Wigantiyoko, Gigih Prakoso (2016) Analisis Litologi Reservoir Menggunakan Vp/Vs Hasil Inversi Secara Terpisah (Independent Inversion) Gelombang Pp Dan Ps. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Pada kondisi bawah permukaan yang sangat kompleks, seismik yang hanya
memanfaatkan gelombang P (PP wave) kurang mampu menggambarkan
litologi khususnya pada daerah yang tersaturasi fluida seperti gas chimney.
Gelombang PS (converted wave) yang didapatkan dari konversi pantulan
gelombang P digunakan untuk mengatasi permasalahan tersebut, dikarenakan
sifat dari gelombang S yang tidak dapat merambat pada medium fluida.
Sehingga untuk menganalisis litologi yang kompleks, dilakukan proses inversi
dengan menggunakan gelombang PP dan PS. Proses inversi tersebut dilakukan
secara terpisah (independent inversion). Hasil akhir dari proses inversi seismik
PP dan PS adalah berupa penampang perbandingan nilai Vp/Vs yang
didapatkan dari penampang impedansi akustik (Zp) dan impedansi shear (Zs).
Dengan melakukan analisis Vp/Vs hasil independent inversion, didapatkan
bahwa litologi reservoir pada daerah GG2-GG6 adalah berupa sand dengan
nilai Vp/Vs < 2.1, Zp < 5000 m/s*kg/m3, dan porositas sebesar 27-29%.
Didapatkan akumulasi fluida reservoir (zona gas) terbesar pada window 3
(GG5-GG6) dengan lokasi CDP 126504358-126504708 dengan kedalaman
vi
dalam domain waktu 1850-1950 ms disebelah Barat sumur, dan pada CDP
126504708-126504813 dengan kedalaman dalam domain waktu 1700-1800 ms
di sebelah Timur sumur.
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Describing subsurface conditions which are very complex, seismic waves P
(seismic PP) are less able to describe the subsurface conditions, especially in
areas such as saturated fluid (chimney gas). Seismic PS (converted wave)
obtained from the conversion of the P wave reflections are used to solve the
problem, due to the characteristic of the S wave that could not propagate in a
fluid medium. So as to analyze the subsurface lithology in more detail, by using
inversion process that utilizes two types of seismic waves above. Inversion
process is done separately (independent inversion) between seismic PP and PS
to get the value of Vp/Vs ratio to analyze and determine the reservoir
lithology. The result of the seismic inversion PP and PS separately
(independent inversion) is in the form of a comparison of Vp/Vs ratio which
obtained from acoustic impedance (Zp) and shear impedance (Zs) cross
section. By analyzing the Vp/Vs, the reservoir lithology on GG2-GG6 area is in
the form of sand with a value of Vp/Vs <2.1, Zp <5000 m/s* kg/m3, and a
porosity of 27-29%. The largest hydrocarbon accumulation (gas) found on
window 3 (GG5-GG6) with CDP location 126504358-126504708 with depth in
the time domain 1850-1950 ms located in the west of the well, and on the CDP
viii
126504708-126504813 with depth in the time domain 1700-1800 ms in the east
of the well.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Additional Information: | RSGf 552 Wig a |
| Uncontrolled Keywords: | Converted Wave, Independent Inversion, Litologi, Vp/Vs |
| Subjects: | T Technology > TC Hydraulic engineering. Ocean engineering T Technology > TC Hydraulic engineering. Ocean engineering > TC167 Dams, reservoirs |
| Divisions: | Faculty of Civil Engineering and Planning > Geophysics Engineering > 33201-(S1) Undergraduate Thesis |
| Depositing User: | EKO BUDI RAHARJO |
| Date Deposited: | 08 Oct 2019 03:34 |
| Last Modified: | 08 Oct 2019 03:34 |
| URI: | http://repository.its.ac.id/id/eprint/71042 |
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