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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 619 Documents
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A Case Study of Primary and Secondary Porosity Effect for Permeability Value in Carbonate Reservoir using Differential Effective Medium and Adaptive Neuro-Fuzzy Inference System Method Reza Wardhana; Amega Yasutra; Dedy Irawan; Mochammad Wahdanadi Haidar
Scientific Contributions Oil and Gas Vol 45 No 1 (2022)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.45.1.923

Abstract

Pore system in a carbonate reservoir is very complex compared to the pore system in clastic rocks. According to measurements of the velocity propagation of sonic waves in rocks, there are three types of carbonate pore classifi cations: Interpartikel, Vugs and Crack. Due to the complexity of various pore types, errors in reservoir calculation or interpretation might occur. It was making the characterization of the carbonate reservoir more challenging. Differential Effective Medium (DEM) is an elastic modulus modeling method that considers the heterogeneity of pores in the carbonate reservoir. This method adds pore-type inclusions gradually into the host material to the desired proportion of the material. In this research, elastic modulus modeling will be carried out by taking into account the pore complexity of the carbonate reservoir. ANFIS algorithm will also be used in this study to predict the permeability value of the reservoir. Data from well logging measurements will be used as the input, and core data from laboratory will be used as train data to validate prediction results of permeability values in the well depths domain. So, permeability value and pore type variations in the well depth domain will be obtained.
Source Rock Potential of Nampol Formation Sumbermanjing Area, Malang, East Java, Indonesia Based on Geochemistry Analysis of the Selected Sample Carolus Prasetyadi; Achmad Subandrio; M. Gazali Rachman; Antu Ridha Falkhan Barizi; Muhammad Muslim
Scientific Contributions Oil and Gas Vol 45 No 1 (2022)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.45.1.924

Abstract

Nampol Formation of the Southern Mountains of eastern Java (Indonesia) has a distribution from its type location in Pacitan to the South Malang area. In the research area, this formation consists of clastic limestone with black shale inserts, claystone, siltstone, carbonate sandstone and claystone which are interpreted to be deposited in a restricted platform interior environment with closed water circulation. A total of three samples were analyzed to evaluate the organic matter content, kerogen type, thermal maturity, and hydrocarbon generating potential. Samples were taken from clastic carbonate deposits of the Nampol Formation. Based on the results of geochemical analysis, the three samples from the Nampol Formation have a TOC content of 3.48 - 26.18 wt% and possess good to excellent hydrocarbon generating potential. Hydrogen Index (HI) values for the studied samples ranged from 43 to 86 mg HC/g TOC and S1+S2 results ranged from 1.52 to 19.55 mg HC/g rock, indicating that the sample has the potential to produce gas. All three samples were dominated by Type III kerogen and were thus considered gas prone based on the HI vs. Tmax diagrams. The three samples were categorized as thermally immature based on Tmax pyrolysis analysis and Vitrinite Refl ectance (VR) values in the range of 0.44 to 0.46 % Ro. Based on the results obtained, the black shale and coal in the Nampol Formation has the capability to generate hydrocarbon but are considered as an immature source rock that can be predicted to produce gas at its peak maturity.
Long Short-term Memory (LSTM) Networks for Forecasting Reservoir Performances in Carbon Capture, Utilisation, and Storage (CCUS) Operations Utomo Pratama Iskandar; Masanori Kurihara
Scientific Contributions Oil and Gas Vol 45 No 1 (2022)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.45.1.943

Abstract

Forecasting reservoir performances during the carbon capture, utilization, and storage (CCUS) operations is essential to monitor the amount of incremental oil recovered and CO2 trapped. This paper proposes predictive data-driven models for forecasting oil, CO2, and water production on the existing wells and future infill well utilizing long short-term memory (LSTM) networks, a deep learning variant for time series modeling. Two models are developed based on the number of phases referred to: 3-phases (3P) and 1-phase (1P), one interest phase at a time. The models are trained on the dataset from multiple wells to account for the effect of interference of neighboring wells based on the inverse distance to the target well. The performance of the models is evaluated using walk-forward validation and compared based on quality metrics and length and consistency of the forecasting horizon. The results suggest that the 1P models demonstrate strong generalizability and robustness in capturing multivariate dependencies in the various datasets across eight wells with a long and consistent forecasting horizon. The 3P models have a shorter and comparable forecasting horizon. The 1P models show promising performances in forecasting the fluid production of future infill well when developed from the existing well with similar features to the infill well. The proposed approach offers an alternative to the physics-driven model in reservoir modeling and management and can be used in situations when conventional modeling is prohibitively expensive, slow, and labor-intensive.
DETERMINATION OF SHALE GAS POTENTIAL OF NORTH SUMATRA BASIN: AN INTEGRATION OF GEOLOGY, GEOCHEMISTRY, PETROPHYSICS AND GEOPHYSICS ANALYSIS Junita Trivianty Musu; Bambang Widarsono; Andi Ruswandi; Himawan Sutanto; Humbang Purba
Scientific Contributions Oil and Gas Vol 38 No 3 (2015)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.38.3.946

Abstract

A detailed combined geological and geophysical study in North Sumatra basin has shown thatprospective formations for shale play containing gas sweet spots are found to be in shales from Bampo,Belumai, and Baong Formations. Bampo Formation exhibits low shale gas potential with very low tomedium in organic material contents, maturity index of immature to mature, and moderate brittleness. Rockswithin the formation tend to be reactive to highly reactive to water, with a moderate degree of swellingcapacity. Porosity varies within 5.8 - 7.4 % with permeability ranging from 0.37 to 3.2 mD. Sweet spots inthe formation found around Basilam-1 and Securai-1wells occupy about 21% of the formation. On the otherhand, Belumai Formation shows moderate to good shale gas potential, with low to high organic materialcontents, immature to mature levels of maturity, and moderately brittle to brittle. Sweet spot areas in theformation found around the two wells are about 29% of the formation. For Baong Formation, analysisreveals moderate to good shale gas potential, with low to medium contents of organic material, immatureto mature in maturity index, moderately brittle to brittle in brittleness, and tendency of being reactiveto highly reactive to water but with low degree of swelling capacity. Sweet spots in the formation foundaround the two wells occupies are roughly 11% of the total formation volume in the area. Basin modelingleading to gas resources estimation for Baong, Belumai and Bampo Formations has led to estimatedvolumes of 6,379 TCF, 16,994 TCF, and 25,024 TCF, respectively, with a total amount of 48,397 TCF.The resources figures are speculative in nature and do not incorporate any certainty and efficiency factors.
THE INFLUENCE OF OLEFIN CONTENT IN GASOLINE AGAINST DEPOSIT BUILD UP ON INTAKE VALVE OF MOTOR BIKE ENGINE Nur Ahadiat; Djainuddin Semar
Scientific Contributions Oil and Gas Vol 33 No 1 (2010)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.33.1.948

Abstract

The specification of gasoline 91, according to Dirjen Migas decree No. 3674 K/24/DJM/2006 dated March,17 2006 define the limit (maximum) of aromatic content 50%volume, and benzene 5.0% volume, but does not define boundary for olefin content as its is regulated in others countries. Olefin compound happened to be saturated hydrocarbon, its has higher octane number, unstable, produces gum that later on could build up as deposit on intake valve of combustion chamber or nozzle tip of fuel injection system. The objective of this study was to know how far the influence of olefin content in gasoline 91 to deposit build-up in intake valve of motor bike engine after cruising on road test for certain distance. For this purpose, the motor bike will be fueled with gasoline 91 with olefin content variations and will be compared to motor bike that cruised at the same route and distance accumulation with regular gasoline 91. Effect of several volume variety of olefin content in gasoline againts deposit development of intake valve engine will be discuss in this paper.
Gas Oil Components And The Effects Of The Changing Gas Oil Quality Requirement A.S. Nasution; E. Jasjfi
Scientific Contributions Oil and Gas Vol 21 No 1 (1998)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.21.1.949

Abstract

The survey of gas oil production and impact of more stringent specification on the catalyst performance of ASEAN refineries conducted in 1996 revealed that a total feedstock of 5,673 MBPSD are processed into 1,131 MBPSD gas oil. This consist of the following product distribution: straight-run gas oil 85.44%, thermal cracked gas oil 2.52% cat. Cracked gas oil 3.50% and hydrocracked gas oil 8.54% on total gas oil products. About 50% of this total gas oil is processed in hydrotreating processes to improve the performanceof diesel oil.This paper reviews the production of gas oil components in ASEAN and the effect of the changing gas oil quality requirement on hydrotreating catalyst performance.
An Indonesian Experience, Consumers’ Demand For Cng Compression Facilities Performance Yusep K Caryana
Scientific Contributions Oil and Gas Vol 21 No 1 (1998)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.21.1.950

Abstract

Compressed Natural Gas (CNG) has been used to fuel vehicles in many countrie, including in Indonesia. However, there are many difficulties to overcome in CNG public acceptance. In Indonesia, one of these may be CNG consumer’s preference for certain CNG refuelling stations over others. Finding causes of this may help increase acceptance of CNG by Indonesian motorists and enable CNG to make a better contribution to achievingthe country’s energy diversification policy. It is hypothesized that the variation in intake pressures at CNG station to be a cause for preference by CNG consumers. This hypothesis is based on the variation in total energy of CNG delivered at the point of sale as a result of CNG compressor capacity. It is found that, when the gas system pressure was less than CNG station intel design pressure, the CNG produced in the fuel tank would not reach its design pressure. Consequently, its total energy per fuel tank and payback period of compression facilities investment was affected.The analysis of CNG acceptance and a correlation with CNG station intel design pressure and gas composition from the consumers’ point of view will examine the following factors:The effect of various intel pressure at CNG stations on the performance of existing CNG compressors and after-cooler.The effect of CNG compressor discharge conditions and after-cooler performance on the total energy of CNG delivered to the fuel tank which in turn affects the heating value of the fuel to the vehicle engines.Evaluation of CNG compressor discharge conditions effecting the payback period of CNG station investment and determination of potential significance to compression facilities acceptance.
Development Of Catalyctic Converter For Unleaded Gosaline Program In Indonesia Oberlin Sidjabat; E. Jasjfi
Scientific Contributions Oil and Gas Vol 21 No 1 (1998)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.21.1.952

Abstract

Recent economic development in Indonesia, as in other ASEAN countrie, has resulted in improved prosperity as reflected by the significant increase in the numbers of motor vehicles, particulary in big cities. This growth in car population and traffic is unfortunately accompanied by increase in not only of the country’s energy consumption but also increased air pollution. Almost 70% of atmospheric pollution in big cities is reported to be contributed by motor vehicles.In view of this situation, the Government of Indonesia has launched the “Blue Sky program” and introduced unleaded gasoline. Indonesia manufacturing industries have responded also by designing “nationalautomobiles” to be fabricated in Indonesia, and to run with unleaded gasoline. Some of these vehicles will be equipped with catalytic converters to reduce exhaust gas emissions.In support of this program, LEMIGAS R/D Center for Oil and Gas Technology is developingits-own catalytic converters that can be fitted into these cars. The work carried out toward this end is outlined briefly in this paper
Co-Generation Technology For High Efficiency Conversion Of Natural Gas Energy In Indonesia D.A. Ismukurnianto
Scientific Contributions Oil and Gas Vol 21 No 1 (1998)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.21.1.953

Abstract

Very high efficiency energy conversion of natural gas can be obtained by simultaneous production of electricity and thermal energy. In industrial countries, this technology has been widely used in various industries, such as pulps, foods, oil refineries, and chemical industries. Moreover, it is becoming very popular and spans a wide spectrum of market, from the relatively small-scale residential and commercial consumers to large industrial plants.In Indonesia, this technology has an open opportunity for application, particulary in support of the country’s energy conservation and “blue sky” programmes. There are obvious reasons of using this technology, the reduction of fuel consumption of about 75%-80%, and the exces electricity production can be sold to the public utility.This paper will generally discuss the technology of gas co-generation, including its characteristic, and the economic and environmental considerations of using gas co-generation in Indonesia.
Application Of Core Analysis Data For Formation Evaluation Herlan Adim
Scientific Contributions Oil and Gas Vol 21 No 1 (1998)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.21.1.954

Abstract

The primary goal of most reservoir evaluation studies is the integration of data from various sources to indentify zones with similar fluid flow characteristic, and to define the areal and lateral continuity of such zones. Core data developed on rock samples recovered from a formation or interest zone which a play vital role in exploration programs, well completion and workover operations and in well and reservoir evaluation. Coring is the only mean of obtaining an actual sample of an oil bearing formation to study. These cores, with proper handling and preservation, are used to obtained data which permit accurate evaluation of the oil or gasreservoirs. This paper presents a practical used of core analysis data for formation evaluation of reservoir hydrocarbon and to provide information that will be of practical value to geologists and engineers involved with the interpretation of core analysis data.

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