Informace o kvalifikační práci The impact of dolomitization on reservoir performance in carbonate reservoirs of the Middle East. Lessons for better reservoir management practices.
Tato studie byla získána analýzou dostupných dat ze tří vrtů v jednom z uhlovodíkových
polí na jihu Spojených arabských emirátů. Tato studie byla zaměřena na vlastnosti
rezervoáru souvrství Simsima. Pro tento účel byla použita různá data, jako je gama log,
neutron log, logaritmus odporu atd., stejně jako data o tenkém řezu, pórovitosti a
propustnosti vypočítaná z jader. Kromě toho byly nakreslením Lorenzova plánu
identifikovány různé proudové jednotky, které mají zvláštní význam ve formaci Simsima.
Získané výsledky ukazují, že dolomitizace jako komplexní proces diageneze má vliv na
zvýšení pórovitosti a propustnosti ve souvrství Simsima a její nadměrné zvýšení
způsobuje snížení pórovitosti a snižuje kvalitu nádrže. Zkoumáním zakresleného
Lorenzova pozemku je zřejmé, že hranice různých jednotek toku se shoduje s hranicí
různých litologií ve souvrství Simsima, což ukazuje na přímý vliv litologie na kvalitu
nádrže v tomto souvrství.
Anotace v angličtině
The present study was obtained by analyzing the available data from three wells in one
of the hydrocarbon fields in the south of the United Arab Emirates. The focus of this study
was on the reservoir properties of the Simsima Formation. For this purpose, various data
such as gamma log, neutron log, resistivity log, etc., as well as thin section, porosity, and
permeability data calculated from the cores have been used. In addition, various flow
units that are of special importance in the Simsima Formation have been identified by
drawing the Lorenz plot.
The obtained results show that dolomitization, as a complex diagenesis process, has an
effect on the increase of porosity and permeability in the Simsima Formation, and its
excessive increase causes a decrease in porosity and reduces the quality of the reservoir.
By examining the drawn Lorenz plot, it is clear that the border of different flow units
coincides with the border of different lithologies in the Simsima Formation, which
indicates the direct effect of lithology on the reservoir quality in this Formation.
Tato studie byla získána analýzou dostupných dat ze tří vrtů v jednom z uhlovodíkových
polí na jihu Spojených arabských emirátů. Tato studie byla zaměřena na vlastnosti
rezervoáru souvrství Simsima. Pro tento účel byla použita různá data, jako je gama log,
neutron log, logaritmus odporu atd., stejně jako data o tenkém řezu, pórovitosti a
propustnosti vypočítaná z jader. Kromě toho byly nakreslením Lorenzova plánu
identifikovány různé proudové jednotky, které mají zvláštní význam ve formaci Simsima.
Získané výsledky ukazují, že dolomitizace jako komplexní proces diageneze má vliv na
zvýšení pórovitosti a propustnosti ve souvrství Simsima a její nadměrné zvýšení
způsobuje snížení pórovitosti a snižuje kvalitu nádrže. Zkoumáním zakresleného
Lorenzova pozemku je zřejmé, že hranice různých jednotek toku se shoduje s hranicí
různých litologií ve souvrství Simsima, což ukazuje na přímý vliv litologie na kvalitu
nádrže v tomto souvrství.
Anotace v angličtině
The present study was obtained by analyzing the available data from three wells in one
of the hydrocarbon fields in the south of the United Arab Emirates. The focus of this study
was on the reservoir properties of the Simsima Formation. For this purpose, various data
such as gamma log, neutron log, resistivity log, etc., as well as thin section, porosity, and
permeability data calculated from the cores have been used. In addition, various flow
units that are of special importance in the Simsima Formation have been identified by
drawing the Lorenz plot.
The obtained results show that dolomitization, as a complex diagenesis process, has an
effect on the increase of porosity and permeability in the Simsima Formation, and its
excessive increase causes a decrease in porosity and reduces the quality of the reservoir.
By examining the drawn Lorenz plot, it is clear that the border of different flow units
coincides with the border of different lithologies in the Simsima Formation, which
indicates the direct effect of lithology on the reservoir quality in this Formation.
The process of dolomitization involves the replacement of calcium carbonate minerals in sedimentary rocks with dolomite, which is a mineral that is rich in magnesium. This method has the potential to have a substantial effect on the performance of carbonate reservoirs in the Middle East.
Dolomitization may have a number of significant effects, one of the most important being an increase in the porosity and permeability of the rocks that make up the reservoir. This may result in improved reservoir performance because it makes it possible for fluids to flow through the rock matrix with less resistance. However, the extent of dolomitization and the effect that it has on the performance of the reservoir can vary depending on the particular characteristics of the reservoir, such as the original composition of the sedimentary rocks and the nature of the dolomitization process. Both of these factors can have an impact on how well the reservoir is able to store and release hydrocarbons.
This study will evaluate the available data from three oil wells in the Middle East to know the impact of the dolomitization process on reservoir performance
Zásady pro vypracování
The process of dolomitization involves the replacement of calcium carbonate minerals in sedimentary rocks with dolomite, which is a mineral that is rich in magnesium. This method has the potential to have a substantial effect on the performance of carbonate reservoirs in the Middle East.
Dolomitization may have a number of significant effects, one of the most important being an increase in the porosity and permeability of the rocks that make up the reservoir. This may result in improved reservoir performance because it makes it possible for fluids to flow through the rock matrix with less resistance. However, the extent of dolomitization and the effect that it has on the performance of the reservoir can vary depending on the particular characteristics of the reservoir, such as the original composition of the sedimentary rocks and the nature of the dolomitization process. Both of these factors can have an impact on how well the reservoir is able to store and release hydrocarbons.
This study will evaluate the available data from three oil wells in the Middle East to know the impact of the dolomitization process on reservoir performance
Seznam doporučené literatury
1) Ehrenberg, S. N. (2022). The etiology of carbonate porosity. AAPG Bulletin, 106(12), 2351-2386. 2) Omidpour, A., Mahboubi, A., Moussavi-Harami, R., & Rahimpour-Bonab, H. (2022). Effects of dolomitization on porosity–Permeability distribution in depositional sequences and its effects on reservoir quality, a case from Asmari Formation, SW Iran. Journal of Petroleum Science and Engineering, 208, 109348.
Seznam doporučené literatury
1) Ehrenberg, S. N. (2022). The etiology of carbonate porosity. AAPG Bulletin, 106(12), 2351-2386. 2) Omidpour, A., Mahboubi, A., Moussavi-Harami, R., & Rahimpour-Bonab, H. (2022). Effects of dolomitization on porosity–Permeability distribution in depositional sequences and its effects on reservoir quality, a case from Asmari Formation, SW Iran. Journal of Petroleum Science and Engineering, 208, 109348.
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The impact of dolomitization on reservoir performance in carbonate reservoirs of the MIddle East. Lessons for better reservoir management practices
The student presented his bachelor's thesis in a MS PowerPoint presentation.
The reviews of both supervisor (prof. H. Mansurbeg) and reviewer (Dr. P. Spirov) were handled by their authors. The supervisor suggested a grade B. The reviewer pointed out some mistakes and suggested grade C.
In the discussion of the committee members, prf. O. Šráček asked about the Source of used mathematical formulas. Doc. J. Jirásek asked the student to introduce share of his own work and share of review. Student answered all questions sufficiently.
In the public discussion, no question arose.
The committee agreed on an overall evaluation – grade B.