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All Journal Indonesian Journal of Electrical Engineering and Computer Science Indonesian Journal of International Law LEMBARAN PUBLIKASI MINYAK DAN GAS BUMI Scientific Contributions Oil and Gas
Bambang Widarsono
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POROSITY VERSUS DEPTH CHARACTERISTICS OF SOME RESERVOIR SANDSTONES IN WESTERN INDONESIA Bambang Widarsono
Scientific Contributions Oil and Gas Vol 37 No 2 (2014)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.37.2.629

Abstract

Porosity is a petrophysical property that always draws attention due to its central role in determiningstorage capacity of hydrocarbon reservoirs. Accuracy for predicting porosity in reservoir affects much ofmany petroleum production related activities. Accordingly, various attempts have been devoted to study andmodel rock porosity including its relation with depth. In this study porosity data from as many as 4654 coresamples (1773 full-diameter core plugs and 2881 sidewall core samples) is used. The core samples were takenfrom 549 wells in 222 fi elds/structures located in eight producing sedimentary basins in western Indonesia.Main results of the study are facts that existing porosity-depth models derived from data obtained from otherregions are not usable for Indonesian cases, and therefore porosity-depth models are established for theeight sedimentary basins. It is hoped that these models can contribute signifi cantly to the understanding ofrock porosity trends with depth in western Indonesia.
Single or Multiple Porosity Cut Off A New Relevance Provided By Application of A New Approach Bambang Widarsono
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.33.1.643

Abstract

Porosity cut-off is one of the most important parameter normally used to differentiatebetween reservoir and non-reservoir rocks. Quantity of the parameter certainly dictatesreservoir volumes, hence directly influences economics and commerciality of a given oil/gas field. An ever critical issue in relation to this parameter is whether the use of porositycut-off has to be established through a single or multiple values especially for heterogeneousformation rocks. This certainly may lead to different reservoir sizes along with thetechnical and economical consequences. The study presented in this article is meant to furtherinvestigate this question. The thrust of this study lies on the application of a newlyproposed method for determining porosity cut-off. It is put that with this new and reliablemethod – compared to the traditionally used method – a more conclusive answer can beachieved. For the purpose, a heterogeneous limestone reservoir in West Java – Indonesiais used. Evaluation, analysis, and application of the new method on data from the field’seight wells have shown that multiple porosity cut-off values are needed for better definitionsof reservoirs. Application of a single value for these reservoirs can still be regardedas unrepresentative. The fact underlines that – despite the new approach’s reliability –heterogeneity governs more over the use of either single or multiple cut-off values ratherthan limitations of method. The study also proves that the new method for determiningporosity cut-off works well for highly heterogeneous reservoir rocks.
RESERVOIR QUALITY REDUCTION CAUSED BY CLAY INDUCED DUCTILITY Junita Trivianty Musu; Bambang Widarsono
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.33.1.659

Abstract

Ductile components including rock fragments, clay, and matrix material are often consideredas the most important factors that control quality of shaly sandstones, which are usually characterized by low porosity and permeability. In presence of ductile components, the degree of quality reduction is affected mainly by distribution, occurences, and amounts of the ductile components. Therefore, the presence of ductile components affects rock petrophysics, and consequently has effect on fluid movements in reservoir during production. This paper presents results of the study on plug samples taken from five wells from various fields in Cooper Basin (Tirrawarra Sand), South Australia. The samples were studied petrographically using x-ray diffraction, optical petrography, and scanning electrone microscope. The results were integrated with routine and special core analysis data. The overall results show that the distribution and the amount of ductile components have significantly reduced porosity, hence the quality of the reservoir. However, the effect is different for different types of porosity, and this certainly is valuable addition to our understanding over permeability behavior of shaly sandstones.
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.
Technology Challenges In Indonesia Oil And Gas Development Maizar Rahman; Suprajitno Munadi; Bambang Widarsono; Yusep K Caryana
Scientific Contributions Oil and Gas Vol 34 No 1 (2011)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.34.1.787

Abstract

This paper presents the challenges in oil and gas development in Indonesia, especially in technical aspects. In upstream, this country faces the fact that the production as well as the proven reserves of oil is continuing to decline. The challenges are therefore on how to find new resources, how to develop frontier area and how to produce more oil from the remaining oil in place in the existing fields. The oil deposit and traps are small, but also complexes. Very limited primary data makes it difficult to have a discovery. More accurate, intensive and comprehensive exploration data are therefore needed which, in turn, will need the use of the most sophisticated exploration technology. On the other hand it isrecommend that Government of Indonesia should generate primary exploration data prior to oil and gas prospecting. Regarding production, there is still hope to maintain the production level by exploiting further the remaining oil in place, the effort of which will need the use of advanced technology. The future of EOR application in Indonesia is bright and steps have been taken towards the objective. However, some important technical matters should still be overcome. In petroleum refining Indonesia faces increasing demand, the need of lighter products, more stringent fuels specifications, demand increase of petrochemical products, old and low complexity existing refineries and not sufficient margin for developing new refinery. The development of new refineries seems a must from the view of energy security. However, low margin should be overcome by appropriate strategy such as integration with petrochemical and employing more efficient technology. Some challenges that need to be considered in gas development in Indonesia include increasing gas demand,more gas reserve offshore, scattered gas consumers, limited infrastructure, not optimal domestic utilization and weak willingness to pay. Several technological approaches should be done to overcome those challenges.
Irreducible Water Saturation And Its Governing Factors: Characteristics Of Some Sandstones In Western Indonesia Bambang Widarsono
Scientific Contributions Oil and Gas Vol 34 No 1 (2011)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.34.1.788

Abstract

Irreducible water saturation (Swirr) plays a very significant role in the estimation of hydrocarbon in place and reserves. Inaccurate Swirr and lack of knowledge for judging its accuracy may result in erroneous and misleading reserve estimates along with its consequences. This study is basically aimed at understanding of Swirr characteristics of reservoir sandstones in some fields in western Indonesia. For the study, data obtained from 1,334 core samples – taken from 78 fields in 10 sedimentary basins – is used. Observations and investigations are made in sedimentary basin, field, and formation scales. The main finding is that rock wettability plays a very significant factor in determining Swirr characteristics, in a manner more than what rock pore types and configuration do. Its variation – be it contrasting or difference in strength – influences the Swirr characteristics in its relation to rock permeability. It is also found that geological similarity and geographical proximity do not have effects on Swirr characteristics unless they directly affect the rock’s overall wettability. This occurs not only at higher scale of sedimentary basin but also at lower levels of field and rock formations. The study also produces permeability - Swirr correlations for both sedimentary basins and rock formations levels. The overall results of this study is an understanding that gross simplification in assuming reservoir general wettability has to avoided in order to prevent erroneous picture over a field’s most representative Swirr characteristics.
Rock Wettability Characteristics Of Some Indonesian Limestones Case Study: Baturaja Formation Bambang Widarsono
Scientific Contributions Oil and Gas Vol 34 No 2 (2011)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.34.2.796

Abstract

Rock wettability plays a very important role in affecting various rock physical properties such as relative permeability and capillary pressure. Common practice at present is that carbonate rocks are assumed to be preferentially oil wet in nature. This assumption may prove fatal since the need of true knowledge over the real wettability for one’s carbonate reservoir is often neglected, and wettability aspect in reservoir modeling is in turn based on assumption. To prove over reliability of the assumption a study is carried out using information from 350 core samples taken from Baturaja Formation. The choice for the Baturaja limestone is basically based on the fact that it is a mature productive rock formation and its extensive spread into three of the most productive sedimentary basin in Indonesia, Northwest Java Basin, South Sumatra Basin, and Sunda Basin. The study proves that the assumption of the generally oil wet limestone does not apply for Baturaja limestone. The Baturaja limestone tend to exhibit, quantitatively, equality in their tendency towards oil wettability and water wettability and leave some proportion to neutral or mix wettability as well. However, when a more detailed comparison is made results show that qualitatively the limestone are indeed more inclined to oil wettability than water wettability even though this finding is insufficient to support a conclusion that the Baturaja limestone are specifically oil wet. Other finding from comparison with past studies also shows that limestone may behave in the way sandstones do. Both limestone and sandstones may vary in the same way and no assumption over their preferential wettability is justified without direct measurements. Wettability alteration as the result of hot core cleaning following the widely accepted standard procedure is also strongly indicated. It is therefore concluded that the practice has to be abandoned for a better and reliable laboratory testing results.
The Importance Of Litho-Facies Distinction In Determining The Most Representative Cementation Factors For Well-Log Evaluation : An Old Issue Persistently Neglected Bambang Widarsono
Scientific Contributions Oil and Gas Vol 34 No 2 (2011)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.34.2.800

Abstract

Cementation factor is a parameter always required in any conventional open-hole log analysis leading to determination of water saturation. Considering the central of water saturation in the estimation of hydrocarbon in place and reserves, any error in the use of the parameter may prove fatal. A common practice in the oil industry is that acquisition of laboratory-derived cementation factor has never been given a proper attention. It occurs very often that too few samples – hardly represent the rocks of reservoir of concern – are assigned for laboratory test. The practical use of the parameter in the log analysis also often draw question, in which un-representative cementation factor is arbitrarily used due to lack of the data. The effect of this practice has long been known but is often neglected – with all of its consequences – up to present day. This study tries to revive the awareness through presenting a fact that cementation factor may vary due to differences in litho-facies characteristics. Formation resistivity factor data from forty-seven limestone coreplug samples were taken from a West Java (WJ) field. Visual description over the samples has shown that they belong to several litho-facies types. Results of the study have mainly proved that different litho-facies type may have significantly different cementation factors. An averaging effect is also obvious when data from all samples are processed collectively. The effect of improper use of cementation factor is shown through the application of three water saturation models through which erroneous water saturation estimates are produced. The finding of the study is again hoped to reinforce the awareness of the use of proper and representative cementation factor
Improving Accuracy Of Fluid Contact Determination Through The Use Of An Auxiliary Transform Method Bambang Widarsono
Scientific Contributions Oil and Gas Vol 34 No 3 (2011)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.34.3.802

Abstract

Fluid contact(s) in reservoir sets the lower limit above which an accumulation of hydrocarbon (i.e. oil or gas) has the maximum level of mobility under a specific circumstance. This mobile hydrocarbon determines the reservoir’s production feasibility. In this light, an accurate knowledge over position of fluid contact contributes to accuracy in the estimation of initial hydrocarbon in place and its corresponding reserves. Determination of fluid contact in reservoir may utilize any available sources of information but well pressure survey data is usually regarded as the primary source of information. Despite the importance, the data is sometimes not in ideal condition usually marked by absence in clear change of pressure gradient and/or data scatter for various reasons. The use of Hough transform – as introduced by Kang and Xue (2009) – for supporting fluid contact detection can solve the problem. In this study, the method that is usually used for, among others, recognizing regular shapes in images has been successfully applied for fluid contact detection. The study uses three sets of data with different level of difficulty, and the technique proves to work well for the all cases. The study also shows that the Hough transform can be used reliably in a simple way without employing the full weight of it.
Differential Strain Analysis: An Investigation Over Its Feasibility For Determining Coal’s Cleat Orientation Bambang Widarsono
Scientific Contributions Oil and Gas Vol 33 No 2 (2010)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.33.2.813

Abstract

Gas production from coal bed methane (CBM) has been rising as supplement to conventional gas reservoirs. Effective CBM production is much determined by well placements with regards to orientation of the coal reservoir’s face cleat. This is true since this cleat type provides the main path of fluid migration from storage to wellbore. It is therefore imperative to understand and determine the general orientation of the cleats of concern. This information is usually obtained from visual description on core samples, and whenever available from analogy to outcrop data. This is considered as insufficient and a means for studying core sample’s interior is required in order to ensure consistency between external and internal appearances. This paper presents an investigative study over the possibility of differential strain analysis (DSA) technique to serve the purpose. The technique is normally used for measuring subsurface in situ stress field, and through the use of a similar basic concept it is proposed to be used for determining orientation of face cleats in coal samples. The study includes utilization of DSA data obtained from measurements on samples taken from great depths. Review and re-working over the data has shown that the technique can well indicate the orientation of face cleats. A general orientation over all tested samples is also indicated with reasonable degree of reliability. This leads into conclusion that the DSA technique can be well used to indicate cleat orientation and therefore help in better characterizing coal.
Co-Authors Anda Lucia Andi Ruswandi Arie Rahmadi Atmoko, Heru Atyanto D Atmoko Aziz M Lubad Bambang A Widjayanto Caryana, Yusep K Danang Sismartono Desi Yensusminar Diana Dwiyanarti Djoko Sunarjanto Endras Pribadi Fakhriyadi Saptono Hadimuljono, Jonathan Setyoko Hazman Hazman, Hazman Herru L Setiawan Herru Lastiadi Herru Lastiadi Setiawan Heru Atmoko Heru Atnioko Heru Atnwko Heru Riyanto Himawan Sutanto Himawan Sutanto, Himawan Humbang Purba Humbang, Purba Ida Ayu Putu Sri Widnyani Jonathan Setyoko Hadimuljono Julikah Julikah Julikah Julikah, Julikah Junita Trivianty Junita Trivianty Musu Kosasih Kosasih KOSASIH KOSASIH, KOSASIH Kosasih Sartadiredja Lucia, Anda Maizar Rahman Mendrofa, Merkurius F Merkurius F Mendrofa Merkurius. F. Mendrofa Mohamad Romli Musu, Junita Trivianty Nurkamelia Nurkamelia, Nurkamelia Ongki Ari Prayoga Panca Wahyudi Pasarai, Usman Patrick M Wong Prayoga, Ongki Ari Pribadi, Endras Rahman, Maizar Ridwan Ridwan Ridwan Ridwan, Ridwan Romli, Mohamad Rosidelly Rosidelly Rosidelly Rosidelly, Rosidelly Rudi Suhartono Ruswandi, Andi Saptono, Fakhriyadi Sartadiredja, Kosasih Septi Anggraeni Setiawan, Herru Lastiadi Sugihardjo Sugihardjo Sugihardjo Suhartono, Rudi Sukarno, Panca W. Suliantara Suliantara Suliantara Suliantara, Suliantara Sunarjanto, Djoko Sunting Kepies Suprajitno Munadi Suprajitno Munadi Tri Muji Susantoro Tri Muji Susantoro, Tri Muji Tunggal Tunggal Tunggal Tunggal, Tunggal Usman Usman Pasarai Usman Usman Wanda Ali Akbar Widjayanto, Bambang A Wong, Patrick M Yensusminar, Desi Yusep K Caryana