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Anisotropy-driven velocity log reconstruction in deviated wells: A case study from deepwater Sadewa Field

Leading Edge 2023年第10期42卷 702-710页

作者： Oktariena, Madaniya Triyoso, Wahyu Sukmono, Sigit Fatkhan, Fatkhan Septama, Erlangga Wardaya, Pongga D. Murdianto, Befriko S. 1 Bandung Institute of Technology Graduate Program of Geophysical Engineering Bandung Indonesia Bandung Institute of Technology Geophysical Engineering Bandung Indonesia Upstream Research & Technology Innovation Jakarta Indonesia Pertamina Hulu Kalimantan Timur Jakarta Indonesia

Deviated drilling is a common cost-cutting strategy used in efforts to develop deepwater hydrocarbon fields. By utilizing the existing platform, new wells are drilled with a particular inclination to reach the intended depth level as a branch of the main vertical well. Drilling at inclination results in a change in the direction of observation from data collection. This change will affect the measured magnitude value when well logging is carried out, especially on physical parameters sensitive to the direction of the measurement such as velocity. Distortion of velocity values due to the orientation effect of data collection has been a limiting factor in seismic analysis because of phase changes during the well-to-seismic tie, inconsistent amplitude variation with offset responses, and ambiguity in the appearance of the hockey stick effect on long-offset seismic data. The oil and gas industry is starting to move toward developing concepts that link the presence of anisotropy recorded in field data with the possibility of hydrocarbon reservoirs. Velocity logging (sonic and shear sonic) should begin to get more attention to support this strategy of making data retrieval results more precise. The motivation of this study is to apply the method of calculating velocity compensation values to reconstruct sonic and shear sonic logs in deviated wells by utilizing anisotropy parameters. By reconstructing the velocity log, the authors attempt to verticalize the log to return the log function to represent subsurface conditions. © 2023 by The Society of Exploration Geophysicists.

关键词： Anisotropy

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Refining the Regional Aftershocks Catalog of the Ambon Earthquake Mw 6.5 on 26 September 2019 using manual picking and a non-linear algorithm: Preliminary Result 9

Refining the Regional Aftershocks Catalog of the Ambon Earth...

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9th Asian Physics Symposium 2021, APS 2021

作者： Kamaruddin, B. Sahara, D.P. Halauwet, Y. Master Program of Geophysical Engineering Faculty of Mining and Petroleum Engineering Bandung Institute of Technology Indonesia Global Geophysics Research Group Faculty of Mining and Petroleum Engineering Bandung Institute of Technology Indonesia Earth Sciences Graduate Program Faculty of Earth Sciences and Technology Bandung Institute of Technology Indonesia Ternate Indonesia Ambon Indonesia

A destructive earthquake with magnitude Mw 6.5 occurred in Ambon, Indonesia, on 26 September 2019. This earthquake generated an aftershock sequence. In this study, we determined the location of the aftershock sequence using a non-linear algorithm from the Non-Linear Location (NonLinLoc) program. The catalog and waveform data were collected using 11 seismographs from BMKG regional network located around the Maluku archipelago. The data was recorded between 26 September and 18 October 2019. We have manually picked the P-and-S wave phase by using Seisgram2K software. In our preliminary result, we have located about 1,300 events of aftershock sequence with about 8,500 phases of P and S waves. Overall, the location of the focus depth of the aftershock sequence is dominantly distributed in between 5 - 25 km. Approximately ∼70% of the distribution of aftershock locations show a North-South (N-S) oriented pattern from west Seram to Ambon Islands. Meanwhile, about ∼20% of the aftershock's locations are distributed around Ambon Island. Our ongoing and future study is to determine accurate hypocentre location derived from double-difference hypocenter relocation with waveform cross-correlation. © Published under licence by IOP Publishing Ltd.

关键词： Location

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Spatio-temporal characterisation of the Beekeeper Formation of Australia: facies development, mixing of carbonate and siliciclastic materials, and influencing factors

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Petroleum Research 2025年

作者： Adhari, Muhammad Ridha Marwan Husin, Husni Ismail, Nazli Ghani, Azman A. Doctoral Program School of Engineering Post Graduate School Universitas Syiah Kuala Banda Aceh23111 Indonesia Department of Geological Engineering Universitas Syiah Kuala Banda Aceh23111 Indonesia Department of Geophysical Engineering Universitas Syiah Kuala Banda Aceh23111 Indonesia Department of Chemical Engineering Universitas Syiah Kuala Banda Aceh23111 Indonesia Department of Physics Universitas Syiah Kuala Banda Aceh23111 Indonesia Department of Geology Universiti Malaya Kuala Lumpur50603 Malaysia

The Beekeeper Formation, a mixed carbonate-siliciclastic reservoir, has long been known as a proven gas reservoir in the northern Perth Basin, Australia. However, its characteristics, and spatio-temporal distribution are still not well understood. There are two main objectives of this study: (1) to identify the main cutting facies groups/subgroups, and electrofacies of the Beekeeper Formation;and (2) to understand spatio-temporal characteristics, and development of the Beekeeper Formation. Integrated multi analyses have been conducted to achieve these objectives including cutting, wireline logging, and XRF analyses. Fifteen types of cutting components, and nine electrofacies were identified forming the Beekeeper Formation. The Beekeeper Formation consists of nine facies sub-groups, and these are classified into carbonate-dominated facies group, siliciclastic-dominated facies group, and mixed carbonate-siliciclastic facies group. Furthermore, this formation can vertically be divided into three parts on the basis of the main facies groups: the lower, middle, and upper parts. The lower and upper parts consist predominantly of siliciclastic materials, while the middle part is dominated by carbonate materials. In the north of the study area, the Beekeeper Formation consists predominantly of siliciclastic materials with minor carbonate materials, whereas in the central to south it consists mainly of carbonate material with minor-moderate siliciclastic materials. Various processes have influenced the evolution of the Beekeeper Formation including influx of siliciclastic components, mixing of carbonate and siliciclastic materials, suitable environment for the growth of carbonate biotas, sea level fluctuation, and tectonic activities. It is expected that findings from this study will provide new insights into characteristics of mixed carbonate-siliciclastic reservoirs in general, and will have regional and global applicability. © 2025 The Authors

关键词： Sea level

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Hypocenter dimension of 7.5 mw Palu earthquake using fractal approach 2

Hypocenter dimension of 7.5 mw Palu earthquake using fractal...

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2nd International Conference of Interdisciplinary Research on Green Environmental Approach for Sustainable Development, ICROEST 2020

作者： Rasimeng, Syamsurijal Alimuddin Rustadi Sinambela, Rudy Z. Mandang, Idris Bakri, Samsul Zaenudin, Ahmad Department of Geophysical Engineering Faculty of Engineering University of Lampung Indonesia Disaster and Mitigation Center Faculty of Engineering University of Lampung Indonesia Study Program of Geophysics Faculty of Mathematics and Natural Science Mulawarman University Indonesia Department of Forestry Graduate Program of Environmental Sciences University of Lampung Indonesia

Research on the Palu earthquake in the period of August to October 2018 has been carried out in the Palu Koro Fault (PKF) zone with a hypocenter of 5-20 km. This study aims to determine the fractal dimensions of these earthquakes based on the relationship between logarithmic frequency and earthquake magnitude correlation introduced by Gutenberg-Richter. Statistical correlation between logarithmic frequency and earthquake magnitude was calculated using the inversion approach. Based on the calculation results obtained fractal dimension value of 1.0378, which describes the seismicity pattern at a depth of 5-20 km. It indicates that the earthquakes triggered by the movement in rupture segments which seen as points along the PKF zone. © Published under licence by IOP Publishing Ltd.

关键词： Earthquakes

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Food security strategies toward flood hazards along the Cinendang river, Aceh Province 2

Food security strategies toward flood hazards along the Cine...

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2nd International Conference on Agriculture and Bioindustry, ICAGRI 2020

作者： Bakhtiar Abdullah, F. Marzuki, M. Yanis, M. Ismail, N. Graduate Program in Disaster Science Universitas Syiah Kuala Banda Aceh23111 Indonesia Department of Physics Universitas Syiah Kuala Banda Aceh23111 Indonesia Politeknik Negeri Lhokseumawe Lhokseumawe24357 Indonesia Department of Geophysical Engineering Universitas Syiah Kuala Banda Aceh23111 Indonesia Research Center of Ethnoscience Universitas Syiah Kuala Banda Aceh23111 Indonesia

Singkil communities have been living along riverbanks for several centuries. They are accustomed to living near the water which has generated local wisdom in mitigating and adapting to flood hazards. This study focuses on food security in overcoming flood hazards practiced as local wisdom by the community living along the Cinendang River, Aceh Singkil. The study applied a descriptive exploration based on field observations, interviews with local communities, and in-depth interviews with community leaders and local government regarding knowledge, experiences, and the implementation of the local wisdom. The result shows that the communities practice local wisdom on structural mitigation and adaptation so that they can still supply and protect their food needs during floods. The community has taken advantage of the floating buildings namely sapao metungkhang, lampung, and bagan for these purposes. These buildings are made of logs found drifting along the river, and they are practically effective in the way that daily household and communal activities can still be carried out in both normal conditions and during the flooding. Such houses are hardly found today due to shortages of raw materials, in-progress inland transportation development, relocation of communities far from rivers, and dimmed water caused by transportation routes. © Published under licence by IOP Publishing Ltd.

关键词： Rivers

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Updating Hypocenter Relocation in Indonesia using 3D Seismic Velocity Model: Period of April 2009-March 2018 2

Updating Hypocenter Relocation in Indonesia using 3D Seismic...

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2nd Southeast Asian Conference on Geophysics, SEACG 2018

作者： Dian Nugraha, Andri Rosalia, Shindy Widiyantoro, Sri Supendi, Pepen Wiyono, Samsul Daryono Global Geophysical Research Group Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Indonesia Graduate Program of Geophysical Engineering Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Indonesia Meteorological Climatological and Geophysical Agency of Indonesia Jakarta Indonesia

In the past 2 years, we have been conducting routine hypocenter relocation in Indonesia. We compiled and conducted hypocenter relocation of ∼50.000 events from a magnitude of 1.4 to 8.5 recorded by 451 stations around and outside Indonesia region. We used local, regional, and teleseismic arrival time data from Indonesian Agency of Meteorology, Climatology, and Geophysics (BMKG) catalog from April 2009 to March 2018. We performed teleseismic double-difference relocation inversion using our previous study of 3D seismic velocity model beneath the Indonesian region with grid size 1° by 1° for inside Indonesia region and 1D global seismic velocity model from AK135 for outside Indonesia region. This method improved limitation from BMKG earthquake data catalog in which events were recorded from scattered seismic station array and insufficient azimuthal gap around Indonesia. Our results show that travel-time RMS residuals were greatly reduced compared to those of the BMKG catalog and the hypocenter location shows significant improvement, refining to the geological structure, especially trench and major faults. These hypocenter relocation results can be helpful for another seismic study in Indonesia region that required a precise hypocenter location e.g. body wave tomography and probability seismic hazard analysis. © 2019 IOP Publishing Ltd. All rights reserved.

关键词： Seismic waves

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Preliminary site characteristics for urban seismic hazard in pasuruan fault from microtremor measurements 4

Preliminary site characteristics for urban seismic hazard in...

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4th Geomatics International Conference 2019, GeoICON 2019

作者： Baskoro, W.T. Warnana, D.D. Widodo, A. Rochman, J.P.G.N. Santosa, B.J. Physics Departement Graduate Program Institut Teknologi Sepuluh Nopember Surabaya60111 Indonesia Geophysical Engineering Departement Institut Teknologi Sepuluh Nopember Surabaya60111 Indonesia

The Pasuruan fault is one of active faults in East-Java with the minimum estimated earthquake magnitude to be 6.6 Mw. Although the Pasuruan fault is relatively small in term of estimated earthquake magnitude, because the area is highly populated, earthquake along the fault could pose a significant hazard to the densely populated region and infrastructure. This study mainly focuses on site characteristics of along the Pasuruan fault based on microtremor Horizontal-to-Vertical spectral ratios (HVSR) as a part of the seismic hazard assessment. Through this measurement, the output the site natural frequency, the amplification and the soil vulnerability maps which will be used to make an urban seismic hazard map for along Pasuruan fault. The microtremor measurements were carried out at 48 locations to investigate the natural frequencies and the amplifications at sites. The results showed that the natural frequency (f0) values range from 1 Hz to 10 Hz and the amplification factor (A0) values range from 2 to 8. Correlations between the natural frequency with the geological formation and topographic were established. Variations of both parameters are also indicated as a result of variations in surface soil parameters. The vulnerability index (Kg) is indicated the soil damage level due to ground motions. The weak zone failed during an earthquake on the Southwest site was identified by the highest Kg value. © 2019 Published under licence by IOP Publishing Ltd.

关键词： Soils

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Hypocenter dimension of 7.5 mw Palu earthquake using fractal approach

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IOP Conference Series: Earth and Environmental Science 2020年第1期575卷

作者： Syamsurijal Rasimeng Alimuddin Rustadi Rudy Z. Sinambela Idris Mandang Samsul Bakri Ahmad Zaenudin Department of Geophysical Engineering Faculty of Engineering University of Lampung Indonesia Disaster and Mitigation Center Faculty of Engineering University of Lampung Indonesia Study Program of Geophysics Faculty of Mathematics and Natural Science Mulawarman University Indonesia Department of Forestry and The Graduate Program of Environmental Sciences University of Lampung Indonesia

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A Geoelectric Approach for Karst Groundwater Analysis

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IOP Conference Series: Earth and Environmental Science 2022年第1期998卷

作者： Amallia Ferhat Taufik Seizarsyah Mohammad Prasanto Bimantio Nanda Satya Nugraha Dian Pratama Putra Teddy Suparyanto Alam Ahmad Hidayat Bens Pardamean Agribusiness Department Institute of Agricultural STIPER Yogyakarta 55282 Indonesia Geophysical Engineering Department Universitas Pembangunan Nasional 'Veteran' Yogyakarta Indonesia Agricultural Crop Technology Department Institute of Agricultural STIPER Yogyakarta 55282 Indonesia Forestry Department Institute of Agricultural STIPER Yogyakarta 55282 Indonesia Agricultural Engineering Department Institute of Agricultural STIPER Yogyakarta 55282 Indonesia Bioinformatics and Data Science Research Center Bina Nusantara University Jakarta Indonesia 11480 Computer Science Department BINUS Graduate Program – Master of Computer Science Bina Nusantara University Jakarta Indonesia 11480

Artesian well is one of the major efforts to obtain water source for fulfilling water demands in Eroniti Conservation park, Ponjong, Yogyakarta by drilling deep into several soil layers. Vertical Electrical Sounding (VES) method is the most common approach to determine the existence of groundwater. The method probes layers of rock below the ground surface based on their electrical properties, since the electrical resistivity of each layer is theoretically different. This study aims to utilize the VES approach for investigating the properties of the rock layers in the area to explore groundwater sources. We install six different VES points in the observation area using Schlumberger electrode configuration. The methodology of the work consists of three steps: the planning of the placement of the sounding points, the measurement step performed by a unit of IRIS SYSCAL Resistivity meter, and the data analysis and interpretation. Employing the resistivity analysis, we conclude that the observed region consists of Mediterranean soil as a result of weathering of limestone as well as lithology of the limestone. Furthermore, there are two types of aquifer found in the area: a perched aquifer found 27 meters below the ground surface of VES point 1 and a confined aquifer 166 meters below the ground surface of VES point 2 and 6.

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Food security strategies toward flood hazards along the Cinendang river, Aceh Province

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IOP Conference Series: Earth and Environmental Science 2021年第1期667卷

作者： Bakhtiar F Abdullah M Marzuki M Yanis N Ismail Graduate Program in Disaster Science Universitas Syiah Kuala Banda Aceh 23111 Indonesia Department of Physics Universitas Syiah Kuala Banda Aceh 23111 Indonesia Politeknik Negeri Lhokseumawe Lhokseumawe 24357 Indonesia Department of Geophysical Engineering Universitas Syiah Kuala Banda Aceh 23111 Indonesia Research Center of Ethnoscience Universitas Syiah Kuala Banda Aceh 23111 Indonesia

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