far too complicated too answer thru this media mate.....suggest you book yourself into a Petroleum Engineering masters and Curtin uni - they will sort you out! Or if you haven't the time for a masters, UNSW runs a 5 day short course. Many parameters/measurements to consider for figuring out gas/oil reserves in place i.e.
Reservoir analysis. -The analysis of how much and over what period oil and gas reservoirs will produce. Different types of petroleum reservoirs. - Crude oil, natural gas and condensate reservoirs. Reservoir rock properties. - Defining the critical rock properties such as porosity, saturation, permeability, relative permeability and capillary pressure, understand their significance and look at open hole logging, cased hole logging and coring to estimate these properties. Again we will emphasise the uncertainties in making these estimates. Reservoir fluid properties. - Measurement of fluid properties in the laboratory is generally quite reliable. However, uncertainties arise due to difficulties in obtaining representative reservoir fluid samples. We will define the important fluid properties and examine ways of obtaining reliable samples and analysis results. Material balance. - Calculating the balances of fluid volumes produced from a reservoir. Fluid displacement. - Fluid Flow and Fluid Displacement in a porous medium is the second fundamental calculation methodology which describes the relationship between flow rate and pressure drop of the various fluids flowing within a petroleum reservoir. Reservoir simulation. - Reservoir simulation is, in principle, a very simple but powerful tool that solves the material balance, fluid flow and equation of state simultaneously and describes the processes occurring in different parts of the reservoir by dividing the reservoir into thousands of small cells. We shall discuss the strengths and weaknesses if the technique and understand the circumstances in which it should be applied. Forecasting oil and gas production. - Methods used to estimate the rate of production each year in the life of an oil or gas field how much oil and gas will be produced.
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