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Geological Engineering E-Journal
Published by Universitas Diponegoro
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Geological Engineerinb E-Journal menerima artikel-artikel yang berhubungan dengan Geologi Umu, Geologi Migas, Geologi Teknik, Panasbumi, dan Air Tanah.
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Articles 85 Documents
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Geological Engineering E-Journal Volume 1, Nomor 1, Tahun 2013
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Geological Engineering E-Journal Volume 1, Nomor 1, Tahun 2013
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Eksplorasi batubara Pranowo, Bambang
Geological Engineering E-Journal Volume 1, Nomor 1, Tahun 2013
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ANALISIS HASIL PENGUJIAN SONDIR UNTUK MENGETAHUI PENINGKATAN KEKUATAN TANAH SANGAT LUNAK DI LOKASI GATE HOUSE DALAM PEKERJAAN “GROUTING AT SEMARANG PUMPING STATION & RETARDING POND” Wibowo, Hendry Tri
Geological Engineering E-Journal Vol 5, No 2 (2013): Volume 5, Nomor 2, Tahun 2013
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The water building structure at the mouth of the Semarang river as a flood prevention building in Panggung Lor village is a high settlement risk building structure. This is caused by lithological estuary region consisting predominantly of fine clay-sized sediments with a low level of consistency. The low value of consistency is comparable to the soil bearing capacity value of the water structure foundation pillars. Analysis of the Semarang river Gate House cone penetration test results aims to determine the increase of soil bearing capacity with the method of grouting on the site by using the cone penetration test results. From the three trial soil penetration test location before the grouting process, the very soft clay was found in the 0,6 to 15 metres in depth with 1 up to 4 kg/cm2 of cones resistance value. For deepness 14,00 m - 20,00 m there are soft clay with cones resistance value ( qc) 5 - 8 kg / cm2.. The determining processes of soil bearing capacity then consist of several processes. Based on this, the ultimate bearing capacity mean value before the grout process is about 19,45 with the allowable bearing capacity mean value about 3,97 ton.   The ultimate bearing capacity mean value after the grout is about 38,557 ton with the allowable bearing capacity mean value 7,8625 ton. It appears that the increase of ultimate bearing capacity is about 98 % or about 1,9 times greater than before.
STUDI SIKUENSTRATIGRAFI BERDASARKAN HASIL ANALISIS DATA PALINOLOGI PADA SUMUR Y, CEKUNGAN SUMATERA SELATAN Ramadhan, Rizki; Nugroho, Hadi; Aribowo, Yoga; Panuju, Panuju
Geological Engineering E-Journal Vol 5, No 1 (2013): Volume 5, Nomor 1, Tahun 2013
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Palynology is a study of biostratigraphy for determining relative age and depositional environment basedon the abundance of palynomorf. Palynology study develompent in Indonesia is still could be more increasedalong with more oil and gas exploration moved to transitional environtment.Study of palynology in stratigraphy is aiming to determine relative age and depositional environment.Besides, palynology could also determine sequence stratigraphy in a large scale of study based on palynomorfpercentage. The study of sequence stratigraphy based on palynomorf percentage has been done in Well-Y, SouthSumatra basin.The method of this research is descriptive method through the microscopic observation on sample 1 - 14from 1400 m depth Y-Well’s cutting and quantitative method calculation and analysis method from thisobservation and calcuation could determine the percentage of each palynomorf. This percentage lead to a trendthen interpretated into several sequencestratigraphy.From this observation, it can be determined characteristic zone of this well. The characteristic zone ofpalynology in this well is divided into 3 zones of palynology; Proxapertites operculatus Zone, Flocshuetziameridionalis Zone, and Stenoclaeniidites papuanus Zone. Each zone shows the characteristic of age fromEocene to Pliocene and also depositional environment from delta plain to pro delta. From palynomorfpercentage trend, we may also see the pattern of sequece stratigraphy works in this depth. The percentage trendshows the time whether sea level fall at the minimum percentage of palynomorf and sea level rise at themaximum percentage of palynomorf. The trend shows the sequence with sequence boundary lying in the startand the end of the sequence and also transgressive surface indicates the sea level start rise. Overall, this wellhas 5 sequences based on this trend; sequence a, sequence b, sequence c, sequence d, and sequence e and all thesequences are bordered by sequence boundary.
PEMODELAN PEMASANGAN PENYANGGA SEMENTARA MENGGUNAKAN PERANGKAT LUNAK PHASE 2 PADA HEADRACE TUNNEL CHAINAGE 45 M – 155 M DI PLTA TULIS KABUPATEN BANJARNEGARA, JAWA TENGAH Mahmud, Ghozali
Geological Engineering E-Journal Vol 5, No 1 (2013): Volume 5, Nomor 1, Tahun 2013
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In the process of tunnel construction, the support design process is a very important thing to do. This process must be done carefully and thoroughly in order to obtain cost efficiencies expenditureon the tunnel project. Because the total expenditure in the construction of a tunnel is not cheap. This support planning process itself is divided into two namely the planning of temporary andpermanent support. The support planning usually is done before and the time of tunnelconstruction. This research aims to model the geological conditions around the tunnel, the tunnel pit conditions before supporting system installed, and the temporary support design of theheadrace tunnel of Tulis Hydropower Banjarnegara Residence, Central Java Province. So we willknow types of the most appropriate support based on physical properties, rock mechanics and rock mass behavior along the tunnel. The research method used is descriptive and experimentalmethods. By way of temporary support modelling in headrace tunnel with Phase2 software . In thisresearch will analyze and make temporary support models of 45 m – 155 m chainage the headrace tunnel. In the chainage will be made 3 models (II b, III a, and III b) based on rock mass ratingvalue Based on the modelling results it is known that for class II b has a total displacement of < 5mm. So the installation of supports on class II b is relatively stable and secure there will be no collapse of the tunnel. As well as combinations obtained temporary support is most effective with atotal value that is the smallest displacementnya shotcrete 1 variations is 50 mm; 3 m long of rockbolts with spaced 2 m and 10 of its number ; shotcrete 2 variations 100 mm. Whereass the rock mass class III A and III B have > 5 mm in the result of total displacement. So the tunnel is will notstable and secure with a variety of shotcrete and rock bolts that has been done. It would requirethe addition of another temporary support variant form of steel set as installation instructions and supporting the tunnel excavation (After Bieniawski, 1989).
PENGARUH STRUKTUR DAN TEKTONIK DALAM PREDIKSI POTENSI COALBED METHANE SEAM PANGADANG-A, DI LAPANGAN “DIPA”, CEKUNGAN SUMATERA SELATAN, KABUPATEN MUSI BANYUASIN, PROVINSI SUMATERA SELATAN Pratiwi, Ragil; Nugroho, Hadi; Widiarso, Dian Agus; Lesmana, Rana
Geological Engineering E-Journal Vol 5, No 2 (2013): Volume 5, Nomor 2, Tahun 2013
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The increasing of oil and gas and energy crisis nowadays has been causing the explorationist look forthe new energy sources such as gas in shale and coal which more environmentally friendly. SouthSumatera Basin is one of Indonesian Basin which has a large potency with 183 tcf. Methane gas isstored in natural fracture of coalbeds called cleat. Cleat was produced during coalification andtectonism process.The aim of this study is to evaluate the influence of structures and tectonism processes towards theCBM potency in an area. The research methods were done by desciptive and analysis methods.Descriptive method was done by describing secondary data which contain rock mass data, andanalyzing method was done by analyzing subsurface data consist of seismic and wireline log. Thosedata were used to determine the sweetspot area and calculate gas in place in target zone of CBM.Based on geologic structure analysis, primary orientation trends which configure geologic structuresis northeast-southwest, it is a Compression Phase of Miocene-Recent. This stress configured sincline,sinistral strike-slip fault, and normal faults in tensional phase. The interesting area of CBMexploration or sweetspot area located in the northeast area, with normal faults which control fracturepermeability reach 12,22 mD, high thickness reach 14 – 18 feet (4,7 – 6 meter), and CBM targetdepth of < 6000 feet (2000 meter), and gas in place calculation reach 0,742 tcf. Completiontechniques for CBM target in study area with relatively low permability are hydraulic fracturingcompletion and horizontal well with direction of well is relatively northeast-southwest whichperpendicular with face cleat. 
PENINGKATAN DAYA DUKUNG TANAH URUGAN DENGAN METODE GROUTING DI SMK TEUKU UMAR SEMARANG, JAWA TENGAH Manalu, Agnes Maria Mutiha
Geological Engineering E-Journal Vol 5, No 1 (2013): Volume 5, Nomor 1, Tahun 2013
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It is very important to note in bearing capacity of soil in development of multi-storey buildings. There are somegeotechnical investigation can do to determine the value of bearing capacity of soil. One of them is cone penetration test.The location of three-storey building site SMK Teuku Umar, Karangrejo, Semarang has soils that dominated by clay.Soil located in the research area is quarry with low soil strength.The purpose of this research was determine the type ofsoil and the bearing capacity of soil in the areas of research, to know grouting method used to increase the strength ofsoil, to determine the bearing capacity of soil before and after grouting, and to know increasing the bearing capacity ofsoil from the work of grouting. The method used in this research is conducting geotechnical investigations in the formcone penetration test. This cone penetration test calculate the value of conus resistance on the subsurface with a certaindepth, then the results of the testing is done processing data to determine the value of bearing capacity of soil containedin the three-storey building site SMK Teuku Umar, Semarang, Central Java. The type of soil in research location isburial land which is dominated by clay to sandy silt. The value of bearing capacity of soil permits at cone penetrationtest’s point 1 before grouting >100 ton/m2 obtained at a depth of 6,4 m. After installing grouting, it found at a depth of3,6 m. At cone penetration test’s point 2, bearing capacity of soil permits before grouting >100 ton/m recentlyrecovered at a depth of 6,6 m. After installing grouting, has been found at a depth of 3,8 m. At cone penetration test’spoint 3, value of bearing capacity of soil permits is increased very high, at depth of 1,6 m has had bearing capacity ofsoil permits >100 ton/m2. Method of grouting has increased the value of bearing capacity of soil. 2
STUDI FASIES FORMASI TANJUNG, SUB. CEKUNGAN BARITO UTARA, DAERAH BENANGIN, BINTANG NINGGI DAN SEKITARNYA, KABUPATEN MUARA TEWEH, PROVINSI KALIMANTAN TENGAH Pati, Gesang Panggrahito
Geological Engineering E-Journal Vol 5, No 1 (2013): Volume 5, Nomor 1, Tahun 2013
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Objek penelitian merupakan Formasi Tanjung yang termasuk bagian dari Cekungan Barito. Cekungan Barito Utara adalah salah satu cekungan yang sudah terbukti menghasilkan hidrokarbon di daerah Kalimantan Tengah. Salah satu yang menjadi target eksplorasi pada Sub-Cekungan Barito Utara adalah Formasi Tanjung yang berumur Eosen. Sedikitnya informasi dan penelitian mengenai karakter sedimentologi dari Formasi Tanjung menjadikan salah satu problem eksplorasi hidrokarbon di daerah ini.  Lokasi penelitian terletak di daerah Benangin dan sekitarnya, Kabupaten Muara Teweh, Provinsi Kalimantan Tengah. Luas lokasi penelitian adalah 300 km2.Tujuan dari penelitian ini adalah untuk mengetahui jenis-jenis dan karakter fasies dari Formasi Tanjung, mengetahui umur, bathimetri dan lingkungan pengendapan batuan, dan mengetahui arah tegasan utama yang mempengaruhi sedimen di Cekungan Barito bagian Utara.Metode Penelitian dilakukan dengan metode survei dan metode analisis. Metode chaining merupakan pemetaan batuan menerus, yaitu dengan melakukan stratigrafi terukur pada lintasan yang sudah ditentukan, dari masing-masing lintasan akan diikat (chain) dan dikorelasikan satu dengan yang lain. Metode analisis yang dilakukan adalah analisis petrografi dan analisi biostratigrafi.Secara umum Formasi Tanjung daerah penelitian dibagi menjadi 2 yaitu Formasi Tanjung bagian bawah (Lower Tanjung Formation) merupakan lingkungan pengendapan fluvial yang dipengaruhi oleh proses fluviatil di daerah Bintang Ninggi dan Formasi Tanjung bagian atas (Upper Tanjung Formation) lingkungan pengendapan delta yang dipengaruhi oleh proses fluvial dan tide secara dominan di daerah Benangin. Di daerah penelitian, Formasi Tanjung bagian bawah (Lower Tanjung Formation) terdiri dari beberapa Fasies yaitu : Fasies Sungai Teranyam (Braided River), Fasies Sungai Berkelok (Meandering River). Dan Formasi Tanjung bagian atas (Upper Tanjung Formation) terdiri dari 2 Fasies yaitu: Fasies Delta Plain yang tersusun dari Fasies Tidal Flat, Channel Fills, Distributary Channel, Flood Plain Deposite, Mouth Bar dan Fasies Delta Front yang tersusun dari Fasies Tidal Bar dan Distributary Mouth Bar. Maka lingkungan pengendapan Formasi Tanjung daerah penelitian adalah Lower Delta Plain -Delta Front yang didominasi oleh proses Fluvial & Tidal (Tide dominated delta front).
ANALISIS PETROFISIKA DENGAN METODE DETERMINISTIK DAN PROBABILISTIK SERTA PERHITUNGAN VOLUME HIDROKARBON DENGAN METODE WELL BASIS PADA SUMUR MG-04 DI STRUKTUR MUSI, CEKUNGAN SUMATERA SELATAN PT. PERTAMINA EP REGION SUMATERA Sari, Mega; Nugroho, Hadi; Hidajat, Wahju Krisna; Satriawan, Oki
Geological Engineering E-Journal Vol 5, No 1 (2013): Volume 5, Nomor 1, Tahun 2013
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Well logging is a measurement technique to obtain the subsurface data using instrument inserted intowellbore, to evaluate formation and rock characteristics identification beneath the surface. Formation evaluationaims to identify zones of reservoir rock, formation fluid type, and to obtain petrophysical parameters of reservoirrocks such as shale volume, rock porosity, permeability, water saturation at the research area, the well MG-04 weredrilled in the Musi Structure, South Sumatra Basin, PT. Pertamina EP. The purpose of this research is identifying productive layer on an exploration well in Musi Structure, SouthSumatra Basin. In addition, to determine the value of petrophysical rock parameters which recorded in a log curvesgenerated during logging and calculating the volume of hydrocarbon in exploration well as a consideration, priorto further exploration and exploitation. This research using descriptive methods and petrophysical analysis. The descriptive method includesliterature study of the basics concept on determining rock petrophysical parameters to be used. The analyticalmethod using deterministic and probabilistic method to determine petrophysical parameters, also “well basis”method to calculate the volume of hydrocarbons. Based on wireline logs analysis, well MG-04 known has two reservoir zones, namely oil reservoir in zone 2and gas reservoirs in zone 4. In zone 2, the reservoir rock is shaly sandstone with little amount of glauconite. Inzone 4, the reservoir rock is limestone, so this is a necessary to analyze the shaly sandstone with different methodsto the interpretation of limestone to obtain the correct value of petrophysical parameters. After calculation ofpetrophysical parameters in deterministic and probabilistical way with “wet-clay” models, obtained two log plotmodels that have close values, and it is known that the oil reservoir in zone 2 not potential for production, but gasreservoir in zones 4 the potential to do exploitation/ production. After the interpretation of petrophysicalparameters, it is known in zone 4 has a net pay thickness 68.43 m, total porosity percentage 28.42 to 29.72%,effective porosity 25.57 to 26.32%, permeability 56376,2 mD, water saturation 13.49 to 15.35% and shale volume 5to 10.5%. After obtaining reservoir petrophysical parameters, next step is hydrocarbon volume calculation using the“well basis” method, supported by pressure build up (PBU). Based on this analysis, it is known that total volume ofgas in the reservoir hydrocarbon type is estimated at 5088.4 MMSCF.