APPLICATION OF TOMOGRAPHY DOUBLE DIFFERENCE TO DETERMINE 3D VELOCITY MODEL IN MUARA LABOH GEOTHERMAL FIELD

• Main Author: AGATHA NATANIA (NIM: 12313058), KANA
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/22749
• Institution: Institut Teknologi Bandung

Muara Laboh geothermal field is located in South Solok Regency, 150 km from <br /> <br /> <br /> <br /> <br /> Padang city. This field has been explored since 2007 and estimated to have a <br /> <br /> <br /> <br /> <br /> capacity of 220 Mw. In this field there are 6 wells and several geophysical data <br /> <br /> <br /> <br /> <br /> acquisition such as microseismic and magnetotelluric method has been performed. <br /> <br /> <br /> <br /> <br /> The Muara Laboh geothermal field status is on exploration stage and requires <br /> <br /> <br /> <br /> <br /> further information to enter the exploitation stage. Therefore the author models <br /> <br /> <br /> <br /> <br /> the velocity structure under the Muara Laboh reservoir. This study uses 135 <br /> <br /> <br /> <br /> <br /> microearthquakes data from September 14, 2010 to April 2, 2011 and 2692 <br /> <br /> <br /> <br /> <br /> microearthquakes from September 23, 2012 to December 22, 2013 with a total of <br /> <br /> <br /> <br /> <br /> 2827. A microseismic earthquake was recorded on 32 scattered station networks. <br /> <br /> <br /> <br /> <br /> To maximize the result of picking waveform, the data is processed using the <br /> <br /> <br /> <br /> <br /> Master Event Cross Correlation method to update the catalog data and get more <br /> <br /> <br /> <br /> <br /> accurate results. Furthermore, the author used TomoDD software to produce <br /> <br /> <br /> <br /> <br /> hypocenter relocation and the 3D velocity structure under Muara Laboh's <br /> <br /> <br /> <br /> <br /> geothermal reservoir. The results of the 3D velocity model can be used to <br /> <br /> <br /> <br /> <br /> determine the structure and fluid phase under Muara Laboh geothermal field.