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Integrated Pore Pressure Model Estimation – Case study of Jambi Sub-basin, South Sumatera, Indonesia

IOP Conference Series: Earth and Environmental Science 2021年第1期873卷

作者： Ahmad Farhan Farabi Ignatius Sonny Winardhie Noor Cahyo Wibowo Geophysical Engineering Study Program Faculty of Mining and Petroleum Engineering Bandung Institute of Technology Bandung Indonesia Geophysics Division Pertamina Upstream Technical Center Jakarta Indonesia.

Pore pressure estimation is crucial in drilling wells for safety purposes also a very effective method for dealing with drilling accidents. Determination of overpressure is the main foundation in the evaluation to minimize the non-productive time (NPT). Here we present several models to generate pore pressure analysis of well from Jambi Sub-basin, South Sumatera, Indonesia. The model for estimation pore pressure is carried out by 3 methods: Eaton, Yan & Han, and Kan & Swan. Those methods will be compared to gain a more accurate model estimation within the study area. Kan and Swan's model show the best fit for estimation because this method is suitable for the formation of tester like MDT/DST on higher frequency with parameter of C1 = 0.001 and C2 = 0.0003 for Jambi Sub-basin. The velocity data to construct the 3D pore pressure model was also validated with well data using multi-attribute analysis. The multi-attribute analysis used 2 algorithms, namely step-wise regression and probabilistic neural network (PNN). The analysis show that PNN has a better correlation compared to step-wise regression. The analysis shows the overpressure zone depth is ranges from 1700 – 2000m on Gumai Formation with maximum pressure around 6500 psi. The peak of overpressure dominated by Gumai and Talang Akar formation is caused by the loading mechanism because the rate of sedimentation on thick shale sequence is higher than the rate of dewatering on those formations.

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Preliminary result of P-wave speed tomography beneath North Sumatera region

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AIP Conference Proceedings 2015年第1期1658卷

作者： Jajat Jatnika Andri Dian Nugraha Wandono Earth Science Study Program Institute of Technology Bandung Indonesia Indonesian Meteorological Climatological and Geophysical Agency MCGA Jakarta Indonesia Global Geophysical Research Group Faculty of Mining and Petroleum Engineering Insitute of Technology Bandung Indonesia

The structure of P-wave speed beneath the North Sumatra region was determined using P-wave arrival times compiled by MCGA from time periods of January 2009 to December 2012 combining with PASSCAL data for February to May 1995. In total, there are 2,246 local earthquake events with 10,666 P-wave phases from 63 stations seismic around the study area. Ray tracing to estimate travel time from source to receiver in this study by applying pseudo-bending method while the damped LSQR method was used for the tomographic inversion. Based on assessment of ray coverage, earthquakes and stations distribution, horizontal grid nodes was set up of 30×30 km2 for inside the study area and 80×80 km2 for outside the study area. The tomographic inversion results show low Vp anomaly beneath Toba caldera complex region and around the Sumatra Fault Zones (SFZ). These features are consistent with previous study. The low Vp anomaly beneath Toba caldera complex are observed around Mt. Pusuk Bukit at depths of 5 km down to 100 km. The interpretation is these anomalies may be associated with ascending hot materials from subduction processes at depths of 80 km down to 100 km. The obtained Vp structure from local tomography will give valuable information to enhance understanding of tectonic and volcanic in this study area.

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Hypocenter relocation using a fast grid search method and a 3-D seismic velocity model for the Sumatra region

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AIP Conference Proceedings 2013年第1期1554卷 293-296页

作者： Hendro Nugroho Sri Widiyantoro Andri Dian Nugraha Study Program of Earth Sciences Faculty of Earth Sciences and Technology Institute of Technology Bandung Jl. Ganesha No. 10 Bandung 40132 Indonesia and Meteorological Climatological and Geophysical Agency Jl. Angkasa 1 No. 2 Kemayoran Jakar Indonesia Global Geophysics Research Group Faculty of Mining and Petroleum Engineering Institute of Technology Bandung Jl. Ganesha No. 10 Bandung 40132 Indonesia Global Geophysics Research Group Faculty of Mining and Petroleum Engineering Institute of Technologyc Bandung Jl. Ganesha No. 10 Bandung 40132 Indonesia

Determination of earthquake hypocenter in Indonesia conducted by the Meteorological, Climatological, and geophysical Agency (MCGA) has still used a 1-D seismic velocity model. In this research, we have applied a Fast Grid Search (FGM) method and a 3-D velocity model resulting from tomographic imaging to relocate earthquakes in the Sumatran region. The data were taken from the MCGA data catalog from 2009 to 2011 comprising of subduction zone and on land fault earthquakes with magnitude greater than 4 Mw. Our preliminary results show some significant changes in the depths of the relocated earthquakes which are in general deeper than the depths of hypocenters from the MCGA data catalog. The residual times resulting from the relocation process are smaller than those prior to the relocation. Encouraged by these results, we will continue to conduct hypocenter relocation for all events from the MCGA data catalog periodically in order to produce a new data catalog with good quality. We hope that the new data catalog will be useful for further studies.

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Analysis of Focal Mechanism for Determine Fault Plane Orientation Using The Moment Tensor Inversion Case study : West Java Geothermal Field

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IOP Conference Series: Earth and Environmental Science 2019年第1期318卷

作者： Rhamadhana Sultan Mohammad Rachmat Sule Andri Hendriyana Pepen Supendi Geothermal Engineering Study Program Institut Teknologi Bandung Indonesia Jl. Ganesha No.10 Bandung West Java Indonesia. 40132 Geophysical Engineering Study Program Institut Teknologi Bandung Indonesia Jl. Ganesha No.10 Bandung West Java Indonesia. 40132

Micro earthquakes in geothermal field is used to monitor subsurface conditions especially in the reservoir. Micro earthquakes data can be used to determine focal mechanism or fault plane solution with moment tensor inversion method using ISOLA program in MATLAB-GUI. Focal mechanism or fault plane solution describes the orientation of the fault and slip on the fault relative to a geographical coordinate system. The arrival time of the P wave from the 3-component seismometer recording is used in moment tensor inversion and the frequency band that used is 0.02 to 0.08 Hz. The result of inversion with minor error indicated by the value of variance reduction approaching 1 calculated is from modelling waveform synthetic with green function and waveform observation. Fault plane solution in the field that represented by beach ball describes the dominant fault in the North is oblique fault with dip 30–90 degree and in the South is reverse fault with dip 20-85 degree.

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Preliminary Gravity study of Pre-Tertiary and Tertiary Rock in Northern Kebumen, Central Java, Indonesia

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IOP Conference Series: Earth and Environmental Science 2019年第1期318卷

作者： Faridz Nizar Ahmady Djoko Santoso Geophysical Engineering Study Program Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Bandung 40132 Indonesia Applied Geophysics Research Group Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Bandung 40132 Indonesia

Luk Ulo Melange Complex is a Pre-Tertiary rock formation consisting of various lithological background and complicated geological structure. Located in Northern Kebumen Regency, this rock is originally interpreted as products of tectonic process caused by paleo-subduction between Indian Oceanic Plate beneath Eurasian Plate in Cretaceous age. According to previous study on geological surface investigation shows that the melange complex is tectonically overlain by Tertiary sedimentary formation. On the contrary, geophysical study of the subsurface condition of the area is still under discussion due to limited of measured data. In order to obtain detailed subsurface image, gravity profiling was measured and interpreted across both Tertiary and pre-Tertiary rock. Frequency domain filter and designed moving average filter were used to separate residual and regional anomaly. The results denote gravity value of residual anomaly varying from -5 to +5 mGal, while regional anomaly is ranging from 150-180 mGal respectively. The preliminary interpretation was developed by taking into account the geological information and also the data that was collected during field campaign. Overall, high gravity anomaly is interpreted as diabase intrusion in the middle of research area. Meanwhile, low gravity anomaly indicated clay rich rock material related to matrix content of Luk-Ulo Melange Complex in the northern area.

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A Non-Linear Method for Hypocenter Determination around Central and East Java Region: Preliminary Result

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IOP Conference Series: Earth and Environmental Science 2019年第1期318卷

作者： Faiz Muttaqy Andri Dian Nugraha Nanang T Puspito Pepen Supendi Shindy Rosalia Geophysical Engineering Study Program Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Global Geophysics Research Group Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Agency for Meteorology Climatology and Geophysics (BMKG) Bandung Indonesia

Java Island is highly active tectonic zone and also has a complex geological system as a result of Indo-Australian plate that subducted under the Eurasian plate. This complexity produces many large and destructive earthquakes. Moreover, Java is a most densely populated region in Indonesia. The precise earthquake location can define and evaluate the seismic hazard in the area. In this study, we determined hypocenter location around the central and east Java region by using a non-linear method. We manually picked P-and S-wave arrival time recorded by BMKG network for the time period of 2009 to 2017. We used the minimum 1D seismic velocity model of ak135 to locate the events. We used some criteria for the determination of event location including (i) at least recorded by 4 station which has clear onset P and S arrival, and (ii) has magnitude (MW) > 3. The seismicity in the study area is controlled by subduction and many active faults distributed along the Java Island, also clustered in several areas such as Kendeng thrust, Opak river fault, Kebumen, Banyuwangi, and others. The result of this study indicates the accurately main shallow seismicity zones in central and eastern part of Java region, and also confirm the presence of active inland faults. As further studies, we will conduct 1D velocity modeling and relocate the hypocenters using an updated local 1D velocity model beneath the study area.

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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

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.

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Shear wave velocity analysis for site classification of Tadulako University using microtremor measurements

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AIP Conference Proceedings 2023年第1期2719卷

作者： Icha Untari Meidji Nurhayati Pimpilemba Hendrik Leopatty Mauludin Kurniawan Mustafa Ahmad Harsano Jayadi Physics Department Universitas Negeri Gorontalo Gorontalo Indonesia Agency for Meteorology Climatology and Geophysics (BMKG) Class 1 Palu Indonesia Geophysical Engineering Department University of Tadulako Palu Indonesia Geological Engineering Study Program University of Tadulako Palu Indonesia Doctoral Program of Physics Department ITS Surabaya Indonesia

Shear wave velocity (Vs30) is one of the local condition parameters often used to determine buildings’ vulnerability to potential damage if an earthquake occurs. This parameter is essential for planning and evaluation in infrastructure development. Tadulako University, which is repairing the building and the layout of the campus area after the September 28, 2018 earthquake, needs to consider the parameters of the shear wave. Measurements of the Vs30 value have been carried out at 20 points spread across Tadulako University using the microtremor method. The value of Vs30 is then estimated to determine the classification of the surface soil. The results obtained indicate that the variation in value is not too significant; it is between 424 m/s – 530 m/s. This value is included in the C class site and has very dense soil and soft rock soil profile classification. The highest value is in the southwest part, and the lowest value is in the northeast part.

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Seasonal variations in sediment characteristics at the estuary of Bengawan Solo river: A study of river branching and flow velocity influences

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AIP Conference Proceedings 2024年第1期3110卷

作者： Andi Patriadi Ria Asih Aryani Soemitro Dwa Desa Warnana Study Program of Civil Engineering Faculty of Engineering Universitas 17 Agustus 1945 Surabaya Surabaya Indonesia Department of Civil Engineering Faculty of Civil Planning and Geo Engineering Institut Teknologi Sepuluh Nopember Surabaya Indonesia Department of Geophysical Engineering Faculty of Civil Planning and Geo Engineering Institut Teknologi Sepuluh Nopember Surabaya Indonesia

This research investigates the dynamic of sediment deposition in estuaries, focusing on the role of river branching and flow velocity, aspects that have not been comprehensively studied before. The study assesses the variation in sediment deposition characteristics before and after a river branch over a year. Monthly bed sediment samples were taken for a period of one year, which included both the monsoon and dry season and were tested using sieve analysis for sediment classification. Flow velocity, previously modelled using HEC-RAS, was considered when evaluating sediment deposition patterns. Preliminary findings reveal a marked seasonal variation in sediment characteristics. During the monsoon season, sediments upstream of the river branch predominantly comprised medium-to fine-grained material. Conversely, downstream of the river branch, a similar sediment texture was observed primarily during the dry season. It is concluded that while the river branch plays a substantial role in dictating sediment deposition characteristics, the impact of flow velocity must also be acknowledged. This research, therefore, adds a new dimension to the understanding of sediment deposition patterns and characteristics in estuaries, particularly the interactive influence of seasonal variations, river branching and flow velocity. This can have important implications for estuarine ecosystem management and sediment-related hazard prediction.

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Adaptive irregular grid of seismic tomography: A synthetic test

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AIP Conference Proceedings 2024年第1期3019卷

作者： I. Putu Raditya Ambara Putra David P. Sahara Wahyu Hidayat Sri Widiyantoro Suharsono Geophysical Engineering Study Program Faculty of Technology Mineral UPN Veteran Yogyakarta Special Region of Yogyakarta Indonesia Global Geophysics Research Group Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Bandung West Java Indonesia Faculty of Engineering Maranatha Christian University Bandung West Java Indonesia

Seismic tomography is a method that is widely applied to obtain seismic velocity structures below the surface. This method is applied to various cases, from global to regional scales, as well as local scales such as in the case of volcanoes, geothermal areas and underground mining. Until now, the grid form that is still widely used is the regular grid form. With a very rigid grid shape, it will be more difficult and inflexible to model the geometry of certain geological models that are very varied, even though mathematically there is no reason to avoid certain grid shapes and sizes. In order to minimize the uncertainty of the subsurface geological model grid, we developed a script to perform seismic tomography where the shape and size of the grid can be made irregular based on the Voronoi diagram. The number of grids in the inversion process can also adaptively increase or decrease based on the number of the raypath data. We then applied it to the synthetic crosshole tomography data and compared the results with the regular grid. With the irregular shape and size of the grid, better inversion results are obtained and are more suitable with the synthetic model.

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