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Reserve Calculations Lab_NO solution

Reserve Calculations Lab_NO solution - SIMPLE ANTICLINE...

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SIMPLE ANTICLINE Reserve Calculations Exercise 1 The University of Oklahoma Introduction of Geology and Geophysics for

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DEFINITIONS Rock Volume Calculations (A * h): Reservoir volumes can be calculated from net pay isopach maps by planimetering to obtain rock volume (A * h). To calculate volumes it is necessary to find the areas between isopach contours. Planimetering can be performed by hand or computer generated. Given the areas between contours, volumes can be computed using; Trapezoidal rule, Pyramidal rule, and/or the Peak rule for calculating volumes, or GRV (Gross Rock Volume) method. Net pay: Net pay is the part of a reservoir from which hydrocarbons can be produced at economic rates, given a specific production method. The distinction between gross and net pay is made by applying cut-off values in the petrophysical analysis. Net pay cut-offs are used to identify values below which the reservoir is effectively non-productive. In general, the cut-off values are determined based on the relationship between porosity, permeability, and water saturation from core data and capillary pressure data. If core is unavailable, estimation of a cut-off can be derived from offset well information and comparative log signatures. Porosity and Water Saturation: Porosity values are assigned as an average over a zone (single well pool) or as a weighted average value over the entire pay interval using all wells in a pool. Similarly, the average thickness-weighted water saturation using all wells in the pool is commonly assumed as the pool average
Drainage Area: Drainage area assignments to wells should be similar to offset

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Reserve Calculations Lab_NO solution - SIMPLE ANTICLINE...

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