Ahmad, Zaenudin and Kadir,, W.G.A and SANTOSO,, D. and Raharjo,, I (2007) Identifikasi Zona Perubahan Massa Bawah Permukaan dan Subsidence Dengan Metode Gayaberatmikro 4D, Gradien Vertikal Gayaberatmikro dan Inversi Linier, Studi Kasus: Lapangan Panasbumi Kamojang. Jurnal Sains MIPA. ISSN 1978-1873

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Abstract

The major causes of gravity change are mass change in reservoir (subsurface) and vertcal ground movement (subsidence). While the observed gravity change, called as time-lapse microgravity anomaly, is as superposition of all the causes, hence how to identify each source is very important because some of causes could have similar response. As example is increase of subsurface density (mass) and subsidence. In order to minimaize this uncertainty, time-lapse vertical gradient microgravity associated with its time-lapse microgravity is analyzed. Microgravity ang vertical-gradient measurement has been conducted at 87 station which distributed in geothermal field of Kamojang and anlyzed to identify subsurface source. The time-lapse microgravity anomaly of June-November 2006 periode showed the anomaly value in range of -240 to 120 microgal and vertical-gradient in the range of -200 to 240 microgral. The time-lapse microgravity anomaly of June-November 2006 periode showed the anomaly value in range of -240 to 120 microgal that relate with the existance of density change in the range of -0.25 to 0.30 g/cc. This density contrast could be used as a representation of not only for fluid and pressure increase for positive density contras but also fluid and pressure decrease for negative density contrast.

Item Type: Article
Subjects: Q Science > QC Physics
Divisions: Fakultas Teknik (FT) > Prodi Teknik Geofisika
Depositing User: AHMAD ZAENUDIN ZAENUDIN
Date Deposited: 17 Feb 2020 03:46
Last Modified: 17 Feb 2020 03:46
URI: http://repository.lppm.unila.ac.id/id/eprint/17546

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