Application of Double Difference Tomography Method to Determine The 3D Seismic Wave Velocity Structure of GoLF Geothermal Field
KeywordsGeothermal, Microseismic , TomoDD, Master Event Cross Correlation.
GoLF geothermal eld is located in South Solok Regency, 150 km SE of Padang city, West Sumatra.
Geology, geochemistry and geophysical surveys had been conducted since 2008. Geophysical survey which had been performed including microseismic and magnetotelluric surveys. Seismic velocity structure modelling need to be conducted in order to characterize geothermal reservoir.This study uses microseismic data recorded from 36 seismometers which installed in two time recording time ranges; from September 2010 to April 2011 and from September 2012 to December 2013, with microseismic events recorded respectively 135 and 2692 events. To maximize the result of picking waveform, the data is processed using the Master Event Cross Correlation method to update the catalog data and get more accurate arrival time. Furthermore, the author used TomoDD software to produce hypocenter relocation and the 3D velocity structure under GoLF's geothermal reservoir. The results of the 3D velocity model can be used to determine the structure and phase of the fluid under GoLF geothermal field.
Gunasekara, R.C., Foulger, G.R., dan Julian, B.R., 2003. Reservoir depletion at The Geysers geothermal area, California, shown by fourdimensional seismic tomography, J. Geophys. Res., Vol. 109, No. B3, 2134.
I.J., Alfiady, Bogie, I., Nur Izati, C., Azis, H., Hadi, J., 2013. Preliminary Geology Model of Muara Laboh : Facies and Porosity Assessment. Proceedings Indonesia International Geothermal Convention and Exhibition 2013.
Lees, J. M. dan H. Wu, 1999. Poissons ratio and porosity at Coso Geothermal Area, California. Journal of Volcanology and Geothermal Research, 95, 2000, 157-173.
Londono, J.M, Y. Sudo, 2002. Velocity structure and a seismic model for Nevado del Ruiz Volcano (Colombia). J. Volcano. Geotherm. Res. 119, 61-87.
Mori, J., 2008. Determination of dip direction for the 2007 Chuetsu-oki earthquake from relocation of aftershocks using arrival times determined by cross-correlation. Earth Planets Space, vol. 60, pp. 11171120.
R. Sanderson, J. Andrews, C. Boese dan A. Lucas, 2013. Final Basic Analysis Report On Muara Laboh Microearthquake Data for Geothermal Driling Targeting. Institut of Earth and Science Engineering.
Rosidi, H.M.D., Tjokrosapoetro, S. dan Pendowo, B., 1996. Geological Map Of The Painan And Northern Part Of The Muara Siberut Quadrangle,Sumatera.Pusat Penelitan Dan Pengembangan Geologi
Saputra, I.J., Alfiady, Bogie, I., Nur Izati, C., Azis, H., Hadi, J., 2013. Preliminary Geology Model of Muara Laboh : Facies and Porosity Assessment. Proceedings Indonesia International Geothermal Convention and Exhibition 2013.
Schaff, D.P. dan Waldhauser, F., 2005. Waveform Cross-Correlation-Based Dierential Travel-Time Measurements at theNorthern California Seismic Network. Bulletin of the Seismological Society of America, vol. 95, no. 6, pp. 24462461, December 2005, doi: 10.1785/0120040221
Sieh, K dan Natawidjaja, D., 2000. Neotectonics Of The Sumatran Fault, Indonesia. Journal Of Geophysical Research, Vol 105,No.B12, pp. 295-326.
Situmorang. J., Martikno R., Perdana A., Ganefianto, 2014. A Reservoir Simulation of the Muara Laboh Field, Indonesia, Proceedings 41st Workshop on Geothermal Reservoir Engineering Stanford University, Stanford, California, 2016 SGP-TR-209.
Waldhauser, F., 2001. HypoDD: A Program to Compute Double-Difference Hypocenter Locations (hypoDD version 1.0 - 03/2001). Open File Report 01-113.
Waldhauser, F., dan W. L. Ellsworth. 2000. A double-difference earthquake location algorithm: Method and application to the Northern Hayward Fault, California. Bull. Seism. Soc., 90, 1353-1368.
Wang, Z., Batzle, Michael L., dan Nur, Amos M., 1990. Effect of different pore fluids on seismic velocities in rock, Can. J. Explor. Geophys., 26(1 dan 2), pp. 104 112.
Zhang, H., dan C. H. Thurber., 2003. Users manual for tomoDD 1.1 (double dierence tomography) for determining event locations and velocity structure from local earthquake and explosions, draft, University of Wisconsin-Madison.
Zhang, H., dan C. H. Thurber, 2003. Double dierence tomography: The method and its application to the Hayward Fault, California: Bull. Seism. Soc. Am., 93,1875-1889.
This work is licensed under a Creative Commons Attribution 4.0 International License.
The copyright of all articles belongs to the authors. All other copyrights is held by the Journal