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Fajril Ambia
Wave Inversion And Subsurface Fluid Imaging Research, Institut Teknologi Bandung.
Astronomy Computer Science & IT Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering

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Marine Seismic Tomography for Detecting Fracture and Void of Subsurface Seabed : a Theoretical Framework Development and Application of Wide-Band Fresnel Tomography Bagus E. B. Nurhandoko; Fajril Ambia; Kaswandhi Triyoso; M. Thurisina Choliq; Mahatman L. Budi; Asep Suhendi; Wahyu E. Abdianto
Indonesian Journal of Physics Vol 19 No 4 (2008): Vol. 19 No. 4, October 2008
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (965.921 KB) | DOI: 10.5614/itb.ijp.2008.19.4.2

Abstract

Fracture as well as void can generate unstable structure in offshore building. We use seismic tomography based on scattering wave instead of conventional raypath seismic tomography. Conventional raypath tomography usually needs dense source-receiver configuration as well as wide-angle measurement. Therefore, it will be high cost in field data acquisition. We propose scattering wavepath tomography by means of Fresnel interpolated wavepath (FIW) wide-band inversion. FIW is an interpolation between imaginary part of Rhytov scattering wavepath and raypath. Then, FIW is combined with wide band inversion procedure to handle sparseness configuration of measurement. By this method, smooth constraint is implemented more naturally by based on wave's spectrum. In this paper, we showed some applications of Wide-band inversion of FIW tomography in imaging fracture and void in marine carbonate sea bed.
Characterization of Subsurface Coal Using Seismic Tomography : a Case Study in Muara Enim South Sumatera Bagus E. B. Nurhandoko; Syahrul Mubarok; Indriani Sukmana; Fajril Ambia; Budi Sulistyanto; Syafrizal Syafrizal; Y. Wiyanto; Hussein Rudiyanto
Indonesian Journal of Physics Vol 20 No 2 (2009): Vol. 20 No. 2, April 2009
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (402.656 KB) | DOI: 10.5614/itb.ijp.2009.20.2.5

Abstract

In recent years, coal as well as coal bed methane becomes important energy resources. Therefore, the characterization of coal seam is also important in predicting the quality, porosity and pore’s fluid of CBM’s reservoir. Seismic wave is very important parameter to characterize reservoir’s properties of coal bed methane as well as quality of coal. In this paper, we show methodology to image the subsurface velocity using seismic tomography. It is very useful for characterizing the coal’s seam as well as to detect the position of intrusion body. A case study was carried out in Suban Block, Muara Enim Sumatera. This coal mining block contains igneous rock intrusion which becoming main control of coal’s quality. Coal which is close with intrusion body usually has better quality than far zone. To acquire the data, we used 48 channels of seismic recorder controlled by telemetry for controlling the shot and first break. Then, data are processed by Fresnel interpolated wave-path (FIW) wide-band inversion tomography. The results show that the intrusion body can be imaged clearly and the seam coal can be delineated from well information. The information in well controls are quite match with tomography results.
Co-Authors Asep Suhendi Bagus E. B. Nurhandoko Bagus E. B. Nurhandoko Budi Sulistyanto Hussein Rudiyanto Indriani Sukmana Kaswandhi Triyoso M. Thurisina Choliq Mahatman L. Budi Syafrizal Syafrizal Syahrul Mubarok Wahyu E. Abdianto Y. Wiyanto