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All Journal IJOG : Indonesian Journal on Geoscience JLBG (Jurnal Lingkungan dan Bencana Geologi) (Journal of Environment and Geological Hazards) Bulletin of Geology Jurnal Geosains Terapan
Dwiharso Nugroho, Dwiharso
Program Studi Teknik Geologi, Fakultas Ilmu Dan Teknologi Kebumian, Institut Teknologi Bandung (ITB)
Earth & Planetary Sciences Energy Engineering Environmental Science

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Fasies sedimen Kuarter berpotensi likuifaksi Pesisir Kota Padang, Provinsi Sumatra Barat berdasarkan data inti bor dan CPTu Prahara Iqbal; Adrin Tohari; Imam A. Sadisun; Dwiharso Nugroho
Jurnal Lingkungan dan Bencana Geologi Vol 5, No 1 (2014)
Publisher : Badan Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (5817.602 KB) | DOI: 10.34126/jlbg.v5i1.61

Abstract

ABSTRAKKajian fasies dan sifat fisik sedimen Kuarter kaitannya dengan potensi likuifaksi di daerah Pesisir Kota Padang dan sekitarnya dilakukan dengan tujuan mendapatkan hubungan antara fasies dan karakteristik fisik sedimen Kuarter terhadap potensi likuifaksinya. Metode yang digunakan adalah observasi inti bor dan pola kurva CPTu untuk menentukan fasies yang berkembang, analisis laboratorium, dan analisis potensi likuifaksi untuk mengetahui karakteristik fisik setiap fasies. Berdasarkan asosiasi litologi, pengamatan pola kurva CPTu, analisis laboratorium, dan analisis potensi likuifaksi, terdapat tiga fasies yang berkembang di daerah penelitian dengan potensi likuifaksi yang berbeda. Fasies pasir fluvial memiliki potensi likuifaksi yang lebih tinggi daripada fasies pasir pematang pantai dan fasies lempung rawa, sedangkan fasies lempung rawa memiliki potensi likuifaksi yang paling rendah di antara fasies-fasies tersebut.Kata Kunci: Fasies sedimen Kuarter, CPTu, Likuifaksi, Kota PadangABSTRACTThe study of Facies and physical property of Quaternary sediments and its relationship with liquefaction potential was conducted at the coastal area of Padang city, West Sumatra Province in order to get the relationship between facies and physical characteristics of the Quaternary sediments and its liquefaction potential. The method used are core and CPTu patterns observations to determine the developed facies, laboratory analysis, and liquefaction potential analysis to determine the physical characteristics of each facies. Based on lithological associations, CPTu pattern observations, laboratory analysis, and liquefaction potential analysis, there are three facies that develop at the research areas with different liquefaction potential. Fluvial sand facies has greater liquefaction potential than the beach ridge sand facies and marsh clay facies, while marsh clay facies has the smallest one among two facies.Keyword: Facies and Quarternary sediments Kuarter, CPTu, liquefaction, city of Padang
Pore Pressure and Compartmentalization of Carbonate Reservoirs in Northern Madura Platform - East Java Basin, Indonesia Ecep Suryana; Lambok M. Hutasoit; Agus M. Ramdhan; Dwiharso Nugroho; Arifin Arifin
Indonesian Journal on Geoscience Vol. 10 No. 3 (2023)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.10.3.297-307

Abstract

Understanding pore pressure characteristics in carbonate reservoirs is essential, because it concerns all aspects of subsurface, drilling, and occupational safety, as well as the environment in oil and gas exploration and exploitation. In this study, the pore pressure regime and connectivity of the carbonate reservoir (compartmentalization) of Kujung and Ngimbang Formations in the northern Madura Platform of East Java Basin are characterized by utilizing direct pressure data and wireline logs from five wells. The result shows that both hydrostatic and slight overpressure conditions are found in these formations, further indicating the presence of carbonate compartmentalization. The magnitudes of overpressure, however, are mostly very low, with an average of ~37 psi. Four compartmentalized carbonates are identified based on the presence of different pressure gradients in the water leg. The slight overpressure in the carbonates is likely owing to pressure transference from overpressured shale at depth. In addition, by using acoustic impedance from seismic, the depositional environments of the carbonates are interpreted as lagoon and tidal flat. These environments support the occurrence of patch reef carbonate buildups in the Kujung and Ngimbang Formations, which later become a good environment for overpressure generation and carbonate reservoir compartmentalization. Keywords: carbonates, compartmentalization, depositional environment, slight overpressure
STUDI TIPE BATUAN DAN PEMODELANNYA DI BLOK X, CEKUNGAN BARITO Zurisman Fitriadi; Dwiharso Nugroho; Nurcahyo Indro Basuki
Bulletin of Geology Vol 1 No 1 (2017): Bulletin of Geology
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/bull.geol.2017.1.1.5

Abstract

Field X is an oilfield in Barito Basin, South Kalimantan, which produces hydrocarbon from reservoir within Lower Tanjung Formation. The oil discovery in this field was initiated in 1930 by BPM and until now Tanjung field is still productive and field development is ongoing. Layer D is in Lower Tanjung Formation and is believed as meandering channel depositional setting. Core and thin section data from Layer D could be found from well X-109, X-104, and X-105. Analysis which has been conducted finding 9 lithofacies’, including (1) siltstone-claystone (F), (2) rooted siltstone (Fr), (3) very fine sandstone (Svf), (4) fine sandstone (Sf), (5) bioturbated and rooted fine sandstone (Sfbr), (6) weakly cemented fine sandstone (Sfwc), (7) weakly cemented medium sandstone (Smwc), (8) moderately cemented medium sandstone (Smmc), and (9) coarse sandstone (Sc). These lithofacies’ are grouped into four architectural facies’ (1) channel sand, (2) point bar, (3) crevasse splay, dan (4) overbank. Rock type determination used flow zone indicator (FZI) method found 3 rock types (RT). RT 1 is associated to channel sand, RT 2 is associated to channel body, point bar, and overbank, and RT 3 is associated to channel sand, point bar, crevasse splay, and overbank. Reservoir properties modelling which is controlled by facies and rock type models showed relation in petrophysical behaviour to its rock type. High porosity values are associated to channel sand. High permeability values are associated to rock type RT 1 and RT 2.
PENDEKATAN TERINTEGRASI DALAM PEMODELAN FASIES RESERVOIR D-10 STRUKTUR NKL, LAPANGAN SANGASANGA, CEKUNGAN KUTAI, INDONESIA Rizal, Ferdi; Nugroho, Dwiharso; Sumintadireja, Prihadi
Bulletin of Geology Vol 7 No 3 (2023): Bulletin of Geology
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/bull.geol.2023.7.3.2

Abstract

Total kumulatif produksi minyak saat ini di Struktur North Kutai Lama (NKL) sekitar 70% berasal dari reservoir D-10 yang terletak di sayap (flank) antiklin timur dari ujung utara Antiklinorium Samarinda. Namun demikian, pengembangan reservoir inimempunyai kendala dalam pemodelan fasies karena kurangnya data sumur yang menembus area flank dan reservoir D-10 tidak menerus hingga ke bagian punggungan (crestal) dari Antiklinorium Samarinda. Ketidak menerusan ini terlihat dari posisireservoir minyak pada area flank berada di bawah kontak minyak-air dari reservoir di daerah crestal dan tren evolusi tekanan terlihatberbeda antara bagian crestal dan flank. Salah satu tahapan penting dalam pemodelan fasies adalah analisis paleo-depositional environment yang tentunya berkaitan dengan penentuan fasies reservoir. Penelitian ini melakukan pendekatan terintegrasi dengan memanfaatkan dan mensintesiskan lima data, yaitu analisis biostratigrafi, elektro-fasies, besar butir, struktur sedimen dan paleocurrent sertasa linitas reservoir. Korelasi antar sumur dilakukan dengan menggunakan konsep cyclothem, karena terdapat perulangan lapisan Batubara yang membatasi lapisan batupasir baik secara lateral maupun vertikal. Tahapan berikutnya adalah interpretasi tren fasies dari peta Net to Gross (NTG) yang dikontrol oleh anomali atribut seismik, penentuan? Nilai NTG tiap sumur, perbedaan kontak fluida, analisis evolusi tren tekanan dan rasio lebar sungaiterhadap netsand. Pendekatan terintegrasi terbukti dapat menjawab permasalahan pada distribusi fasies dankonektivitas reservoir D-10. Tentunya peta NTG digunakan sebagai tren pada saat pemodelan fasies secara 3D, sehingga perhitungan volume hidrokarbon menjadi lebih realistis. Kata kunci: Analisis terintegrasi, lingkungan pengendapan purba, pemodelan fasies, atribut seismik, cyclothem
RESERVOIR CHARACTERIZATION AND COMPARTMENT IN POSTRIFT DEPOSITED, UPPER TALANGAKAR FORMATION, BELUT FIELD, SOUTH SUMATRA BASIN Pramudito, Dimas; Nugroho, Dwiharso; Abdurrachman, Mirzam
Bulletin of Geology Vol 5 No 2 (2021): Bulletin of Geology
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/bull.geol.2021.5.2.6

Abstract

Lapangan Belutmerupakan salah satu asetPertamina EP yang telah berproduksi lebih dari 50 tahun. Lapangan ini terletaksekitar 120 km di sebelahbarat dari Kota Palembang, Sumatera Selatan. Reservoir utama merupakan batupasir dan batugamping yang diendapkan pada awal Miocene dan termasuk ke dalam kelompok bagian atas Talangakar atau Transgresive Member (TRM). Penemuan hidrokarbondi area yang lebih down flank (utara) berawal dari pemboran step out di area penelitian. Berdasarkan pemboran tersebut diperoleh minyak dari reservoir batupasir dengan tekanan lebih besar dibandingkan di area eksisting. Saat ini Lapangan Belutsudah dalam tahap pengembangan, sehingga dibutuhkan model reservoir yang lebih komprehensif untuk strategi pengembangan lebih lanjut.Data yang digunakan dalam penelitianini adalah data batuan inti dari tigasumur, data rekaman talikawat dari 47 sumur, analisis fosil, borehole image, dan data seismik tiga dimensi (3D Karbela) serta data tekanan reservoir. Tahapan pertama penelitian adalah menentukanlitofasies dan asosiasi fasies dari data batuan inti dan biostratigrafi. Selanjutnya menentukan marker parasikuen dan sikuen dari pola electrofacies tiap sumur. Korelasi stratigrafisikuendilakukan untuk menentukan pola penyebaran fasies pengendapan. Karakterisasi reservoir secara tiga dimensi dilakukan melalui pemodelan fasies, volume serpih, porositas, permeabilitas, rock type, dansaturasi. Berdasarkan korelasi stratigrafisikuendan seismik stratigrafi, penyebaran fasies secara lateralmenunjukkan arah basinwardkesebelah selatan. Dalam penelitian ini semakin ke area selatan akan didominasi oleh endapan distal atau marine sebaliknya semakin ke utara maka akan ditemukan endapan terrestrial yang bersifat lebih sand prone. Adanya kenaikan muka air laut selama pengisian cekungan (retrogradational) menyebabkan perubahan fasies secara vertikal yaitu mulai dari sistem pengendapan channel, delta, hingga shallow marine.Data tekanan menunjukkan bagian utara (setelah di datumkan) memiliki tekanan sebesar 0.85 –0.99 (SG ekuivalen) sedangkan di area existing mempunyai tekanan 0.67 –0.78 (SG ekuivalen). Perbedaan tekanan disebabkan karena perbedaanasosiasi fasiespada sikuen yang sama antara area utara dengan area selatan. Berdasarkan analisis tekanan formasidan adanya penemuan potensi hidrokarbon di area down flank menunjukkan terdapat kompartemen antara area utara dan selatan (stratigraphic trap). Kata kunci: Formasi Talang Akar, down flank, pemodelan facies, kompartemen
INSIGHT ON IDENTIFYING LOW RESISTIVITY PAY ZONES FOR SANDSTONE INTERVALSIN SOUTH SUMATRA AND SANGA SANGA BLOCK, INDONESIA. Nugroho, Dwiharso
Bulletin of Geology Vol 7 No 1 (2023): Bulletin of Geology
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/bull.geol.2023.7.1.3

Abstract

Low resistivity pay zones (LRPZ) are not the primary targets in most development fields. The challenge is to identify it and define its reservoir petrophysical properties besides the classic analysis of the genetics of the LRPZ. It is important to note that most LRPZ is caused by reasons directly linked to the petrophysical parameters as main constraints on defining the reservoir (petrophysical) properties. It has consequences that the petrophysical parameters for LRPZ should be defined separately from picking the parameters for normal high resistivity on the other part of the wells. This paper proposed simple methods to predict the LRPZ using the primary well logs data. It also shares some decisions made in South Sumatra, and Sanga Sanga Block results in a pretty successful story relatedly. The first method is a simple petrophysical analysis using primary wireline log data which is done by applying a particular cutoff that has been exercised on some wells in the basin-wise well test data to get field references in the same basin/subbasin (in this case is South Sumatra Basin). The second method is identifying and analyzing LRPZ using well-known MRGC (Multi-Resolution Graph-Based Clustering), commonly used on electro facies and rock type analysis and has never been used to define LRPZ. This study proved that these two methods performed well as LR pay zone prediction and significantly added new pay zones to increase the chance of getting additional reserves and production. Keywords: Low Resistivity Pay Zone, petrophysics analysis, Multi-Resolution Graph-Based Clustering (MRGC), South Sumatra Basin, Sanga Sanga Block
Diagenetic Controls on Carbonate Reservoir Quality of Kujung I Formation in KE-2 Field, East Java Basin, East Java. Rezky Aditiyo; Dwiharso Nugroho; Nurcahyo Indro Basuk; Riza Agustiana; Anom Prasetya
Jurnal Geosains Terapan Vol 5 No 1 (2022): Jurnal Geosains Terapan
Publisher : Lembaga Ilmu Pengetahuan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Early Miocene Kujung I Formation in KE-2 Field is a shelf edge barrier reef on North Madura Platform, East Java Basin. It was subsequently modified in near surface and burial diagenetic environments. Study has been made to establish the paragenetic sequence and effect of diagenesis on reservoir quality. Rock type identification was conducted using Rock Quality Index (RQI) and Flow Zone Indicator (FZI) methods from routine core analysis data. Subsequently, thin section, SEM, and XRD analysis were carried out to find out the link between geological attributes and petrophysical properties. Five major facies were identified: skeletal packstone, larger foraminifera wackestone, larger foraminifera packstone, coral packstone, shale, rhodolithic packstone, rhodolithic grainstone, and larger foraminifera grainstone. Diagenetic process which formed pore type and pore size is likely geological attributes controlling rock type association. Fibrous and botryoidal cement formed during shallow marine diagenesis. Subsequent exposure to a meteoric diagenetic environment resulting in leaching of high Mg calcite and aragonite, created separate vugs, moldic porosity. Burial diagenesis has resulted in compaction and stylolitization. Post burial diagenesis may result touching-vugs porosity and permeability, primarily in grain-dominated facies. Studied interval then can be classified into 5 rock type (RT), those are RT A – touching vugs porosity, RT B – touching vugs dan separate vugs, RT C – interparticle and separate vugs, RT D – separate vugs porosity, RT E – interparticle and separate vugs porosity. The rock type could define the reservoir quality, thus important to further exploration and development planning in KE-2 Field.
Co-Authors Abdurrachman, Mirzam Adrin Tohari Agus M. Ramdhan Anom Prasetya Arifin Arifin Dimas Pramudito Ecep Suryana Imam A. Sadisun Lambok M. Hutasoit Nurcahyo Indro Basuk Nurcahyo Indro Basuki Prahara Iqbal Prihadi Sumintadireja, Prihadi Rezky Aditiyo Riza Agustiana Rizal, Ferdi Zurisman Fitriadi