scholarly journals Heat flow and hot dry rock geothermal resources of the Clearlake Region, northern California

1996 ◽  
Author(s):  
K.L. Burns
Keyword(s):  
Heat Flow ◽  
Northern California ◽  
Geothermal Resources ◽  
Hot Dry Rock

Heat flow and geothermal resources in northern Italy

2014 ◽  
Vol 36 ◽  
pp. 277-285 ◽  
Author(s):  
V. Pasquale ◽  
M. Verdoya ◽  
P. Chiozzi
Keyword(s):  
Heat Flow ◽  
Northern Italy ◽  
Geothermal Resources

The Global Heat Flow Database: a collaborative and fundamental revision process to ensure comprehensible and reliable heat-flow records

2021 ◽  
Author(s):  
Sven Fuchs ◽  
Graeme Beardsmore ◽  
Paolo Chiozzi ◽  
Orlando Miguel Espinoza-Ojeda ◽  
Gianluca Gola ◽  
...  
Keyword(s):  
Heat Flow ◽  
International Association ◽  
Thermal Studies ◽  
Open Data ◽  
Scientific Work ◽  
Global Scale ◽  
Fundamental Parameter ◽  
Flow Data ◽  
Geothermal Resources ◽  
External Data

<p>The compilation of global heat-flow data is currently under major revision by the International Heat Flow Commission (IHFC) of the International Association of Seismology and Physics of the Earth's Interior (IASPEI). Heat flow represents a fundamental parameter in thermal studies, e.g., the evolution of hydrocarbons or mineral and geothermal resources. Comparable, comprehensible and reliable heat-flow data are of utmost interest also for geophysical and geological studies on the global scale. Here, we present the first results of a stepwise revision of the IHFC Global Heat Flow Database based on a researcher driven, collaborative approach. The first step comprises the review and revision of the most recent database structure established in 1976. The revised structure of the Global Heat Flow Database considers the demands and opportunities presented by the evolution of scientific work, digitization and the breakthroughs in database technologies over the past decades.  Based on the new structure, the existing dataset will be re-assessed and new data incorporated. By supporting the ideas of FAIR and open data principles, the new database facilitates interoperability with external data services, like DOI and IGSN numbers, and other data resources (e.g., world geological map, world stratigraphic system, and International Ocean Drilling Program data). We give an overview of the new database and introduce the community workflow of global heat-flow data revision.</p>

scholarly journals Integration of 3D Geological Modeling and Geothermal Field Analysis for the Evaluation of Geothermal Reserves in the Northwest of Beijing Plain, China

Water ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 638
Author(s):  
Zhenzhou Zhu ◽  
Xiaodong Lei ◽  
Nengxiong Xu ◽  
Dongyue Shao ◽  
Xingyu Jiang ◽  
...  
Keyword(s):  
Heat Flow ◽  
Three Dimensional ◽  
Scientific Basis ◽  
Geothermal Field ◽  
Field Analysis ◽  
Geological Modeling ◽  
Geothermal Resources ◽  
3D Geological Modeling ◽  
Beijing Plain ◽  
Distribution Of Resources

With the increasing demand for energy and the growing concern for atmospheric pollution in Beijing, China, the exploitation and utilization of geothermal resources are becoming more desirable. The study combined three-dimensional geological modeling with geothermal field analysis to make clear the potential and distribution of geothermal resources in the northwest of the Beijing plain, which could provide a scientific basis for rational utilization in the study area. Based on the analysis of the geological data and geothermal conditions, we created a 3D geological model of the study area, and then added isothermal surfaces into the model and analyzed the heat flow to enhance the understanding of the present geothermal field. After that, the volumes of different temperature intervals of heat reservoirs were calculated accurately and automatically by the integration of the model and the isothermal surfaces. Finally, the geothermal reserves were calculated by the improved volumetric method, and the distribution of resources was analyzed comprehensively. The results showed that, in the study area, the heat flow values ranged from 49 to 99 mW m−2, and the average elevations of 25 °C, 40 °C, and 60 °C isothermal surfaces were at −415 m, −1282 m, and −2613 m, respectively. The geothermal reserves were 5.42 × 1019 J and the volume of the heat reservoir was 4.88 × 1011 m3. The geothermal resources of the study area had good potential and could support local green development.

scholarly journals In situ determination of heat flow in unconsolidated sediments

Geophysics ◽  
1981 ◽  
Vol 46 (1) ◽  
pp. 76-83 ◽  
Author(s):  
J. H. Sass ◽  
J. P. Kennelly ◽  
W. E. Wendt ◽  
T. H. Moses ◽  
J. P. Ziagos
Keyword(s):  
Heat Flow ◽  
Thermal Gradient ◽  
Equilibrium Temperature ◽  
Unconsolidated Sediments ◽  
Heat Sources ◽  
Geothermal Resources ◽  
Flow Measurements ◽  
Thermal Measurements

Subsurface thermal measurements are the most effective, least ambiguous tools for locating geothermal resources. Measurements of thermal gradient in the upper few tens of meters can delineate the major anomalies, but it is also desirable to combine these gradients with reliable estimates of thermal conductivity, to provide data on the energy flux and to constrain models of the heat sources responsible for the anomalies. Problems associated with such heat flow measurements include the economics of casing or grouting holes, the long waits and repeated visits necessary to obtain equilibrium temperature values, the possible legal liability arising from disturbance of aquifers, the hazards presented by pipes protruding from the ground, and the security problems associated with leaving cased holes open for periods of weeks to months.

scholarly journals Reappraisal of Heat Flow Variations in Mainland Africa

2021 ◽  
Vol 4 (1) ◽  
pp. 26-78
Author(s):  
Jorge Luiz dos Santos Gomes ◽  
Fábio Pinto Vieira ◽  
Valiya Mannathal Hamza
Keyword(s):  
Heat Flow ◽  
Heat Budget ◽  
Tectonic Setting ◽  
High Heat ◽  
Data Sets ◽  
Resource Base ◽  
Geothermal Resources ◽  
The North ◽  
Vertical Distributions ◽  
Available Information

A reappraisal of geothermal data of the mainland of Africa has been carried out based on data sets available at the IHFC website, incremented with updated information on volcanic activities of post Holocene times. Our compilation makes use of 1480 heat flow values that include 1327 observational data supplemented with 36 estimates derived from heat flow-age relation. In addition, the method of magmatic heat budget (MHB) has been employed in deriving deep crustal heat flow values for 117 for sites of recent volcanic activity, most of it located in Ethiopia. These data sets were regrouped into regular equal-area cells with dimensions of 5 x 5 degrees and subsequently employed in deriving maps of the regional distributions of heat flow and geothermal resources and interpreted on the basis of available information on tectonic setting and geological characteristics. The most prominent features are the relatively high values in the region of rift valleys in the eastern sector of the continent. High heat flow values also occur along north-south trending belts of Atlas Mountains in the north and pockets associated with the Cameroon volcanic chain on the west-central parts of the continent. The vertical distributions of temperatures were calculated for depths reaching down to 6 km. The associated resource base calculations indicate availability of high temperature resources in vast regions of the African continent.

scholarly journals Estimation of Geothermal Gradient and Heat Flow for Determination of Geothermal Energy Sources in Monguno Area of Northeastern Nigeria

2019 ◽  
pp. 1-8
Author(s):  
B. C. Udochukwu ◽  
M. Akiishi ◽  
A. A. Tyovenda
Keyword(s):  
Heat Flow ◽  
Curie Point ◽  
Geothermal Energy ◽  
Geothermal Gradient ◽  
High Heat ◽  
Curie Point Depth ◽  
The South ◽  
Geothermal Resources ◽  
North East ◽  
Curie Depth

The aeromagnetic data of Monguno area northeastern Nigeria have been used to estimate Curie point depth, geothermal gradients and heat flow using spectral analysis. These geothermal parameters were subsequently employed to identify areas of geothermal resources. First order polynomial fitting was applied in Regional-residual separation. The Curie point depth obtained in this area ranges from 10.318 to 24.476 km with an average of 13.387 km, the geothermal gradient of the area varies from 23.697 to 56.212°C /km, with an average of 46.195°C /km, while the heat flow ranges from 59.242 to 136.176 mWm-2, with an average value of about 112.364 mWm-2. It was also observed that the deepest Curie depth in the area is identified in the south, while the shallow depth is located in the northeast and spread toward the southwest. On the other hand, the highest geothermal gradient in the area is identified in the northern part of Moguno, while in the south,                    the lowest, geothermal gradient is located. The highest heat flow in the area is seen in the south-west and north-east, while the lowest heat flow is observed in the south. The high heat flow and geothermal gradient in the area show that geothermal energy could be found in Monguno region of the northeastern Nigeria.

scholarly journals Radioactive Heat Production and Terrestrial Heat Flow in the Xiong’an Area, North China

Energies ◽  
2019 ◽  
Vol 12 (24) ◽  
pp. 4608
Author(s):  
Yue Cui ◽  
Chuanqing Zhu ◽  
Nansheng Qiu ◽  
Boning Tang ◽  
Sasa Guo
Keyword(s):  
Heat Flow ◽  
Heat Production ◽  
Central Area ◽  
Geothermal Resources ◽  
Rock Types ◽  
Terrestrial Heat Flow ◽  
Source Mechanisms ◽  
Lower Heat ◽  
Mantle Heat Flow ◽  
Area North

Herein, integrated heat production analysis in the Xiong’an area was conducted by measuring uranium, thorium, and potassium in different rock types to clarify crust heat flow contribution, simulate the conductive terrestrial heat flow, and illustrate heat source mechanisms of Xiong’an area geothermal resources. The study area was divided into three lithosphere structure types from west to east, and heat production corresponded to layer thickness and heat production with the central area having thicker crust and lower heat production than the eastern and western areas. Crustal heat production, mantle heat flow, and crust–mantle heat flow ratio reveal a ‘cold crust-hot mantle’ in the Xiong’an area.

Building a geothermal formation model using microtremor array measurement

Geophysics ◽  
2021 ◽  
pp. 1-34
Author(s):  
Baoqing Tian ◽  
You Zhiwei ◽  
Guangjie Wang ◽  
Jiangjie Zhang
Keyword(s):  
Heat Flow ◽  
Wave Velocity ◽  
Geophysical Methods ◽  
Correlation Method ◽  
Survey Method ◽  
Geothermal System ◽  
Formation Model ◽  
S Wave ◽  
Geothermal Resources ◽  
Microtremor Survey

A comprehensive understanding of the internal structure and building a geomechanical formation model plays an important role in developing and utilizing geothermal resources. Formation models help in identifying the channel and cycling modes of the heat flow. Due to the urban sprawl and development, constructing a formation model of geothermal resources based on data from traditional geophysical methods is challenging. The Microtremor survey method was adopted to obtain critical information in Jimo, which is famous for rare seawater geothermal resources in China. Three microtremor survey lines were deployed to identify subsurface structures up to 2 km into the ground. Dispersion curves of Rayleigh waves with frequencies from 0.4 Hz to 10 Hz were extracted using the spatial auto-correlation method. An empirical equation was adopted to obtain the apparent S-wave velocity of each survey point, and plot the apparent S-wave velocity sections. The obtained sections reveal the development of two interacting faults. They form a channel for the heat-flow cycle. Two conceptual models were established to depict the formation and cycling modes of seawater geothermal resources in Jimo, based on the results and analysis. The proposed model will help verify the geothermal system and scientifically guide the development of unique geothermal resources . Moreover, the developed model verified that the microtremor survey method is effective and dependable for identifying fracture zones and strata.

Anatomy of the southern Cordilleran hingeline, Utah and Nevada, from deep electrical resistivity profiling

Geophysics ◽  
1997 ◽  
Vol 62 (4) ◽  
pp. 1069-1086 ◽  
Author(s):  
Philip E. Wannamaker ◽  
Jeffery M. Johnston ◽  
John A. Stodt ◽  
John R. Booker
Keyword(s):  
High Temperature ◽  
Heat Flow ◽  
Lower Crust ◽  
Depth Interval ◽  
Inversion Algorithm ◽  
Geothermal Resources ◽  
Low Resistivity ◽  
Curie Depth ◽  
Public Data ◽  
Physicochemical State

To address outstanding questions in Mesozoic‐Cenozoic structure and present‐day deep physicochemical state in the region of the southern Cordilleran hingeline, a detailed, east‐west profile of magnetotelluric (MT) soundings 155 km in length was acquired. From these soundings, a resistivity interpretation was produced using an inversion algorithm based on a structural parameterization. In the upper ten kilometers of the transect, the interpretation shows two segments of low resistivity lying beneath allochthonous rocks of the Late Mesozoic, Sevier thrust sheet. Subsequent industry drilling motivated in part by our surveying confirms the existence and position of the eastern subthrust conductor and, more spectacularly, identifies the presence of yet deeper, autochthonous Mesozoic rocks. The conductors cannot be specified uniquely with present public data, because their electrical characteristics appear consistent with Paleozoic, pyrolized graphitic strata of either Late Devonian‐Mississippian or Middle Ordovician age. However, the drilling results show that Late Paleozoic and younger rocks lie underthrust much farther west than recognized previously, and perhaps as far west as the Utah‐Nevada border. A simple structural interpretation is offered where one underthrust segment of low‐resistivity sediments was created originally, but this segment was broken later into two major ones during higher‐angle Tertiary extension. For the middle and lower crust, the MT data imply a nearly 1-D resistivity structure of remarkable uniformity across the entire transect. In particular, there occurs a deep low‐resistivity layer most pronounced (about 8 ohm-m) in the nominal depth interval of 17.5 to 40 km. The MT data indicate that the layer cannot be confined to a single thin layer in the lower crust but instead represents vertically distributed low resistivity. With temperatures estimated from surface heat flow to range from 550°C to 1050°C with depth in the layer, and with a metaigneous mineralogy of high metamorphic grade assumed, mechanisms to produce the low resistivity can be constrained. The deep layer is thus consistent with [Formula: see text] brines at its upper levels, fluids of lower [Formula: see text] activity toward middle levels, and [Formula: see text] melting below about 30 km. The marked uniformity of the deep conductive layer across the transect suggests a similar uniformity of deep physicochemical state. However, this is not at odds with recent analyses of heat flow, Curie depth, Quaternary extension, and basaltic volcanism. Pre‐existing structural fabrics have had no measureable influence on localizing regions of high temperature, fluids and melting in the lower crust, at least averaged over the scale of tens of kilometers. Given its uniformity over a distance of 155 km or more, the depth to the regional deep conductor does not appear related to the distribution of high‐temperature geothermal resources.

Sign in / Sign up

Export Citation Format

Share Document