Heat flow map and geothermal resources in Mexico

Heat flow maps are a powerful tool for regional exploration of geothermal resources. Mexico is one of the main producers ofgeothermal energy and the search for undiscovered resources at a regional level should be based on heat flow values. Here, we present a heat flow map at 1:4,000,000 scale, produced with heat flow data compiled from open data bases and previously unpub-lished data. The compiled heat flow data includes bottom hole temperature, temperature logs, transient temperature measurements and measured temperature logs. The new data were calculated from temperature gradient information and estimating a mean con-ductivity value characteristic for the type of rock present in the stratigraphic column or assigning the mean conductivity value for the crust. Geothermal gradient and the thermal resistivity (inverse thermal conductivity) were plotted and heat flow was calculatedusing the Bullard method. The map covers the whole continental territory of Mexico and shows that most of the country has valueshigher than the world average. The highest heat flow values are concentrated in two provinces: the Gulf of California extensionalprovince and the Trans-Mexican Volcanic Belt.

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

10.5194/egusphere-egu21-10257 ◽

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. &#160;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>

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A new database structure for the IHFC Global Heat Flow Database

International Journal of Terrestrial Heat Flow and Applications ◽

10.31214/ijthfa.v4i1.62 ◽

2021 ◽

Vol 4 (1) ◽

pp. 1-14

Author(s):

Sven Fuchs ◽

Graeme Beardsmore ◽

Paolo Chiozzi ◽

Orlando Miguel Espinoza-Ojeda ◽

Gianluca Gola ◽

...

Keyword(s):

Heat Flow ◽

International Association ◽

Open Data ◽

Flow Data ◽

Ocean Drilling Program ◽

Data Set ◽

Data Services ◽

External Data ◽

Database Structure ◽

Starting Point

Periodic revisions of the Global Heat Flow Database (GHFD) take place under the auspices of the International Heat Flow Commission (IHFC) of the International Association of Seismology and Physics of the Earth's Interior (IASPEI). A growing number of heat-flow values, advances in scientific methods, digitization, and improvements in database technologies all warrant a revision of the structure of the GHFD that was last amended in 1976. We present a new structure for the GHFD, which will provide a basis for a reassessment and revision of the existing global heat-flow data set. The database fields within the new structure are described in detail to ensure a common understanding of the respective database entries. The new structure of the database takes advantage of today's possibilities for data management. It supports FAIR and open data principles, including interoperability with external data services, and links to DOI and IGSN numbers and other data resources (e.g., world geological map, world stratigraphic system, and International Ocean Drilling Program data). Aligned with this publication, a restructured version of the existing database is published, which provides a starting point for the upcoming collaborative process of data screening, quality control and revision. In parallel, the IHFC will work on criteria for a new quality scheme that will allow future users of the database to evaluate the quality of the collated heat-flow data based on specific criteria.

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Heat flow map, a review of heat flow data and anomalies for the European plate

Geothermics ◽

10.1016/0375-6505(75)90002-4 ◽

1975 ◽

Vol 4 (1-4) ◽

pp. 3-4 ◽

Cited By ~ 2

Author(s):

E.A. Lubimova

Keyword(s):

Heat Flow ◽

Flow Data ◽

Flow Map ◽

European Plate

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Review of geothermal conditions of Hungary

Földtani Közlöny ◽

10.23928/foldt.kozl.2021.151.1.65 ◽

2021 ◽

Vol 151 (1) ◽

pp. 65

Author(s):

Laszlo Lenkey ◽

János Mihályka ◽

Petra Paróczi

Keyword(s):

Heat Flow ◽

District Heating ◽

Sedimentary Basins ◽

Temperature Data ◽

Geothermal Resources ◽

Flow Systems ◽

The Mean ◽

Flow Map ◽

Temperature Maps ◽

Thermal Conductivities

The heat flow map of Hungary was presented in the Atlas of Geothermal Resources in Europe in 2002 and was last updated in 2005. Since that time several geothermal projects, e.g. TransEnergy (2010-13), assessment of the geothermal potential of the Drava basin (2013) Paks-II, NPP (2016) and continuous drilling activity in the country have been in progress. Large amount of temperature data became available, which allowed the update of the Geothermal Database of Hungary and the compilation of an updated heat flow map and temperature maps. The heat flow is determined based on the Fourier law using the thermal conductivities of rocks and temperature gradient calculated from temperature observations in boreholes and wells. The thermal conductivity is known from laboratory measurements made on core samples. The thermal conductivities and the temperature data are stored in the Geothermal Database of Hungary. The heat flow is calculated in 2001 boreholes and wells using the Bullard-plot technique. The mean heat flow in Hungary is 90 mW/m2, varying between 30 mW/m2 and 120 mW/m2. The high values are found over buried basement highs in the eastern and southern part of the country, while the low values are located in the recharge areas of karstic flow systems. In the sedimentary basins, where the thickness of the Neogene and Quaternary sediments reaches 5-7 km, the heat flow is slightly below the mean value (80-90 mW/m2) due to the cooling effect of sedimentation. These basins contain the main thermal water aquifer in Hungary utilized for district heating and green house heating. The buried basement highs characterized by high heat flow (100-120 mW/m2) are potential sites to create artificial geothermal reservoirs by hydraulic fracturing (EGS). Temperature maps at 500 m, 1 km, 2 km and 3 km depths were also compiled. Similarly to the heat flow, the temperature anomalies strongly reflect the local and regional groundwater flow systems.

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