Kumalasari, Isti Nur and Dewanto, Ordas Reservoir Rock Characterization Using Log-petrophysical, geochemical, and Thermal Method on Well I-1 and I-2 in Regions 'Y' Central Sumatra. Reservoir Rock Characterization Using Log-petrophysical, geochemical, and Thermal Method on Well I-1 and I-2 in Regions 'Y' Central Sumatra.

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Abstract

Reservoir characterization is a process to define the qualitative and quantitative characters or reservoir using all existing data (Sukmono, 2002). Reservoir characterization is important to know the subsurface state, especially oil and gas reservoirs. This study used three data and methods to characterization of reservoir wells I-1 and I-2 in Region "Y" Central Sumatra Basin. We used Log-petrophysical, geochemical and Thermal method. Log data Interpretation used for characterizing reservoir located in sand rocks and have great permeability, which can be detected by looking at small gamma ray value and high log spontaneous value. The content of hydrocarbons was detected from log NPHI and RHOB separation and resistivity values (log LLD) of greater than 60 Ohm-m. The results of log data processing indicates that the potential at the Well layer II (614-615.4)m or (2014.4-2016.1)ft has a porosity value = (25.57-35.86)% and Rw = 0:45 Ohm-m, and well I-2 (797- 893.8)m or (2614.8-2932.4)ft has a porosity value = (26.35-29.72)% and Rw = 0:45 Ohm-m. Thermal method (T3D) and geochemistry are used to estimate the hydrocarbon maturation level. Immature indicated by geochemical indicators Ro =(0,34-0,44)%, T3D=(1-2)×103 kal cm-3 and T=(60-70)oC, for wells I-1 occurs at Z=(580-680)m or (1902.89-2230.97)ft Well I-2 occur at Z=(502-629)m or (1646.98-2063.65) ft. Mature indicated by Ro =(0,44-0,73)%, T3D=(10-15)×103 kal cm-3 and T=(90-100)oC, for well I-1 occur at Z=(1160-1270)m or (3805.77-4166.67) ft and for well I-2 occur at Z=(1096-1276)m or (2933.07-3595.8)ft. Over mature only occur at well I-2 (1595-1699m) or (5232.95-5574.15)ft with Ro=0,72-0,91)%, T3D=(50-70) ×103 kal cm-3 and T=(100-120)oC. Gas was found I-2 (1780-1964m) or (5838.90-6443.57)ft with Ro =(1,00-2,00)%, T3D=(100-150)×103 kal cm-3 and T=(110-130)oC. The conclusion is that the wells I-1 and I-2 of Central Sumatra, was the prospect well, because of the addition results obtained porosity and Sw nice (containing hydrocarbons), supported by the thermal data and geochemical showed layers of hydrocarbons immature, ripe and gas.

Item Type:	Article
Subjects:	Q Science > QE Geology
Divisions:	Fakultas Teknik (FT) > Prodi Teknik Geofisika
Depositing User:	ORDAS DEWA
Date Deposited:	05 Jun 2017 03:10
Last Modified:	05 Jun 2017 03:10
URI:	http://repository.lppm.unila.ac.id/id/eprint/3116

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