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All Journal JLBG (Jurnal Lingkungan dan Bencana Geologi) (Journal of Environment and Geological Hazards) Bulletin of Geology
Dwiharso Nugroho
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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
INSIGHT ON IDENTIFYING LOW RESISTIVITY PAY ZONES FOR SANDSTONE INTERVALSIN SOUTH SUMATRA AND SANGA SANGA BLOCK, INDONESIA. Dwiharso Nugroho
Bulletin of Geology Vol 7 No 1 (2023): Bulletin of Geology
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

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Abstrack - in most development fields low resistivity pay zones (LRPZ) are not the main targets. Challenge is on identifying it and define their reservoir petrophysical properties beside the classic analysis on genetic of the LRPZ. It is important to note that most LRPZ genetically are caused by reasons that are directly linked to the petrophysical parameters as main constraints on defining the reservoir (petrophysical) properties. It have consequences that the petrophysical parameters for LRPZ should be defined exclusively before running the well log analysis for the whole well. This paper focuse on proposing simple methods to predict the LRPZ using the basic well logs data also share some decisions that have been made in South Sumatra and Sanga Sanga Block result in a quite success story relatedly. The first method is simple petrophysical analysis using basic wireline log data which done by applying a certain cut off and exercising the cut off on some wells in the basin wise well test data to get field wise 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) that normally is used on electro facies and rock type analysis and has never been used on defining LRPZ. This study proved that these two methods performed well as LR pay zone prediction and significantly adding new pay zones for increasing chance to get additional reserves and production.
PENDEKATAN TERINTEGRASI DALAM PEMODELAN FASIES RESERVOIR D-10 STRUKTUR NKL, LAPANGAN SANGASANGA, CEKUNGAN KUTAI, INDONESIA Ferdi Rizal; Dwiharso Nugroho; Prihadi Sumintadireja
Bulletin of Geology Vol 7 No 3 (2023): Bulletin of Geology
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

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Abstract

70% dari total produksi minyak saat ini di Struktur NKL berasal dari reservoir D-10 yang terletak di sayap (flank) bagian timur, utara Antiklinorium Samarinda. Namun demikian, pengembangan reservoir ini mempunyai kendala dalam pemodelan fasies karena kurangnya sumur yang menembus di area flank dan tidak berkorelasi dengan reservoir D-10 bagian punggungan (crestal). Adanya kompartemen ini, terlihat dari posisi reservoir minyak flank berada dibawah kontak minyak-air dari reservoir di crestal dan tren evolusi tekanan terlihat berbeda antara crestal dan flank. Hal utama dan menjadi tahap awal pemodelan fasies yaitu analisis lingkungan pengendapan. Penelitian ini melakukan pendekatan terbaru yaitu memanfaatkan dan mensintesiskan lima data yaitu analisis biostratigrafi dari beberapa jenis fosil, litofasies dari log tali kawat, besar butir batupasir dari data cutting, struktur sedimen dan paleocurrent dari data dipmeter serta salinitas reservoir. Hasil sintesis ini dijadikan dasar pembuatan model fasies untuk dikorelasikan ke sumur sekitar dengan menggunakan konsep cyclothem. Setelah itu, pembuatan tren fasies dari peta Net to Gross yang dikontrol oleh anomali atribut seismik dan rasio lebar channel terhadap netsand. Dengan pendekatan baru yang lebih komprehensif ini, terbukti dapat menjawab permasalahan pada distribusi fasies reservoir D-10 dan tentunya menjadi input dalam pemodelan reservoir 3D dan perhitungan volume hidrokarbon yang lebih realistis.
Co-Authors Adrin Tohari Ferdi Rizal Imam A. Sadisun Prahara Iqbal Prihadi Sumintadireja