Ahmad, Zaenudin (2013) STRIPPING FILTER IMPLEMENTATION FOR INTERPRETATION TIME-LAPSE MICROGRAVITY DATA KAMOJANG FIELD 2006-2007. PROCEEDINGS, 2nd ITB Geothermal Workshop 2013.

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Abstract

Filter stripping equation were derived from a prims model that was developed from Cordell’s (1985) and Aina’s (1994) equations. Simulation of synthetic data at filter stripping uses parameters of a model giving a large error. Therefore, filter stripping needs to be modified. The modification is done by adding a weighted factor (Ω) in the filter stripping equation. Weighted factor (Ω) range from 0.3 -0.7 related to complexity of object model. Growing complicated object model then weighted factor value getting smaller, and also do on contrary. Result show the addition of weighted factor can reduce error to 20- 50%. Implementation stripping filter can separate microgravity anomalies as a result of reservoir mass deficit due to exploiting of vapor and or addition of reservoir mass from geothermal injection wells from gravity anomaly as result of lowering of water table. Deficit district (dry-out) is show by negative microgravity time-lapse anomaly (-) and addition mass of injection water at reservoir (recharge) is show by positive microgravity time-lapse anomaly (+). Negative microgravity time-lapse anomaly is represented as negative change of density anomaly ( - ) and positive microgravity time-lapse anomaly (+) is as positive change of density. Based on time-lapse anomaly microgravity maps between period of July 07 to June 06, negative concentration anomaly locates in western field that is around rim structures. This can be related to activity of production wells in the area. Based on 3D cross section map at depth of 1100 m (+400 m asl), this area is represented by negative density from – 0.02 up to – 0.04 gram/cm3. This also proves that injection amounts through injection well in the area is not effective. Positive anomaly is represented by accumulation of injection water from injection well and or accumulation of water meteoric flowing through faults.

Item Type: Article
Subjects: Q Science > QC Physics
Divisions: Fakultas Teknik (FT) > Prodi Teknik Geofisika
Depositing User: AHMAD ZAENUDIN ZAENUDIN
Date Deposited: 03 Jul 2018 09:50
Last Modified: 03 Jul 2018 09:50
URI: http://repository.lppm.unila.ac.id/id/eprint/8341

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