Aplikasi Simultaneous Joint Inversion Data Magnetotellurik Dan Gravitasi Pada Rekonstruksi Model Kecepatan Di Daerah Sub-Vulkanik.

Hibatullah, Muhammad Irsyad (2019) Aplikasi Simultaneous Joint Inversion Data Magnetotellurik Dan Gravitasi Pada Rekonstruksi Model Kecepatan Di Daerah Sub-Vulkanik. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Reservoir sub-vulkanik merupakan salah satu hal menarik dalam dunia eksplorasi cadangan migas di masa mendatang. Tantangan dalam eksplorasi pada reservoir sub vulkanik adalah keterbatasan metoda seismik dalam melakukan pencitraan bawah permukaan pada reservoir sub-vulkanik, hal itu dikarenakan keberadaan lapisan vulkanik yang terletak diatas reservoir sub-vulkanik memiliki kecepatan yang kompleks dan dominasi komponen frekuensi rendah sehingga metode konvensional seperti Dix Conversion tidak cukup akurat dalam memodelkan profil Vp di daerah sub-vulkanik. Oleh karena itu dibutuhkan integrasi metode gravitasi dan magnetotellurik dimana pada pengolahan inversi secara terpisah metode MT 1.5D menunjukan bahwa MT sensitif terhadap kehadiran fasies vulkanik tetapi tidak cukup sensitif terhadap keberadaan basement. Sedangkan metode gravitasi sensitif terhadap keberadaan basement tetapi tidak cukup sensitif dalam menggambarkan fasies vulkanik. kekurangan setiap metode dalam mencitrakan reservoir sub-vulkanik dikarenakan sifat non uniqueness dari setiap metode. Simultaneous Joint Inversion(SJI) merupakan pengolahan inversi secara bersama dan simultan dengan memanfaatkan hubungan empirik antar parameter fisis sehingga pengolahan dengan SJI dapat mereduksi non uniqueness setiap metode. Oleh karena itu dilakukan pengolahan SJI metode gravitasi dan magnetotellurik untuk meningkatkan citra reservoir sub-vulkanik. pada penelitian ini didapatkan hasil berupa model yang dapat mencitrakan anomali dari fasies vulkanik dan basement dengan RMSE Vp hasil konversi dari profil resistivitas SJI sebesar 0.21, RMSE Vp hasil konversi dari profil densitas SJI sebesar 0.22, dan RMSE Vp Dix Conversion sebesar 0.33. sehingga dapat disimpulkan bahwa metode SJI Gravitasi dan Magnetotellurik dapat meningkatkan citra Vp di reservoir sub-vulkanik dan dapat mereduksi non uniqueness masing-masing metode. ================================================================================================ Sub volcanic reservoir is one of the interesting things in the world of reserves oil and gas exploration in the future. The challenge in exploration in sub-volcanic reservoirs is the limitation of seismic methods in conducting subsurface imaging of sub-volcanic reservoirs, this is because the presence of volcanic layers that located above sub-volcanic reservoirs has complex speeds, so conventional methods such as Dix Conversion are not accurate enough to model Vp profiles in the sub-volcanic area. Therefore in this thesis, a speed model have reconstructed with a non seismic approach in the form of Simultaneous Joint Inversion processing on MT and Gravity data. Separating the inversion processing MT 1.5D method shows that MT is sensitive to the presence of volcanic facies but is not sensitive enough to the presence of basements. Meanwhile the gravity method is sensitive to the presence of basements but is not sensitive enough to describe volcanic facies. Therefore Simultaneous Joint Inversion processing is carried out by adding the equation of the empirical relationship of physical parameters that can construct the solution from inversion so that the model can image the anomaly of the volcanic facies and basement. The results of this thesis are that the profile of Vp from the SJI resistivity profile has a RMSE value of 0.21, the Vp profile of the conversion from the SJI density profile has RMSE of 0.22, and the Vp profile through the Dix Conversion method has an RMSE of 0.33 therefore a non seismic approach in modeling the Vp profile of the interval in the sub-volcanic environment shows better results than the conventional method through Dix Conversion, so that the non-seismic approach through SJI can be an alternative in imaging Vp profiles in sub-volcanic environments.

Item Type: Thesis (Undergraduate)
Additional Information: RSGf 551.22 Hib a-1 2019
Uncontrolled Keywords: Gravitasi, magnetotellurik , simultaneous joint inversion, reservoir sub-vulkanik
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
Q Science > QA Mathematics > QA184 Algebra, Linear
Q Science > QE Geology > QE538.5 Seismic waves. Elastic waves
Q Science > QE Geology > QE539.2.S4 Seismic models
Divisions: Faculty of Civil Engineering and Planning > Geophysics Engineering > 33201-(S1) Undergraduate Thesis
Depositing User: muhammad irsyad hibatullah
Date Deposited: 07 Jul 2021 06:01
Last Modified: 07 Jul 2021 06:01
URI: https://repository.its.ac.id/id/eprint/60795

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