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All Journal Jurnal Geofisika Scientific Contributions Oil and Gas
Dona Sita Ambarsari
Faculty Of Mining And Petroleum Engineering, Institut Teknologi Bandung
Chemical Engineering, Chemistry & Bioengineering Earth & Planetary Sciences Energy Physics

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Rock Physics Modelling for Estimating the Quality of Reservoir Tight Sand in Bintuni Basin, West Papua, Indonesia Dona Sita Ambarsari; S. Winardhi
Jurnal Geofisika Vol 16 No 3 (2018): Jurnal Geofisika
Publisher : Himpunan Ahli Geofisika Indonesia (HAGI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (972.124 KB) | DOI: 10.36435/jgf.v16i3.386

Abstract

Permeability is a key to determine the quality of reservoir. Reservoir quality can be dened as the ratio between permeability and porosity of a rock. Besides, permeability is not in uenced by porosity solely, there are otherfactors which aect the value of the permeability of a rock. One of them is aected by the pore structure, which includes turtuosity, surface area, and grain size. To determine how much these factors aect the permeability of a rock, it takes an elastic parameters that can be an indicator of the quality reservoir e.g pore space stiness and critical porosity.Primary data such as petrophysics, XRD data, and permeability are used as input data to determine the quality of reservoir. By using Zimmerman's equation and Nur's model, we will get the value of pore space stiness and critical porosity at each point. The combination of rock quality equation derived from Kozeny Carman's with elastic parameters as indicators produces qualitative rock quality identification. Results of this study is able to show that the pore space stiffness and critical porosity can represent turtuosity, surface area, and grain size of a rock which lead to the determination of rock quality. The method proposed in the present study demonstrated an excellence reservoir quality prediction based on the relation between petrophysical parameters with elastic parameters.
The Use of Modified Rock Physics Template to Monitor Fluid Saturation in Carbonate Reservoir Riskiray Ryannugroho; Sonny Winardhi; Djoko Santoso; Mohammad Rachmat Sule; Krishna Agra Pranatikta; Fernando Lawrens Hutapea; Dona Sita Ambarsari
Scientific Contributions Oil and Gas Vol 48 No 2 (2025)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/scog.v48i2.1749

Abstract

Rock physics template (RPT) is defined as a crossplot of acoustic impedance (AI) against the ratio of P- and S-wave velocities that is used for lithology and pore-fluid interpretation of well log data and/or pre-stack seismic inversion results. This study is employing an interactive RPT approach, which facilitates calibration using available data and enhances the interpretation and prediction of pore fluids within carbonate reservoir rocks. A previously established RPT model is modified to construct the rock physics template and to interpret trends in porosity and fluid saturation within a predictive framework. The modified approach to the RPT formulation demonstrates that the proposed model yields more accurate porosity and fluid saturation trends for the reservoir rocks in the study area than the previous RPT model, as evidenced by the theoretical curves in the Rock Physics Template (RPT) domain. To predict fluid saturation, a workflow is developed to build the modified RPT model that incorporates the Curved Pseudo Elastic Impedance (CPEI) and the Pseudo Elastic Inversion for Lithology (PEIL) attributes. These attributes are used to regulate the fluid saturation and density values in the model space and to assist in constructing the RPT model. The proposed method is also applied to monitor fluid saturation changes in oil, gas, or CO₂ cases, utilizing the Vp/Vs ratio and acoustic impedance derived from the seismic inversion data, and allows calibration with available datasets such as well logs and cores.
Co-Authors Djoko Santoso Fernando Lawrens Hutapea Krishna Agra Pranatikta Mohammad Rachmat Sule Riskiray Ryannugroho S. Winardhi Sonny Winardhi