Integrirani hidrogeološko-hidrokemijski model Daruvarskog geotermalnog vodonosnika

doctoral thesis

• Title: Integrirani hidrogeološko-hidrokemijski model Daruvarskog geotermalnog vodonosnika : doktorski rad
• Title (english): Integrated hydrogeological-hydrogeochemical model of Daruvar geothermal aquifer : doctoral thesis
• Author: Staša Borović https://orcid.org/0000-0002-5821-8964; MBZ: 319282
• Mentor: Andrea Bačani (mentor)
• Committee member: Tomislav Kurevija (predsjednik povjerenstva)
• Committee member: Andrea Bačani (član povjerenstva)
• Committee member: Tamara Marković (član povjerenstva); MBZ: 256192
• Granter: University of Zagreb; Faculty of Mining, Geology and Petroleum Engineering; Zagreb
• Defense date and country: 2015-07-03, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mining, Petroleum and Geology Engineering; Geological Engineering
• Universal decimal classification (UDC): 55 - Geology. Meteorology. Hydrology

Abstract

Temelj ove disertacije je istraživanje Daruvarskog geotermalnog vodonosnika i prirodnog izvorišta temperatura do 50 °C. Oni su dio hidrotermalnog sustava razvijenog u tektoniziranim i okršenim trijaskim karbonatima. Sistematizacijom i obradom podataka iz prethodnih geoloških, hidrogeoloških i geofizičkih istraživanja utvrđeno je da se radi o strukturno-tektonski predisponiranom hidrotermalnom sustavu vezanom uz strike-slip tektoniku koja je prisutna na užem i širem području istraživanja te su izračunati hidrogeološki parametri vodonosnika pomoću podataka iz pokusnih crpljenja. U sklopu geotermijskih istraživanja utvrđen je blago povišeni geotermalni gradijent u okolici Daruvara koji odgovara regionalnoj geotermalnoj anomaliji Panonskog bazena (40 °C/km) te lokalna geotermalna anomalija u samom Daruvaru uzrokovana cirkulacijom geotermalnih voda, koje konvekcijom topline gradijent podižu na 69 °C/km. Prikupljeni su i uzorci stijena koje čine podinu istraživanog prostora, mjereni su njihovi termički parametri te je utvrđeno da imaju povoljna svojstva za kondukciju topline. Izvršene su kemijske analize uzoraka voda koje jasno ukazuju na vapnenačko-dolomitnu litologiju vodonosnika, uz trošenje silikata, na anoksične uvjete u vodonosniku te miješanje s vodama iz plićih vodonosnika na prostoru izvorišta, dok su geotermometrima predviđene ležišne temperature od 75-90 °C. Izotopna istraživanja ukazuju na meteorsko porijeklo voda i prihranjivanje prije otprilike 9000 godina. Na temelju prikupljenih podataka o sustavu provedene su 2D simulacije toka vode i topline u programu HYDROTHERM koje su omogućile bolji uvid u njegovo funkcioniranje te vrijeme i mjesto prihranjivanja vodonosnika. Primjenom interdisciplinarne metodologije omogućeno je rafiniranje konceptualnog modela hidrotermalnog sustava. Razvijena metodologija može se koristiti u istraživanju geotermalnih vodonosnika u razlomljenim karbonatnim stijenama koji su brojni diljem svijeta, a prihranjuju i najveći broj prirodnih geotermalnih izvorišta u Hrvatskoj.

Abstract (english)

This doctoral thesis describes the research of Daruvar geothermal aquifer and natural springs (50 °C). They are a part of hydrothermal system developed in fractured and karstified Triassic carbonates. By analyzing data from previous geological, hydrogeological and geophysical research it was found that the system is structurally controlled and related to strike-slip tectonics that is present in Daruvar and wider area of research, and hydrogeological parameters of the aquifer were calculated from existing pumping test datasets. In the scope of geothermal research an elevated geothermal gradient was determined in the area surrounding Daruvar, corresponding to the regional geothermal anomaly of the Pannonian Basin (40 °C/km), and local geothermal anomaly in Daruvar caused by geothermal water circulation, which increases geothermal gradient by convection to 69 °C/km. In addition, samples of rocks which comprise the structural fabric of the study area have been collected, their thermal parameters were measured and it was found they have favourable heat conduction properties. Chemical analyses of water samples were performed and they clearly point to limestone-dolomite aquifer, presence of silicate weathering, anoxic conditions in the aquifer and mixing with water from shallow aquifers in the area of natural springs, while geothermometers predict reservoir temperature of 75-90 °C. Isotopic studies indicate meteoric origin of the water and 9000 years residence time. Based on the collected data 2D simulations of water and heat flow in the program HYDROTHERM were carried out, which enabled a better insight into system functioning and time and area of aquifer recharge. By applying interdisciplinary methodology it was possible to refine and constrain the conceptual model of Daruvar hydrothermal system. This methodology can be applied to the exploration of geothermal aquifers in fractured carbonate rocks which are frequent worldwide, and also supply the majority of natural geothermal springs in Croatia.

• Keywords: hidrotermalni sustav; hidrogeološke funkcije rasjeda; hidrogeološki parametri; termički parametri; hidrogeokemija; numerički model; konceptualni model; Daruvarski geotermalni vodonosnik
• Keywords (english): hydrothermal system; hydrogeological functions of faults; hydrogeological parameters; thermal parameters; hydrogeochemistry; numerical model; conceptual model; Daruvar geothermal aquifer
• Language: croatian
• URN:NBN: urn:nbn:hr:169:539261
• Promotion: 2015-09-27
• Study programme: Title: Applied Geosciences, Mining and Petroleum Engineering; Study programme type: university; Study level: postgraduate; Academic / professional title: doktor znanosti/doktorica znanosti (doktor znanosti/doktorica znanosti)
• Catalog URL: http://katalog.nsk.hr/F/?func=direct&CON_LNG=ZAG&local_base=ZAG01_WEB&doc_number=611085
• Type of resource: Text
• Extent: 227 str ; 30 cm
• File origin: Born digital
• Access conditions: Open access
• Created on: 2017-11-22 13:48:52