Interpretation Of Exploration Geochemical Data By Modelling Study And Physico - Chemical Investigations

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Journal Article: Interpretation Of Exploration Geochemical Data By Modelling Study And Physico - Chemical Investigations

Abstract
This paper describes a research study of production characteristics of geothermal waters supplied by well 4797 from Oradea, which has been using for direct heating of blocks of flats. Due to its economic importance, it was considered a necessity to monitor continuously this well. The results represent a part of the researches realised in cooperation with the University of Akureyri from Iceland and University of Oradea, Romania. The chemical composition of the fluid discharged is dependent on the geochemistry of the reservoir. The sampling methods were done according to specific methodology for geothermal fluids and the analysis were done by accurate standard methods, so the chemical results could be used for interpretation. Based on the chemical composition it was made a classification of these waters, it was possible to calculate the deep temperature of the reservoir and were estimated any scaling problems which can appear during well production. The high performance equipment used, made possible to determine the concentrations of trace elements as heavy metals, which may affect people health and the environment. This would be important, because the geothermal water after utilization is reinjected and is good to know if could be any negative impact on the environment. Compared to the maximum recommended values on chemical elements, the heavy metals were found in limits for very low and low probability of effects. Based on the water-rock interaction processes taking place in geothermal reservoir, the temperature of the hot deep water component was calculated by silica geothermometers and compared with the results of silica mixing model. The scaling prediction was realised by using a simulation program which computes the chemical analysis of the extracted waters. It was possible to forecast the behaviour of minerals which could start to precipitate both at the wellhead temperature and at lower temperatures, reached during utilization. One of the predicted deposition was confirmed by structural analysis of the solid sample taken from the exploitation equipment. The utilization of scale additives is a practical method for fighting scaling problems. A technique method to record the efficiency of the additive was successful realised.

Authors 
O. D. Stanasel, H. Kristmannsdottir, G. Gavris and I. Stanasel








Published Journal 
Revista De Chimie, Date Not Provided





DOI 
Not Provided
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Citation

O. D. Stanasel,H. Kristmannsdottir,G. Gavris,I. Stanasel. . Interpretation Of Exploration Geochemical Data By Modelling Study And Physico - Chemical Investigations. Revista De Chimie. (!) .