Aplikasi Simultaneous Joint Inversion Data Audiomagnetotelurik dan Gayaberat untuk Identifikasi Intrusi pada Lapangan "Z"

Thayyibah, Urbatut (2021) Aplikasi Simultaneous Joint Inversion Data Audiomagnetotelurik dan Gayaberat untuk Identifikasi Intrusi pada Lapangan "Z". Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Pembuatan model intrusi bawah permukaan menggunakan metode geofisika
melibatkan parameter fisis batuan. Setiap metode geofisika mengukur
parameter fisis batuan yang berbeda. Dua metode geofisika yaitu Metode
Audiomagnetotelurik dan Metode Gayaberat digunakan untuk identifikasi
adanya intrusi pada area penelitian, namun pada model hasil kedua metode
tersebut berbeda sehingga dibutuhkannya model batasan untuk membantu
dalam proses identifikasi intrusi. Integrasi data diterapkan pada penelitian ini
dengan menggunakan Simultaneous Joint Inversion (SJI). Integrasi ini
menggunakan petrophysical link sebagai penghubung pada kedua parameter
fisis yaitu densitas dan resistivitas. Parameter yang digunakan sebagai
penghubung yaitu porositas, konversi parameter dari densitas ke porositas
menggunakan porosity-density relationship dan resistivitas ke porositas
memanfaatkan Hukum Archie. Pada penelitian ini didapatkan hasil berupa
model densitas, resistivitas hasil inversi dan model porositas. Dari model
porositas yang didapatkan, menunjukkan bahwa pada area penelitian memiliki
range porositas 0.2% hingga 0.7%. Kesesuaian model akhir dengan model
awal pada setiap sayatan yaitu 0.4275 pada sayatan 1 S-N, 0.5094 pada sayatan
2 S-N, dan 0.6274 pada sayatan 1 B-T, nilai rmse tersebut menunjukkan
kesesuaian model awal dengan model akhir hasil Simultaneous Joint Inversion
(SJI). Pada model hasil Simultaneous Joint Inversion SJI ditemukan adanya
pengaruh antar model awal densitas dengan resistivitas sehingga terdapat
beberapa kemiripan pola pada model hasil Simultaneous Joint Inversion (SJI).
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Making subsurface intrusion models using geophysical methods involves rock
physical parameters. Every geophysical method measures different rock
physical parameters. Two geophysical methods, Audiomagnetotelluric Method
and the Gravity Method, were used to identify the presence of intrusions in this
research area, but in the model, results of two methods were different so that a
boundary model was needed to assist in the intrusion identification process.
Data integration was applied in this study using Simultaneous Joint Inversion
(SJI). This integration used a petrophysical link as a link to the two physical
parameters, density and resistivity. The parameter used as a connector was
porosity, conversion of parameters from density to porosity using the porosity�density relationship, and resistivity to porosity using Archie's Law. In this
study, the results were obtained in the form of density models, resistivity
inversion results, and porosity models. From the porosity model obtained, it
shows that the research area has a porosity range of 0.2% to 0.7%. With the
rmse value of the inversion results were 0.4275 in the 1 S-N incision, 0.5094 in
the 2 S-N incisions, and 0.6274 in the 1 W-E incision, the rmse value indicates
the suitability of the initial model with the final Simultaneous Joint
Inversion (SJI) model. In the SJI model, it was found that there was an
influence between the initial density and resistivity models so that there were
several similar patterns in the Simultaneous Joint Inversion (SJI) model
results.

Item Type:	Thesis (Undergraduate)
Uncontrolled Keywords:	Audiomagnetotelluric, Gravity, Intrusion, Simultaneous Joint Inversion, Audiomagnetotelurik, Gayaberat, Intrusi.
Subjects:	Q Science > QE Geology > QE601 Geology, Structural T Technology > T Technology (General) > T57.5 Data Processing
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Geophysics Engineering > 33201-(S1) Undergraduate Thesis
Depositing User:	Urbatut Thayyibah
Date Deposited:	29 Aug 2021 16:48
Last Modified:	29 Aug 2021 16:48
URI:	http://repository.its.ac.id/id/eprint/90521

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