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METODE GROUTING UNTUK MENINGKATKAN DAYA DUKUNG TANAH DI BANGUNAN STASIUN POMPA DRAINASE SIBULANAN, PEKALONGAN, JAWA TENGAH Murdani, Surya
Geological Engineering E-Journal Vol 5, No 2 (2013): Volume 5, Nomor 2, Tahun 2013
Publisher : Geological Engineering E-Journal

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Sibulanan drainage pump station located on Slamaran beach recreation area, have an excessive settlement due to a lack of soil bearing capacity on the study site. Soil material in study site is transported soil, with a fine sandy clay silt lithology. The type of soil that is a young alluvium sediments which have not been consolidated resulted a low bearing capacity in study site, drives an excessive settlement. In this study, sounding is used to gather the data. Determination of soil types and soil consistencyuse fr and qc relationship from Bowles, 1997 and classification of soil consistency from Terzaghi and Peck, 1984. Soil bearing capacity calculations using the bearing capacity of pile foundation formulas from Wesley, 1977. Based on field observations in study site, low bearing capacity of the soil caused by transported soil and influence of tides. While based on sondir data analysis, the study found, type of soil in study site form of clay until silty clay with qc values = 1.17 to 1.96 mpa and soil consistency is very soft until firm with qc values = 2.00 to 20.00 kg/cm2 in depth of 23 meters. Soil bearing capacity at depth of 12 meter is only 3.8 tons. Grouting that was carried out by 52 points aimed to improving soil consistency and soil bearing capacity in study site until greater than 4.8 tons at depth 12 meters. Once grouting done, soil consistency of the study site turns into very soft until very stiff with qc values = 2.00 to 90.00 kg/cm2 at depth 8.20 meters. Soil bearing capacity at depth 12 meters turns into 39.75 tons. Grouting methods in this study has been successfully increasing soil bearing capacity at depth 12 meters to be greater than 4.8 tons, making soil bearing capacity in the sudy to be secure.Â

MODEL KONSEPTUAL PERKEMBANGAN DELTA SEPINGGAN, INTERVAL âMFS 1-MFS 5â, BLOK SOUTH MAHAKAM, CEKUNGAN KUTAI, KALIMANTAN TIMUR Permana, Irfandi Oky; Nugroho, Hadi; Hidajat, Wahju Krisna
Geological Engineering E-Journal Vol 6, No 2 (2014): Wisuda Periode Juli - Oktober 2014
Publisher : Program Studi Teknik Geologi, Fakultas Teknik, Universitas Diponegoro

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The energy demandÂ are growing by day,Â especially in Indonesia, whereas these needs are not matched by the number of oil and gas production in Indonesia. This case is evidenced by the release of Indonesia as a member of an organization of oil exporting countries on October 9-10, 2008 in Vienna (Kompas, 10 October 2008). Thus required a study on the potential of producing hydrocarbon basin that will be expected to meet the energy demand of the oil and gas in Indonesia. One of the basins in Indonesia is the Kutai Basin which is the largest and widest Tertiary Basin in western Indonesia. The study area is located at the South Mahakam, Kutai Basin, East Kalimantan. This study aims to make conceptual model of delta Sepinggan development. The method included analysis of well log analysis method, 2D seismic analysis method, method of data analysis of rock core and biostratigraphic data analysis method. Based on analysis results can be obtained in the form of variations in lithology information on Sepinggan Zone deltaic sequence at intervals of MFS 1-MFS 5 marker are coal, sandstone, shale and limestone. Â Process on Sepinggan Delta are regretion process dominated on Early Miocene â Middle Miocene (N4-N14), and transgretion process on Middle Miocene âLate Miocene (N14-N16). Sedimentation process influenced by East Manpatu Fault that increasing accomodation space in Rocky Field area, so sediment layer in Rocky Field area is thicker 60-150 meter than Zahra-Zidane Field area.

GEOLOGI, ALTERASI HIDROTERMAL DAN MINERALISASI DAERAH CIURUG DAN SEKITARNYA, KECAMATAN NANGGUNG, KABUPATEN BOGOR, PROVINSI JAWA BARAT Agus Binsar, Mohammad Tommy; Aribowo, Yoga; Widiarso, Dian Agus
Geological Engineering E-Journal Vol 6, No 2 (2014): Wisuda Periode Juli - Oktober 2014
Publisher : Program Studi Teknik Geologi, Fakultas Teknik, Universitas Diponegoro

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The existence of metallic minerals in nature is closely related to geological conditions and hydrothermal alteration. hydrothermal alteration and mineralization occur due to hydrothermal solutions that change the physical and chemical properties of rocks and carrying metal elements which will be deposited on rock porosity and permeability have. hydrothermal alteration will make a special characteristic as an altered mineral association. Study of this alteration zone and mineralization will help us to make a plan for metal resources exploration. The purpose of this study was to determine the geological conditions study area include the morphology , lithology , structural geology , hydrothermal alteration zones , mineralization and determine the relationship between geology , hydrothermal alteration , and mineralization.Methods of research is using survey and analysis methods. Survey conducted by the method of data that collected in the field in the form of surface geologicalÂ Â mapping.Â Â TheÂ Â analysisÂ Â method Â Â Â Â wasÂ Â Â Â analysisÂ Â Â ofÂ Â Â petrology, petrography, X-ray (XRD), and geological structure.Regional geomorphology of Ciurug Area classification based on Van Zuidam (1983) is divided into two units , namely units steep hilly volcanic landforms and volcanic landform units is very steep mountains. Lithology of the study area consists of older to younger andesite breccia , andesite lava, lapilli tuff , tuff , and andesite intrusion . Geological structure of the study area has a north-south direction . Hydrothermal alteration zones are present in the study area is the zone of argillic ( Illit - Kaolin ) , propylitic zone ( Smectite - Chlorite ) , and silicified zones ( Silica - Quartz ) . Mineralization in the area of research in the form of quartz veins and disseminated pyrite and chalcopyrite mineralization as ore deposits . Type of sediment deposition area of researchÂ Â isÂ aÂ Â lowÂ Â sulfidation epithermal type.

GEOLOGI DAN ALTERASI HIDROTERMAL DAERAH BANTAR KARET DAN SEKITARNYA, KECAMATAN NANGGUNG, KABUPATEN BOGOR, PROVINSI JAWA BARAT Febriyana, Rizal Dwi; Aribowo, Yoga; Widiarso, Dian Agus
Geological Engineering E-Journal Vol 6, No 1 (2014): Volume 6, Nomor 1, Tahun 2014
Publisher : Geological Engineering E-Journal

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Alteration type at zone of mineralization has its own properties and characteristics that often characterized by the presence of mineral assemblage. The existence of alteration zone occurred due to changes mineral composition of rocks as a result of interaction between fluida of hydrothermal and wall-rocks. Alteration of hydrothermal is very closely linked with mineralization. Mineralization is an assembly and accumulation process of valuable rare minerals in the rocks to form ore deposits. Geological studies related to the characteristics and distribution of alteration and mineralization will assist in the planning of exploration process in the area. The aim of this study is to know the condition of geological research area that include variation of morphology, stratigraphy, structural of geology, alteration types are develop in the study area, as well as the relationship between altered minerals the result of hydrothermal alteration to precipitate epithermal mineralization in the study area.The methods used in this study include field mapping, followed by the method of sample analysis. Method of field mapping carried out by observing the lithology, structural of geology, geomorphology and alteration at Bantar Karet and surrounding areas, Nanggung subdistrict, Bogor Regency, West Java . Method of analysis carried out by analysis of petrology, petrography, mineralgraphy , X - ray diffractometer and the structure analysis of the lineament pattern.Lithology of the research area, beginning Early Miocene with sequence from old to young are unit of laminated tuff, unit of volcanic breccia, unit of andesite lava, unit of lapilli tuff, unit of tuff and unit of dacite intrusion. Structural of geology that develop in the study area are joint, fault that related with the lineament pattern, the main direction are Southwest-Northeast and Northwest-Southeast. Geomorphology of the study area was divided into two : the unit of volcanic landforms are very steep mountains and the unit of volcanic landforms are steep hilly. Alteration zones are contained in the study area, becoming three zones, there are Chlorite Â± Smectite Alteration Zone (Propylitic), Smectite Alteration Zone - Kaolinite Â± Montmorillonite (Argillic) and Silicified Zones. The mineralization exist are dessiminated Pyrite as ore mineral and oxide mineral such as Hematite which is the alteration of Magnetite and Feromagnesian on temperature conditions < 260oC. Characteristics of deposition types that developed in the study area based on the identification of geology, included alteration and mineralization is low sulphidation epithermal.

GEOLOGI, KARAKTERISTIK DAN GENESA ENDAPAN LATERIT BAUKSIT PT. ANTAM (Persero) Tbk, UNIT GEOMIN, DAERAH KENCO, KABUPATEN LANDAK, PROVINSI KALIMANTAN BARAT Ramadhan, Fachrul Rozi; Aribowo, Yoga; Widiarso, Dian Agus; A, Betraz
Geological Engineering E-Journal Vol 6, No 1 (2014): Volume 6, Nomor 1, Tahun 2014
Publisher : Geological Engineering E-Journal

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Bauxite mining is one of the business units that started to increase mine in Indonesia because it has considerable economic value in the scale of quantity and quality. One of the prospective locations are in areas Kenco, Landak District, West Kalimantan Province. Kenco is an area that addressed the rest of the development of Cretaceous volcanism consisting of the island of Borneo Volcanic Formations Mensibau with unit members Granodiorite, quartz diorite and diorite, and the Formation of the Kingdom Volcanic Andesite-trachite units and Formations of alluvium and swamp sediment quarter. Bedrock types that tend to be acid-intemediet bauxite will produce certain characteristics that are different from the dominant rock properties of acids or bases. Rock intensively weathered have the potential to form a precipitate lateritic bauxite. Conducted a detailed mapping is the next steps of regional mapping to narrow the area of bauxite mineral mining resource prospects.Â Â Â Â Â Â Â Â Geological aspects and lateritic bauxite deposit genesis process on the site is a very interesting research material. Based on field mapping, Gibsite is the bauxite formed with frame type is the result of weatherin sediment residue on the soil catena. The study area consists of rocks that form lateritisation overburden, soil laterite, iron cap /gossan, saprolite and bedrock layers. Lateritic bauxite deposit formation is largely controlled by bedrock type, time, climate (rainfall), morphology, changes the face of groundwater, and vegetation destruction process involving a series of rocks, minerals leaching, transport and deposition of mineral elements of chemical residues.Â Â Â Â Â Â Â Â Lateritic bauxite sludge characteristics according to the analysis of X-Ray Diffraction (XRD) on a layer of overburden to ore (saprolite layer) shows the mineral composition Nacrite, Kaolinite, Gibsite, Goethite, Quartz, Nordstandite, Hematite, and Dickite. The average mineral formed at neutral pH tends to be acidic by 5-7 and temperatures below 150oC. The analysis of X-Ray Fluorescence (XRF) shows the rock has certain characteristics which, if averaged Aluminum trihydrate (Al2O3) as much as Â±33%, Iron (II) trihydrate (Fe2O3) of about Â±8.5%, Silicate oxide (SiO2) approximately Â± 43%, Titanium oxide (TiO2) approximately â¤1% and total silicate (R-SiO2) approximately â¤7%. Saprolite layer showed a thickening layer on the hillside at an angle of 20 - 25o, while the section near the top of the hill or valley will be thinned. The results showed that the value of XRF levels bedrock formation of bauxite have economic value to the content of Al and Fe but less to a total content of Si and Si.

POTENSI SITUS-SITUS WARISAN GEOLOGI DI AREA KARS GUNUNG SEWU SEBAGAI PENDUKUNG DAN PELUANG PENGEMBANGAN GEOPARK DI INDONESIA UNTUK ASET GEOWISATA KREATIF Permadi, Reza; Rachwibowo, Prakosa; Hidajat, Wahju Krisna
Geological Engineering E-Journal Vol 6, No 2 (2014): Wisuda Periode Juli - Oktober 2014
Publisher : Program Studi Teknik Geologi, Fakultas Teknik, Universitas Diponegoro

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Kars Gunung Sewu yang melingkupi wilayah Gunungkidul, Wonogiri dan Pacitan merupakan salah satu kawasan Kars yang paling terkenal di Jawa karena kekhasan dan keunikan Karsnya.Â Gunung sewu secara geologi terbentuk dari batugamping berumur Neogen (Miosen Tengah) dengan ketebalan mencapai lebih dari 200 m. Karena ciri khas morfologinya menjadikan Gunung Sewu terpilih sebagai kandidat Geopark (Taman Bumi) di Indonesia. Geopark merupakan suatu konsep manajemen pengembangan kawasan secara berkelanjutan, yang memadu-serasikan tiga keragaman alam, yaitu keragaman geologi (geodiversity), keragaman hayati (biodiversity), dan keragaman budaya (cultural diversity), dengan tujuan untuk pembangunan serta pengembangan ekonomi kerakyatan yang berbasis pada asas perlindungan (konservasi) terhadap ketiga keragaman tersebut.Â Sebanyak 30 geological heritage dan 3 non-geological heritage yang berada di Kawasan Kars Gunung Sewu yang diakui sebagai geopark atau taman geologi nasional oleh Badan Geologi Kementerian Energi Sumber Daya Mineral. Situs-situs ini ditargetkan akan dikelola oleh masyarakat dengan berbasis pemberdayaan masyarakat.Berdasarkan hasil analisis citra landsat Area Kars Gunung Sewu dikelompokkan menjadi 4 Satuan yaitu : Unit K1 Dataran Tinggi Kars, Unit K5 Dataran Alluvial Kars, Unit K6 Doline dan Unit K8 Lembah Kering (Brahmantyo B, 2006). Hasil analisis SWOT dan scoring self-assesment yang melingkupi Keadaan Geologi, Struktur Manajemen, Edukasi Lingkungan, Geotourism dan Perkembangan Ekonomi Daerah secara berkelanjutan didapat nilai 73,25%, angka tersebut (lebih dari 50 %) yang berarti Kawasan Kars Gunung Sewu sangat layak untuk bergabung ke dalam Jaringan Global Geopark National oleh UNESCO. Sebab, pengembangan kawasan geopark memiliki dampak yang sangat besar untuk pariwisata yang mendorong pertumbuhan ekonomi masyarakat setempat juga kebutuhan Negara.

ANALISIS SIKUEN STRATIGRAFI DAN PEMODELAN FASIES FORMASI TANJUNG BERDASARKAN DATA LOG SUMUR DAN DATA INTI BATUAN PADA LAPANGAN MIR CEKUNGAN BARITO, KALIMANTAN SELATAN Ridwan, Muhammad Ilham; Nugroho, Hadi; Aribowo, Yoga; Indah, Mill Sartika; Putra, Perdana Rakhmana
Geological Engineering E-Journal Vol 6, No 2 (2014): Wisuda Periode Juli - Oktober 2014
Publisher : Program Studi Teknik Geologi, Fakultas Teknik, Universitas Diponegoro

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Increased consumption of energy resources of oil and gas, exploration and exploitation process results performed optimally. Interpretation of subsurface using well log data combined with geological disciplines becomes very important in increasing exploration. Location of the study lies in one of the field located in the Barito basin of South Kalimantan province owned by Pertamina UTC. This research was done in the implementation of the final project addressed the subject of mapping subsurface using sequence stratigraphic approachs.The purpose of this research is to determine the type of lithology, facies and depositional environment, sequence stratigraphy, distribution of sedimentation and facies modelling Tanjung Formation in the MIR field. This research is using descriptive method and analytical methods. Descriptive method is a method that does some literature review. While the analysis method is using qualitative analysis to determine the type of lithology, stratigraphy and facies modeling sequence. This analysis uses software petrel 2009 in an analysis of well logs in the distribution of lithology, stratigraphic marker horizon correlation, subsurface mapping and facies modelling.Based on the results of the data analysis and discussion, it can be interpreted that the Tanjung Formation in the MIR field has a type silisiklastik sandstone lithology (sandstone), shale (shale) and coal (coal) with depositional environment in estuarine area. The results of the analysis of stratigraphic marker is 2 MRS (Maximum Surface Regression), 5 FS (Flooding Surface), 2 MFS (Maximum Flooding Surface) and 1 SB (Sequence Boundary) with sequence stratigraphic unit 2 Lowstand System Track (LST), 2 Transgressive System Track (TST) and Highstand System Track 1 (HST). Direction of sedimentation cycles in Tanjung Formation sequence stratigraphy approach leads to Northwest â South east (NNW - SSE). Facies models are divided into two zones: the ZR1 zone and ZR2 zone, where the zone was conducted to calibrate the rock core data. Based on core analysis Estuary facies rocks have Chanel and Tidal flat on Keywell. According to core data support and electrofasies in the study site, there are 3 facies deposition environmental: Chanel Estuary , Tidal flat and Tidal Bars.

ANALISIS LITOLOGI DAN STRUKTUR GEOLOGI BERDASARKAN CITRA LANDSAT PADA AREA PROSPEK PANASBUMI GUNUNG TELOMOYO DAN SEKITARNYA, KABUPATEN MAGELANG, PROVINSI JAWA TENGAH Agista, Zendi; Rachwibowo, Prakosa; Aribowo, Yoga
Geological Engineering E-Journal Vol 6, No 1 (2014): Volume 6, Nomor 1, Tahun 2014
Publisher : Geological Engineering E-Journal

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Komplek Gunung Telomoyo merupakan salah satu daerah prospek panasbumi di Indonesia ditandai dengan munculnya manifestasi panasbumi di sekitarnya. Komplek Gunung Telomoyo terletak di Kabupaten Semarang dan Kabupaten Magelang. Secara fisiografis terletak pada Zona Solo. Penelitian ini bertujuan untuk mendapatkan gambaran tentang model sistem panasbumi komplek Gunung Telomoyo berdasarkan data litologi, struktur geologi dari kenampakan citra satelite. Metode penelitian meliputi interpretasi citra, pengamatan lapangan yang dilanjutkan dengan metode analisis.Dari hasil interpretasi citra satelite, didapatkan interpretasi litologi, geomorfologi dan pola kelurusan (lineament). Citra landsat yang digunakan yaitu citra komposit saluran 4R, 5G, 7B. Proses interpretasi citra ini menggunakan unsur â unsur dasar interpretasi citra seperti warna, bentuk, tekstur, rona, pola dan bayangan ditambah dengan interpretasi geologi yang meliputi relief atau morfologi. Interpretasi litologi didapatkan litologi lava, piroklastik dan alluvium. Struktur geologi hasil interpretasi citraÂ satelit meliputi, struktur sesar, struktur runtuhan (collapse) dan kelurusan (lineament). Struktur permukaan dianalisis melalui kerapatan lineament di permukaan dengan metode FFD (Fault Fracture Density). Berdasarkan peta FFD, diketahui bahwa daerah prospek panasbumi berada di daerah Candiumbul, Kendal Duwur, Keningar, Gunung Telomoyo, Candidukuh, dan baratlaut daerah penelitian. Analisis struktur geologi dari lineament menggunakan diagram roset diketahui arah umumnya yaitu barat â laut, timurlaut-baratdaya. Berdasarkan analisis petrografi, litologi penyusun berupa lava andesit dan piroklastik.Berdasarkan survey lapangan, sistem panasbumi Gunung Telomoyo yang menjadi heat source berasal dari magma andesit â basaltik, lalu reservoir area panasbumi Gunung Telomoyo terdapat pada batuan piroklastik, dan cap rock nya yaitu lava andesit.Â

EVALUASI GROUTING PADA SECTION RETAINING WALL â B (DOWNSTREAM) DI KALI SEMARANG, KELURAHAN PANGGUNG LOR, KOTA SEMARANG, JAWA TENGAH Asbella, Khalaksita Amikani; Suprapto, Dwiyanto Joko; Fahrudin, Fahrudin; Ningtyas, Citra
Geological Engineering E-Journal Vol 6, No 1 (2014): Volume 6, Nomor 1, Tahun 2014
Publisher : Geological Engineering E-Journal

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Kali Semarang is one of the watering pattern that was in Semarang, Central Java, which runs from Pandanaran heading north toward the Java Sea. At the time of Semarang and surrounding areas have a condition that there are no rocks exposed at the surface because it is an area of older alluvium and river stage consisting of loose material such as clay, so this area has soft soil conditions until very soft. Lowering occurs in the area of construction of the embankment caused by the soft soil in the area around the construction of the embankment. Judging from the condition of the soil is soft and very soft, so we must be careful in determining the appropriate and correct methods for prevention of ground movement. Based on the soil conditions in the area of Kali Semarang, a study was undertaken using data SPT (Standard Penetration Test) to see the condition of the soil strength, and then to increase the strength of the soil used a method which is the method of grouting.From the results of drilling conducted at the Gate House point E1 +10 m, known at depth 0-2 m of sand sized loose gravel gray. At a depth of 2-20 m in the form of clay sized soft to very soft with gray. From SPT test data at Gate House point E1 +10 m, obtained N - SPT values <2 (very soft) at a depth of 2.8 to 5.8 m and a depth of 10.4 to 11.7 m. 2-3 N - SPT values (soft) is at a depth of 7.8 to 8.8 m and a depth of 13.4 to 19.3 m. SPT N - values (very dust) contained in an area close to the surface that is at a depth of 1.4 m.Once implemented method of grouting on Retaining Wall section B point 13 +1 m, +2 m point C10, and C18 +2 m point, a change in the value of the SPT test that the higher the value of N-SPT 4 (very dust) its value changed to 10 -15 (rather dense). N-SPT value of 0-1 (very soft), and the N-SPT values 2-3 (soft) turned into a N-SPT values 3-4 (soft), the value of N-SPT 5-7 (firm,) and N-SPT values 8-13 (stiff). To pile foundation bearing capacity changes from 16.57 tons to 35,98 tons to 53,03 tons. From the results of this investigation obtained good results for the purpose of grouting method successfully to increase the carrying capacity of the soil at the study site.Judging from its success with the implementation of the construction of grouting method can be resumed because the carrying capacity of the land has allowed it to withstand the load of the building to be erected.

ANALISIS FASIES BATUAN PERM-TRIAS DAN PROSPEKSI BATUAN INDUK DAN RESERVOIR DI CEKUNGAN TIMOR, NUSA TENGGARA TIMUR Prastian, Andi Heri
Geological Engineering E-Journal Vol 6, No 1 (2014): Volume 6, Nomor 1, Tahun 2014
Publisher : Geological Engineering E-Journal

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Timor Basin is one of the basin in the Eastern Indonesia wich could has a greatest hydrocarbon potential, however the geological conditions are poorly understood due to the complexity of geological condition, lack of geological and geophysical data, and overwhelming of many different geological concept. This research were conducted in the Kekneno Area, Nenas, South Central Timor, East Nusa Tenggara.The purpose of this study is to arrange a complete sequence of lithostratigraphy, analysis of depositional environment facies, macropaleontological, petrographic and organic petrology analysis. It could compare the relationship between rocks deposited in specific depositional environment with potential as a reservoir and source rock.The method of this study is done by geological field observation by measuring stratigraphic section in some geological traverses to taking the stratigraphy data in detail, and laboratory analysis as petrographic analysis, paleontology, and organic petrology.The result of the facies analysis show that Permian aged rocks deposited on the Middle Fan and Lower to Upper Slope Facies. The Triassic rocks deposited on the Outer Fan, Outer Shelf to Upper Slope, Middle Fan and Inner Fan Facies. From analysis of organic petrology, rock as a potential source rock is black shale of Niof Formation deposited on Outer Fan Facies, with high Vitrinite Maceral composition (87.1%) were included in the Gas Prone Potential category (>95%). Sandstones of Babulu and Cribas Formation from petrographic anaysis indicate poorer levels percentage of porosity is very small (<5%) were included in the classification of bad, so both of the formations are not good potential as a reservoir.

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