Analisis Litologi Reservoir Menggunakan Vp/Vs Hasil Inversi Secara Terpisah (Independent Inversion) Gelombang Pp Dan Ps

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. ================================================================= 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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