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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 7 Documents
 1 
Search results for , issue "Vol 47 No 2 (2024)" : 7 Documents clear
Bioprospecting of Halophilic Bacteria Staphylococcus Haemolyticus Strain Stp-Griv-024 as Biosurfactant Producer and its Potential Application for Microbial Enhanced Oil Recovery Izzul Islam; Cut Nanda Sari; Ali Budhi Kusuma; Ika Kurniasari; Lisnawati Lisnawati; Rini Surya Ningsih; Elisa Rosani
Scientific Contributions Oil and Gas Vol 47 No 2 (2024)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.47.2.1617

Abstract

The use of halophilic bacteria to produce effective and stable biosurfactants in the Microbial Enhanced Oil Recovery (MEOR) process is getting much attention from researchers. A diversity of halophilic bacteria that produce biosurfactants can be found in areas with intense oil exposure, such as the waters of Bima Bay, which is closed and are one of the main sea transportation routes in eastern Indonesia. This research aims to isolate potential local halophilic bacteria in producing biosurfactants to degrade hydrocarbons. The research methodology included bacterial isolation, gram staining, hemolysis test, total petroleum hydrocarbon (TPH) analysis, emulsification, and phylogenetic analysis of the 16S rRNA marker gene. STP-GRIV-024 was successfully isolated using Kish, Halophilic, Soil extract, and Oatmeal agar media, with the highest enumeration results found on Kish media supplemented with 3% (w/v) NaCl. Microscopic morphological characterization using Gram staining showed results as a Gram-positive group with round colony shapes, smooth circular edges, sloping and white. This isolate grew in the 7-15% (w/v) NaCl range and was classified as moderately halophilic. TPH analysis showed that concentration and incubation time influenced hydrocarbon degradation activity. On day 10, the concentrations of T1 (1%), T2 (3%), T3 (5%), and T4 (7%) showed a decrease in TPH of 1.96%, 0.51%, 0.25 %, and 0.15% respectively. 16S rRNA sequencing identified the isolate as closely related to Staphylococcus haemolyticus strain MTCC3383T, with a DNA sequence similarity of 99.9%. These findings provide an important foundation for further development in applying halophilic bacteria in MEOR practices to increase the efficiency of sustainable and environmentally friendly oil production
Pectin Extraction of Jackfruit Peel as a Biopolymer Potential with Microwave Assisted Extraction Method Muhammad Khairul Afdhol; Fiki Hidayat; Tomi Erfando; Dita Putri Purnama
Scientific Contributions Oil and Gas Vol 47 No 2 (2024)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.47.2.1618

Abstract

Polyacrylamide and polysaccharides are commonly used polymers, but they have certain disadvantages. Hydrolyzed polyacrylamide (HPAM) is particularly susceptible to harsh reservoir conditions, including high shear forces, salinity, and temperature. Xanthan gum biopolymer has drawbacks, such as high cost and susceptibility to reservoir biodegradation. In contrast, pectin is a viable alternative owing to its excellent biodegradability, natural decomposition, transparency, good elongation properties, and strong gel-forming ability. In this study, we characterize and analyze the rheology of biopolymers derived from jackfruit skin. Jackfruit peel, a waste product, contains a high pectin content of 23.47%, which can be extracted through microwave assisted extraction (MAE). The MAE method combines microwave and solvent extraction, offering the advantage of a fast extraction time. The resulting biopolymer is expected to enhance water viscosity and meet characterization standards for petroleum applications. FTIR test results reveal the functional groups that constitute the pectin compounds. Biopolymer concentrations used were 1,000, 2,000, and 3,000 ppm. The viscosity values of pectin were 0.503, 0.565, and 0.592 cp, while the viscosity values of xanthan gum were 1.266, 3.096, and 13.13 cp. Pectin has a lower viscosity compared to xanthan gum, and the viscosity of both biopolymers decreases as salinity increases. The reduction in viscosity for pectin during thermal testing was 26%, 28%, and 30%, whereas for xanthan gum, it was 21%, 49%, and 42%. This decrease in viscosity is attributed to the high shear rate and high salinity, which disrupt gel formation. 
Quantifying the Impact of Siderite Composition and Reservoir Resistivity (Rt) on Water Saturation Estimation in Low-Resistivity Sideritic Sandstone Reservoirs Using the Graphic Plot Method Sarju Winardi; Sugeng Sapto Surjono; Donatus Hendra Amijaya; Wiwit Suryanto
Scientific Contributions Oil and Gas Vol 47 No 2 (2024)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.47.2.1619

Abstract

The case studies on low-resistivity-low-contrast (LRLC) reservoirs have started using a conductive matrix model approach based on the assumption that the rock matrix is composed of conductive minerals. The previous studies on reservoir resistivity (Rt) against conductive-minerals-rich sandstone were limited to pyritic types without developing the others such as the sideritic which was found in Indonesia. Therefore, there is a need to determine the relationship between siderite volume within the sandstone reservoir and the reduction number of Rt. Relation profiles were applied to accurately estimate the actual water saturation (Sw) while the resistance of the sandstone samples was determined through the voltage (V, volt) and current (I, ampere). The samples were designed as pseudo-core in the laboratory and simulated to have siderite composition in the range of 0-30% followed by the injection of brine at different saturation conditions. The Rt was calculated through the modification of Wenner and Ohm’s Law and later compared graphically with siderite volume of each Sw line. It was observed from the results that siderite led to an exponential reduction in Rt value. Moreover, the threshold volume of siderite required to reduce Rt significantly to 50% of the original value was found to be 6%. The actual Sw was later estimated simply through the application of the Graphic Plot Method from the curves
The Influence of Side-Slip Velocity on Subsurface Displacement Imam Setiaji Ronoatmojo; Muhammad Burhannudinnur; Yarra Sutadiwiria; Dewi Syavitri
Scientific Contributions Oil and Gas Vol 47 No 2 (2024)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.47.2.1620

Abstract

This research aimed to determine the influence of side-slip velocity on subsurface displacement during seismic data acquisition. Anisotropy constants were used to determine the depth migration process before stack, which showed inadequate results after data validation. Therefore, the forward modeling of a medium, which comprised anisotropy constants of normal and offset raytracing was conducted to address this problem. The configuration of source to receiver were orthogonal and slant. The results showed that the migration process failed to resolve the geological structures of the position shifting. The configuration of source to receiver were orthogonal and slant. The results show the better continuity of slant and the influence of complex geological structures controls the position shifting, which could not be resolved by the migration process. It could be seen from the random distribution of the normal shift of group velocity and phase velocity, as well as the CDP – CRP shift. It produced wave azimuth rotation in a discontinuity plane, such as fault and anticline ridge. This azimuth rotation was strongly suspected to cause inaccurate anisotropy constants implementation in pre-stack depth migration process
Seismic Data Processing and Seismic Inversion in The Ray Parameter Domain: Common Reflection Point (CRP) Stack and Ray Impedance Wahyu Triyoso; Edycakra Immanuel Sinaga; Madaniya Oktariena
Scientific Contributions Oil and Gas Vol 47 No 2 (2024)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.47.2.1621

Abstract

Reservoir characterization can be enhanced by integrating lateral and vertical perspectives from seismic surveys and well logging, respectively. Seismic impedance is a crucial parameter, calculated by multiplying the rock density by the primary (P) wave velocity. While acoustic impedance solely considers these two factors, elastic impedance incorporates additional angular measurements and secondary (S) wave velocity data. Elastic impedance, however, equates the incident angle with the transmission angle in disregard of Snell's law; therefore, it provides a simplified representation of seismic impedance. This study explores an alternative approach to seismic impedance, known as ray impedance. We calculated ray impedance by tracing the impedance variation along the path of a seismic ray, considering its changing velocity and angle as it traveled through different subsurface strata. We transformed the seismic information from the offset space to the ray parameter space, to achieve ray parameter stacking. Unlike the traditional angle domain inversion, which uses near-angle, mid-angle, and far-angle seismic stack data, the ray-impedance inversion utilized segments of ray data: near-ray, mid-ray, and far-ray. We compared the common depth point stack, ray stack, and angle stack methods to infer the acoustic, elastic, and ray impedance characteristics. Challenges with gas cloud interference in seismic data imaging were present. We developed a ray parameter strategy to address these imaging difficulties. The comparison of different stacking techniques indicated that ray stacking could offer an alternative for imaging in the presence of gas cloud effects. Furthermore, impedance cross-plotting demonstrated that ray impedance provided a more discernible separation of low-clay-content zones than elastic impedance did. Overall, data processing in the ray parameter domain yielded positive imaging outcomes in the presence of gas clouds, suggesting that ray impedance is a practical method for lithological differentiation
Modeling The Distribution of Wastewater and Determining Zone of Initial Dilution from Waste Discharge Into The Sea From Fuel Terminal Activities in Balikpapan Bay Randi Andhika; Purwanto Purwanto; Fuad Muhammad
Scientific Contributions Oil and Gas Vol 47 No 2 (2024)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.47.2.1623

Abstract

Sea water quality in Balikpapan Bay is determined by two driving factors: river flow and sea tides. This study aimed to conduct predictive modeling of wastewater distribution from industrial activities with the potential for seawater pollution, specifically for fuel terminals in Balik Papan Bay. The data source used was primary data for the initial environmental baseline, which was taken from the results of the analysis of 1 liter sample each from the wastewater treatment outlet, outfall, and three points representing three sea areas receiving wastewater, and secondary data obtained from the Badan Informasi Geospatial (BIG) and ECWMF (European Center for Medium-Range Weather Forecasts). The tidal data obtained were analyzed using the least-squares method. The results of the wastewater distribution model showed that all parameters, including pH, TSS, BOD, COD, ammonia, fatty oil, salinity, TOC, and Total coliforms, met seawater quality standards both at high and low tide conditions in the West and East Monsoon based on Government Regulation No.22 of 2021 concerning the Implementation of Environmental Protection and Management Appendix VIII for ports
Updated Geochemical Characterization of Hydrocarbon Potential of Surface Sample in Lariang-Karama Sub-Basin, West Sulawesi, Indonesia Yarra Sutadiwiria; Muhammad Taufiq Fathaddin; Imam Setiaji Ronoatmojo; Dewi Syavitri; Cahyaningratri P R; Barona Belladesta; Yeftamikha Yeftamikha; Andy Livsey
Scientific Contributions Oil and Gas Vol 47 No 2 (2024)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.47.2.1624

Abstract

The Lariang-Karama Sub-Basin is situated within the Makassar Basin, located in the West Sulawesi region. It has source of rocks which has the potential to produce hydrocarbons and to become a target for new field discoveries in hydrocarbon exploration activities. It is on this basis that the authors are interested in conducting research in the Makassar Basin area and its surroundings, which has been carried out since 2017. This is a comprehensive literature review study from 2017 to 2022, focusing on the origin and composition of biomarkers, paleogeography of facies sources from oil seeps (2017-2018), paleofacies and biomarker characteristics of Paleogene to Neogene rocks (2019), contribution of terrestrial materials based on geochemical and biostratigraphic analysis (2020), tectonic processes occurring in the basin, and geochemical characterization of source rocks in the research area (2022). The FS-12 surface sample in shale may belong to the Kalumpang Formation, located in West Sulawesi. The results of TOC analysis were 0.62%, indicating sufficient quantity. Based on the results of the cross plot between HI values of < 50 and Tmax of 499 °C, the category was found to be overmature and could not produce hydrocarbons. The results of this research, along with those of previous research and the latest geochemical study, were obtained in the West Sulawesi region and the eastern Makassar Strait. These findings consisted of marine shale source rocks in West Sulawesi and lacustrine shale source rocks in the eastern Makassar Strait

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