Ahmad, Zaenudin (2010) TIME-LAPSE MICROGRAVITY UNTUK MONITORING DEFISIT MASSA RESERVOIR PANASBUMI KAMOJANG. Jurnal Sains MIPA, 16 (1). pp. 47-56. ISSN 1978-1873

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Abstract

Geothermal field is a dynamic system. The exploitation of geothermal vapour causes change of some physical parameters, such as reservoir mass. Time-lapse microgravity method is one of the methods applied to monitor the mass defisit in Komajang geothermal field. The microgravity measurements have been done three times during 2006-2007 and the elevation change were measured with geodetic GPS. Based on the anomaly map time-lapse microgravity analysis, the mass defisit area (dry out) is shown by negative time-lapse microgravity (-) and the addition of water mass-reservoir injection (recharge) is represented by positive time-lapse microgravity (+). The negative time-lapse microgravity anomaly is represented by negative density (-) and vice versa. The big negative anomaly in the period of July 07 - June 06 was in the west of the field, in the area of rim structure and predicted due to the well production in KMJ-22, KMJ-28, KMJ-37, KMJ-41, KMJ-42, KMJ-27 and KMJ-65. The cutlet of 3D inversion map in the depth of 1000m showed the change the negative density mass up to -0.02 - -0.04 g/cm3. This result proved that the number of injection through injection well of KMJ-35 and KMJ-46 was not effective. The positive time-lapse microgravity anomaly represents the accumulation of injection water from injection well and/or the meteoric water accumulation which run through the faults. The presence of fluid flow in the reservoir is made clear by the result of analysis of tracer injection and micro earth quake. Keywords: time-lapse microgravity, monitoring, mass defisit

Item Type: Article
Subjects: Q Science > QE Geology
Divisions: Fakultas Teknik (FT) > Prodi Teknik Geofisika
Depositing User: AHMAD ZAENUDIN ZAENUDIN
Date Deposited: 29 Apr 2019 07:54
Last Modified: 29 Apr 2019 07:54
URI: http://repository.lppm.unila.ac.id/id/eprint/11116

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