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Ordas Dewanto
Jurusan T. Geofisika Fakultas Teknik Universitas Lampung
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Pengaruh Material Clay (Kaolinite/Illite) Terhadap Maturasi dan Potensi Material Organik Untuk Dasar Pengolahan Material Ser pih Sebagai Energi Alternatif Pengganti BBM Dewanto, Ordas; Soegijono, Bambang; Suharso, Suharso
Jurnal Spektra Vol 14, No 2 (2013): Spektra: Jurnal Fisika dan Aplikasinya
Publisher : Jurnal Spektra

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

Abstract

Material serpih atau material organik sejenisnya, masuk dalam kategori kerogen tipe II. Untuk mengembangkan dan membantu proses pengolahan atau pemanfaatan material organik tersebut, maka sangat perlu dilakukan penelitian yang lebih spesifik tentang material serpihberupa kelompok senyawa siklik/alifatik yang berakumulasi di dalam material clay tersebut.Material clay yang mengandung kaolinite/illite tentunya akan sangat mempengaruhi material organik tersebut, misalnyajumlah kandungan organik karbon dalam clay dan kematangan termalnya. Pengukuran tingkat kematangan termal materialclay-organik dilakukan berdasarkan harga temperatur maksimum (Tmax) dari analisis pirolisis. Hasil dari analisismenunjukkan bahwa material clay dengan volume yang lebih besar dari pada material organik ternyata sangat berperan besardalam proses maturasi. Kemudian jenis material clay yang didominasi oleh material karbonat, hasilnya menunjukkanpenurunan pada proses maturasi. Selain itu ditentukan juga tipe material serpih menggunakan data pirolisis rock-eval. Kombinasi antara indeks hidrogen (HI) dan Tmax pada diagram van Krevelen menunjukkan kerogen tipe II yang lebih cenderung berpotensi sebagai minyak dan gas.Kata kunci:material serpih, kerogen, kaolinite/illite, siklik/alifatik, maturasi
Total Organic Carbon (TOC) Value Prediction in Source Rock Potential at North East Java Basin, Indonesia Paulus Leonardo Manurung; Rahmat Catur Wibowo; Ordas Dewanto
Journal of Geoscience, Engineering, Environment, and Technology Vol. 6 No. 3 (2021): JGEET Vol 06 No 03 : September (2021)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2021.6.3.6644

Abstract

This research aims to determine the potential of the source rock in the Kujung and Cepu Formations in the North East Java Basin, using Total Organic Carbon (TOC). TOC is calculated using the Passey method. The Passey method is used by overlaying the sonic log and the resistivity log and determining the baseline to get the separation of Δlog resistivity, which is then used to predict the TOC log by including the LOM (Level of Organic Maturity) variable obtained from the data of vitrinite reflectance. After the TOC log value is obtained, a correlation is made with the TOC core value. The prediction result of TOC log in a PM-1 well is 2.16%, which means it has excellent quality. The prediction of TOC log in a PM-2 well is worth 2.68%, which means it has excellent quality. The correlation value between the TOC log and the TOC core of the PM-1 well is 0.67, which means the correlation is strong. In PM-2 well, the correlation between the TOC log and TOC core is 0.92, which means that the correlation is robust.
PEMANFAATAN AIR DATARAN TINGGI DI DESA BATU KERAMAT KECAMATAN KOTA AGUNG TIMUR, TANGGAMUS LAMPUNG Ordas Dewanto
Jurnal Pengabdian Kepada Masyarakat Sakai Sambayan Vol 4 No 1 (2020)
Publisher : Lembaga Penelitian dan Pengabdian Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jss.v4i1.153

Abstract

Desa Batu Keramat Kecamatan Kota Agung Timur, Kabupaten Tanggamus Propinsi Lampung, terletak pada daerah dataran tinggi. Masyarakatnya memiliki mata pencaharian 60% bertani dan berternak. Jenis usaha yang mereka lakukan ini sangat prospek untuk ditingkatkan, karena potensi air dari dataran tinggi sangat bagus. Hasil pengolahan data resistiviti menunjukkan bahwa titik pengukuran terdiri dari 5 lapisan tanah dan batuan. Dari identifikasi kelima lapisan dapat dikatakan bahwa pada titik pengukuran tersebut tidak ditemukan keberadaan akuifer air tanah. Dengan demikian dapat disimpulkan bahwa kedalaman air tanah di Desa Batu Keramat sebelah barat berada pada kedalaman yang sangat dalam, yang di atasnya terdapat batuan yang keras sehingga tidak mungkin untuk dibuat sumur gali. Solusinya membuat sumur bor dengan biaya yang sangat mahal dan sangat sulit untuk dilakukan. Jalan satu-satunya untuk mendapatkan air yaitu dari dataran tinggi air pegunungan. Oleh karena itu tim Pengabdian Unila mengajak masyarakat Batu Keramat khususnya Mitra (H. Eko Yulianto) untuk memanfaatkan air dari dataran tinggi menuju tempat ternak, tanaman dan rumah tangga. Metode kegiatan yang digunakan dalam kegiatan ini adalah metode participatory rural approisal yang melibatkan masyarakat dalam kegiatan secara keseluruhan. Pelaksanaan kegiatan ini melalui penyuluhan, pelatihan dan demonstrasi serta evaluasi untuk melihat efektivitas program sehingga program akan tersosialisasi dengan baik serta efisien. Metode lainnya meliputi desain pembuatan alat saluran air dan tempat usaha, demonstrasi dan pelatihan. Hasil yang diperoleh saat ini yang telah dikerjakan oleh Mitra dan Tim Pengabdian Unila adalah saluran air dari bak penampung menuju bak air mitra, kolam ikan dan tanaman. Peningkatan usaha sedikit demi sedikit mengalami kenaikan, yaitu dari tanaman dan ternak.
INVERSI GEOSTATISTIK MENGGUNAKAN ANALISA MULTI-ATRIBUT STEPWISE REGRESSION UNTUK KARAKTERISASI RESERVOIR Rahmat Catur Wibowo; Suci Ariska; Ordas Dewanto
JURNAL RISET GEOLOGI DAN PERTAMBANGAN Vol 30, No 2 (2020)
Publisher : Indonesian Institute of Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/risetgeotam2020.v30.1088

Abstract

Eksplorasi dan produksi pada reservoir tight sand sampai saat ini masih memiliki tantangan tersendiri karena karakterisitik porositas dan permeabilitas yang rendah. Penelitian ini dilakukan untuk menganalisis karakteristik reservoir tight sand berdasarkan peta persebaran properti log menggunakan inversi impedansi akustik (IA) dan analisis multi-atribut. Analisis multi-atribut stepwise regression adalah suatu metode yang menggunakan atribut-atribut yang paling baik untuk memprediksi log target dengan melalui proses trial and error. Pemilihan atribut seismik yang tepat dapat memberikan penggambaran zona target yang lebih baik. Penelitian ini dilakukan untuk memperoleh peta struktur geologi bawah permukaan, volume impedansi akustik. Kemudian dilakukan analisis multi-atribut untuk mendapatkan prediksi volume property log yang mencakup pseudo gamma-ray, densitas, dan porositas dengan menggunakan metode stepwise regression. Hasil inversi seismik IA dan analisis multi-atribut stepwise regression menunjukkan reservoir dengan fluida berupa gas, serta litologi tight sand yang memiliki rentang nilai IA sebesar 22.000 ((ft/s)*(g/cc)) sampai dengan 45.000 ((ft/s)*(g/cc)), densitas 2,25 g/cc sampai dengan 2,6 g/cc, dan porositas 5% sampai 12%. Peta densitas dan porositas yang diperoleh dari analisa multi-atribut menunjang tahap eksplorasi dan produksi jangka panjang. Hal tersebut terkait upaya untuk meningkatkan pemahaman tentang perangkap stratigrafi, dan kemenerusan lapisan reservoir. ABSTRACT – Geostatistical Inversion Using Multi-attribute Stepwise Regression for Reservoir Characterization. Exploration and production of tight sand reservoirs are still challenging due to their low porosity and permeability characteristics. This study used acoustic impedance inversion and multi-attribute analysis to analyze the tight sand reservoir characteristics based on the log property distribution map. Stepwise regression multi-attribute analysis is a method that uses the best attributes to predict the target log, which is carried out through a trial and error process. The ability to select a correct seismic attribution can provide a better depiction of the target zone. This research was conducted to obtain a subsurface geological structures map, acoustic impedance volumes. The multi-attribute analysis was performed to predict volume log properties such as pseudo-gamma-ray, density, and porosity, by using the stepwise regression method. The results of acoustic impedance seismic inversion and stepwise regression multi-attribute analysis show that the reservoir contains gas fluid with tight sand lithology, which has a range of acoustic impedance values of 22,000 ((ft/s)*(g/cc)) to 45,000 ((ft/s)*(g/cc)), the density of 2.25 g/cc to 2.6 g/cc, and porosity of 5% to 12%. The density and porosity maps obtained from the multi-attribute analysis can support the long-term exploration and production stages. The aims are to improve the primary recovery and tertiary recovery, understanding the stratigraphic traps, and the continuity of reservoir layers.
KARAKTERISASI RESERVOAR MELALUI ANALISIS PETROFISIKA BERDASARKAN DATA LOG SUMUR “TRD” FORMASI AIR BENAKAT Beny Chasandra; Ordas Dewanto; Ni Putu Juniari
Jurnal Geofisika Eksplorasi Vol 4, No 1 (2018)
Publisher : Engineering Faculty Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jge.v4i1.7

Abstract

The research area was located in South Sumatra Basin on Air Benakat Formation at South-East Jambi Province. The research conducted to know productive the interest zone by petrophysics analysis (volume shale water saturation, and porosity) and its characteristics by well-log. The lithology of TRD Well is sandstone with a few foraminifera. The interpretation based on the petrophysical analysis porosity of the 7th zone on TRD-10 is average 12,4%, saturation water 19,4% and volume shale 6,2%; the 7th zone on TRD-11 well is average porosity 16,2%, saturation water 41,3%, and volume shale 22%; the 11th zone on TRD-14 well is average porosity 33,2%, saturation water 21,2% and volume shale 1,2%; The 6th zone TRD-15 well, porosity 7,02%, saturation water 32,3% and volume shale 5,6%; On the TRD-17 well of the 7th zone is average the porosity 9,04%, saturation water 25,6% and volume shale 4,6%; and 4th zone of TRD-19 well, porosity 23,2% Saturation water 13,5% and volume shale 7,1%. The characteristics of hydrocarbon reservoir on TRD Wells have low water saturation is less than 50%, porosity more than 5% and volume shale less than 25%. From the result of petrophysics parameter value used as the indicator of the productive zone and interpreted that sand reservoir on well TRD has potentially for the reservoir zone with gas prospect.
ANALISIS PETROFISIKA UNTUK MENENTUKAN OIL-WATER CONTACT PADA FORMASI TALANGAKAR, LAPANGAN “FBT”, CEKUNGAN SUMATRA SELATAN Febrina Bunga Tarigan; Ordas Dewanto; Karyanto Karyanto; Rahmat Catur Wibowo; Andika Widyasari
Jurnal Geofisika Eksplorasi Vol 5, No 1 (2019)
Publisher : Engineering Faculty Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jge.v5i1.20

Abstract

In conducting petrophysics analysis, there are many methods on each property. Therefore, it is necessary to determine the exact method on each petrophysical property suitable for application in the field of research in order to avoid irregularities at the time of interpretation. The petrophysical property consists of volume shale, porosity, water saturation, etc. This research used six well data named FBT01, FBT02, FBT03, FBT04, FBT05, and FBT06 and also assisted with core data contained in FBT03. Core data used as a reference in petrophysical analysis because it was considered to have represented or closed to the actual reservoir conditions in the field. The area in this research was in Talangakar Formation, "FBT" Field, South Sumatra Basin. The most suited volume shale method for “FBT” field condition was gamma ray-neutron-density method by seeing its photo core and lithology. As for the effective porosity, the most suited method for the field was neutron-density-sonic method by its core. Oil-water contact was useful to determine the hydrocarbon reserves. Oil-water contact was obtained at a depth of 2277.5 feet on FBT01, 2226.5 feet on FBT02, 2312.5 feet on FBT03, 2331 feet on FBT04, 2296 feet on FBT05, and 2283.5 feet on FBT06. The oil-water contact depth differences at Talangakar formation in FBT field caused by structure in subsurface.
ANALISIS PETROFISIKA DAN PENYEBAB LOW RESISTIVITY RESERVOIR ZONE BERDASARKAN DATA LOG, SEM, XRD DAN PETROGRAFI PADA LAPANGAN X SUMATERA SELATAN Rita Aprilia; Ordas Dewanto; Karyanto Karyanto; Aldis Ramadhan
Jurnal Geofisika Eksplorasi Vol 4, No 2 (2018)
Publisher : Engineering Faculty Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jge.v4i2.13

Abstract

Hydrocarbon reservoir zone located on Low Resistivity is a typical and hidden oil and gas layer which always wrong in assessing as a water layer due to the complex geological origin and resistivity log limitation in identifying hydrocarbon. Presence of shale in a reservoir will decreasing resistivity value and increasing saturation value, so it can cause the results of the analysis to be pessimistic in the identification of hydrocarbons. In that case need to do analysis to core data on research area in order to know the cause of Low Resistivity on reservoir zone that having a probability of hydrocarbon content. Reservoir zone that has low resistivity value is at depth 1572-1577 mD. In this zone, it has a low resistivity value around 2.7- 4.4 ohm-m, with water saturation value around 47%-74% which causes on Low Resistivity reservoir zone to be between hydrocarbons and water reservoir zone. Then, on this research, Low Resistivity is also caused by Lamination Clay of shale type presence which consists of several types of Clay which can cause reservoir zone is at low resistivity value. This Clay type consist of Kaolite 20%, Illite 4%, and Chlorite 4% minerals as well as the presence of other minerals as proponent of low resistivity that is Quartz 60%, Plagioclase 9% and Calcite 3% as conductive minerals.
PREDIKSI PERMEABILITAS MENGGUNAKAN METODE LOG DAN PORE GEOMETRY STRUCTURE (PGS) PADA DAERAH CEKUNGAN JAWA BARAT UTARA Ayu Yuliani; Ordas Dewanto; Karyanto Karyanto; Ade Yogi
Jurnal Geofisika Eksplorasi Vol 6, No 1 (2020)
Publisher : Engineering Faculty Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jge.v6i1.57

Abstract

Determination of reservoir rock properties is very important to be able to understand the reservoir better. One of these rock properties is permeability. Permeability is the ability of a rock to pass fluid. In this study, the calculation of permeability was carried out using log and PGS (Pore Geometry Structure) methods based on core data, logs, and CT scans. In the log method, the calculation of permeability is done by petrophysical analysis which aims to evaluate the target zone formation in the form of calculation of the distribution of shale content (effective volume), effective porosity, water saturation, and permeability. Next, the determination of porosity values from CT Scan. Performed on 2 data cores of 20 tubes, each tube was plotted as many as 15 points. The output of this stage is the CT Porosity value that will be used for the distribution of predictions of PGS permeability values. In the PGS method, rock typing is based on geological descriptions, then calculation of permeability predictions. Using these two methods, permeability can be calculated in the study area. The results of log and PGS permeability calculations that show good correlation are the results of calculation of PGS permeability. It can be seen from the data from the calculation of PGS permeability approaching a gradient of one value with R2 of 0.906, it will increasingly approach the core rock permeability value. Whereas the log permeability calculation for core rock permeability is 0.845.
PERHITUNGAN CADANGAN HIDROKARBON FORMASI TALANG AKAR MENGGUNAKAN ANALISIS PETROFISIKA DAN SEISMIK INVERSI AI DENGAN PENDEKATAN MAP ALGEBRA PADA LAPANGAN BISMA, CEKUNGAN SUMATERA SELATAN Egi Ramdhani; Ordas Dewanto; Karyanto Karyanto; Nanang Yulianto
Jurnal Geofisika Eksplorasi Vol 4, No 3 (2018)
Publisher : Engineering Faculty Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jge.v4i3.37

Abstract

As a potential field in hydrocarbon prospect, Bisma field, the part of south Sumatra basin, can be evaluated in order to mapping the hydrocarbon accumulation and total reserve calculation purpose. Petrophysical analysis is an analytic method to evaluate the formation which sensitive with vertical contrast. Main output of this analysis is the compilation of some property value that useful on reservoir quality justification. Seismic acoustic impedance inversion is a method that can be used to define the distribution of porous zone as a hydrocarbon reservoir. This inversion result is the distribution of prospect area map by using combination of interpretation in AI map, density map and P-wave map. Map algebra is a calculation method that used to map that has the same grid number. By using those three methods, the reserve of hydrocarbon accumulation on Bisma field can be calculated. Petrophysical analysis results the indication of hydrocarbon in target zone is oil on two main layer, S and W3. Meanwhile, seismic inversion interpreting the distribution of porous zone is between 7400 – 9315 m/s*gr/cc in AI value context. Then, the effective porosity, Sw value and isopach are spread laterally using picked horizon and seismic acoustic impedance result as a guide, also, calculating the reserve. Layer S accumulating 21.1 million barrel oil and W3 accumulating 50.2 million barrel oil. This value resulted by aplicating Original Oil in Place (OOIP) equation on property map with map algebra approachment.
CHARACTERIZATION OF COAL SEAMS IN THE ARANTIGA AND SELUANG MINE BENGKULU USING PROXIMATE ANALYSIS DATA Rafi Maulana; Ordas Dewanto; A Raka Abriyansyah
Jurnal Geofisika Eksplorasi Vol 6, No 3 (2020)
Publisher : Engineering Faculty Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jge.v6i3.92

Abstract

Indonesia as a country that has ample large coal reserves spread across the Sumatera and Kalimantan islands. The huge potential in the region needs further research to be able to find out the quality and excellence of coal resources in order to know the characteristics in detail, then the research was carried out in the Bengkulu Province area by testing coal sample based on Proximate analysis to obtain accurate coal quality results and analysis of coal characteristics in the area can be carried out. The results show that the coal seams in the Arantiga mine have an average value Inherent Moisture is worth 7.49 %, ASH is worth 9.82 %, Volatile Matter is worth 40.99 %, Fixed Carbon is worth 41.70 %, Total Sulfur is worth 0.34 %, Gross Caloric Value is worth 6305 kcal/kg and including of High Volatile A Bituminous coal type, while the Seluang mine has an average value Inherent Moisture is worth 2.07 %, ASH is worth 22.92 %, Volatile Matter is worth 20.26 %, Fixed Carbon is worth 54.78 %, Total Sulfur is worth 0.55 %, Gross Caloric Value is worth 6365 kcal/kg dan and including of Medium Volatile Bituminous coal type.
Co-Authors A Raka Abriyansyah A Yuliantina Ade Yogi Aldis Ramadhan Alghifarry, Muhammad Budzar Andika Widyasari Aryka Claudia Eka Putri Ayu Yuliani Bagus Sapto Mulyatno Bambang Irawan Bambang Irawan Bambang Soegijono Beny Chasandra Damayanti, Elok Dani, Ilham Darsono Darsono Egi Ramdhani Egi Ramdhani Erfani, Sandi Febrina Bunga Tarigan Hayu Nurfaidah Hesti Hesti Hidayatika, Akroma I Gede Boy Darmawan Ignatius Sonny Winardhie Ilham Dani Imam Setiadi Isti Nur Kumalasari Istifani Ferucha Istifani Ferucha Karyanto, Karyanto Kumalasari, Isti Nur Muh Sarkowi Muhammad Sarkowi Muhammad Sarkowi Mulyatno, Bagus S Nanang Yulianto Nanda Hanyfa Maulida Ni Putu Juniari Paulus Leonardo Manurung Rafi Maulana Rafi Rilo Pambudi Rahmi Mulyasari RahmiMulyasari, Rahmi Restu Ningsih Rita Aprilia Riza Rahardiawan Ryan Donovan Sri Rizky Suci Ariska Suharso Suharso Suharso Suharso Suharso Suharso Syamsurijal Rasimeng Varenza Novita Yandi Wibisono, Ambrosius Hernawan Wibowo, Rahmat Catur WP Prihadita Yandi, Varenza Novita