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Petrophysics is the study and measurement of the physical properties of rocks and the fluids they contain. Well logs and core samples are used to determine reservoir properties such as porosity, permeability and water content. As reservoir engineers, we use these properties to determine the quantity and location of oil and gas reservoirs beneath the earth’s surface.

 

Proven Reserves recommends using petrophysics software to assist the reservoir engineer in identifying pay zones. Petrophysics software is especially helpful in determining new plays which may not be easily identified with standard log analysis.

 

Both open and cased hole evaluation logs can be used in the software. The most important evaluation logs are the neutron porosity, density porosity, deep resistivity, gamma ray, calliper, photoelectric effect and SP curve. The evaluation log readings are imported in the software which assists the reservoir engineer in identifying potential plays based on user defined cut-offs and inputs. The analysis uses cross plots, histograms and log charts to analyze the data and provide an accurate and visual understanding.

 

The software identifies lithology, reservoir parameters and reserves. For reserve estimates, the software has an additional module that can estimate the reserve values. The Monte Carlo Sensitivity Analysis estimates the most likely minimum and maximum reservoir parameters (P10, P90) of the distribution which are used to calculate the P10, P50 and P90 reserve values.   

 

In a recent project, Proven Reserves successfully used petrophysics analysis and identified overlooked gas bearing zones which have added another 2 Million dollars of reserve value to our client.  

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