ANALISIS PETROFISIKA, ATRIBUT SEISMIK DAN PEMODELAN RESERVOAR 3 DIMENSI UNTUK PERHITUNGAN CADANGAN DAN PROSPEK PENGEMBANGAN LAPANGAN DNF SUMATRA SELATAN

Fitriana Aprilia, 0815051015 (2015) ANALISIS PETROFISIKA, ATRIBUT SEISMIK DAN PEMODELAN RESERVOAR 3 DIMENSI UNTUK PERHITUNGAN CADANGAN DAN PROSPEK PENGEMBANGAN LAPANGAN DNF SUMATRA SELATAN. Fakultas Teknik, Universitas Lampung.

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Abstrak

Struktur reservoar Lapangan DNF merupakan batuan karbonat berumur Miosen. Dalam rancangan pengembangan lapangan ini membutuhkan keakuratan model geologi. Kombinasi dari resolusi tinggi dari data seismik 3D dengan data sumur yang telah ada dibutuhkan dalam membangun geological framework sebagai dasar input 3D reservoir modeling. Lingkungan pengendapan facies dapat menjadi kunci dalam mengontrol heterogenitas porositas dan permeabilitas. Konsep sekuen stratigrafi dan seismik atribut digunakan dalam memprediksi distribusi reservoir secara vertikal dan lateral. Data core dan sumur di reservoar menunjukkan dua tipe facies sedimen, yaitu facies packstone dan facies wackstone. Dengan lingkungan pengendapan tipe patch reef. Facies packstone menunjukkan properti reservoar terbaik, yang mana terdeposit pada lingkungan prograding clastic carbonate. Litologi unit atas (unit 4 ke 6) memiliki distribusi porositas dan permeabilitas yang bervariasi. Sedangkan pada unit litologi bagian bawah (unit 1 – unit 3) merupakan non reservoir rock yang berupa batuan karbonat dengan porositas ketat. Saturasi air ditentukan dari porositas karbonat melalui rumus Archie. Nilai rentang porositas sebesar 0.01 – 0.3 fraksi. Untuk permeabilitas sebesar 0.1 – 50 mD. Integrasi antara analisis petrofisika, pengkondisian terhadap facies model dan 3D envelope impedansi akusitik dilakukan untuk memprediksi persebaran distribusi 3D model porositas. Nantinya 3D statik reservoar model dijangkau melalui integrasi struktur dan kerangka geologi dengan hasil evaluasi petrofisika. Model realistik esensinya untuk rancangan pengembangan dan meningkatkan tingkat keyakinan mengestimasi original oil in place. Kata kunci: 3D pemodelan reservoar, facies, analisis petrofisika, seismik atribut, estimasi original oil in place, dan prospek pengembangan. Reservoir rock of the DNF Field comprises Miocene Limestone. Development plan of DNF field requires an accurate geological model. Combination of high resolution 3D seismic data with existing wells data were obtained for building geological framework as a basic input of 3D reservoir modeling. Depositional facies can be a key factor controlling heterogeneity in porosity and permeability. Sequence stratigraphic concept and seismic attribute generation were utilized in order to predict vertical and lateral reservoir distribution. Cores and well logs in the reservoir show two sedimentary facies packstone and wackestone, was deposited in patch reef-type depositional environment. The packstone facies shows the best reservoir properties, which were deposited in prograding clastic carbonate. The lithology of the upper unit (units 4 to 6) is a rock reservoir with the distribution of porosity and permeability rates varying, where the bottom of the lithological units (units 1 to 3) are in the form of carbonate rock with very tight porosity. The water saturation was determined from the porosity of the reservoirs through the Archie equation. The type of porosity ranged from 0.01– 0.3 fraction and the values of permeability were within the range 0.1 – 50 mD. Integrated between petrophysical analysis, conditioned to facies model and 3D envelope acoustic impedance were executed to predict 3D model porosity distribution. Eventually 3D static reservoir model was achieved through integration of structural and geological framework with petrophysical evaluations result. This realistic reservoir model is essential for future development and improves the confidence levels of original oil in place estimation. Keywords: 3D reservoir modeling, facies, petrophysical analysis, attributes seismic, original oil in place estimation, and future development.

Tipe Karya Ilmiah: Skripsi
Subyek: A General Works = Karya Karya Umum
Teknologi > Teknologi (General)
Teknologi > Teknologi (General)
Teknologi (General)
Program Studi: Fakultas Teknik > Prodi Geofisika
Depositing User: 8511590 . Digilib
Date Deposited: 30 Apr 2015 09:24
Last Modified: 30 Apr 2015 09:24
URI: http://digilib.unila.ac.id/id/eprint/9579

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