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ANALISIS FASIES DAN PEMODELAN LINGKUNGAN PENGENDAPAN FASE TEKTONIK SYN-RIFT, FORMASI TALANGAKAR DI NORTH SERIBU TROUGH

FACIES ANALYSIS AND DEPOSITIONAL MODEL IN SYN-RIFT TECTONIC PHASE, TALANGAKAR FORMATION IN NORTH SERIBU TROUGH

Master Theses from JBPTITBPP / 2018-07-12 15:34:02
Oleh : DENI WAHYUADI (NIM : 22015024), S2 - Geological Engineering-FITB
Dibuat : 2017, dengan 11 file

Keyword : North Seribu Trough, Formasi Talangakar, lacustrine, syn-rift.

North Seribu Trough merupakan salah satu Sub-cekungan di Jawa Barat Utara yang menjadi daerah penghasil minyak bumi pada interval Formasi Talangakar yang telah mencapai faktor pengurasan maksimal. Interval reservoir Formasi Talangakar berumur Oligosen Akhir merupakan zona produksi utama, sedangkan interval Formasi Talangakar berumur Oligosen Awal masih dalam tahap evaluasi eksplorasi.

Studi ini bertujuan untuk menggali wawasan baru mengenai Formasi Talangakar berumur Oligosen Awal dengan menggunakan analisis terintegrasi. Beberapa analisis data sumuran telah dilakukan berupa analisis litofasies, asosiasi fasies dan korelasi stratigrafi. Sedangkan analisis data seismik telah dilakukan mencakup interpretasi struktur dengan hasil peta struktur kedalaman, peta ketebalan (isopach), analisis fasies seismik berupa pola konfigurasi internal seismik dan analisis atribut seismik.

Analisis terintegrasi hasil dari data sumuran dan seismik digunakan sebagai masukan untuk membuat model lingkungan pengendapan. Konsep eksplorasi pada Formasi Talangakar berumur Oligosen Awal bertumpu pada model lingkungan pengendapan untuk menentukan potensi dan distribusi reservoir yang diperkirakan mengandung hidrokarbon.

Berdasarkan analisis tersebut, Formasi Talangakar berumur Oligosen Awal pada Sub-cekungan North Seribu Trough merupakan evolusi endapan danau (lacustrine) dengan sumber sedimen berasal dari endapan delta danau dan endapan garis batas danau dari Seribu Platform ke arah pusat cekungan dasar danau. Selain itu terdapat endapan kipas alluvial (alluvial fan) pada border fault yang masuk ke dasar danau. Potensi reservoir diperkirakan berupa endapan batupasir dari ketiga sub-lingkungan pengendapan yang terdapat pada Sub-cekungan North Seribu Trough.

Deskripsi Alternatif :

North Seribu Trough is one of Northwest Java Sub-basin in which has been an oil producer area in Talangakar Formation interval which has reached maximum recovery factor. Reservoirs in Late Oligocene Talangakar Formation interval were primary production zone, whereas Early Oligocene Talangakar Formation interval are still in exploration evaluation process.

This study is intended to define new insight about Talangakar Formation in Early Oligocene using integrated analysis. Several well data analysis have been done such as lithofacies analysis, facies association and stratigraphic correlation. Whereas seismic data analysis has been done including structural interpretation with the results are depth structure map, isopach map, seismic facies analysis such as internal seismic pattern configuration and seismic attribute analysis.

Integrated analysis resulted from well and seismic data are being used as input to define depositional model. Exploration concept in Talangakar Formation interval of Early Oligocene are based on depositional model to determine reservoirs potential and distribution which contained hydrocarbon.

Based on those several analysis, Early Oligocene Talangakar Formation in North Seribu Trough Sub-basin determined as evolution of lacustrine deposits with the source of the sediments came from lake delta deposit and lake shoreline deposit from Seribu Platform to depocenter of the lake. Beside that, there is alluvial fan deposit in border fault which deposited in the center of the lake. Reservoir potential approximately are sandstone deposits from those three depositional environment which occured in North Seribu Trough Sub-basin.


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ID PublisherJBPTITBPP
OrganisasiS2 - Geological Engineering-FITB
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KotaBandung
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  • Pembimbing : Dr. Dwiharso Nugroho, M.T. dan Dr. Alfend Rudyawan, S,T, M.T., Editor: PKL-SMK

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