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Abstract Unlike the petroleum which has been awaking the attention of the Romanian scientists since the end of the XIX-th century (Pilide, C.L.-1877, Cobalcescu, G.-1887) and the beginning of the XX-th century (Poni, P.-1900-1901 Edeleanu, L.-1907), geochemistry have been developing since `80 years and especially after 1990, when theoretical considerations joined modern technologies for oil and rock analyses. Today we are at the same level like similar laboratories in the world because of the results obtained with the new generation tools. There are relatively little geochemical information published in the last years on the characteristics of oils and their potential source rocks from Romania. This paper presents the first detailed data for oils from the western part of Romanian Getic Depression. It used gas-chromatography-mass spectrometry to obtain various biomarker ratios and isotopic analysis. The Getic Depression constitutes the Tertiary foredeep developed in front of the Southern Carpathians and it lies from Dambovita Valley (in the east) to the Danube River (in the west), whereas in the south, down to the Pericarpathian Fault which delimits it from the Moesian Platform. For this work we selected the western part of Getic Depression between Jiu River (West) and Cerna River (East). 57 oils were analyzed after the fractionation into saturated hydrocarbons, aromatic hydrocarbons and nitrogen, sulfur and oxygen (NSO) compound fractions, in order to get the distribution of the biomarkers. The results of these investigations were been evaluated and interpreted using the new PC Soft: IGI. We characterized the various oil families in more detail, observing a special and interesting case of one of the analyzed fields (Ticleni) and we say now, that we better understand the petroleum system in the studied area.
The basic partial differential equations that describe the multiphase flow of fluids through multidimensional porous media have been well known for over 30 years. However, it was not until high speed digital computers became widely available that the solution of these equations became possible. It is the various complexities introduced by flow geometry and phase behaviour that have created three general approaches to simulation of petroleum reservoirs. The first approach is to use various techniques for solution of the multiphase flow equations assuming that the fluid properties of the oil, gas and water are functions of pressure only and that the flow occurs through the porous media according to Darcy's law. The second approach is to add the additional complexity of simultaneously solving the phase relationships so that the movement and phase of individual molecular species is accounted for. The third general approach is to introduce the additional complexity of flow both through porous media and through fractures. All three approaches have a common goal-to mathematically simulate the behaviour of a petroleum reservoir so that various production strategies can be investigated and the maximum recovery of petroleum obtained. All authors of the five official papers agree that the use of petroleum reservoir simulation is leading toward optimal recovery of hydrocarbons and therefore conservation. Two papers were presented on the application of solutions of the fundamental flow equations. G. IOACHIM et al. reported the application of solutions to the fractional flow equations for simulation of complete water drive and pressure maintained reservoirs. This technique was applied to forecast oil production and recovery from a line drive water flood pilot test in the Sarmatian reservoir, Videle Field (Romania). Discussion centred on the accuracy with which the model predicted actual performance. The AUTHOR stated that insufficient data were obtained to be able to monitor all parts of the solution. However, the water-oil ratio information indicated that a satisfactory match was obtained. The history of the Sarmatian reservoir, Balteni Field (Romania) was used as an example to indicate satisfactory agreement between the forecasting technique and actual field results. N. R. MONTEIRO presented the second paper on application of the fundamental flow equations. A two-dimensional, three-phase simulation was performed to model the solution gas drive natural depletion of the Sao Paulo 4 reservoir, Miranga Field, Block 2 (Brazil). A satisfactory match was obtained of the natural depletion observed in the field. The importance of obtaining good pressure and fluid production data was shown. Data shown in the prese