2D Joint Inversi Data Seismik Refraksi dan 2D Resistivity Dalam Pemodelan Near Surface Imaging Dengan Menggunakan Petrophysical Clustering

Mirambang, Sulthan Abiyyu Priambodo (2019) 2D Joint Inversi Data Seismik Refraksi dan 2D Resistivity Dalam Pemodelan Near Surface Imaging Dengan Menggunakan Petrophysical Clustering. Other thesis, Intitut Teknologi Sepuluh Nopember.

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Abstract

Strategi dalam melakukan joint inversi data geofisika menjadi sangat efisien dengan kombinasi data set yang berbeda. Namun ketika melakukan proses joint inversi dibutuhkan parameter penghubung kedua data set. Saturasi merupakan fungsi resisitivitas berdasarkan persamaan Archie, sedangkan saturasi merupakan fungsi dari persamaan Wyllie. Pada penelitian ini mengkombinasikan seismik refraksi dan 2D resistivitas dalam algoritma join petrophysical inversion. Algoritma joint inversi tersebut diaplikasikan pada pemodelan near surface. Skema joint inversion akan dilakukan uji pada data sintetik. Model sintetik tersebut merupakan simulasi dari pemodelan near surface yang dipengaruhi oleh efek saturasi yang berbeda dalam lapisan yang sama. Efek dari adanya zona tersebut akan menimbulkan zona lemah pada lapisan yang dangkal. Permasalahan tersebut dapat menyebabkan terjadi peristiwa amblasnya jalan. Inversi individual dilakukan pada Metode seismik refraksi. Hasil inversi dapat memberikan gambaran yang baik akan batas-batas lapisan, namun tidak dapat menggambar zona dengan low velocity zone. Dilain sisi hasil dari proses inversi individual metode 2D resistivitas dapat memberikan gambaran yang baik dengan adanya kontras resistivitas yang tinggi. Skema joint petrophysical inversion pada data sintetik tersebut menghasilkan hasil yang lebih baik dibandingkan hasil inversi individual. Hasil dari proses joint petophysical inversion memberikan gambaran yang lebih baik terhadap batas antar lapisan maupun adanya zona yang memiliki kontras nilai parameter geofisika yang tinggi
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The strategy in conducting joint inversion of geophysical data becomes very efficient with a combination of different data sets. However, when carrying out the joint inversion process, a second data set parameter is needed. Saturation is a resistivity function based on the Archie equation, while saturation is a function of the Wyllie equation. In this study combining refraction seismic and 2D resistivity in the petrophysical inversion join algorithm. The joint inversion algorithm is applied to near surface modeling. Joint inversion scheme will be tested on synthetic data. The synthetic model is a simulation of near surface modeling which is influenced by different saturation effects in the same layer. The effect of the existence of the zone will create a weak zone in the shallow layer. These problems can cause a collapse of the road to occur. Individual inversion is carried out on the seismic refraction method. The inversion results can give a good picture of layer boundaries, but cannot draw zones with low velocity zones. On the other hand the results of individual inversion processes in 2D resistivity methods can provide a good picture in the presence of high resistivity contrast. Joint petrophysical inversion schemes on synthetic data produce better results than individual inversion results. The results of the joint petophysical inversion process provide a better picture of the boundaries between layers as well as the existence of zones that have high contrast values of geophysical parameters

Item Type:	Thesis (Other)
Additional Information:	RSGf 551.22 Mir j-1 2019 3100019081341
Uncontrolled Keywords:	joint, petrophysical, refraksi, resistivitas
Subjects:	Q Science Q Science > QE Geology Q Science > QE Geology > QE539.2.S4 Seismic models
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Geophysics Engineering > 33201-(S1) Undergraduate Thesis
Depositing User:	Sulthan Abiyyu
Date Deposited:	19 Nov 2025 09:58
Last Modified:	19 Nov 2025 09:58
URI:	http://repository.its.ac.id/id/eprint/64689

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