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Scientific Contributions Oil and Gas
Published by LEMIGAS
ISSN : 20893361     EISSN : 25410520     DOI : -
Core Subject : Science, Engineering,
Chemical Engineering, Chemistry & Bioengineering Energy
The Scientific Contributions for Oil and Gas is the official journal of the Testing Center for Oil and Gas LEMIGAS for the dissemination of information on research activities, technology engineering development and laboratory testing in the oil and gas field. Manuscripts in English are accepted from all in any institutions, college and industry oil and gas throughout the country and overseas.
Arjuna Subject : Energi (semua kategori) - Teknologi Bahan Bakar
Articles 27 Documents
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Search results for , issue "Vol 48 No 2 (2025)" : 27 Documents clear
The Application of Machine Learning (DT-Chan-Performance) in Determining Idle Well Reactivation Candidates at PT. Pertamina EP Regional 4 Zone 11 Cepu Field Sayoga Heru Prayitno; Boni Swadesi; Hariyadi Hariyadi; Damar Nandi Wardhana; Herlina Jayadianti; Geovanny Branchiny Imasuly; Indah Widiyaningsih; Ndaru Cahyaningtyas
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.v48i2.1657

Abstract

Indonesia faces a significant challenge in achieving its goal of oil production 1 million barrels of oil per day by 2030, particularly as it relies on old fields or mature fields (brownfields) to extract remaining hydrocarbons. One of the strategies involves reactivating of idle wells in Cepu field, managed by PT. Pertamina EP Regional 4 zone 11. This study focuses on identifying suitable candidates for reactivation through combination of research, innovation and production-focus analysis. The process begins with problem definition, aiming to understand the factors influencing idle wells and review recent advancements in reactivation prediction. Data were collected from both primary and secondary sources covering period 2018-2023. The next stage is implementing Machine Learning (ML), specifically Decision Tree (DT) model, to overcome problems related to data accuracy and complexity. A web application was developed to support decision-makers in selecting wells with high reactivation potential which can provide the best solution of increasing oil recovery. The research results show a high success rate on Accuracy Under Curve and Receiver Operating Curve score of 0.99, indication strong predictive capability. Using entropy-based analysis, two potential wells were identified for reactivation for improvement. These wells were further evaluated using Chan Diagnostic and Production Performance analysis.
Optimization of CO2 Injection Through Cyclic Huff and Puff to Improve Oil Recovery Dedi Kristanto; Hariyadi Hariyadi; Eko Widi Pramudyohadi; Aditya Kurniawan; Unggul Setiadi Nursidik; Dewi Asmorowati; Indah Widiyaningsih; Ndaru Cahyaningtyas
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.v48i2.1659

Abstract

One of the Enhanced Oil Recovery (EOR) strategies in the petroleum industry is CO2 injection using the huff and puff method. The method is performed on one well that acts as an injection and a production well. The method works by injecting a certain volume of carbon dioxide (CO2) gas into the reservoir and then closing the well for a period of time. This injection cycle can take place over several cycles. Production can be carried out after one or more cycles according to the design. In this study, CO2 injection optimization with the huff and puff method is carried out with reservoir simulation (GEM-CMG) by taking data from one of the oil and gas wells in Indonesia, with carbonate rock characteristics that are water wet. The simulation work steps include inputting data (fluid, rock properties, and production), initialization, history matching, and CO2 injection optimization with the huff and puff method. The optimization scenarios include optimization of injection pressure and number of cycles. The injection pressure scenario uses a range of 500 - 3000 psi, based on the simulation results obtained that the injection pressure of 500 psi produces the highest recovery factor (RF) of 22.2%. Then, the cyclic scenario was carried out at the optimum injection pressure (500 psi) with the number of cycles 2 - 6 cycles. From the simulation results, it is found that the number of cycles for this carbonate reservoir condition does not have a significant effect, as evidenced by the RF values ranging from 22.1 - 22.3%.
A Simulation Study on Polymer Mobility Design Strategies and Their Impact on Oil Recovery Efficiency and Displacement Mechanisms Ndaru Cahyaningtyas; Boni Swadesi; Mahruri Sanmurjana; Muhammad Rizky Rahmadsyah Lubis; Dedi Kristanto; Indah Widiyaningsih
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.v48i2.1661

Abstract

Polymer flooding is an effective enhanced oil recovery (EOR) technique, particularly when waterflooding alone proves insufficient in improving oil recovery. It is prominent to acquaint the principle of mobility control to understand the ability of polymer to overcome the oil displacement inefficiency of waterflooding, a requirement for a better sweep efficiency. This paper presents a comparative study of mobility control methods as critical parameters for polymer design. This paper investigates a simulation study of different simulation model to optimize polymer mobility design by comparing various mobility control methods. In this study, a compositional simulation model was built based on previous laboratory experiments validated by matching simulation results. Furthermore, to visualize the polymer displacement process, this study performs 1D, 2D, and 3D simulation models. The results indicates that polymer mobility design could affect the upstream viscosity, leading to high sweep efficiency and higher oil recovery. The study also suggests that the unit mobility ratio from the existing concept of conventional mobility control has invalid criteria to distinguish favourable and unfavourable conditions. The comparison with various mobility design methods reveals differences in recovery factors, influenced by some factors such as underlying assumptions and the specific conditions favoured by each method.
Binio Formation Characterisation Using Seismic Acoustic Impedance Inversion in the Lotus Field of the Central Sumatra Basin Ni Putu Juliyant Ananda Rika Pangastuti; Mohammad Syamsu Rosid; Edy Wijanarko
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.v48i2.1692

Abstract

The Binio Formation, the target of this study, is located in the Lotus Field, Central Sumatra Basin. P-impedance parameters from acoustic impedance (AI) inversion analysis are used to identify rock lithology and fluid content. Petrophysical analysis was conducted on three wells using well log data to determine reservoir characteristics and identify prospect zones. The reservoir in the Binio Formation is a sandstone that is considered favourable for hydrocarbon accumulation. This study determines lithology, fluid content and reservoir structure. Sensitivity analysis showed that the porosity log parameter is sensitive to lithological separation. A potential hydrocarbon area was detected using seismic methods. Model-based inversion methods showed that the AI values of the sandstone reservoir ranged from 9,670 to 27,070 (ft/s)(gr/cc). The geological structure in the Lotus Field is generally quite complex, consisting of an anticline structure and a normal fault. Following conversion to porosity, the effective porosity value for the P1 reservoir was 0.4 (fraction). The root mean square attribute results showed the presence of bright spots, and the reservoir was clearly detected within the 10 ms analysis window. The prospect zone in the P1 well lies at a depth of 2,400–2,800 ft, with interpretation indicating that the fluid content is gas.
Drilling Effectively in The Target Zone Using a Smart Alert System to Reduce Non-Productive Time in Geosteering Operations Yustian Rahanjani; Budhi Nugraha
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.v48i2.1733

Abstract

This paper discusses the benefits of using a smart alert system for the detection of geological boundaries, and how this system enhances decision making during geosteering operations. Monitoring multiple wells in a high operation environment is a big challenge for geosteering operations. Using Managed By Exception (MBE), an integrated smart system that produces an alert when the well deviates from the target zone while drilling is a solution which can greatly improve operations efficiency. Real-time drilling data is processed through the integrated alert system by a set of algorithms that can recognize when the drill-bit goes out of the reservoir. This is based on Logging While Drilling (LWD) characteristics. The smart system can then recommend if an adjustment in inclination is required to keep the best contact with the reservoir. This creates a seamless geosteering workflow. Geologists and petrophysicists can now leverage a comprehensive understanding of real-time data infrastructure, log formats, and data processing. This fosters effective communication about reservoir condition We believe MBE setup significantly improves geosteering efficiency and encourages others to utilize the power of real-time data analysis.
The Recovery Factor Analysis on Heavy Oil Under Electromagnetic Heating Treatment Gerry Sasanti Nirmala; Diyah Rosiani; Dedi Irawan; Ismail Halim
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.v48i2.1737

Abstract

The use of electromagnetic heating mechanisms in heavy oil production operations is widely limited in Indonesia. In this context, there is a need for in-depth research regarding the effectiveness of the method. Therefore, this research aimed to discuss the efficacy of heating method through Recovery Factor (RF) analysis using imbibition with electromagnetic waves and the addition of nanopowder. The results showed that the speed of heating and RF imbibition using electromagnetic waves was higher than conventional imbibition. In addition, ferrous oxide nanopowder produced the highest heating speed and RF of 38.39% below the expected value. Further research could be conducted regarding changes in the wettability of rock due to electromagnetic heating and nanopowder required to answer the problem.
Geochemical Characteristics of Bintuni Oil Seep, Oil-Oil Correlation, and Oil-Source Rock Correlation Using Biomarker Data in The Bintuni Basin, West Papua Eriko Sabra; Hanif Mersil Saleh
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.v48i2.1740

Abstract

This study conducts a geochemical analysis of oil seepage and its correlation with existing oil and source rock. Biomarker analysis indicates that the Bintuni oil seep likely originates from a Tertiary source rock deposited in a transitional environment under sub-anoxic conditions, with a dominant terrestrial input and experienced slight biodegradation. The sample exhibits Pr/Ph values of 1.48 and 1.49, a dominance of C29 sterane, diasteranes/steranes ratios of 0.83 and 0.84, C29/C30 hopane ratios of 0.39 and 0.43, homohopane indices of 0.01 and 0.02, and high oleanane indices of 0.69 and 0.61. Oil to oil correlation reveals that the Bintuni oil seep is correlated with oil from the Salawati Basin and the Manimeri oil seep. The common characteristics among these three samples include the presence of oleanane, kerogen type II/III, Pr/Ph ratio, and redox conditions. However, differences are observed in the dominant material input: the Bintuni oil seep is dominated by C29, whereas Salawati oil exhibits a balanced C27-C28-C29 ratio, and Manimeri Oil Seep is dominated by C27. Correlation with the Ofaweri-1 oil stain in the Bintuni Basin indicates similarities in the dominance of C29. However, differences exist in the oleanane index and salinity, as the Bintuni oil seep has a higher oleanane index and lacks of gammacerane. Oil to source rock correlation suggests that the Bintuni oil seep shares characteristics with samples from the Klasafet Formation, including type II/III kerogen, a land-plant source, the absence of gammacerane, high oleanane content, and similarly high C29 values. The difference between these two samples lies in the values of tricyclic terpanes, Pr/Ph value, and the oxidizing conditions. The Bintuni Oil Seep has lower tricyclic terpane values, lower Pr/Ph value, and was deposited under more anoxic conditions. The similarity in characteristics with several Tertiary oils and the Klasafet Formation indicates that the Bintuni oil seep likely originates from the Klasafet Formation.
Determining The Role of Ion Exchange in Permeability Alteration During Asp Injection: A Laboratory-Scale Study Using Cmg Reactive Transport Modeling Dike Fitriansyah Putra; Mohd Zaidi Jaafar; Tengku Amran Tengku Mohd; Novia Rita; Agus Dahlia; Ichsan Al Sabah Lukman; M. Haidar T. Putra
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.v48i2.1744

Abstract

Electrokinetic-based Enhanced Oil Recovery (EK-EOR) presents a novel method that applies electric fields to mobilize trapped hydrocarbons in formations with low permeability. This work investigates the impact of ion exchange and mineralogical reactions on permeability behavior during Alkali-Surfactant-Polymer (ASP) flooding, integrating laboratory-scale sand-pack experiments with reactive transport simulation in CMG-GEM. During ASP injection, a marked rise in differential pressure indicated abrupt changes in permeability caused by polymer accumulation, mineral dissolution, and early-stage ion exchange. Two numerical scenarios were assessed: one involving only aqueous-phase chemistry, and another incorporating fluid reactions and solid-surface ion exchange. The latter case required minimal calibration to match experimental data, while the former demanded unrealistic permeability upscaling. The results underscore ion exchange as a vital mechanism influencing fluid transport in EK-EOR. Although wettability alteration is often associated with ASP processes, this study suggests that under short exposure periods, changes in permeability dominate recovery performance. The findings improve reservoir modeling by promoting geochemical integration into simulation workflows.
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.
Economic Analysis of Marginal Oil Field Development by Testing The Feasibility of GVM in Sharia Method Against NPV Muhammad Ariyon; Ellyan Sastraningsih; Siti Nurhayati; Putri Rahmatillah
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.v48i2.1752

Abstract

A marginal oil field (MOF) is a field with relatively small hydrocarbon reserves located at significant depths. This presents major technical and economic challenges for its development. In the Central Sumatra Basin, a MOF with fair development potential has been discovered. The development of this MOF has to be analyzed to determine its feasibility. Previous research has predominantly evaluated oil field feasibility using conventional metrics, such as net present value (NPV) and profitability index (PI). However, assessing feasibility with a Syariah economic approach is an underdeveloped area of study. This study aims to compare conventional and Syariah methods for assessing MOF feasibility. The study involved field observation, primary and secondary data collection, calculation of reserves and oil production, cost estimation, oil price forecasting, and cash flow preparation based on a production sharing contract gross split contract scheme. The economic evaluation was conducted using conventional economic indicators (NPV, internal rate of return (IRR), payout time (POT), and PI) and Syariah indicators, namely, the gold value method (GVM) and gold index (GI). It is found that the development of the MOF is economically feasible. The NPV reached USD 172.27 million, with an IRR of 16.50%, a POT of 3.86 years, and a PI of 1.04. Moreover, the GVM was 10,687.03 grams of gold, and the GI stood at 1.20. This study demonstrates that the results of the Syariah method are consistent with those of the conventional methods, affirming its viability as an alternative evaluation approach for MOF development.

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