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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 716 Documents
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Dual-porosity-Permeability Modeling in Carbonate Reservoirs: A Review on Characterization Techniques,Modeling Approaches, and CCS Applications Khalisha Shafa Yumnanisa; Siti Nur Fathiyah Jamaludin; Numair Ahmed Siddiqui; Jun Matsushima; Alidu Rashid; Jamaluddin
Scientific Contributions Oil and Gas Vol 49 No 3 (2026)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/scog.v49i3.2170

Abstract

Carbonate reservoirs are extremely heterogeneous owing to fractures, vugs, micropores, and karst features. This heterogeneity complicates fluid-flow prediction, characterisation, and simulation in both naturally fractured reservoirs and carbon capture and storage (CCS). Dual-porosity modeling remains the dominant approach for capturing matrix–fracture interactions in these systems. This review critically assesses geological, petrophysical, geophysical, and dynamic characterization techniques alongside conventional dual-porosity, dual-permeability, MINC, DFN, and hybrid continuum–discrete methods for carbonate reservoirs, with emphasis on CCS applications. Case studies from Central Luconia and Abu Dhabi demonstrate that dual-porosity workflows outperform single-porosity approaches in multiscale pore-system characterization, permeability prediction, and dynamic behavior forecasting. Nevertheless, significant uncertainties persist regarding fracture connectivity, multimodal pore networks, interporosity transfer functions, and history-matching non-uniqueness, directly impacting CO₂ injectivity, plume migration, and long-term containment security. The review further examines advances in digital rock physics, machine-learning-assisted workflows, uncertainty-aware simulation, and coupled thermal–hydraulic–mechanical–chemical modeling. Though no single framework is universally applicable, future progress depends on improved multiscale characterization, rigorous uncertainty quantification, coupled multiphysics simulation, and computationally efficient workflows that balance geological realism with practical field-scale implementation.
Is The α–β Quartz Transition a Significant Contributor to Porosity Generation in Unconventional Crystalline Hydrocarbon Reservoirs? A review Eduardo Antonio Rossello; Marcos E. Mozetic
Scientific Contributions Oil and Gas Vol 49 No 3 (2026)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/scog.v49i3.2171

Abstract

This study evaluates the potential contribution of differential thermal contraction between quartz and feldspars to secondary porosity generation during cooling of quartz-bearing crystalline rocks. We reassess and extend the thermomechanical framework proposed by Rossello and Gallardo (2026) by integrating its quantitative model with published thermal-expansion data and experimental evidence for thermally induced microfracturing in granite. The model predicts theoretical thermally induced porosity of approximately 0.4–1.2%, depending mainly on quartz abundance and the contrasting thermal behaviour of quartz and feldspars. The β→α quartz transition at approximately 573–575 °C at atmospheric pressure produces a marked change in the thermal and elastic behaviour of quartz and may contribute to differential strain and damage within the crystalline framework. However, experimental studies demonstrate that thermal microcracking begins over a broader temperature range, commonly before the quartz transition, and may subsequently propagate and coalesce during thermal evolution. The calculated porosity therefore represents potential secondary pore space rather than directly measured effective reservoir porosity. Its reservoir significance depends on subsequent tectonic deformation, fluid circulation, fracture reactivation, and preservation of fracture connectivity. The results support differential thermal contraction, including the β→α quartz transition, as a potentially significant contributor to the initial development of secondary porosity in quartz-bearing crystalline rocks and provide a testable framework for evaluating fractured basement hydrocarbon reservoirs.
Process Simulation and Optimization of Green Hydrogen Production from Rubberwood Sawdust Pellets Via Gasification Using Unisim Design for Oil Refining Basuki Rahmad Saleh; Irdam Ahmad; Herlina Juni Risma Saragih; Agus Adriyanto; Abdul Rozak Kodarif; Fauzi Yusupandi; Damayanti; Muhammad Rifqi; Hanif Fawaz Za’im; Yazid Bindar
Scientific Contributions Oil and Gas Vol 49 No 3 (2026)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/scog.v49i3.2172

Abstract

Indonesia pushes to expand renewable energy to create growing interest in low carbon hydrogen. Rubberwood processing generates large volumes of sawdust that are commonly pelletized for fuel, offering a locally available biomass feedstock for hydrogen rich gas production. This study evaluates the potential of producing green hydrogen from rubberwood sawdust pellets through gasification using process simulation. Feedstock properties were determined through proximate and ultimate analyses and implemented in a two stage simulation framework consisting of pyrolysis followed by gasification. The model was validated against published experimental data for steam gasification of wood residue, and the deviation between predicted and reference gas compositions was evaluated using the root mean square error. After validation, sensitivity analyses were conducted at a gasifier temperature of 700 °C for three gasifying agent configurations: steam only, steam with air, and steam with oxygen. Under steam-only operation, increasing S/B from 0 to 1.0 increased H₂ from approximately 44 to 56 mol%, while HEE increased from about 27 to 36% and LHV decreased from about 11.4 to 8.6 MJ/Nm³. Under steam plus air, increasing S+E/R to about 1.0 reduced H₂ from approximately 56 mol% to near zero while CO₂ increased from about 30 to 85 mol%. Under steam plus oxygen, increasing O/B to 1.0 reduced H₂ from approximately 56 to 22 mol% and increased CO₂ from about 30 to 73 mol%. Overall, the results indicate that steam rich and oxygen lean operation is the most favorable pathway for enhancing hydrogen rich gas production from rubberwood sawdust pellets and provide a simulation basis for selecting operating conditions to support national energy resilience.
Effect of KOH Concentration on Biodiesel Production from Waste Cooking Oil: Comparison of Batch and Microchannel Reactor Claudya Debbie Retnosatuti Retnosatuti; Afiq Mohd Laziz; M. Devendran; Ehsan Zhalehrajabi
Scientific Contributions Oil and Gas Vol 49 No 3 (2026)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/scog.v49i3.2178

Abstract

The quality of biodiesel produced from waste cooking oil (WCO) is confirmed by compliance with the ASTM D6751 standard specification to ensure the products meet commercial fuel standards. Compared with batch reactors, microreactors offer several benefits, including reduced residence time, lower specific energy consumption (SEC), and improved processing of low-quality WCO feedstock with high viscosity and free fatty acid (FFA) content. However, a knowledge gap remains regarding the capacity of reactor systems to handle highly degraded WCO feedstock while complying with ASTM D6751, especially total glycerin limits (≤ 0.240 wt%) and minimum ester content. In addition, comparative data between batch reactors and microchannel reactors for low-quality oil processing remain limited. This research aims to establish an evaluation framework for assessing reactor tolerance to highly degraded WCO feedstock by comparing the performance of batch reactors and microchannel reactors under slug flow conditions. Results indicate that the microchannel reactor, with an 80-second residence time, achieved a peak FAME conversion of 98.2% under optimal conditions (1.0 wt% KOH, HH oil) and consistently maintained high conversion (91.1%-98.2%) across all tested feedstocks. Conversely, the batch reactor, with a one-hour reaction time, achieved a conversion of only 68.2%- 88.4% and could not reach the high FAME content required to exceed the total glycerin limit based on ASTM D6751 (> 1.0% berat). The SEC of the microchannel reactor was also 98.96% lower than that of the batch reactor. Consequently, the microchannel reactor demonstrated superior efficiency compared to the batch reactor in transforming lower-quality WCO into biodiesel that meets the ASTM D6751 standard in terms of FAME conversion, energy efficiency, and processing time. Future research may explore the design and optimisation of microchannel reactors for industrial-scale applications, as well as test a wider range of WCO quality variations to establish a more stable and sustainable biodiesel production system.
Geochemical Correlation of Gas and Condensate from The Lower Seurula Reservoir with Potential Source Rocks in The North Sumatra Basin Wiendra Akhmad Faridsyah; Very Susanto
Scientific Contributions Oil and Gas Vol 49 No 3 (2026)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/scog.v49i3.2179

Abstract

Recent exploration activities in Block “B” of the North Sumatra Basin, including the acquisition and processing of 610 km² 3D seismic data followed by a two-well exploratory drilling campaign, led to gas and condensate discoveries within the Late Miocene sandstone reservoirs of the Lower Seurula Formation. The campaign targeted two structures: Arun Overburden (AOB), located above the Arun Structure, and Rayeu. Previous studies have focused primarily on the giant Arun and SLS Fields due to their substantial hydrocarbon reserves. Consequently, direct evidence for the source rock charging reservoirs younger than the Early Miocene Peutu Formation carbonates was lacking. Gas and condensate samples from the newly discovered Rayeu CA and AOB-1 wells, along with samples from the Arun and SLS fields, were acquired and subsequently analyzed in the laboratory. Characterization and correlation of both source rock and hydrocarbon samples are the most appropriate methodologies for evaluating their genetic relationship. Although condensates from Arun and AOB-1 exhibit retrograde phase behavior, reliable geochemical interpretations and correlations were obtained. The results indicate that gas and condensate from both Peutu carbonate and Lower Seurula sandstone were generated from a highly mature source rock dominated by algal organic matter, with only a minor contribution from higher plants. These findings suggest that multiple reservoir objectives in “B” Block, particularly in the Lhok Sukon Deep sub-basin, most consistently correlated with a mature Bampo-type marine shale source facies.
Netback Value Assessment of Indonesia's Natural Gas Sector: Implications for Domestic Market Obligation and Industrial Gas Pricing Policy Retno Gumilang Dewi; Bintang Yuwono
Scientific Contributions Oil and Gas Vol 49 No 3 (2026)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/scog.v49i3.2183

Abstract

Indonesia manages a persistent tension between the role as a major Liquefied Natural Gas (LNG) exporter and its policy commitment to affordable domestic industrial gas. This tension is mediated through a layered regulatory stack comprising Domestic Market Obligation (DMO), which requires producers to reserve about 25% of output for the home market, a price ceiling for priority industrial sectors (Certain Natural Gas Price (Harga Gas Bumi Tertentu, HGBT)) currently US$6.50–7.00/MMBtu, and an allocation mechanism, Specific Industrial Gas Allocation (Alokasi Gas Industri Tertentu, AGIT), governing physical delivery. Therefore, this study aimed to develop a netback valuation model, comparing wellhead value across LNG exports, domestic regasified-LNG, and HGBT-regulated pipeline routes under consistent cost and fiscal assumptions to analyze policy-price wedge. The model estimated that HGBT-directed gas yields producers approximately one-quarter to one-third of the wellhead value achievable through export or regasified-LNG sales. This wedge has widened as international and ICP-linked benchmarks rose while the statutory HGBT rate remained comparatively static. The results showed deteriorating physical realization of HGBT allocations, implying the statutory price increase does not reflect the amount industrial users pay. Consequently, the underlying policy problem is shifting from price-setting toward allocation enforcement and infrastructure investment. This study has significant implications for HGBT fiscal sustainability, upstream investment incentives, and gas value chain strategy. It proposes a netback-indexed pricing formula alongside stronger DMO or AGIT enforcement as design responses.

Page 72 of 72 | Total Record : 716

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