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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 5 Documents
 1 
Search results for , issue "Vol 35 No 3 (2012)" : 5 Documents clear
Choice Of Water Saturation Model In Log Analysis And Its Implication To Water Saturation Estimates – A Further Investigation Bambang Widarsono
Scientific Contributions Oil and Gas Vol 35 No 3 (2012)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.35.3.782

Abstract

Water saturation is one of the most important governing factors in hydrocarbon in place and reserves estimation. Error in the estimation of water saturation may signifi cantly impose bias in the estimation of both quantities. In spite of there are various factors affecting potential error in water saturation estimation, choice in water saturation model(s) appears to play an important factor. This study involves eight water saturation models that are widely used in log analysis up until today. Using the same input data, the eight models have proved themseleves to have produced different water saturation estimates. Using a moderate level of water saturation error of 20% evaluation may result in up to 50% error in the reserves estimates. Observing the wide disparities in the estimated water saturation values yielded by the models used in this study, errors higher than 50% may take place. This evidence should strengthen our awareness over the potential error and careful applications of model(s) – and validation of results – that have to be observed.
Spectral Filtering For Removing Coal Bright Spot Effect In Seismic Interpretation Saputro R.A; Suprajitno Munadi; Humbang Purba
Scientific Contributions Oil and Gas Vol 35 No 3 (2012)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.35.3.783

Abstract

Gas Sand And Coal Bed Both Give Bright Appearence In Seismic Section. For The Purpose Of Gas Exploration One Has To Differentiate Between Gas Response And Coal Respone. A Spectral Fi Ltering Technique Is Introduced In This Paper To Solve This Problem. This Technique Is The Development Of The Spectral Decomposition Method Which Constitutes The Leading Edge In Seismic Data Analysis.  Testing Using The Real Seismic Data Has Been Carried Out Using The Seimic Data From West Natuna Basin
Australian Palinomorphs From The Buya Formation Of The Sula Island Eko Budi Lelono; Nugrahaningsih Nugrahaningsih
Scientific Contributions Oil and Gas Vol 35 No 3 (2012)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.35.3.784

Abstract

This research has proved the occurrence of pre-Tertiary palynomorphs within the Buya Formation of the Sula Island. Most palynomorphs have Australian affi nity and appear in most Mesozoic basins in Australia and in Papuan Basin of Papua New Guinea. The palynomorph assemblage mostly consists of spores as well as dinofl agellates. Three micro-fl ora zones can be defi ned referring to the existing index spores, including (from older to younger zone) Contignisporites cooksoniae zone, Murospora fl orida zone and Retitriletes watheroensis zone. Meanwhile, four dinofl agellate zones enable to be constructed such as (from older to younger zone) Caddasphaera halosa zone, Wanaea clathrata-Wanaea indotata zone, Dingodinium swanense zone and Criboperidinium perforans zone-younger zone. Both zonations suggest that the age of the Buya Formation is Middle to Late Jurrasic or Bathonian to Tithonian. From the palaeobiogeographic point of view, the similarity between palynomorphs from the Buya Formation of the Sula Island and those from the  Mesozoic sediment of Australia suggests land connection between both areas during Middle to Late Jurassic. It suggests that, during this age, the study area attached the Australian Continent which was situated far South from the equatorial. The study area appears in its recent position during Neogene.
The Effect Of Additional Compressive Stress On The Seal Of Bottle Valve To Reduce The Leakage Rates Of Lpg Supply System I Made Kartika Dhiputra; I Nym Guni Ridhanta; Dimitri R
Scientific Contributions Oil and Gas Vol 35 No 3 (2012)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.35.3.785

Abstract

The leak of LPG system can not be avoided in its uses as domestic fuel which considering it is one of the result from difussion fl ow. The leak because of difusion fl ow in 3 kg LPG tube is mostly caused by Laminar difussion fl ow known by comparing compressive stress with gasket seating stress which value less than 1 with characteristic in exponensial equations. Augmentation of compresive stress is proved in minimizing diffussion fl ow which cause subtraction in leak until 33.18% for NBR seal and 36.43% for vulcanized seal. Minimizing leak caused by increasing compressive stress is very affected by seal material composed representated by AL and nL. Numerical analysis founded that von mises stress received by seal is still under yield strength from rubber material with Factor of Safety (FOS) achieve at 7.08, this condition affi rms that defl ectation happened in Seal in its elastic area with maximum value about 1.326 mm. Beside that, numerical analysis show that difussion fl ow is occurred in seal creating gradation concetration based on the imminent of diffusion contact.
Gambir Extract As A Corrosion Inhibitor For Mild Steel In Acidic Solution Nofrizal Nofrizal
Scientific Contributions Oil and Gas Vol 35 No 3 (2012)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.35.3.786

Abstract

The inhibition infl uence of Gambir extract in 1M Hidrocloric Medium on corrosion of mild steel in acidic solution was studied by weight loss measurements, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and scanning electron microscope (SEM method. It is believed that the phenolic compounds that contained in the Gambir extract in 1 M Hidrocloric medium to be responsible for the inhibition. The corrosion studies shows that Gambir extract gives an anodic type of inhibition and best at the concentration of 150 ppm. The inhibition effi ciency for weight loss measurement, potentiodynamic polarization measurement, and electrochemical impedance spectroscopy were 76.52, 88.28 and 66.27% respectively. SEM analysis shows that the morphology of inhibited mild steel was improved compared with uninhibited mild steel.

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