf of Aden

A high heat-flow (similar to 900 mW m(-2)) has been observed over a volcanic structure at the Ocean-Continent Transition in the Eastern Gulf of Aden (Oman margin). The anomaly is superposed to a progressive increase of heat-flow across the margin and can be interpreted either by (1) heat refraction, (2) fluid discharge or (3) cooling magma. The two first explanations cannot be ruled out definitely by modelling analysis, but require unlikely thermal conductivity or permeability values. The third one implies that the latest activity of the volcano was about 100 000 years old and therefore continued c. 18 Ma after …

Present‐Day Geothermal Regime in Tarim Basin, Northwest China

Geothermal gradient and terrestrial heat flow are key parameters that describe the thermal regime of sedimentary basin, and are so vital for understanding the tectono-thermal evolution and associated hydrocarbon resource potential assessment of oil and gas bearing basin. Here we show the distribution pattern of the updated present-day geothermal gradient and calculate 38 terrestrial heat flow values in the Tarim basin, one of the biggest sedimentary basins in China, based on the formation temperature data from approximately 470 wells and 941 thermal conductivity of rocks within this basin. Our results show that the present-day geothermal gradient of Tarim basin varies …

Anomal'nyy teplovoy potok i priroda zhelobov v severnoy chasti Sval'bardskoy plity (Abnormal heat flow and the nature of the troughs in the northern part of the Svalbard Plate)

Heat-flow measurements in Late Paleoproterozic to Permian geological provinces in south and central Norway and a new heat-flow map of Fennoscandia and the Norwegian–Greenland Sea

New heat-flow determinations from 9 sites in south and central Norway, situated in Late Palaeoproterozoic to Permian geological provinces, show that topographically and palaeoclimatically corrected surface heat flow generally varies between 50 and 60 mW m− 2. The palaeoclimatic corrections are significant, typically constituting 10–20% of the final heat-flow values. Higher heat flow was encountered at 3 sites, however, only at the Fredrikstad site, situated in the high heat-producing Iddefjord granite, could this elevated heat flow be related to high heat production. A compilation of new and previously published heat-flow data from Norway show that on the scale of major …

Geotermija Ohotomorskogo regiona (Geothermy of the Okhotsk region )

Ground surface temperature history in southern Canada: Temperatures at the base of the Laurentide ice sheet and during the Holocene

We use temperature profiles from 7 deep (approximate to 2000 m) boreholes located in southern Canada to infer ground surface temperature histories (GSTH) during the Last Glacial Maximum (LGM) and the Holocene. Visual inspection of the heat flow and of the reduced temperature depth profiles reveals significant regional differences with some sites showing conspicuous signs of post glacial warming, and other indicating only very small changes in ground surface temperature. These differences are confirmed by the inversions of the temperature profiles. The most prominent variations in GST are found at the Sudbury. Ontario, sites where the present ground surface temperature …

“Uniform geothermal gradient” and heat flow in the Qiongdongnan and Pearl River Mouth Basins of the South China Sea

The Pearl River Mouth Basin (PRMB) and Qiongdongnan Basin (QDNB) are oil and gas bearing basins in the northern margin of the South China Sea (SCS). Geothermal survey is an important tool in petroleum exploration. A large data set comprised of 199 thermal conductivities, 40 radioactive heat productions, 543 measured geothermal gradient values, and 224 heat flow values has been obtained from the two basins. However, the measured geothermal gradient data originated from diverse depth range make spatial comparison a challenging task. Taking into account the variation of conductivity and heat production of rocks, we use a "uniform geothermal gradient" …

Relations entre flux de chaleur océanique et zone sismogène : cas de la subduction de Sumatra

Disparity between measured and BSR heat flow in the Xisha Trough of the South China Sea and its implications for the methane hydrate

We calculate the heat flow from the depth of bottom-simulating seismic reflectors (BSRs) on a seismic profile in the Xisha Trough of the South China Sea, and compare them with the probe heat flow measurements. The BSR heat flow turn out to be 32-80 mW/m(2), significantly lower than the measurements of 83-112 mW/m(2). Such big disparity cannot be ascribed only to the errors from parameters (parameter errors) that traditionally believed to influence the BSR heat flow. Besides the parameter errors, we discuss emphatically the errors coming from the theoretical assumption for the BSR heat flow determination (theoretical errors), which occur …

Completion of surface heat flow program 5 july 2009

Texas heat flow patterns

Geothermal Energy Potential in Selected Areas of Western Australia (Canning Basin)

Hot Dry Rocks Pty Ltd (HDRPL) was commissioned by the Department of Mines and Petroleum (DMP; formerly Department of Infrastructure and Resources), Western Australia, to appraise the geothermal potential of the Canning Basin as part of Project DOIR0681008. A total of 274 wells were assessed in accordance with the quotation, 113 of which were assessed in detail for heat flow modelling and temperature prediction. Of these 113 wells, 101 had sufficient data to enable the modelling of heat flow.

Gravity crustal models and heat flow measurements for the Eurasia Basin, Arctic Ocean

Heat flow anomalies in the Gulf of Cadiz and off Cape San Vincente, Portugal

Heat flow anomalies provide critical information in active tectonic environments. The Gulf of Cadiz and adjacent areas are affected by the plate convergence between Africa and Europe, causing widespread deformation and faulting. Active thrust faults cause lateral movement and advection of heat that produces systematic variations in surface heat flow. In December 2003 new heat flow data were collected during the research vessel Sonne cruise SO175 in the Gulf of Cadiz over two sites of recent focused research activity: (i) the Gulf of Cadiz sedimentary prism and (ii) the Marques de Pombal escarpment. Both features have also been discussed as …

Heat flow distribution in Chinese continent and its adjacent areas

Using a compilation of 6980 heat flow measurements, we produce a new heat flow map for the Chinese continent and its adjacent areas. We develop an objective and integrated method to interpolate the heat flow data, taking into account both the uniformity within geological units and coherency of regional heat flow. The geologic units are outlined based on Zhang et al.'s active tectonic block model. Our heat flow model is presented in two formats: a contour map and a heat flow dataset with values on a 1 x 1 x grid for the Chinese continent and its adjacent areas, reflecting …

Geothermal Energy Potential in Selected Areas of Western Australia (Perth Basin)

Hot Dry Rocks Pty Ltd (HDRPL) was commissioned by the Department of Industry and Resources (DoIR), Western Australia, to appraise the geothermal potential of the Perth Basin as part of RQF DOIR0060108. A total of 250 wells were assessed in accordance with the quotation, 170 of which were assessed in detail for heat flow modelling and temperature prediction. Of these 170 wells, 162 had sufficient data to enable the modelling of heat flow.

Estimates of heat flow and heat production and a thermal model of the Sao Francisco craton

An updated analysis of geothermal data from the highland area of eastern Brazil has been carried out and the characteristics of regional variations in geothermal gradients and heat flow examined. The database employed includes results of geothermal measurements at 45 localities. The results indicate that the Salvador craton and the adjacent metamorphic fold belts northeastern parts of the study area are characterized by geothermal gradients in the range of 6-17 degrees C/km. The estimated heat flow values fall in the range of 28-53 mW/m(2), with low values in the cratonic area relative to the fold belts. On the other hand, …

Surface heat flow and the mantle contribution on the margins of Australia

We present thermal data from 473 oil exploration wells in Australia and New Zealand. Approximately 2300 bottom-hole temperatures are corrected to form a homogeneous set along with 86 temperatures from reservoir tests. Thermal conductivity profiles are estimated from a set of geophysical well logs using a recently developed neural network approach. Retaining wells in which temperature and thermal conductivity data overlap over an interval greater than 1000 m, we estimate 10 heat flow values in the Taranaki basin of New Zealand and 270 values in the northwestern, western, and southern margins and in the intracontinental Canning basin of Australia. The …

The thermal regime of South African continental margins

We present thermal data from 100 oil exploration boreholes on the continental margins of South Africa. Near surface temperature profiles are constrained with temperatures acquired during reservoir tests, corrected bottom-hole temperatures and seafloor temperatures. The thermal conductivity profiles are estimated from geophysical well logs using a neural network method. Available data allow us to determine 41 new heat flow values computed from depth ranges greater than 1000 m, located on the western and southern continental margins of South Africa. We believe that the variations in surface heat flow are not controlled by the contribution of the sediments or the basement, …