This paper discusses more than 30 years of experience in auditing and evaluating oil and gas fields and its value in managing risks/uncertainties around the globe. These activities are highly dependent on the quality of the data utilized, especially those of well log data, together with the techniques used in measuring the physical and the fluid properties of both the core data, the interpretation of the well logs, the pressure transient analysis, and the Pressure Volume Temperature (PVT) data of the associated reservoirs.

The importance of using correct data by checking its quality has become one of the most challenging and important tools in reducing risks and uncertainties in recent years. This conclusion has been based on the fact that while auditing and evaluating oil and gas fields around the globe in the past 30 years, a vast majority of the data that I have observed has been found to be compromised. Moreover, it was also observed that while analysis was highly dependent on the quality of the data utilized, the interpretation procedures accordingly requires accurate input data (like in the case of log interpretation, pressure transient analysis or even core and PVT analysis), and these analysis were found to have serious errors on parameters involved in calculating important reservoir parameters and constructing geological models required for future reservoir development and reservoir management.

Field examples to show the size of the damages created by using unchecked data quality will be exhibited in this study especially in heterogeneous reservoirs. How to accurately calculate important reservoir parameters with field examples will also be illustrated, and the effects of such techniques in reducing uncertainties by calculating oil and gas reserves will also be addressed.

Summary and suggestions of ideal methods will be included in our assessment of data to better describe reservoirs, constructing better geological models, calculating oil and gas reserves and reducing risk and uncertainties; and thus, calculating accurate overall recovery factors.

It may be concluded from this publication that since these techniques has been a significant factor in either enhancing or reconstructing a better and accurate geological model used in most of the studies which were carried out by the author in each field evaluation around the globe, I am highly confident that Egypt might benefit by using the same principals to better describe their reservoirs and accurately construct their geological models.

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