Low-frequency spectral analysis on passive seismic data to identify the thickness of volcanic rock layer in Majalengka, Indonesia

S. R. Wibowo, A. H. Pratama, F. Adlan, Supriyanto

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

The research have been conducted for identifying the thickness of volcanic rock layer that prohibits the hydrocarbon potential in Majalengka District, Indonesia by using passive seismic method. The potential reservoir is expected on sedimentary rock of Cinambo Formation below the volcanic layer. The hydrocarbon potential are proven by the presence of oil seepage in the northern side of research area. Active sesimic survey showed unsatisfactory results because the volcanic layer has scaterred the seismic wave propagation. This study aims to strengthen the previous results and to determine the thickness of volcanic rock layer. Passive seismic is a method that can detect the thickness of layer by utilizing low frequency. Measurements carried out on an area of 15 km-square with acquisition time around 1 - 2 hours for each station. The equipment is a digital broadband seismometer with 3-axis components. The horizontal to vertical spectral ratio (H/V Spectral Ratio) showed that the natural frequency signal can correlate to the thickness of volcanic rock layer. The thickness of volcanic rock layer have been estimated using the Bard (2000) equation about the relation of natural frequency and the thickness of bedrock. A data inversion and 2D/3D modelling has been performed by using velocity model to show the thickness of volcanic rock layer through a velocity value. The results showed that the volcanic rock layer on the research area varies from 20 meters to 60 meters.

Original languageEnglish
Title of host publicationProceedings of the 3rd International Symposium on Current Progress in Mathematics and Sciences 2017, ISCPMS 2017
EditorsRatna Yuniati, Terry Mart, Ivandini T. Anggraningrum, Djoko Triyono, Kiki A. Sugeng
PublisherAmerican Institute of Physics Inc.
ISBN (Electronic)9780735417410
DOIs
Publication statusPublished - 22 Oct 2018
Event3rd International Symposium on Current Progress in Mathematics and Sciences 2017, ISCPMS 2017 - Bali, Indonesia
Duration: 26 Jul 201727 Jul 2017

Publication series

NameAIP Conference Proceedings
Volume2023
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

Conference3rd International Symposium on Current Progress in Mathematics and Sciences 2017, ISCPMS 2017
CountryIndonesia
CityBali
Period26/07/1727/07/17

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