Open Access Open Access  Restricted Access Subscription or Fee Access

Structural Model of Kamojang Geothermal Field, West Java, Indonesia Based on Vp, Vs and Vp/Vs

B. Mujihardi, S. Widiyantoro, A. D. Nugraha, D. S. Widarto, A. Sukotjo

Abstract



This paper describes an attempt to apply a tomographic imaging technique to the Kamojang geothermal field located in West Java, Indonesia using microseismic event data. In this study, initial locations of microseismic events were first determined using the Geiger Adaptive Damping (GAD) method. We then improved the locations of these events by relocating hypocenters using a double-difference event location technique. Our results show that the relocated events are concentrated in the northeastern, central, and southwestern parts of the seismographic station network. The events seem to be clustered at depths of 0-2 km below the mean sea level (MSL) in the northeastern part, 0-1 km below MSL in the central part, and 0-8 km below MSL in the southwestern part of the studied area. Furthermore, we derived a Vp/Vs ratio model from 3D seismic tomographic imaging results. The Vp/Vs ratio clearly depicts a low anomaly close to the center of the study area, which may be related to a steam-dominated reservoir. In addition, we proposed a conceptual model for the Kamojang geothermal reservoir constructed from the Vp/Vs ratio model.

Keywords


Geothermal, microseismic, GAD, double-difference, 3D seismic velocity.

Full Text:

PDF


Disclaimer/Regarding indexing issue:

We have provided the online access of all issues and papers to the indexing agencies (as given on journal web site). It’s depend on indexing agencies when, how and what manner they can index or not. Hence, we like to inform that on the basis of earlier indexing, we can’t predict the today or future indexing policy of third party (i.e. indexing agencies) as they have right to discontinue any journal at any time without prior information to the journal. So, please neither sends any question nor expects any answer from us on the behalf of third party i.e. indexing agencies.Hence, we will not issue any certificate or letter for indexing issue. Our role is just to provide the online access to them. So we do properly this and one can visit indexing agencies website to get the authentic information.