Prediksi Persebaran Reservoir Batupasir Menggunakan Metode Inversi Impedansi Akustik dan Seismik Atribut Pada Lapangan "N" Cekungan Sumatera Selatan

Masrura, Nikita Lailul (2025) Prediksi Persebaran Reservoir Batupasir Menggunakan Metode Inversi Impedansi Akustik dan Seismik Atribut Pada Lapangan "N" Cekungan Sumatera Selatan. Other thesis, Institut Teknologi Sepuluh Nopember.

Text 5017211056-Undergraduate_Thesis.pdf - Accepted Version Restricted to Repository staff only Download (6MB) | Request a copy

Abstract

Identifikasi yang akurat terhadap distribusi reservoir sangat penting untuk menentukan zona prospektif dan produktif. Salah satu pendekatan yang digunakan untuk memetakan distribusi reservoir di Lapangan "N" adalah metode inversi seismik dan seismik atribut. Penelitian dilakukan dengan tujuan untuk menganalisis properti reservoir yang sensitif dengan impedansi akustik serta mengetahui metode inversi impedansi akustik terbaik, yang selanjutnya digunakan dalam pengidentifikasian persebaran properti reservoir dengan metode seismik atribut pada lapangan "N". Pada penelitian ini, digunakan 2 data sumur dan data seismik 3D Post Stack Time Migration. Analisis awal dilakukan dengan menganalisis properti reservoir yang sensitif dengan impedansi akustik dan didapatkan properti yakni gamma ray, densitas, NPHI, dan sonic. Lalu dilakukan hasil perbandingan inversi impedansi akustik model based dan seismik atribut. Hasil inversi impedansi akustik model based didapatkan rata-rata nilai korelasi 0.96 dan rata-rata error 0.24. Pada penampang model based didapatkan hasil inversi impedansi akustik (AI) dengan rentang nilai AI sebesar 7272.15-7536.60 ((m/s)*(g/cc)). Zona di sekitar sumur NKT-1 terindikasi sebagai batupasir berpori berpotensi mengandung hidrokarbon, sedangkan zona di sekitar sumur NKT-2 cenderung kurang prospektif karena memiliki nilai AI yang lebih tinggi. Analisis selanjutnya dilakukan pada parameter fisis dengan metode seismik atribut rms amplitude dan sweetness. Didapatkan zona sebaran reservoir pada atribut rms amplitude dan sweetness berada pada amplitudo tinggi (high rms dan high sweetness) ditandai dengan adanya bright spots pada kedua peta tersebut. Atribut rms amplitude berada pada rentang nilai 4500-12500 pada top 3 sand dan 3500-11400 top L1. Atribut sweetness berada pada rentang nilai 1300-3300 pada top 3 sand dan 1000-2600 pada top L1. ======================================================================================================================================
Accurate identification of reservoir distribution is crucial for determining prospective and productive zones. One approach used to map reservoir distribution in the “N” Field is the seismic inversion and seismic attribute method. The study was conducted with the aim of analyzing reservoir properties sensitive to acoustic impedance and determining the best acoustic impedance inversion method, which was then used to identify reservoir property distribution using the seismic attribute method in the “N” Field. In this study, 2 well data and 3D Post Stack Time Migration seismic data were used. Initial analysis was carried out by analyzing reservoir properties sensitive to acoustic impedance and obtained properties, namely gamma ray, density, NPHI, and sonic. Then, the results of model-based acoustic impedance inversion and seismic attributes were compared. The results of model-based acoustic impedance inversion obtained an average correlation value of 0.96 and an average error of 0.24. In the model-based crosssection, the results of acoustic impedance (AI) inversion were obtained with an AI value range of 7272.15–7536.60 ((m/s)*(g/cc)). The zone around the NKT-1 well is indicated as porous sandstone that has the potential to contain hydrocarbons, while the zone around the NKT-2 well tends to be less prospective because it has a higher AI value. Further analysis was carried out on physical parameters using the seismic method of rms Amplitude and Sweetness attributes. It was found that the reservoir distribution zone in the rms amplitude and sweetness attributes was at high amplitude (high rms and high sweetness) indicated by the presence of bright spots on both maps. The rms amplitude attribute was in the range of 4500-12500 at top 3 sand and 3500-11400 top L1. The sweetness attribute was in the range of 1300-3300 at top 3 sand and 1000-2600 at top L1.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Atribut Seismik, RMS Amplitude, Seismik Inversi, Impedansi Akustik, Seismic Attributes, RMS Amplitude, Seismic Inversion, Acoustic Impedance
Subjects:	Q Science Q Science > QE Geology > QE539.2 Seismic traveltime inversion 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:	Nikita Lailul Masrura
Date Deposited:	25 Jul 2025 07:45
Last Modified:	25 Jul 2025 07:45
URI:	http://repository.its.ac.id/id/eprint/121566

Actions (login required)

View Item