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All Journal Jurnal Riset dan Kajian Pendidikan Fisika Journal of Engineering and Technological Sciences Indonesian Journal of Physics (IJP)
Fauzi, Umar
Departemen Fisika, FMIPA Institut Teknologi Bandung
Astronomy Computer Science & IT Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Physics

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A Preliminary Result of Seismoelectric Responses Study on Shallow Fluid-Saturated Layer: Numerical Modeling Using Transfer Function Approach Alamta Singarimbun; Harry Mahardika; Wahyu Srigutomo; Umar Fauzi
Indonesian Journal of Physics Vol 19 No 3 (2008): Vol. 19 No. 3, July 2008
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (339.571 KB) | DOI: 10.5614/itb.ijp.2008.19.3.1

Abstract

Seismoelectric phenomena occurs when a seismic wave propagating in a fluid-saturated medium and crossing an interface of different fluid-saturated mediums that induces electrical field or cause radiation of an electromagnetic wave where only the electric part is being measured. In this paper, we present our research progress on seismoelectric imaging of shallow fluid-saturated layers. The progress mainly discusses on our finite-difference algorithm which provides an alternative method to simulate seismic wave propagation in fluid saturated porous media generating electric fields through an electrokinetic mechanism called seismoelectric coupling. The target of this numerical simulation is to see whether the seismoelectric responses of coseismic field and interface boundary effect can be image on the seismoelectrogram. The simulation begins with the calculation of seismic displacement by using the classical homogeneous formulation. Next, we calculate the seismoelectric responses using the seismoelectric transfer function. The algorithm is then used to simulate seismoelectric responses created from various conditions of finite-infinite and finite-infinite sand-clay model, surface to downhole and crosshole configurations.
Resistivtiy Structure in Kamojang Geothermal Field Derived from CSAMT Data Enjang Jaenal Mustopa; Wahyu Srigutomo; Doddy Sutarno; Umar Fauzi
Indonesian Journal of Physics Vol 22 No 1 (2011): Vol. 22 No. 1, January 2011
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (307.747 KB) | DOI: 10.5614/itb.ijp.2011.22.1.4

Abstract

Controlled-source audio frequency magnetotelluric (CSAMT) survey consisting of 60 soundings has been carried out in the Kamojang geothermal field to delineate resistivity structure correlated to the present geothermal reservoir. The transmitter site was located about 3 − 5 km in the south-west of the survey area. The sounding sites were distributed irregularly and the distance between each of them varied from 200 to 500 m, covering the Kamojang Geothermal area. The two dimensional (2D) inversion scheme was applied to interpret the CSAMT data. The results show that the subsurface resistivity structures in the Kamojang geothermal field consists of three types of resistivity features correlated to the existing geothermal reservoir in the area, that is, the overburden (first layer) having resistivity value of 30 – 150 ohm.m and thickness of 30 to 100 m overlaying the intermediate (second) layer which has an extremely low resistivity of 3 – 10 ohm.m with 500 – 1200 m thick. This low resistivity layer can be considered as a hydrothermal alteration zone comprising the impermeable layer or sealing cap rock. Finally, the third layer which is relatively more resistive than the second layer with resistivity of 30 − 100 ohm-m. From the 3D view of the low resistivity anomaly (<10 ohm.m) considered as a hydrothermal alteration zone, it is obtained that altered zone is deep in the south-west and becomes shallow in the north-east of the area.
Co-Authors A. S. Bahri Alamta Singarimbun Bagus E. B. Nurhandoko Budi Dermawan Doddy Sutarno Eko Januari Wahyudi Enjang Jaenal Mustopa Fourier Dzar Eljabbar Latief Gunawan, Indra Hamdi Rifai Judhistira Aria Utama Kadir, Wawan Gunawan Abdul Khumaedi Sastrawiharja Linus . Pasasa Mahardika, Harry Mulyadi Mulyadi Pradita Adnan Wijaya Satria Bijaksana Satria Bijaksana Susanti Alawiyah Taufiq Hidayat Thoha Firdaus Wahyu Srigutomo Wahyu Srigutomo Wahyudi, Eko Januari Wawan Gunawan Abdul Kadir Wijaya, Pradita Adnan