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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 Method For Generating Plane Wave And Zero-Offet Vsp Synthetic Seismograms Suprajitno Munadi
Scientific Contributions Oil and Gas Vol 8 No 1 (1985)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.8.1.900

Abstract

Synthetic Vertical Seismic Profiles (VSP) seianograms are a useful aid to the interpretation of VSP re- conds, Plane wave VSP syntherics multiples and mode conversions can be computed rapldly n the frequency domain using a new recursive formulation. The method urilises the concept of "renultanz" phase related reflection and tranamission coefficients for a layer atack. High frequerncy signals can be handled with relative euse. The ability to control the order of the multiple avolds wraparound problems with the discrete Fourier transform. Several examples are used to lhustrate the method with relewance to seismic exploration.
Offshore Exploration For Hydrocarbons In Indonesia Dr. B Situmorang
Scientific Contributions Oil and Gas Vol 8 No 2 (1985)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.8.2.901

Abstract

Indonesian offshore areas in 1985 are still the loci of an active exploration program.  Exploration activities are anticipated to be at the same level as in 1984. A new ofl field in the East Java Sea (the Madura field) began production in September 1985 with initial production of 10.9 MBOPD.  The month of August 1985 is marked by the significant oil and gas discovery in the Banggai basin, offshore East Sulawesi, where the Tlaka-1 exploratory well flowed 3864 BOPD (29° API) and 1.1 MMSCF gas (60 ppm HS) from  Middle Miocene plat-form carbonates.  Together with exploration drillings in the area beyond the continental shelf which have been started since February 1984 such as in the area north of Lombok, the discovery will encrease enthusiasm for exploration of the frontier areas especially in the geologically complex reglon of Eastern Indonesia.  It also reveals that potential accumulation of hydrocarbons could also occur within the collision complex.
A Study On Octane Requirement For Motor Vehicles In Indonesia F. Batti W Kaslan
Scientific Contributions Oil and Gas Vol 7 No 1 (1984)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.7.1.902

Abstract

The knowledge of the exact level of octane number required for the car population in a country is quite important both for the petroleum refiners and the consumers. If the actual gasoline octane number is too high, the use of a superfu- ous anti-knock represents a loss for the refiners; on the contrary, if the octane level is too low, knock will result and risks of engine damage may occur. Various factors affecting the octane requirement of the car such as engine design, atmospheric conditions, service life of the car are reviewed. The octane level needed could only be assessed by actual measurements on cars representing the various type of cars in the country. Two consecutive studies for the requirement of the car population in Indonesia were carried out in 1978 and 1982 respectively, are described, and the results of the measurements of both studies are expressed octane requirement curves.
Occurrence Of Tar Pollution Along Some Shores In Indonesia J. Bilal B Prasetyo; G. Bodennec L. Loubersac M. Joanny
Scientific Contributions Oil and Gas Vol 7 No 2 (1984)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.7.2.903

Abstract

Four typicul Indonesian costr : Jakarta Bay, Malacea and Makussar Strats, as well as South coart of Yogyakurta, Central Java, were nurveyed in August 1982 and May 1984 with the purpose of assessing, quantifying and identifying tar stranded thereon. The estimution of tar pollution was determined using a typical statistical methodology bated on a stratifled rundom sampling Quantitative beach sampling conducted in Augar 1982 during the East monuoon season yielded avenage stranded beach tar concentrations nanging from less than 1 gim to about 2.800gim (values in grost weight) of shoreline. The vuhuer obtutned in May 1984 after the West monsoon ranged between 2,8 and 9.500 g/m. In the two nunveys, the most polhuted area was located in the Kepulaun Seribu area (Jaharta Ray) Average tar weight of over 2 kaim beach are comparuble to that of other couut along major tanker routes as Kuwait or Benmuda Obuerved tur pollution in Aulae Kapal Besar , labon Kecil, Nirup, Pelampong and Takong Kecl (in the Straits of Malacca) and Langga Beach (on the Straits of Makussar) war lower during these nurveys. The reason why inapite of such dense marine traffic is not clear, until one examines the internal current circulation between the islands, the local geopaphical feutwes of the site and preferen tial wind directions.
1982 3rd Ascope Laboratories Test Correlation Programme On C.F.R. Engine Bustani Mustafa; E Jasjfi
Scientific Contributions Oil and Gas Vol 6 No 1 (1983)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.6.1.904

Abstract

During the 2nd Workshup on the ASCOPE Laboratory Test Correlation Programme which was, held in Kuala Lumpur 17 - 18 August 1981, the following consensus was reached among participating laboratories : • The frequency of the correlation test programme should be increased to twice a year. • Testing should be carried out at the same day and time specified by the Programme coordinator. • Testing should be carried out according to the same procedure (bracketing Method). Member countries taking part in this correlation programme are Indonesia as coordinator with seven laboratories participating, Malaysia with one laboratory, Thailand and the Philip- pines with two laboratories each. The coordinator in this correlation programme is respon- sible in preparing the correlation samples and sending them by air to each participating laboratory. The first part of this programme (3rd Correlation Programme) was started by sending samples in January 1982 and the second part (4th Correlation Programme) was starting by sending samples in March 1982. It will appear in the next publication. After being tested by the participating laboratories, the test result are to be sent to the coordinator for the determination of the standard deviation and other statistical data. Based on these results, conclusions can be drawn about the deviation of laboratory test results and about outliers to be rejected. For better analysis of the results, for each of the samples for correlation it is also required to report physical and chemical tests such as specific gravity, R.V.P., distillation and lead (TEL) content in the receiving laboratories. This is necessary in order to take into account any possible changes in the sample properties which might have occured during transporta- tion and storage. Also to be observed are ambient and engine operating conditions during the correlation tests. The results of this analysis can then be used as a base for deviations the occurence of outliers and recommendation of remedial steps to be taken. d The method used for testing the samples is the bracketing method, while for rounding the value of the member found during the tests the ASA rules for rounding are used. SADIM The Grubb's rejection criteria with the use of "T" factors is used in evaluating the possible outliers. • Presented by the Indonesian Technical Committee to the Workshop on ASCOPE Laboratory held in Bangkok, Thailand, 9- 11 October 1982.
Hydroisomerization Of Paraffin Wax Of Sumatran Light Waxy Residue For Lubricating Oil And Fuel Oils Production Using The BI - Functional Catalysts With Various Acid Supports A.S Nasution
Scientific Contributions Oil and Gas Vol 5 No 1 (1982)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.5.1.905

Abstract

Paraffin wax (average mol wt 750-850) of Sumatran Light Waxy Residue was hydroisomerized by bi-functional catalyst with various acidic com- ponents, using a catetest unit, operated at high temperature and pressure with continous system . The reaction products were distilled at at- mospheric pressure to 380°C and the residues subjected to a dewaxing treat ment at - 20°C. Based on this separation the reaction products were regarded as pseudo three component systems the component being lubricating oil, unconverted wax and cracked products. The lubricating oils obtained in the experiments have a-viscosity index of 122- 16S, With M/AI0-SIO2 type catalyst a maximal oil yield of 28,0 per cent wt was obtained with 25 per cent of cracked products. And at 50 percent by wt of feedstock conversion, the smoke point of kerosene and diesel index of gas oil are 34 and 87 mm respectively. The wux contents in the feedstock is an important source for high viscosity index lubricating oil produC tion obtained by hydroisomerization of this wax.
The Miocene/Pliocene Boundary In The North East Java Basin, Indonesia Soemoenar Soeka; Suminta Suminta; Siswoyo Siswoyo
Scientific Contributions Oil and Gas Vol 5 No 2 (1982)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.5.2.906

Abstract

As a part of the LEMIGAS Research Programme on Neogene Epoch Boundaries in the Indonesian Tertiary Basins, in 1981 fiscal year is selected North East Java Basin as an object for research. In this paper we will stress our work on the Miocene/ Pliocene Boundary of the basin based on planktonic Foraminifera. More recently a lot of paleontologists have been working on the Miocene/Pliocene Boundary problem. Bandy (1963) used the first appearance of Sphaeroidinella dihescens as a boundary in the Phillipine, whereas boundary based on the initial apppearance of Globoratalia margaritae. carried out an examination of samples from the Trubi Marl of the Zanclean Sicily and came to the conclusion approximately with middle N18 of this zonal scheme. Bolli ( 1966, revision in 19/0 ) put this stage In 1969, Blow Berggren (1973) proposed the limit of this stage boundary based on the last occurrence of Globoquadrina dehiscens. Kaneps (1974) based on this observation on planktonic Foraminifera of the DSDP cores from the Eastern Equatorial Pacific Ocean came to the conclusion that the Miocene/Pliocene Boundary lies at the base of Globoratalia tumida zone. The base of this zone was placed at the horizon of the initial appearance of Globoratalia tumida while the upper boundary was placed at the horizon of reversal in coiling direction of Pulleniatina primalis from left below to right above. Pringgoprawiro and Baharuddin (1979) on the other hand proposed the initial appearance of Sphaeroidinella immatura as a boundary between these two periods. The purpose of this paper is to study the ranges of some selected important species, and to detect how far these species can be used as a tool for Miocene/Pliocene Boundary in the North East Java Basin. No radiometric age dating has been done in the area.
The Feasibility Study of Reservoir Geomechanics from Brittleness Evaluation Benyamin Elilaski Nababan; Harnanti Yogaputri Hutami; Fatkhan Fatkhan; Sonny Winardhi
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.45.1.920

Abstract

A detailed understanding regarding the rocks Brittleness Index is helpful in oil and gas exploration as upfront information to determine the rock fracture gradient. Researchers have proposed several methods to estimate the rock Brittleness Index. However, different ways may yield different results and lead to varying interpretations regarding the Brittleness Index classifi cation. This paper evaluates the Brittleness Index of an Indonesian gas well using three approaches based on the elastic properties log data, elastic properties rock physics modeling, and mineralogical rock physics modeling to assess the consistency of the methods. The results obtained in this study suggest that elastic properties-based and mineralogical methods produced a consistent Brittleness Index. However, the vertical resolution is different. It indicates that the Brittleness Index estimated from the actual log data showed higher resolution than the Brittleness Index calculated from the rock physics modeling. Combining TOC data with the Brittleness Index is recommended to optimize hydraulic fracturing design and planning. For further investigation, the authors will be suggesting direct sampling from cores and laboratory measurements to obtain the in-situ mechanical properties of shale rocks.
Strategy Formulation of Natural Gas Continuity Supply (Case Study PT ABC) Dhanu Saptowulan; Idqan Fahmi; Bagus Sartono
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.45.1.921

Abstract

This study aims to formulate a strategy for PT ABC in maintaining the continuity of natural gas supply. Feasibility analysis and decision tree method are used to determine the chosen strategy in maintaining the continuity of natural gas supply. Internal and external analysis are used to identify the key success factors of the company in implementing the chosen strategy and then summarized and evaluated using IFE and EFE matrix. To formulate implementation strategies by aligning key internal and external factors, IE and SWOT matrix are used. QSPM matrix is used to determine the priority of the implementation strategy. The results show IFE and EFE score are 2.55 and 2.76 respectively, so that PT ABC has suffi cient internal resources to maintain the continuity of natural gas supply and able to respond well to opportunities and threats. This condition can be managed best with hold and maintain strategies which are market penetration and product development. QSPM Matrix analysis show that product development group strategy has the highest Total Attractiveness Score (TAS) thus become priority to be executed and then market penetration strategy.
Build of Machine Learning Proxy Model for Prediction of Wax Deposition Rate in Two Phase Flow Water-Oil Jalest Septiano; Amega Yasutra; Silvya Dewi Rahmawati
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.45.1.922

Abstract

Wax deposit is one of the major fl ow assurance experienced in the process of oil production and transportation from sub- surface to surface. Large amounts of data are required to perform modeling using existing thermodynamic models such as carbon number data from HGTC. In this paper, a machine learning algorithm using unifi ed model approach from Huang (2008). Two types of input are implemented in order to simulate infl uence of feature selection used in training and testing machine learning which are input A consists of water volume fraction (fw), shear stress (τw), effective viscosity (μe), wax concentration gradient (dC/dT), and temperature gradient (dT/dR) and input B consists of water volume fraction (fw), shear stress (τw), effective viscosity (μe), wax concentration gradient (dC/dT), temperature gradient (dT/dR), shear stripping variable (SV) dan diffusion variable (DV). The random forest with Ntree = 500 known to be the best machine learning method compared to others. Based on accuracy parameter it achieves error parameter R-squared (R2) for training, testing and total data for input A and B are 0.999, 0.992, 0.9975 and 0.999, 0.993, 0.9977, respectively.

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