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All Journal Indonesian Journal of Electrical Engineering and Computer Science Indonesian Journal of International Law Scientific Contribution Oil and Gas LEMBARAN PUBLIKASI MINYAK DAN GAS BUMI
Bambang Widarsono
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Chemical Engineering, Chemistry & Bioengineering Earth & Planetary Sciences Energy Engineering Environmental Science Law, Crime, Criminology & Criminal Justice Social Sciences

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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): SCOG
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/scog.37.2.221

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.
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): SCOG
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/scog.38.3.245

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.
Integrated Approach to Investigate the Potential of Asphalt/Tar Sand on Buton Island, Indonesia Bambang Widarsono; Djoko Sunarjanto; Tri Muji Susantoro; Suliantara; Herru L Setiawan; Panca Wahyudi; Sugihardjo; Mohamad Romli; Diana Dwiyanarti
Scientific Contributions Oil and Gas Vol. 46 No. 2 (2023): SCOG
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/scog.46.2.324

Abstract

Buton island as a potential area for conventional oil and gas, as well as asphalt/bitumen has long been the target of evaluation aimed at exploiting this potential, although to date no economic exploitation has been implemented. In this study, the potential of Buton asphalt/bitumen with mineable and in situ (non-mineable) status was studied and evaluated. In this study, qualitative and quantitative analysis have been carried out from Landsat 8 and Shuttle Radar Topography Mission (SRTM) data with the aim of identifying the presence of active faults and gravity due to orogenic processes. The lineament density pattern shows a general direction of NE-SW to NNW-SSE. The lineament process between satellite image data and gravity surveys helps efforts to identify the distribution of asphalt on Buton Island. Through combining distribution patterns of the Sampolakosa, Tondo, and Winto Formations, contain asphalt/bitumen, the study produces distribution of asphalt/bitumen accumulation in the region, both in surface/mineable and in situ categories. The 'best estimate' reserves obtained are 786.6 million barrels and 46 million barrels, respectively for asphalt/bitumen surface/mineable reserves and in situ/non-mineable reserves. It is hoped that this information regarding the potential/reserves of asphalt/bitumen on Buton Island may support efforts to exploit it
Downstreaming Buton Asphalt Into Heavy Oil Production: A Techno-Economic Analysis Approach Danang Sismartono; Bambang Widarsono; Arie Rahmadi; Usman; Wanda Ali Akbar; Djoko Sunarjanto; Aziz M Lubad; Herizal; Atyanto D Atmoko; Nurkamelia; Rudi Suhartono; Sunting Kepies
Scientific Contributions Oil and Gas Vol. 46 No. 3 (2023): SCOG
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/scog.46.3.327

Abstract

Oil production from the extraction of Buton Asphalt (Asbuton) becomes an attractive bitumen to study considering that the use of Asbuton is currently still relatively limited for asphalt needs with absorption of only 0.9% of national asphalt needs, of course this is a contradiction considering Asbuton deposits reach 667 million tons. Another factor is the high price of crude oil encouraging the use of bitumen as an alternative to crude oil, especially heavy crude oil. Bitumen reserves contained in Asbuton are capable of meeting oil refinery needs of 50,000 BOPD or the equivalent of 4.3% of domestic refinery capacity for a period of 20 years. There are two options for Bitumen production from Asbuton, namely all production comes from open pit mining or a combination of production from open pit mining (40%) and in situ extraction (60%). The techno-economic analysis was prepared with the assumption that the Asbuton production area is part of the Oil and Gas Working Area with a Cost Recovery Production Sharing Contract (PSC) scheme. The development of Bitumen production from Asbuton provides feasible economic indicators with NPV = $ 973 million and IRR = 15.2%. During the contract period, the government received revenue of $ 12.0 billion and the contractor $ 14.6 billion. This economic feasibility study is expected to enrich further our understanding over Buton asphalt utilization in support of crude oil production in the future
An Integrated Approach for Revisiting Basin-Scale Heavy Oil Potential of The Central Sumatera Basin Bambang Widarsono; Herru Lastiadi Setiawan; Tri Muji Susantoro; Suliantara; Jonathan Setyoko Hadimuljono; Desi Yensusminar; Julikah; Ongki Ari Prayoga
Scientific Contributions Oil and Gas Vol. 44 No. 1 (2021): SCOG
Publisher : Testing Center for Oil and Gas LEMIGAS

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Abstract

Central Sumatra Basin is one of the most prolifi c hydrocarbon basins in Indonesia and has proved itself as being the largest contributor to Indonesia’s national crude oil production. Heavy oil fi elds in the basin, such Duri fi eld as the largest one, plays a very important role in making up the basin’s whole oil production output. In general, the Central Sumatra Basin is also acknowledged for its heavy oil potential. Accordingly, a study under the auspices of the Ministry of Energy and Mineral Resources (MEMR) of the Republic of Indonesia is carried out to re-visit the potential. The study establishes and implements an integrated approach formed by a combined macro and micro analyses. In the macro analysis, a combined evaluations of regional geology, geophysics, geochemistry, remote sensing/geographic information system ( GIS), regional geothermal study, and fi eld survey/ microbiology is performed to identify geological positions of the heavy oil potential. In the micro analysis, on the other hand, qualitative and quantitative well-log analyses supported by well-test and laboratory measurement data on the identifi ed geological positions are carried out with an aim of identifying heavy oil bearing reservoirs/traps under three categories of certainty. The main result of the study is identifi cation of 51 fi elds/structures - producing and non-producing – that bears heavy oil within the three categories. Findings of the study can certainly be used as a prerequisite for more intensive and expansive studies to meet the need for a more solid conclusion regarding the heavy oil potential of the Central Sumatra Basin
Relationship Between Tectonic Evolutions and Presence of Heavy Oil in The Central Sumatra Basin Herru Lastiadi; Suliantara; Bambang Widarsono
Scientific Contributions Oil and Gas Vol. 44 No. 1 (2021): SCOG
Publisher : Testing Center for Oil and Gas LEMIGAS

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Abstract

Heavy oil is formed through biodegradation process of hydrocarbons, as well as water washing, in which light hydrocarbon fraction disappears and leaves the heavy fraction. Heavy oil is essentially an asphaltic, dense (low API gravity), and viscous that is chemically characterized by its high content of asphaltenes in the oil. Although variously defi ned, 25o API is set the upper limit for heavy oil. Heavy oil in the Central Sumatra Basin is evidently formed as a result of biodegradation and water washing (a hydrodynamic process within oil reservoir) mechanisms. These processes occur as result of tectonic uplift of the reservoir after it has been fi lled with hydrocarbons. Heavy oil reservoir depths in the Central Sumatra Basin are generally shallower than 1,000 feet (300-400 meters), at which surface water may may be associated with the reservoir hence enabling the heavy oil transformation. A combined geology, remote sensing/geographic information system ( GIS), geophysics, stratigraphy, and wellbased analyses is utilized to serve the study. It has been observed that within the northern part of the basin, heavy oil is mainly found in fi elds located within uphill fault blocks such as the up-thrown part of the Sebanga thrust fault with its Duri, Sebanga North, Kulin, Rantau Bais, Batang, Akar, and Genting fi elds. In the western part of the basin there are the Kumis, Kotalama and Pendalian heavy oil fi elds associated with Dalu-Dalu thrust fault and Gadang Island uplift. In total 51 fi elds/structures containing or suspected to contain heavy oil are associated with uplifted geological positions, hence showing the strong relations between tectonic evolutions and present day presence of heavy oil within the basin.
Indonesia’s Natural Gas: Production, Reserves, And Challenges Bambang Widarsono
Scientific Contributions Oil and Gas Vol. 30 No. 1 (2007): SCOG
Publisher : Testing Center for Oil and Gas LEMIGAS

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Abstract

Recent years has yvitnessed decline in national oil production at ari alarming rates ofhigher than 10% annually. On the other hand, national gas reserves and production situ-ation is much better even though problems such as unanticipated production shortfall ofexisting fields and commerciality of new reserves have still to be faced. Analysis on historyof production and reserves and comparison betyveen oil and gas discoveries in recent yearsmay lead into a conclusion natural gas may serve as an alternative source for energy andnational incorne in years ahead. Hoyvever, challenges such as technology, infra-struc-tures, law enforcement, social unrests, tight regulations, and incentives are still day-to-dayreality. These challenges need to be addressed appropriately if sustainable gas, and alsooil, productions are to be achieved.
Estimation Of Water Saturationin Carbonate Reseruoirs Without Resistivity Log Data. Parti: Theoryand Existing Model Bambang Widarsono; Heru Atnioko; Ridwan; Kosasih
Scientific Contributions Oil and Gas Vol. 31 No. 2 (2008): SCOG
Publisher : Testing Center for Oil and Gas LEMIGAS

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Abstract

This paper presents an observation over a suggested approaeh for establishing watersaturation model that is specifically designed -\vithout the need of resistivity log data. Oneof the main strength of the approaeh is that the resulting \vater saturation model ean bespecifically established for loeal or specific use only. This is true sinee the approaeh eanbe applied using earbonate roeks that are obtained locally or from specific areas. Anotherimportant eonelusion is that this approaeh ean also be applied for any earbonate roekclassification as long as the classification ean clearly group earbonate roeks into groupsyvith distinctive petrophysical properties. This paper — first part of two — presents theoryand roek classification that underlines the approaeh, as well as proeedure and the existingmodels available.
DEVELOPMENT OF A SUPPLEMENTARY TECHNIQUE FOR DETERMININGIN SITU STRESS MAGNITUDE USING ACOUSTIC WAVE PROPAGATION Bambang Widarsono
Scientific Contributions Oil and Gas Vol. 29 No. 1 (2006): SCOG
Publisher : Testing Center for Oil and Gas LEMIGAS

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Abstract

In accordance with the increasing awareness ofthe importance of in situ stress Information in thedesign of various geotechnical and other petroleum-related subsurface engineering in Indonesia, a com-plete knowledge of the in situ stress is a fundamen-tal requirement.
FUZZY LOGIC AS A TOOL FOR ESTIMATING PRODUCTION POTENTIAL OF A SAND LAYER Bambang Widarsono; Heru Atnwko; Fakhriyadi Saptono; Tunggal; Ridwan
Scientific Contributions Oil and Gas Vol. 27 No. 3 (2004): SCOG
Publisher : Testing Center for Oil and Gas LEMIGAS

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Abstract

In production management, a prior knowledge overproduction potential of acandidate sand layer (geologi-cal complexity in Indonesia has led toexistenceof strati-fied reservoirs with a set of layers) to be opened is al-ways desirable.
Co-Authors Anda Lucia Andi Ruswandi Arie Rahmadi Atmoko, Heru Atyanto D Atmoko Aziz M Lubad 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 Junita Trivianty Junita Trivianty Musu Kosasih KOSASIH KOSASIH, KOSASIH Lucia, Anda Mendrofa, Merkurius F Merkurius. F. Mendrofa Mohamad Romli Musu, Junita Trivianty Nurkamelia Nurkamelia, Nurkamelia Ongki Ari Prayoga Panca Wahyudi Pasarai, Usman Patrick M Wong Prasetyo, Hadi Prayoga, Ongki Ari Pribadi, Endras Rahman, Maizar 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 Sunarjanto, Djoko Sunting Kepies Suprajitno Munadi Suprajitno Munadi Tri Muji Susantoro Tri Muji Susantoro, Tri Muji Tunggal Tunggal, Tunggal Usman Usman Pasarai Usman Usman Wanda Ali Akbar Widjayanto, Bambang A Wong, Patrick M Yensusminar, Desi