Papers by Teuku Abdullah Sanny
The Effects of Porosity on The Anisotropy Parameters of The Slope Fan Facies Sand Reservoirs in The Deepwater Kutai Basin, East Kalimantan, Indonesia
Ultrasonic Tomography of Core Plug Using Fresnel Volume Approach
Determination of Velocity Model by using Nip-Wave tomographic Inversion: Application to synthetic and real Data
Proc. Indon Petrol. Assoc., 33rd Ann. Conv.
Use of electrical geophysical methods for supporting agricultural practices
Nucleation and Atmospheric Aerosols, 2017
Geophysical methods have been increasingly popular for shallow and environmental studies worldwid... more Geophysical methods have been increasingly popular for shallow and environmental studies worldwide. In particular an electrical geophysical method is helpful in soil investigation which focuses on an interval from the ground surface down to a depth of 2 meters. The instrument of electrical geophysics were developed and successfully applied to assist in precision agricultural practices worldwide, i.e. Europe, Russia, and US. Our group from Indonesia has modified a resistivity instrument that integrates with other components and could increase mobility in soil mapping. The instrument measures electrical resistivity, conductivity, and potential that can be used for agricultural applications. In addition, we created forward modelsto help us understand and detect limits of our target.
Improvement of Seismic Tomographic Imaging by Downward Continuation and Modified SIRT
There were some problems with seismic tomographic reconstruction when the Low Velocity Layer (LVL... more There were some problems with seismic tomographic reconstruction when the Low Velocity Layer (LVL) exists at the top of the investigation area. Consequently, a new technique has been introduced to improved the tomographic image. It is based on the downward continuation principle. The presence of the LVL is known as determined by the refraction seismic method. The knowledge of the thickness of the LVL and the top of bedrock enables us to place 'virtual receiver' and/or 'virtual source' in appropriate places by the raytracing methodology. The use of the downward continuation principle by locating the 'source' and/or 'receiver' below the LVL can maximize reconstruction and reduce the effects of the LVL on tomography image reconstruction. To learn more about the capability of this methodology, four tomographic algorithms were tested through synthetic studies, i.e. Back Projection Technique (BPT), Iterative Least Square Technique (ILST), Simultaneous Itera...
2-D time-domain waveform inversion using Gauss-Newton methodology in elastic media, case study: complex marmousi2 model
Proceedings, Apr 9, 2018
Summary Full-Waveform Inversion (FWI) can be defined as an iterative fitting data procedure for o... more Summary Full-Waveform Inversion (FWI) can be defined as an iterative fitting data procedure for obtaining physical properties of the Earth based on the full wave-field data simulation. Hence, FWI is widely known as a comprehensive way to solve the complex structure below the earth surface, it performed a high-resolution image, and very powerful when it combined with the good prior model. In this research, we especially focusing on how we worked with the 2-D Full-Waveform Inversion (FWI) using Gauss-Newton approach in elastic media. The steps included the forward modeling problem based on the finite-difference and staggered grid scheme that bounded by free-surface boundary condition (on the top of model) and Perfectly Matched Layer (PML) for the rest, also, we applied the Gauss-Newton inversion that exploit the approximate-Hessian into this methodology. For the result, we tested the inversion modeling in simple layer cake model and complex marmousi2 model, both of those models are located in the shallow area.
Seismic Wave Modeling of Numerical Dispersion using Cross-rhombus Stencil
Proceedings, Apr 9, 2018
Innovation for soil studies with electromagnetic induction techniques
Nucleation and Atmospheric Aerosols, 2017
Electromagnetic methods for soil research have been applied in the worldwide over the decades. In... more Electromagnetic methods for soil research have been applied in the worldwide over the decades. In particular Electromagnetic induction (EMI) techniques have been developed to provide more accurately soil maps. Present EMI methods can identify, characterize, and map spatially-varying soil types and properties offers better than traditional methods. In the future, the EMI techniques will be integrated with agricultural machinery and will be more effective to mapping of both lateral and vertical variations in soil properties. With that advantages, the systems should be utilized in precision agriculture more often in Indonesia. In addition, forward modelling also included in this research as a survey design tool before the outset of field campaign.
Identification of Lembang fault, West-Java Indonesia by using controlled source audio-magnetotelluric (CSAMT)
Nucleation and Atmospheric Aerosols, 2017
The objective of this study is to determine boundary and how to know surrounding area between Lem... more The objective of this study is to determine boundary and how to know surrounding area between Lembang Fault and Cimandiri fault. For the detailed study we used three methodologies: (1). Surface deformation modeling by using Boundary Element method and (2) Controlled Source Audiomagneto Telluric (CSAMT). Based on the study by using surface deformation by using Boundary Element Methods (BEM), the direction Lembang fault has a dominant displacement in east direction. The eastward displacement at the nothern fault block is smaller than the eastward displacement at the southern fault block which indicates that each fault block move in left direction relative to each other. From this study we know that Lembang fault in this area has left lateral strike slip component. The western part of the Lembang fault move in west direction different from the eastern part that moves in east direction. Stress distribution map of Lembang fault shows difference between the eastern and western segments of Lembang fault. Displac...
International journal of engineering and technology, Aug 31, 2016
The purpose of this paper is to present an evaluation of the development of new innovation techno... more The purpose of this paper is to present an evaluation of the development of new innovation technology and organization innovation in Bandung. Bandung is famous for its good atmosphere for creative industries' activities in Indonesia and has more than 150 companies which have turned into creative industries. In the Global City Competitiveness Index, Bandung ranks 150 th and the rank is estimated to increase up to 5 grades higher in 2025 above Karachi, Hanoi, and Nairobi. Indonesian government has embarked on numerous approaches to promote various innovations, including innovation in technology because innovation is a powerful idea to implement the application of innovation in order to create new various products of technologies, new processes, and new services. The biggest problem faced by Bandung's creative industries is the culture of innovation in the organization especially in the small and medium-sized enterprises. This paper will discuss the impact of innovation technology on creative industries and how to manage an organization in order to attain the growth required. Keyword-Innovation, intellectual capital, organizational innovation, creative industries, competitiveness index I. INTRODUCTION In recent years, several developed countries have started using a new concept which is based on 'innovation' and 'creativity' in improving the quality of life of individual, business products, technology, management, and marketing to their organization. This can be seen from so many countries which use slogans as their 'icon', such as: 'No single day without innovation.', 'Innovation is the foundation of our business.', 'our company is Innovative organization', 'Innovative technology is our product', Inovation is new way to new wealth' (Hesselbein & Johnston, R., 2002) and so on. Most of the products on the theme of creativity and innovation highlight the most successful technology they develop, particularly in the field of Information Technology and Communication (ICT) which is more and more sophisticated and widespreading altogether with its rapid growth. It is conceivable that ICT's progress is seen growing every three months and keeps growing in turns viewed in various aspects of capabilities, speed, memory capacity, even the model, color and type. Some countries like USA, Japan, China and Korea have their both economic and business growth significantly improved due to an ability to develop their innovation and creativity especially in technology, thus, creating the competition in industrial works which is highly competitive such as Microsoft, Google, Yahoo, Samsung and so on. The under developing breakthrough provides the widest possible opportunities on the mastery of technology and innovation in order to win the competition against competitors and their suppliers to get an effective way to regulate the product and the process of transition in which the main task is to reach the point of peak science by making intimate relationship between innovation technology process and organization innovation. A very important change in products of technology, services, operations, administrative procedures generates new strategies, new organizational structures and new operating procedures which are necessary to achieve the peak achievement. In general, according to Ettlie (2009); An enterprise will get double benefit if their team is able to build a harmonious integration between advancing technological innovation and organizational innovation (see figure 1).
Weak Zone Determination Inside The Tunnel Using H/V Ratio Method
Journal of physics, Mar 1, 2020
Tunnel is a vital structure in transportation as it shortens the distance between places through ... more Tunnel is a vital structure in transportation as it shortens the distance between places through underground. Nevertheless, since it goes via underground, there are several risks might occur, such as tunnel collapse. This occasion will result in plenty of casualties. Therefore, as the preventive attempt, there should be a particular method to determine that the tunnel is strong enough. One of the methods that may work for this case is microtremor and one of the most common method in microtremor is H/V ratio. H/V ratio is able to describe a natural frequency of a place or a structure. By using the natural frequency, the stability of the tunnel can be determined. To test out the method, a measurement is conducted in a tunnel at Institut Teknologi Bandung. This tunnel connects the main campus and the campus sports ground. It also lies under the main road which has a lot of traffics at all time. The measurement is done on the wall side of the tunnel, while the space between measurement station is 6 meters and the station cover the whole tunnel wall side. After measuring the tremor in every station, the tremor data will be processed with Geopsy software and the natural frequency of the tunnel will be acquired. Subsequently, the natural frequency of the entire tunnel will be plotted and the result from this plotting can be used to determine the weak zone of the tunnel.
Velocity Dispersion Attribute in Carbonate Reservoir
Journal of physics, Jun 1, 2022
Detection of the presence of saturated hydrocarbons in pores or rock fractures is a major problem... more Detection of the presence of saturated hydrocarbons in pores or rock fractures is a major problem in the field of exploration geophysics which is interesting to study. Some of the fluid saturation indicators were originally derived from the Zoepprit equation. However, the indicator that is derived from the linearization of the reflection coefficient is not influenced by frequency. In fact, frequency is a physical quantity that is very sensitive to the presence of fluid in a pore or rock fracture. Seismic waves will experience attenuation and dispersion when propagating through a porous medium or gas-saturated fractures. Therefore, we need an indicator whose value is influenced by changes in the frequency of seismic waves. This indicator is an attribute of the velocity dispersion. In previous studies, the velocity dispersion attribute was used to detect the fluid content of gas in sandstone. Based on this research, it turns out that it shows effective results in mapping the presence of saturated gas zones in the carbonate pores. In the end, the results of this study will be able to map the presence of saturated gas zones in carbonate reservoir.
Analysis of Ground Shear Strain (GSS) In Mapping, Liquefaction Vulnerability Potential Using HVSR (Horizontal To Vertical Spectral Ratio) Method. Case Study: Sepaku Subdistrict, North Penajam Paser Regency, East Kalimantan
IOP conference series, May 1, 2022
East Kalimantan has been designated as the new Capital Province of Indonesia. The criteria for de... more East Kalimantan has been designated as the new Capital Province of Indonesia. The criteria for determining the relocation of the nation's capital have passed various studies in the placement of a new state capital, one of which is by reviewing disaster aspects such as the risk of earthquakes, volcanoes and tsunamis. Based on historical records of earthquakes that have occurred, East Kalimantan is not a completely safe area from potential earthquakes or tsunamis. By using the HVSR method, the authors tried to determine the value of Ground Shear Strain (GSS) in the research area, namely Sepaku District, Penajam Paser Utara Regency. The result show that there were three zones namely Zona A, Zone B and Zone C had GSS values in Sepaku Subdistrict with landslides, soil compaction and liquefaction potential, namely 0.4 - 0.54. The result of HVSR interpretation curve are based on the phenomenon of the resulting ground shear strain value in accordance with the geological conditions in the research area of the Sepaku Subdistrict, Penajam Paser Utara Regency, East Kalimantan in characterizing the soil profile in the study area.
IOP conference series, Aug 1, 2019
Ultrasonic travel-time tomography using laboratory model were performed in this preliminary study... more Ultrasonic travel-time tomography using laboratory model were performed in this preliminary study. The measurement was calibrated using a known velocity laboratory model representing an iron with P-wave velocity (Vp) 5920 ms-1. Source and receiver transducers were equally spaced around the model. In the first measurement, the source position was at point 1, and receivers at points 2 to 16. In the second measurement, the source position was at point 2, and receivers at points 3 to 1. The measurements were repeated, and a total of 240 ray path were recorded. Then, the travel-time data inverted and reconstructed to get tomogram using a MSIRT (Modified Simultaneous Iterative Reconstruction Technique) algorithm. Each pixel tomogram represents a point velocity at ray path intersections. It is important to have at least one intersection for each pixel, so each pixel represents an average velocity. The use of robotic instrument provides precise and efficient results in data measurements despite errors between 1% and 3% at the time of motor rotation. The ultrasonic tomography using robotics equipment proves to be helpful in obtaining accurate measurement.
IOP conference series, Aug 14, 2019
Refraction seismic tomography is a geophysical method that is able to image shallow subsurface ve... more Refraction seismic tomography is a geophysical method that is able to image shallow subsurface velocity variation. Common application of this method is for Civil Engineering include near-surface problem such as weathering zone and bedrock. In this study, refraction seismic tomography was using Wavepath Eikonal Traveltime (WET) inversion. This method is performed by software Rayfract TM. The initial model is generated by Delta-tV method and smoothing inversion. The Delta-tV method obtain a 2D initial model, while the smoothing inversion obtain a 1D initial model. The forward modelling is done by finitedifference solution using Eikonal equation to obtain the ray tracing. Then WET inversion will obtain the subsurface model. The imaging result is able to show the thickness of weathering layer and the depth of the bedrock. The tomographic interpretation indicates the thickness of weathering layer is 2-10 meter, while the bedrock presence at depth 7-35 meter from the surface.
Proc. Indon Petrol. Assoc., 33rd Ann. Conv., Mar 9, 2018
Improving appearance and continuity of reflection seismic data by applying Common Offset Common R... more Improving appearance and continuity of reflection seismic data by applying Common Offset Common Reflection Surface (CO CRS) Stack method is presented in this paper. This method is based on summing up correlated events in the multi coverage data. To prove the effectiveness and advantages of this method a synthetic study is used.
Journal of physics, 2020
In a system of spherical particles which is entirely immersed in fluid, an intruder is let free f... more In a system of spherical particles which is entirely immersed in fluid, an intruder is let free fall into the particles bed consisted of 220 particles with height about 13 particles diameter and width about 15 particles diameter, both are in average. The system is placed in a container with height of 40 cm and width of 15 cm. Bed particles have the same diameter of 1 cm, while the intruder has 4 cm. Water is the fluid with density of 1 g/cm 3 and viscosity of 8.90×10-4 Pa•s, which is assumed to constant during the simulation. Intruder initial height is always the same and bed particles are let to be relaxed for about 2 s from its initial random configuration of 20×11 in height and width of bed particle diameter, before the intruder is dropped into the system. Bed particles has always the same density about 2 g/cm 3 , while intruder density ρ int is varied from 2 to 4.5 g/cm 3 with increment of 0.5 g/cm 3. It is observed that higher ρ int gives higher penetration depth after the density of 2.5 g/cm 3. Density of 4.5 g/cm 3 and beyond will give similar final result, since the intruder already reached bottom of the container. An empirical model for penetration depth as function of ρ int is proposed.
Journal of Applied Geophysics, Sep 1, 1996
We have developed a new method to detect a fault structure under a near-surface low velocity laye... more We have developed a new method to detect a fault structure under a near-surface low velocity layer (LVL) by seismic tomography. The field study showed that the tomography image reconstructed using borehole-surface configuration had a different result from that of using a crosshole configuration. The image reconstructed by using a borehole-surface configuration showed a decrease in seismic velocities along boreholes, and also the tomogram result using both configurations can not detect the subsurface fault structure. These phenomena are caused by the low velocity layer (LVL) at the top of investigation area. The basic idea hard is based on a downward continuation principle. By knowing the thickness of the LVL and the top of bedrock enables us to place 'virtual receiver' and/or 'virtual source' below the LVL. In this way, we can reconstruct the image by various tomographic methodologies. As an advantage, this method is easy to be use with the aid of ray tracing methodology. It can also reduce the effect of the near-surface LVL and can maximize the reconstructed image. The final result of our synthetic images by ILST, SIRT, and modified SIRT shows high accuracy and resolution for detection of fault structure under the low velocity layer.
Improving appearance and continuity of reflection seismic data by applying Common Offset Common R... more Improving appearance and continuity of reflection seismic data by applying Common Offset Common Reflection Surface (CO CRS) Stack method is presented in this paper. This method is based on summing up correlated events in the multi coverage data. To prove the effectiveness and advantages of this method a synthetic study is used.
Seismic reservoir characterization of gas-sand deposits in the Kutei basin, Indonesia
IOP conference series, Oct 1, 2021
Kutei Basin has the second largest hydrocarbon reserve in Indonesia. In addition to the Miocene i... more Kutei Basin has the second largest hydrocarbon reserve in Indonesia. In addition to the Miocene inversion related structural traps, slope-fan and channel stratigraphic traps are also important traps in this basin. To guide stratigraphic traps explorations in the basin, the seismic stratigraphy, attributes, and AI inversion methods are integrated to identify and map the reservoir seismic facies, porosity, and pore-fluid. Well data indicates that the studied reservoirs are filled by gas. Seismic data shows that there are two main gas-sand reservoirs corresponding to strong amplitude anomaly. Seismic stratigraphy analysis, guided by seismic attributes, shows that these gas-sand reservoirs were deposited in the channel and local fan facies. The AI inversion is applied to identify and map the porosity and pore-fluid of these two sand reservoirs. Future well locations are identified by integrating the facies, porosity, and pore-fluid maps.
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Papers by Teuku Abdullah Sanny