Naslov
Određivanje potencijala geotermalnih ležišta s otopljenim ugljikovodičnim plinom
(Determining the potential of geothermal reservoirs with dissolved hydrocarbon gas)

Autori
Gaćina, Marko ; Gregurić Malekoci, Maja ; Jelić- Balta, Jasmina ; Perković, Adaleta

Izvornik
Naftaplin : znanstveno-stručno glasilo Hrvatske udruge naftnih inženjera i geologa (1330-2434) 39 (2019), 159.-160.; 99-109

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, stručni

Ključne riječi
Ugljikovodični plin, geotermalna energija, ležišna simulacija, Monte Carlo metoda
(Hydrocarbon gas, geothermal energy, reservoir simulation, Monte Carlo method)

Sažetak
Since development and growth of geothermal energy is closely related to oil industry, in this paper we evaluate the possibility of geothermal reservoir production in which, in addition to water, a reservoir contains dissolved gas composed mostly of methane and carbon dioxide. Such gas could increase the cost-effectiveness of the development of a geothermal project, especially in its beginnings. The main focus of this work is to provide the required technical parameters such that a technoeconomic analysis could be made for the cost- effectiveness of a geothermal project which utilizes preexisting boreholes, made initially for hydrocarbon exploration. The study utilizes seismic data which was used to determine the reservoir area, well log data for the assessment of various lithologies, layer thicknesses and their porosities. Furthermore, DST analyses were observed from which can be seen that specific layers were saturated with water and gas and the proportion of carbon dioxide and hydrocarbon components varies according to reservoir depth. Since we are dealing with the gas originally dissolved in water, it was necessary to create a reservoir simulation model in order to determine its recovery factor while simultaneously producing gas saturated water and injecting degassed water. Different simulation cases were carried out, covering MIN, MAX and MED petrophysical datasets and are compared to the results of the previously created Monte Carlo model. In addition to the total gas recovery, we also considered the behavior of the reservoir pressure and temperature in a project lifetime of 30 years.

Izvorni jezik
Engleski

Znanstvena područja
Rudarstvo, nafta i geološko inženjerstvo, Interdisciplinarne tehničke znanosti

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