Dewanto, Ordas and Mulyatno, Bagus Sapto and Rizky, Sri and Alimuddin, Muchtar Petrophysical Properties Analysis of Reservoir Rock Using Core Analysis and Interpretation Log Data Method To Estimated The Water Saturation (Sw) at OD-1 and OD-2 Wells in The X-Area. In: PIT HAGI 41.

Text Petrophysical Properties Analysis of Reservoir Rock Using Core Analysis and Interpretation Log Data Method To Estimated The Water Saturation (SW) At OD-1 and OD-2 Wells in The X Area_2016.pdf Download (1MB)

Abstract

The development of reservoir characterization technology highlights the importance of understanding the relationships between the petrophysical properties of rocks, reservoir parameters, and seismic wave parameters. The goal of this study is to evaluate reservoir conditions by analyzing changes in the petrophysical properties of reservoir rocks to determine the amount of water saturation (Sw) and the distribution of oil and gas in the OD1 and OD2 wells using log interpretation and core analysis methods. Porosity (φ) is determined from the cross-plot between the density log (RHOB) and neutron porosity log (NPHI), while water saturation (Sw) is determined using the Archie equation. The core analysis data indicate a tortuosity factor of a = 1 and a saturation exponent of n = 2, which are used as parameters in the Archie water saturation equation. The porosity (φ) of the reservoir rock in the OD1 well ranges from 5.5% to 20%, whereas in the OD2 well it ranges from 4% to 36%. This study uses the Pickett plot method to determine water resistivity (Rw), true formation resistivity (Rt), and formation resistivity at 100% water saturation (Ro) in the water-bearing zone. The results show that, for the OD1 well, with φ = 35%, Rw = 0.11 Ωm, and cementation factor m = 2, the calculated values are Rt = 1 Ωm with Sw = 100%, Rt = 1.6 Ωm with Sw = 80%, Rt = 4 Ωm with Sw = 50%, and Rt = 11 Ωm with Sw = 30%. Meanwhile, for the OD2 well, with φ = 42%, Rw = 0.13 Ωm, and cementation factor m = 2.3, the calculated values are Rt = 1 Ωm with Sw = 100%, Rt = 2 Ωm with Sw = 70%, Rt = 5 Ωm with Sw = 45%, and Rt = 20 Ωm with Sw = 22.4%, and so on. Changes in any petrophysical parameter, including porosity (φ), true formation resistivity (Rt), water resistivity (Rw), cementation factor (m), or tortuosity factor (a), will result in changes in water saturation (Sw). Therefore, changes in the petrophysical properties of reservoir rocks affect Sw, and the distribution of Sw is important for predicting oil and gas reserves within the reservoir rock.

Item Type:	Conference or Workshop Item (Paper)
Subjects:	G Geography. Anthropology. Recreation > GB Physical geography
Depositing User:	BAGUS SAPT
Date Deposited:	31 Aug 2026 03:00
Last Modified:	31 Aug 2026 03:00
URI:	http://repository.lppm.unila.ac.id/id/eprint/54922

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