Article Per Year (5 Year)
p-Index From 2021 - 2026
1.619
P-Index
This Author published in this journals
All Journal Indonesian Journal of Electrical Engineering and Computer Science Indonesian Journal of International Law Scientific Contributions Oil and Gas LEMBARAN PUBLIKASI MINYAK DAN GAS BUMI (LPMGB)
Bambang Widarsono
Unknown Affiliation
Chemical Engineering, Chemistry & Bioengineering Energy Law, Crime, Criminology & Criminal Justice Social Sciences

Published : 31 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 31 Documents
Search

 1   2   3   4 
Fuzzy Logic As A Tool For Estimating Production Potential Of A Sand Layer Bambang Widarsono; Heru Atmoko; Fakhriyadi Saptono; Tunggal Tunggal; Ridwan Ridwan
Scientific Contributions Oil and Gas Vol 27 No 3 (2004)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.27.3.872

Abstract

In production management, a prior knowledge over production potential of a candidate sand layer (geological complexity in Indonesia has led to existence of stratified reservoirs with a set of layers) to be opened is always desirable. The common practice performed during drilling and completion activities of a production well is through the use of well testing and fluid sampling. From the test, fluid dynamic data such as total liquid rate, water cut, and gas cut are produced. A similar set of data is also required for more mature fields for the purpose of monitoring through the running of routine production and/or swab tests.Although the tests, especially flow tests during drilling and completion, are always regarded as the only source of proof about productive layer(s) production potential, an alternative means that can be used to provide estimates is always desired. The main reason is that flow tests are costly so that only layer(s) considered as the most potential are to be assigned for testing. Layer(s) that are considered less potential are left untested, eventhough in some cases they are also set on production during the well's production phase.The idea of establishing a method that can provide illustration over production potentials of all layer(s) always exists. Certainly, there are approaches to serve the purpose such as productivity index (PI) analogy and petrophysical through fractional flow measurement in a core laboratory. However, those approaches are often considered inadequate in accommodating various factors that may influence production potential.To materialize the idea stated above, the pattern recognition approach was taken. This approach was taken in order to model the relationships between various fac- tors in wellbore and production potential without being trapped by the certain complexity that occurs in any mathematical expressions trying to explain the relationships. For the purpose, fuzzy logie (a branch in ArtificialIntelligence) has been used. The choice is actually based on its ability to accommodate both numeric and non-numeric data. Some non-numeric data such as lithology and pore system also have some degrees of influence on production potential. With a tool that enables us to have production potential estimates of reservoir layers, from which layers with the most promising potential are taken to undergo flow tests. Furthermore, as flow test data has been acquired and used as feedback and calibration by the fuzzy model, production potential of layer(s) with less promising or ambiguous prospect can also be predicted.
An Intelligent Approach For Obtaining True Resistivity (𝑅𝑇) From Rock Acoustic Data : A Laboratory Verification Bambang Widarsono; Fakhriyadi Saptono; Heru Atmoko
Scientific Contributions Oil and Gas Vol 26 No 1 (2003)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.26.1.875

Abstract

Rock true resistivity (Rt) is known as more sensitive than compressional-wave velocity (Vp), the principal output of a seismic survey, to variation in water saturation. Therefore, it would be of a great value if there were a way to predict resistivity distribution from seismic signals. This study is essentially an effort to see the possibility of predicting Rt from Vp through a pattern recognition approach. For the purpose, a series of laboratory tests were performed on some Central Sumatran clay-free sandstone samples of various porosity values and at various water saturation levels. For studying the pattern of relationship, artificial neural networks (ANNs) were applied. From the ‘training’ (i.e.pattern recognition) activity performed using the ANNs, it has been show between Vp and Rt in the following ‘blind test’, it has also been shown that the trained relationship can be used to estimate Rt reliably using other data as input. Comparisons between estimated and observed Rt data have indicated good agreement implying the success of the approach taken in the study. This has laid the foundation and justification for further application of the approach on seismic and well-log data.
Application of Artificial Neural Network for Assisting Seismic-Based Reservoir Characterization Bambang Widarsono; Fakhriyadi Saptono; Patrick M Wong; Suprajitno Munadi
Scientific Contributions Oil and Gas Vol 25 No 1 (2002)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.25.1.879

Abstract

 Reservoir rock physical properties, such as porosity and water saturation, always play prominent roles in the development of oil and gas fields. Accurate information regarding their distribution is always desired. For this new approach that uses a purpose, a combination of intelligent computing (artificial neural network or ANN) and rock physics, with a full utilization of core data, well logs and seismic-derived attributes, is proposed. The method is basically an effort to link the required rock physical properties to seismic- derived attributes through the use of rock physics theories. The ANN itself is used to fill the gaps of data array required by the proposed method through its capacity for pattern recognition. The proposed method is applied to a limestone reservoir in East Java. Validation is carried out by comparing the results to the observed data at well locations as well as by geological justification. The application has shown a new potential for supporting reservoir modeling and field development.
Reducing Uncertainty In Log Analysis Due To Presence Of Heavy-Conductive Minerals In Sendimentary Rocks Bambang Widarsono
Scientific Contributions Oil and Gas Vol 23 No 1 (2000)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.23.1.880

Abstract

Presence of heavy-conductive mineral(s) in formation rocks tends to provide negative influence to some log readings especially the resistivity log. With regard to its function in log analysis, any distortion in resistivity log readings will certainly lead to potential misinterpretation on petrophysical properties such as water saturation (S.) Therefore a method dedicated to minimizing the effect is indeed necessary.This paper presents results of a study on presence of heavy-conductive minerals, distributed in structural form, on resistivity reading. Based on analogy and expansion of a structural clay distribution model, a correction method plus its application procedure have been proposed. Since the method is develop using an approach that is considered valid in general term it is, therefore, conceptually applicable to any field cases as long as its theoretical conditions are met. In order to make application of the method easier it has also been presented in form of nomographs.Application of the method on log analysis of two wells in West Java has proved itself well in which corrections on calculated water saturation have yielded values that are more consistent when compared to production test data. The method is also prepared in a manner that it can be easily integrated into standard log analysis practices.
In-Situ Stresses In Rock Masses: A General Review Bambang Widarsono
Scientific Contributions Oil and Gas Vol 23 No 2 (2000)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.23.2.881

Abstract

The in situ state of stress is a rock's point-to-point property that must be taken into consideration in every subsurface engineering activity This has been realized to an increasing extent over the past 10 - 20 years. Good quality in situ stress information enhances the quality of engineering designs such ax for mining, petroleum and geothermal production. In turn good engineering designs will support the process of decision making in related industries. However, efforts are required to encourage the use and integration of this information into the engineering activities.This paper is basically a general review over the in situ stress that encompasses various aspects, among others are concept, causes/sources that generate it, influencing factors, the effect of scales, techniques for measuring it, and its distribution throughout the lithosphere. The review is supported by works and conclusions that have been made by various investigators in the past. The relative absence of the use of in situ stress information in petroleum engineering practices in Indonesia is also discussed. This includes the absence of demand upon the information, probable consequence, and the field cases that are likely caused by the absence.Apart from the importance of in situ stress information shown by the review, it has also prompted the need to apply proper use of in situ stress information in relation to the corresponding engineering scales. Inappropriate measurement techniques assigned to an engineering problem, which corresponds to a certain scale, will certainly lead to a serious misprediction over the expected outcome. These all are hoped to provide operators in the industry a complete general view over the in situ stresses their importance.
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.
INDONESIA’S NATURAL GAS: PRODUCTION, RESERVES, AND CHALLENGES Bambang Widarsono
Scientific Contributions Oil and Gas Vol 30 No 1 (2007)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.30.1.972

Abstract

Recent years has witnessed decline in national oil production at an alarming rates of  higher than 10% annually. On the other hand, national gas reserves and production situation  is much better even though problems such as unanticipated production shortfall of  existing fields and commerciality of new reserves have still to be faced. Analysis on history  of production and reserves and comparison between oil and gas discoveries in recent years  may lead into a conclusion natural gas may serve as an alternative source for energy and  national income in years ahead. However, challenges such as technology, infra-structures,  law enforcement, social unrests, tight regulations, and incentives are still day-to-day  reality. These challenges need to be addressed appropriately if sustainable gas, and also  oil, productions are to be achieved.  
NMR T2 CUT OFF: WHICH ONE IS TO BE USED FOR APPLICATION? Bambang Widarsono; Junita Trivianty Musu
Scientific Contributions Oil and Gas Vol 30 No 3 (2007)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.30.3.977

Abstract

Recent developments in petroleum industry have been witnessing the surge of the use of nuclear magnetic resonance (NMR) log. Despite some remaining problems the NMR technology appears to gain more acceptance as petrophysical tool for evaluating reservoir quality. Comprehensive formation evaluation requires determination of irreducible fluids, movable fluids, and permeability. However, rock heterogeneity introduces complexity in any formation evaluation activities. This can also cause problem for NMR log interpretation. In the presence of clays the most commonly used T2 cut off values, a constant value throughout a formation, seem to eventually yield inaccurate irreducible water saturation estimates, as well as other output such as permeability. This study focuses at finding a solution for finding the best way of choosing the most representative T2 cut off value to be used in NMR log interpretation. This is indeed a common pressing problem for heterogeneous formation rocks such as in the case of Tirrawarra sandstones used in this study. The main part of the study is devoted to comparison between the use of single averaged T2c value and establishment of empirical correlations enabling the provision of T2c for any level of heterogeneity (i.e. various levels of shaliness). The study however surprisingly shows that, in spite of the theoretical soundness of the empirical correlations established, simple averaging of T2c values yielded by a reliable method proves itself adequate. This conclusion therefore helps considerably in reducing complexity in NMR log interpretation.
Rock Compressibility Characteristics of Oil and Gas Sandstone Reservoirs in the Western Part of Indonesia Widarsono, Bambang; Musu, Junita T.; Yohanes, Yohanes D. Wangge
Scientific Contributions Oil and Gas Vol 48 No 4 (2025)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/scog.v48i4.1936

Abstract

Rock compressibility is one of rocks’ properties that is closely related to their response to changes in effective stresses. Various Earth’s subsurface-related processes involve rock compressibility. In petroleum production, for instance, it provides reservoir energy needed for the process. Studies on rock compressibility for Indonesian reservoirs are very limited. Therefore, a study has been carried out to investigate rock compressibility characteristics of Indonesian reservoir rocks, sandstones in particular. A total of 205 sandstone samples of various types have been collected from 34 oil/gas fields in nine productive sedimentary basins in Indonesia. The samples are prepared and laboratory tested for their basic properties and pore volume compressibility following the universally adopted standard methods. Results of this study indicate unclear trends in the rock property of concern in relation to porosity. However, with careful grouping and cluster analyses, clearer trends representing their intrinsic characteristics can be spotted, and appropriate correlations based on a generalized model can be established. The established correlations of maximum effective rock compressibility versus porosity offer opportunities to understand the characteristics of reservoir sandstone compressibility. Special cautions have been discussed, and special suggestions have also been offered for selecting the most appropriate correlations.
KAJIAN REGULASI PENGUSAHAAN OIL SANDS KEDALAMAN DANGKAL DENGAN METODE OIL MINING Usman Pasarai; Hazman Hazman; Endras Pribadi; Anda Lucia; Bambang Widarsono
Lembaran publikasi minyak dan gas bumi Vol 53 No 1 (2019)
Publisher : BBPMGB LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/LPMGB.53.1.265

Abstract

Untuk mengurangi kesenjangan antara kemampuan produksi dan kebutuhan minyak bumi nasional yang semakin lebar ke depan, maka diperlukan kegiatan penganekaragaman sumber daya minyak bumi, diantaranya dari oil sands kedalaman dangkal. Teknologi eksploitasi oil sands kedalaman dangkal dengan cara penambangan terbuka yang dikenal sebagai oil mining sangat berbeda dengan teknologi eksploitasi minyak bumi konvensional, sehingga diperlukan regulasi khusus sebagai landasan hukum operasional oil mining. Tujuan kajian ini adalah menelaah aturan hukum, prinsip-prinsip hukum, maupun doktrin-doktrin hukum guna menjawab isu rezim dan aturan hukum yang diperlukan terkait pengusahaan oil sands kedalaman dangkal. Metodologi kajian menggunakan pendekatan hukum normatif. Pengumpulan data dilakukan dengan studi pustaka terhadap data sekunder serta bahan hukum primer dan sekunder. Hasil kajian menyimpulkan bahwa karakteristik minyak bumi yang ditemukan pada endapan dangkal oil sands di Indonesia memenuhi kriteria pengertian minyak bumi yang dimaksud Pasal 1 Ayat 1 Undang-Undang Nomor 22 Tahun 2001 tentang Minyak dan Gas Bumi, sehingga undang-undang ini dapat menjadi payung hukum pengusahaan oil sands dengan teknologi oil mining. Dukungan formal dari Pemerintah kepada Kontraktor Hulu Migas pada tahap uji coba diperlukan karena belum ada regulasi khusus sebagai landasan hukum operasional kegiatan oil mining. Teknologi oil mining perlu diakomodir dalam definisi Eksploitasi dalam Undang Undang Migas untuk menjadi landasan hukum positif pengembangan oil sands kedalaman dangkal untuk peningkatan cadangan dan produksi minyak bumi nasional.
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 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 T. 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 Pasarai Usman Usman Wanda Ali Akbar Widjayanto, Bambang A Wong, Patrick M Yensusminar, Desi Yohanes, Yohanes D. Wangge Yusep K Caryana