Analisis Saturasi Fluida Uap Dengan Metode Local Earthquake Tomography Pada Lapangan Panas Bumi ‘X’

Tresna Nagari, Meidi Yahnti (2021) Analisis Saturasi Fluida Uap Dengan Metode Local Earthquake Tomography Pada Lapangan Panas Bumi ‘X’. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Pada reservoir panas bumi, tomografi dapat menggambarkan pergantian cairan pori dengan uap melalui distribusi data anomali kecepatan gelombang P dan S, dan rasio Vp/Vs. Salah satu metode tomografi ialah local earthquake tomography yang baik digunakan pada area geothermal yang aktif secara seismik, karena peristiwa micro earthquake terdistribusi dengan baik pada reservoir dan zona produksi.Pada penelitian ini akan dilakukan analisis saturasi fluida lapangan panas bumi dari model 3D distribusi Vp, Vs, dan rasio Vp/Vs hasil metode local earthquake tomography yang dapat dengan baik mencitrakan zona fluida dan penipisan reservoir. Proses tomografi pada penelitian ini melalui uji resolusi dengan metode checkerboard kemudian dilakukan proses inverse modelling (pemodelan ke belakang) parameter kecepatan gelombang P dan S, dan hasil relokasi hiposenter yang nantinya akan mendapatkan model kecepatan gelombang P dan S kemudian dilakukan iterasi. Didapatkan hasil dari uji resolusi checkerboard bahwa data yang dapat menunjukkan anomaly positif dan negatif dengan baik adalah daerah pada kedalaman 0-8 km. Hasil dari pengolahan data mendapatkan nilai anomali deviasi -2 sampai 1.8 terhadap distribusi model kecepatan gelombang P dan gelombang S, Diperoleh RMS Error yaitu 0.149 s untuk gelombang P dan 0.264 s. Anomali gelombang P yang rendah menandakan bahwa adanya medium tidak kompak berupa fluida panas gunung dan anomali gelombang S yang rendah menandakan pada daerah penelitian terdapat medium fluida. Menurut Gylfi dan Axel (1991) sistem panas bumi dominasi uap cenderung memiliki nilai rasio Vp/Vs yang rendah yaitu range antara 1-1.7. Nilai rasio Vp/Vs pada daerah penelitian berkisar antara 1 dan 1.488 dengan distribusi event micro earthquake (MEQ) pada nilai rasio Vp/Vs 1 – 1.2 yang cenderung rendah. mengindikasikan bahwa daerah penelitian terletak pada steam-saturated rock atau zona dominasi uap yang mengindikasikan bahwa pada daerah penelitian terdapat fluida dengan jenis saturasi fluida uap.
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In geothermal reservoirs, tomography can describe the exchange of pore fluid with steam through the distribution of P and S wave velocity anomaly data, and Vp/Vs ratio. One of the tomographic methods is local earthquake tomography, which is best used in seismically active geothermal areas, because micro earthquake events are well distributed in reservoirs and production zones. , and Vp/Vs ratio as a result of the local earthquake tomography method which can properly image fluid zones and reservoir depletion. The tomography process in this research is through a resolution test using the checkerboard method, then the inverse modeling process (backward modeling) of the P and S wave velocity parameters, and the results of the hypocenter relocation which will later get a P and S wave velocity model, then iterate. The results obtained from the checkerboard resolution test that the data that can show positive and negative anomalies well are areas at a depth of 0-8 km. The results of data processing get a deviation anomaly value of -2 to 1.8 to the distribution of the velocity model of the P wave and S wave, the RMS error obtained is 0.149 s for the P wave and 0.264 s. The low P wave anomaly indicates that there is an incompact medium in the form of hot mountain fluid and the low S wave anomaly indicates that the research area has a fluid medium. According to Gylfi and Axel (1991) steam-dominated geothermal systems tend to have low Vp/Vs ratio values in the range between 1-1.7. The value of the Vp/Vs ratio in the study area ranges between 1 and 1.488 with the micro earthquake (MEQ) event distribution at the Vp/Vs ratio of 1 – 1.2 which tends to be low. indicates that the research area is located in the steam-saturated rock or vapor-dominated zone which indicates that in the study area there is a fluid with a type of vapor fluid saturation.

Item Type:	Thesis (Undergraduate)
Uncontrolled Keywords:	Local Earthquake Tomography, Rasio Vp/Vs, Vp, Vs, Vp/Vs Ratio
Subjects:	Q Science > QE Geology > QE538.8 Earthquakes. Seismology T Technology > TN Mining engineering. Metallurgy > TN269 Prospecting--Geophysical methods
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Geophysics Engineering > 33201-(S1) Undergraduate Thesis
Depositing User:	Meidi Yahnti Tresna Nagari
Date Deposited:	26 Aug 2021 07:23
Last Modified:	26 Aug 2021 07:23
URI:	http://repository.its.ac.id/id/eprint/89607

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