Analisis Data Sesimik Pre-Stack Menggunakan Inversi Simultan dan Transformasi LR (Lambda-Rho) Untuk Karakterisasi Reservoir

Gaol, Daniel Juliandro Lumban (2024) Analisis Data Sesimik Pre-Stack Menggunakan Inversi Simultan dan Transformasi LR (Lambda-Rho) Untuk Karakterisasi Reservoir. Other thesis, Institiut Teknologi Sepuluh Nopember.

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Abstract

Karakterisasi porositas dan saturasi air dari reservoir merupakan langkah krusial untuk pengembangan lapangan, perencanaan ,perancangan skenario pengelolaan reservoir. Cekungan Jawa Timur merupakan salah satu dari beberapa cekungan yang sudah berproduksi. Cekungan ini juga memiliki beberapa formasi yang telah membentuknya, salah satunya adalah Formasi Kujung yang terbentuk akibat naiknya muka air laut dan penyusutan dari kondisi karang. Objektif penelitian berada pada struktur build-up pada formasi kujung. Inversi simultan seismik pre-stack untuk mendapatkan Zp, Zs, dan densitas yang reliable dalam prediksi fluida dan properti lainnya. Transformasi lambda-rho sebagai turunan dari Zp, Zs, dan densitas memberikan informasi tambahan tentang facies dan jenis fluida karena keduanya sangat peka terhadap prediksi dan kategorisasi fluida. Dari hasil inversi simultan (P-impedance) dan lambda-rho pada daerah penelitian, persebaran P-impedance pada objektif penelitian berada pada rentang nilai 22.103 – 38.103 g.ft/cm3.s dengan nilai porositas 2-30 %. Persebaran nilai lambda-rho pada objek penelitian berada pada 20.108 - 80.108 kg2/s2m4 dengan karakteristik nilai saturasi air berkisar 20-100%. Hasil tersebut mampu menunjukkan daerah dengan porositas baik diatas 15% dengan nilai cut off impedansi akustik <32.10^3 g.ft/〖cm〗^3.s dan sensitif terhadap daerah yang dengan indikasi hidrocarbon dengan cut off lambda-rho < 2.6.10^8 kg2/s2m4. Daerah dengan persebaran porositas baik dan rendah sw berada di daerah utara struktur build-up daerah sekitar sumur DUL-2 dengan range nilai 22.103 – 28.103 g.ft/〖cm〗^3.s. dengan nilai lambda-rho 10.108 - 26.108 kg2/s2m4. Pada daerah utara daerah penelitian juga terdapat area dengan porositas tinggi dengan nilai 24.103 – 28.103 g.ft/〖cm〗^3.s dengan nilai lambda-rho 20.108 - 26.108 kg2/s2m4.
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Characterizing the porosity and water saturation of a reservoir is a crucial step for field development, planning, and designing reservoir management scenarios. The East Java Basin is one of several basins that are already producing. This basin also has several formations that have shaped it, one of which is the Kujung Formation, formed due to rising sea levels and the reduction of coral conditions. The research objective is focused on the build-up structure of the Kujung Formation. Simultaneous inversion of pre-stack seismic data is conducted to obtain reliable Zp, Zs, and density for fluid prediction and other properties. The lambda-rho transformation, derived from Zp, Zs, and density, provides additional information about facies and fluid types as both are very sensitive to fluid prediction and categorization. From the results of the simultaneous inversion (P-impedance) and lambda-rho in the study area, the distribution of P-impedance in the research objective ranges from 22.103- 38.103 g.ft/cm^3.s with porosity 2-30%. The distribution of lambda-rho values in the research object ranges from 20.108 - 80.108 kg2/s2.m4, with water saturation characteristics ranging from 20-100%. These results can indicate areas with good porosity (<15%), with a cut-off P-impedance value of <32.103 g.ft/cm3.s and sensitivity to areas with hydrocarbon indications with a lambda-rho cut-off of <2.6.108 kg2/s2.m4). Areas with good porosity and low sw distribution are located in the northern build-up structure around the DUL-2 well, with values ranging from 22.103-28.103 g.ft/cm3.s and lambda-rho values from 10.108-26.108 kg2/s2.m4. In the northern part of the study area, there are also regions with high porosity values ranging from 24.103-28.103 g.ft/cm3.s and lambda-rho values from 20.108-26.108 kg2/s2.m4.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Inversi simultan, Karakterisasi reservoir, Lambda-rho
Subjects:	Q Science > QE Geology > QE538.5 Seismic tomography; Seismic waves. Elastic waves Q Science > QE Geology > QE539.2.S4 Seismic models T Technology > TN Mining engineering. Metallurgy > TN269 Prospecting--Geophysical methods
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Geophysics Engineering > 33201-(S1) Undergraduate Thesis
Depositing User:	Daniel Juliandro Lumban Gaol
Date Deposited:	28 Aug 2024 05:18
Last Modified:	28 Aug 2024 05:18
URI:	http://repository.its.ac.id/id/eprint/114965

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