Pencitraan Rembesan Gas Menggunakan Metode VLF-EM: Studi Kasus di Kayangan Api Bojonegoro, Jawa Timur

Nurdiansyah, Muhammad Dwi (2017) Pencitraan Rembesan Gas Menggunakan Metode VLF-EM: Studi Kasus di Kayangan Api Bojonegoro, Jawa Timur. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Salah satu rembesan gas alam ke permukaan tanah terdapat di Kayangan Api. Rembesan gas ini umumnya melalui patahan. Metode geofisika yang sesuai untuk mencitrakan patahan ini adalah metode VLF-EM. Data yang terukur pada metode VLF-EM biasanya terkontaminasi oleh noise. Noise Assisted-Multivariate Empirical Mode Decomposition (NA-MEMD) digunakan untuk memisahkan noise pada data VLF-EM (inphase dan quadrature). Data VLF-EM ini digunakan untuk interpretasi kualitatif dan kuantitatif. Interpretasi ini menunjukkan bahwa retakan yang mengontrol rembesan gas di daerah penelitian dapat tercitrakan dengan baik hingga kedalaman 30 meter (efek skin depth pada metode EM). Retakan ini memiliki arah Timur Laut-Barat Daya. Retakan yang mengontrol rembesan gas di daerah penelitian termasuk kedalam jenis rembesan makro. =================================================================
Kayangan Api is one of the natural gas seepage phenomena. This seepages are usually occurred inside the fault path. The geophysical method that usually used on fault imaging is VLF-EM method. The measured data of the VLF-EM is usually contaminated with noise. So in this research, Noise Assisted Multivariate Empirical Mode Decomposition (NA-MEMD) has been applied on VLF-EM data (Inphase & quadrature) as a noise filter. After that, the filtered VLF-EM data is used on the interpretation (qualitatively & quantitatively). Based on the result, the fractures that control the gas seepage in the area are well-imaged until 30m depth (due to the limited skin depth effect of the electromagnetics method). The direction of the fracture is from northeast-southwest. The fracture that control the gas seepage is classified as the macro seepage.

Item Type:	Thesis (Undergraduate)
Uncontrolled Keywords:	Filter Fraser, Filter K-Hjelt, Kayangan Api, NA-MEMD, Resistivitas, Rembesan Gas, VLF-EM.
Subjects:	Q Science > QC Physics Q Science > QE Geology Q Science > QE Geology > QE601 Geology, Structural
Divisions:	Faculty of Mathematics and Science > Physics > 45201-(S1) Undergraduate Thesis
Depositing User:	Nurdiansyah M. Dwi
Date Deposited:	04 Dec 2017 04:37
Last Modified:	27 May 2019 04:32
URI:	http://repository.its.ac.id/id/eprint/45185

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