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Sigit Rahmawan
Universitas Trisakti
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Journal : Journal of Earth Energy Science, Engineering, and Technology

 1 
The Use of Critical Porosity on Grouping of Rocks Quality of Sandstone Formations Sigit Rahmawan; Ratnayu Sitaresmi; Suryo Prakoso
Journal of Earth Energy Science, Engineering, and Technology Vol. 2 No. 1 (2019): JEESET VOL. 2 NO. 1 2019
Publisher : Penerbitan Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1204.112 KB) | DOI: 10.25105/jeeset.v2i1.4646

Abstract

Research in the classification of rock quality formations has been carried out by many previous researchers with various methods using core sample data. However, from this research there are still many uncertainties that are found due to the difficulty of the data observed. The study uses the critical porosity for grouping the rock quality. The study obtained evidence on the surface conditions of critical porosity values obtained by the Nur method, et al. Using data P and S wave velocity data on measuring core samples surface pressure conditions that produce different rock quality based on different criticcal porosity ranges. Rock type formed based on the critical porosity has a relation to the pore geometry and pore structure that forms the linkages of each rock type. The similarity of the formation of rock types resulting from the value of critical porosity on rock types using the Wibowo and Permadi methods. In this study ten rock types were obtained. With the formation of rock quality groups that are different from the critical porosity values, further research is needed to find out whether the acoustic log in the data log that has P wave propagation speed can be used to determine the critical porosity value and determine the rock quality classification.
Comparison of Rock Type Determination Based on Permeability Estimation and FZI Value in Upper Cibulakan Shaly Sand Formation, ASR Field Anditya Sapta Rahesthi; Ratnayu Sitaresmi; Sigit Rahmawan
Journal of Earth Energy Science, Engineering, and Technology Vol. 2 No. 3 (2019): JEESET VOL. 2 NO. 3 2019
Publisher : Penerbitan Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (520.002 KB) | DOI: 10.25105/jeeset.v2i3.6388

Abstract

Rock permeability is an important rock characteristic because it can help determine the rate of fluid production. Permeability can only be determined by direct measurement of core samples in the laboratory. Even though coring gives good results, the disadvantage is that it takes a lot of time and costs so it is not possible to do coring at all intervals. So that the well log is required to predict the level of permeability indirectly. However, the calculation of permeability prediction using well log data has a high uncertainty value, so rock typing is required so that the calculation of permeability prediction becomes more detailed. This research was conducted in an effort to determine the Hydraulic Flow Unit (HFU) of the reservoir in the well that has core data using the Flow Zone Indicator (FZI) parameter and FZI value propagation on wells that do not have core data so that the type of rock and permeability value are obtained from every well interval. From the results of the study, the reservoirs on the ASR field can be grouped into six rock types. The six rock types each have permeability as a function of validated porosity by applying it at all intervals. After FZI is calculated from log data and validated with core data, it can be seen that the results of the method produce a fairly good correlation (R2 = 0.92). Furthermore, from the permeability equation values for each different rock type, the predicted permeability results are also quite good (R2 = 0.81).
Identification Analysis of Fluid Type in the Low Resistivity Zone of Well Z-2 Field "Z", South Sumatera Sigit Rahmawan; Firman Herdiansyah; Suryo Prakoso; Muhammad Burhannudinnur; Syamsul Irham; Samsol; Muhammad Himawan Prakoso; Hayafa Fakhriyatul Ummah
Journal of Earth Energy Science, Engineering, and Technology Vol. 6 No. 2 (2023): JEESET VOL. 6 NO. 2 2023
Publisher : Penerbitan Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/jeeset.v6i2.17522

Abstract

Hydrocarbon reserves are one of the main points that are very important in the sustainability of the productivity of an oil and gas field. This important point is greatly influenced by several parameters that can be obtained by various measurements and analysis. One of the most influential parameters in the analyses of the amount of hydrocarbon reserves in a reservoir is the water saturation value. The water saturation parameter will also be greatly influenced by the electrical parameters of the fluid-containing rock in the reservoir. Sometimes the electrical parameters of this rock, in this case resistivity becomes one of the benchmark parameters, whether the zone or reservoir has potential or is interesting to be developed or produced. However, there are several reservoirs or zones that experience low resistivity effects which will give an initial indication that the zones or reservoirs are not attractive or have no effect on development. In this Z field, there is a zone that experiences low resistivity effects, making this zone unattractive for production. So to be able to make these zones attractive for production, an identification analysis was carried out on Zones A and B in this Z field to determine the type or type of fluid from the two zones. The initial analysis was carried out petrographically from rock sample incisions at certain depths in Zones A and B so that it is known that the cause of the low resistivity effect in the two zones is the presence of pyrite minerals and illite clay which are the main causes of the low resistivity effect. Furthermore, an analysis of the identification of fluid types was carried out using the double apparent resistivity method with the results obtained that in Zones A and B there are 2 types of fluids, namely hydrocarbons and water with a depth limit of 3650 ft in Zone A and 4558 ft in Zone B. By knowing the type of fluid, the hydrocarbons contained in these two zones should be able to increase interest in the production of these zones as a potential zone for production, but it is necessary to perforate at a depth range indicated by the hydrocarbon fluid and carry out initial production tests to prove the results of the analysis in this study.
Comparative Analysis of Water Injection Patterns and Rates for Oil Recovery Optimization in a Mature Reservoir Wibowo, Djunaedi Agus; Rahmawan, Sigit; Sabirey, Adrian Maulana; Andrianaivo, Lala
Journal of Earth Energy Science, Engineering, and Technology Vol. 9 No. 1 (2026): JEESET VOL. 9 NO. 1 2026
Publisher : Penerbitan Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/1t7py069

Abstract

Waterflooding is one of the most widely applied secondary recovery methods to maintain reservoir pressure and improve oil recovery in mature oil fields. However, ineffective injection patterns and non-optimal injection rates may reduce sweep efficiency and accelerate water breakthrough. Therefore, this study aims to evaluate and optimize waterflood injection patterns and injection rates in Layer Y of Field X using dynamic reservoir simulation with tNavigator. The study employed a full-field black-oil simulation model involving data preparation, model initialization, history matching, and production forecasting under several development scenarios. The evaluated scenarios included base case, infill drilling, and water injection using 3-spot, 5-spot, and 7-spot injection patterns with different injection rates. This study applied the integration of comparative injection-pattern analysis with injection-rate optimization using a validated full-field simulation model for a mature reservoir. The initialization and history matching results showed good agreement between the simulation model and historical field data, indicating that the model was reliable for forecasting purposes. The simulation results demonstrate that waterflood implementation significantly improved reservoir performance compared with the base case and infill drilling scenarios. Among all evaluated cases, the 5-spot injection pattern with an injection rate of 1000 STB/day produced the best performance, achieving a cumulative oil production of 97.36 MMSTB and a recovery factor of 46.76%. The study confirms that optimizing injection pattern geometry and injection rate plays an important role in improving sweep efficiency and maximizing oil recovery in mature reservoirs.
Co-Authors Abdurrachman Assegaf Agusandiva, Putri Daqueentha Amri, Muhammad Adimas Anditya Sapta Rahesthi Andrianaivo, Lala Apriandi Rizkina Asri Nugrahanti Asri Nugrahanti, Asri Bayu Satiyawira Cahaya Rosyidan Djunaedi Agus Wibowo Dyah Ayu Setyorini Fathaddin , M. Taufiq Firman Herdiansyah Firman Herdiansyah Ghanima Yasmaniar Harin Widiyatni Havidh Pramadika Hayafa Fakhriyatul Ummah Hayafa Fakhriyatul Ummah Husla, Ridha Ismanto Ismanto Jonathan Aprilio Salusu Kadarusman, Sunarto Karyo, Faiz Dwinanda Khoirunnisa Nurhanafi Kurniadi, Ahmad Dzikri M. Taufiq Fathaddin M. Taufiq Fathaddin Malinda, Marmora Titi Maman Djumantara Maman Djumantara Maman Djumantara, Maman Mixsindo Korra Herdyanti Muhammad Burhannudinnur Muhammad Himawan Prakoso Mulia Ginting Mulia Ginting, Mulia Nur Chasanah, Anggraita Nurfath Subha Muhammad Nurhayati Octavia, Dione Jessica Oetomo , Hari Karyadi Onnie Ridaliani, Onnie Pantjanita Novi Hartami Puri Wijayanti Putri Daqueentha Agusandiva Rahesthi, Anditya Sapta Rakha Handika Putra Ramadhan Adhitama Ratnayu Sitaresmi Ratnayu Sitaresmi, Ratnayu Ridha Husla Ririn Yulianti Rizkina, Apriandi Sabirey, Adrian Maulana Samsol Samsol Shabrina Sri Riswati Siswahyudianto Subha Muhammad, Nurfath Suherman Dwi Nuryana Suryo Prakoso, Suryo Syamsul Irham Tendi Setiawan Wastu, Apriandi Rizkina Rangga Wiharjo, Lukas Yulia, Prayang Sunny