Dezulfakar, Hafidz (2016) Inversi Bersama Gelombang Pp Dan Ps (Joint Pp And Ps Inversion) Untuk Menganalisa Litologi Reservoir. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Penggunaan gelombang P (PP wave) dalam eksplorasi seismik kurang
mampu menggambarkan litologi khususnya pada daerah yang tersaturasi fluida.
Gelombang PS (converted wave) yang merupakan hasil pantulan gelombang P
menjadi gelombang S telah digunakan untuk mengatasi permasalahan tersebut
dengan menggunakan proses inversi yang mengkombinasikan kedua data
seismik PP dan PS secara bersamaan (joint inversion). Hasil joint inversion
berupa parameter impedansi akustik (impedansi P), impedansi shear (impedansi
S), densitas serta parameter turunan yaitu rasio Vp/Vs yang lebih sensitif
terhadap litologi dan fluida. Dilakukan dua alur penelitian, alur penelitian
pertama menggunakan data seismik PS stack PS time yang harus dilakukan
proses konversi domain waktu dari domain PS time menjadi domain PP time.
Hasil pada alur penelitian pertama memiliki hasil yang kurang baik dikarenakan
adanya keterbatasan pada proses konversi domain. Pada alur penelitian kedua
digunakan data seismik PS stack PP time yang menjawab keterbatasan pada alur
penelitian pertama. Sehingga didapat hasil inversi berupa parameter impedansi
P, impedansi S, densitas, dan rasio Vp/Vs dengan nilai korelasi terhadap sumur
secara berturut-turut adalah 0.955339, 0.936588, 0.923806 dan 0.781296.
Didapat sebaran litologi sandstone dan shale dari crossplot parameter impedansi
P dan impedansi S. Sedangkan litologi reservoir sandstone tersaturasi
hidrokarbon didapat dari crossplot antara parameter impedansi P dan rasio
Vp/Vs. Dengan demikian, reservoir sandstone tersaturasi hidrokarbon dapat
diperkirakan terletak di antara kedalaman marker sumur beta1 dan MF4 yaitu
pada kedalaman sekitar 1350 ms dan 1400 ms.
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he usage of P-wave (PP wave) on the seismic exploration provides poor
description of subsurface lithological conditions, especially in fluid gas
saturated areas. PS-wave (converted wave) which is the result of reflection of Pwaves
into S-waves has been used to solve these problems by using the inversion
process which combines with PP and PS seismic data simultaneously (joint
inversion). The results of joint inversion are acoustic impedance parameter (P
impedance), shear impedance (S impedance), density and derivative parameter
such as Vp/Vs ratio which more sensitive with lithology and fluids. Has been
conducted two flows in this paper, the first flow was using seismic data of PS
stack PS time which need to converse first by domain conversion process from
PS time domain to be PP time domain. This first flow produces poor results due
to the limitations of the domain conversion process. And for the second flow,
seismic PS stack PP time was use to solve the limitation of the result from the
first flow. The result of the inversion such as parameter of P impedance, S
impedance, density, and Vp/Vs ratio with correlation value 0.955339, 0.936588,
0.923806 and 0.781296 respectively. The distribution of sandstone and shale
lithology distinguished by crossploting the parameter of P impedance and S
impedance. Hydrocarbon-saturated sandstone reservoir distinguished by
crossploting the parameter of P impedance and Vp/Vs ratio. Thus, the
hydrocarbon-saturated sandstone reservoirs can be estimated lies between the
depth of marker on the wells beta1 and MF4 which around 1350 ms and 1400
ms.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Additional Information: | RSGf 552 Dez i |
| Uncontrolled Keywords: | Converted Wave, Rasio Vp/Vs, Konversi Domain, :itologi Reservoir |
| Subjects: | T Technology > TD Environmental technology. Sanitary engineering > TD395 Reservoirs (water supply) |
| Divisions: | Faculty of Civil Engineering and Planning > Geophysics Engineering > 33201-(S1) Undergraduate Thesis |
| Depositing User: | EKO BUDI RAHARJO |
| Date Deposited: | 21 Oct 2019 08:14 |
| Last Modified: | 21 Oct 2019 08:14 |
| URI: | http://repository.its.ac.id/id/eprint/71304 |
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