Putri, Wendry Anjeli (2025) Study Evaluasi Uncertainty Porositas, Saturasi Air Dan Pengelompokan Zona Lumping Pada Reservoir Sandstone Di Lapangan X. Other thesis, Universitas Islam Riau.

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Abstract

Enhanced to increase well production in oil fields, the initial stage involves geological and geophysical reservoir studies. This study includes petrophysical analysis, which is conducted before reserve calculations in the development of production wells. However, the results of petrophysical analysis have uncertainties since the values obtained from well log interpretation are not always accurate. In this research study, well log data from four correlated wells in Field X across seven formations located in the Central Sumatra Basin were analyzed using Paradigm Geolog software. The methodology employed in this study is qualitative, aiming to evaluate the uncertainty of petrophysical parameters, particularly porosity and water saturation, as well as to perform unit lumping classification. The analysis focuses on petrophysical properties derived from Monte Carlo simulation output to account for variations caused by systematic and model-based errors.Uncertainty evaluation in this study utilizes the Monte Carlo probabilistic simulation method to assess the impact of input variability on final results. The uncertainty analysis of porosity across all formations in each well indicates that the average uncertainty in porosity variation within Formations T_A and T_D, across different percentiles, reaches 1%, while Formations B, E, and F show a variation of 0.7%, Formation T_C 0.9%, and Formation T_G 0.2%. Meanwhile, the variation analysis of water saturation values across different percentiles in all formations ranges between 1% and 4%.Regarding net pay thickness, Formation A ranges from 30ft to 35ft, Formation B from 1ft to 2.5ft, and Formation C from 31ft to 36ft, but in well WA- 003, it is 17ft. Formation D has a net pay thickness of 24ft to 37ft, but in well WA- 004, it is 7ft. Formation E varies between 18ft and 29ft, but in well WA-004, it is xvii 6.5ft. Meanwhile, Formation F ranges from 28ft to 74ft, whereas in well WA-004, the thickness is 4ft.

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