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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 170 Documents
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PEMETAAN GEOLOGI, ALTERASI, MINERALISASI DAN KERAPATAN URAT KUARSA PADA BENCH 210 UNTUK MENGETAHUI PENGARUH KERAPATAN URAT KUARSA TERHADAP MINERALISASI DAN NILAI KADAR TEMBAGA ENDAPAN PORFIRI CU-AU BATU HIJAU, SUMBAWA, NTB Laraswati Jiwatami Dwi Kusuma
Geological Engineering E-Journal Vol 5, No 2 (2013): Volume 5, Nomor 2, Tahun 2013
Publisher : Program Studi Teknik Geologi, Fakultas Teknik, Universitas Diponegoro

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Abstract

Porphyry deposit is one of hydrothermal deposit which has potential to yield economic minerals such as gold, copper and molybdenum. Studying thegeological concept of porphyry deposit like lithology aspect, type andcharacteristic of alteration, mineralization style and vein type can laid to conceptof mineralization environmental that can generate ore. Study of mineralization inporphyry deposit also need quartz vein density analysis to determine the highgrade and low grade mineralization zone.This research is purposed to determine the distribution of lithology, zone of alteration and the relationship between quartz vein density and mineralizationin Batu Hijau Porphyry Deposit. Furthermore the result of the research can bethe consideration for geologist to mine the high grade materials.The methods that used to analyze the relationship between quartz vein density and mineralization on Bench 210 Batu Hijau Porphyry Deposit are bydoing highwall mapping on north and east side of Bench 210 open pit and logging121 geological cores which passed bench 210 (each core’s length 15 meters).From the approach above, known that lithology from old to young are Volcanic wallrock, Diorite Intrusion, Intermediate Tonalite Intrusion and YoungTonalite Intrusion. Megascopic and microscopic observation show that alterationon research area can be divided into 5 alteration zones, they are: Partial BiotitZone (potasic zone), Secondary Biotite Zone(potasic zone), Pale Green Mica Zone(argilic zone), Chlorite-Epidote Zone (philic zone) and Feldspar Destructive Zone(propilic zone). Mineralization that occurs in research area is copper-sulfidemineralization. Bornite (Cu5FeS4) and Chalcopyrite (CuFeS2) are the maincopper sulfide ore and Pyrite as gangue mineral. Quartz vein density zone onresearch area is divided to very abudant quartz vein density (10-15%), abundantquartz vein density (5-9,9%), moderate quartz vein density (3-4,9%) and rarequartz vein density (0,3-2,9%). There are positive relationship between quartzvein distribution and Cu assay content. The higher quartz vein density in Bench210 is the higher Cu assay content and generally occurs in Bornite dominatedzone. And the lower quartz vein density is the lower Cu assay content andgenerally occurs in Pyrite dominated zone.
GEOLOGI, ALTERASI HIDROTERMAL DAN MINERALISASI DAERAH CIURUG DAN SEKITARNYA, KECAMATAN NANGGUNG, KABUPATEN BOGOR, PROVINSI JAWA BARAT Mohammad Tommy Agus Binsar; Yoga Aribowo; Dian Agus Widiarso
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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Abstract

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 geological   mapping.   The   analysis   method     was     analysis    of    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 research   is  a   low   sulfidation epithermal type.
Studi Mikrofasies dan Diagenesis Batuan Karbonat Formasi Poh, Cekungan Luwuk - Banggai, Kecamatan Pagimana, Kabupaten Luwuk, Provinsi Sulawesi Tengah Wahyu Budhi Khorniawan
Geological Engineering E-Journal Vol 5, No 1 (2013): Volume 5, Nomor 1, Tahun 2013
Publisher : Program Studi Teknik Geologi, Fakultas Teknik, Universitas Diponegoro

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Abstract

Formasi  Poh  merupakan  salah  satu  Formasi  yang  diendapkan  pada  zaman  tersier  dalam cekungan Luwuk – Banggai, Sulawesi Tengah. Cekungan ini sangat menarik karena semua batuan dari yang berumur pra tersier hingga sekarang ini dapat tersingkap di lapangan. Formasi Poh mempunyai susunan litogi berupa batugamping dengan sisipan batulanau karbonatan. Penelitian ini bertujuan untuk menentukan mikrofasies dan lingkungan pengendapan batuan karbonat, mengetahui proses diagenesis yang berkembang serta lingkungan diagenesis batuan karbonat, menentukan umur relatif berdasarkan kelimpahan foraminifera besar   pada batuan, dan yang terakhir menentukan dinamika sikuenstratigrafi berdasarkan data mikrofasies yang terdiri dari data petrografi dan paleontologi yang teramati. Metodologi yang digunakan dalam penelitian adalah metode deskriptif dan metode analisis. Metode deskriptif yang dilakukan menguji hipotesis, membuat prediksi serta mendapatkan manfaat dari suatu masalah yang ingin dipecahkan, sedangkan untuk metode analisis yang digunakan  adalah  analisis  petrografi,  analisis  mikrofasies,  analisis  foraminifera  besar  dan analisis sikuenstratigrafi. Analisis mikrofasies dilakukan untuk menginterpretasi fasies, lingkungan pengendapan, tipe platform, proses dan lingkungan diagenesis, sedangkan analisis foraminifera  besar  diperlukan  untuk  menentukan  umur  batuan.  Berdasarkan  hasil  analisis tersebut dibuatlah kolom zonasi fasies yang disusun secara vertikal untuk memudahkan pendeteksian stacking pattern dari sebuah parasequence set. Dari hasil pengamatan sayatan tipis didapatkan 13 tipe dari batuan karbonat berdasarkan klasifikasi Dunham (1962), yang dimodifikasi Flugel (2010) , yaitu: Bioclast Large Foram Packstone, Bioclast Plangtonik Forams Packstone, Bioclast Plangtonik Forams Packstone with Quartz, Bioclast Red Algae Wackstone, Bioclast Red Algae Grainstone, Packstone with Dolomitation, Ooid Grainstone, Ooid Packstone, Bioclast Coral Rudstone, Bioclast Milliolids Grainstone, Bioclast Plangtonik Forams Packstone with Microspar, Interdeterminate Bioclast Packstone, dan Bioclast Red Algae Packstone with Microspar. Ke tigabelas tipe batuan tersebut tersebar kedalam 6 zonasi fasies Wilson (1975), yakni FZ 1 Deep Sea, FZ 3 Toe-Of-Slope Apron (Deep Shelf Margin), FZ 4 slope, FZ 5 Platform-Margin Reefs, FZ 7 Open Marine, dan FZ 8 Platform Interior – Restricted. Lingkungan pengendapan dari singkapan batuan karbonat ini adalah shallow marine shelf  dengan bentuk platform berupa rimmed carbonate.  Proses diagenesis yang berkembang diantaranya semen isopach yang menandai lingkungan marine phreatic, terbentuknya circumgranular cement yang menandai lingkungan meteoric phreatic, serta pertumbuhan mineral equant calcite, deformasi butiran, dan neomorfisme yang menandai lingkungan burial. Umur relatif singkapan menunjukkan kisaran umur P21 sampai N11 yaitu Oligosen  Akhir    -  Miosen  Tengah.  Data  yang  terkumpul  dari  analisis  sayatan  ini  dapat digunakan untuk mengidentifikasi sikuen pada batas parasequence set yang menunjukkan agradasi dan retrogradasi stacking pattern, dari sebuah system tracts yang diperkirakan sebagai transgressive system tracts dan highstand system tracts.
GEOLOGI DAN ALTERASI HIDROTERMAL DAERAH BANTAR KARET DAN SEKITARNYA, KECAMATAN NANGGUNG, KABUPATEN BOGOR, PROVINSI JAWA BARAT Rizal Dwi Febriyana; Yoga Aribowo; Dian Agus Widiarso
Geological Engineering E-Journal Vol 6, No 1 (2014): Volume 6, Nomor 1, Tahun 2014
Publisher : Program Studi Teknik Geologi, Fakultas Teknik, Universitas Diponegoro

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Abstract

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 ± Smectite Alteration Zone (Propylitic), Smectite Alteration Zone - Kaolinite ± 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.
PEMODELAN PEMASANGAN PENYANGGA SEMENTARA MENGGUNAKAN PERANGKAT LUNAK PHASE 2 PADA HEADRACE TUNNEL CHAINAGE 155 M – 265 M DI PLTA TULIS KABUPATEN BANJARNEGARA, JAWA TENGAH Muhammad Rais Fathoni
Geological Engineering E-Journal Vol 5, No 1 (2013): Volume 5, Nomor 1, Tahun 2013
Publisher : Program Studi Teknik Geologi, Fakultas Teknik, Universitas Diponegoro

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Abstract

The tunnel is a copy below the ground or mountains. The tunnel was built aims to ensure a continuity of a system in theform of the transfer or objects from one place to another. Tulis Hydro Power Station is located in the Village Sokaraja,District Pagentan, Banjarnegara regency, Central Java. In the construction of Tulis Hydropower, made headrace tunnelthat serves as a time tunnel leading Merawu upstream dam plan Maung. In the construction of the tunnel, it is necessary as an alternative modeling in analysis and evaluation. Finite elementmethod is a numerical solution method, which in geomechanics used to determine the stress field and the displacementof rock mass modulus of elasticity or deformation if known by the behavior of the rock mass deformation is applied.Phase software program is a program designed for the purpose 2D finite element analysis of the process of excavation.Rock mass displacement in the tunnel was calculated using a software program Phase2. Meanwhile, as a supporter ofthe parameter values used to obtain the required form Roclab software. The parameters used in the calculation includethe tunnel geometry, boundary conditions, the main stress on the tunnel, geological conditions, the material around thetunnel, physical and mechanical properties of rocks, rock strength parameters that include the type material and thefailure criteria, the installation of a tunnel support along the physical and mechanical properties of the tunnel support . Tunnel support systems were installed in the tunnel includes rockbolt, wire mesh and steel support. While theinstallation of a tunnel support modeling used in the form rockbolt, shotcrete and liner. Determination of a tunnelsupport combinations based on the values and classes that are the result RMR rock mass classification. Simulation results show the total displacement of the excavation to be done after the installation of the a tunnel supportis as follows: 1. Simulation results chainage 198 m to the rock mass class IIIb, elastic material types for m 0.0117161 - 0.0113736 m2. Simulation results chainage 205 m to the rock mass class IIIa, elastic material types for m 0.0122892 - 0.0119034 m3. Simulation results chainage 230 m to the rock mass class IIa, elastic material types for m 0.0119481 - 0.0116411 m4. Simulation results chainage 250 m to the rock mass class IIb, elastic material types for m 0.0103595 - 0.0100815 mBased on the fourth simulation results show the number of damaged elements ranging from 8 to 23 damaged elements. The simulation results based on the finite element indicates stability can be said to be stable tunnel.
GEOLOGI, KARAKTERISTIK DAN GENESA ENDAPAN LATERIT BAUKSIT PT. ANTAM (Persero) Tbk, UNIT GEOMIN, DAERAH KENCO, KABUPATEN LANDAK, PROVINSI KALIMANTAN BARAT Fachrul Rozi Ramadhan; Yoga Aribowo; Dian Agus Widiarso; Betraz A
Geological Engineering E-Journal Vol 6, No 1 (2014): Volume 6, Nomor 1, Tahun 2014
Publisher : Program Studi Teknik Geologi, Fakultas Teknik, Universitas Diponegoro

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Abstract

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.         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.         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 ±33%, Iron (II) trihydrate (Fe2O3) of about ±8.5%, Silicate oxide (SiO2) approximately ± 43%, Titanium oxide (TiO2) approximately ≤1% and total silicate (R-SiO2) approximately ≤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 Reza Permadi; Prakosa Rachwibowo; Wahju Krisna Hidajat
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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Abstract

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.  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.  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.
PEMETAAN BAWAH PERMUKAAN DAN ANALISIS PERSEBARAN RESERVOIR PADA FORMASI TALANGAKAR AREA LAPANGAN RARASWARI CEKUNGAN JAWA BARAT UTARA. STUDI KASUS : BATUPASIR TAF-3 OLIGOSEN AKHIR Dhimas Aditya Nugraha
Geological Engineering E-Journal Vol 5, No 1 (2013): Volume 5, Nomor 1, Tahun 2013
Publisher : Program Studi Teknik Geologi, Fakultas Teknik, Universitas Diponegoro

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Abstract

Oil and gas industry in Indonesia still plays an important role in supporting the country's development program. Therefore, it is still necessary oil and gas production continuously. Special studies that will provide more detail kostribution in the development of  an oil and gas field. Research areas of oil field development studies lies in the reservoir silisiklastik sediment, Talangakar Formation, North West Java Basin.Purpose of this research, among others, identify formations characteristics, identify depositional environment, facies, and petroleum system of Raraswari field, identify conditions and distribution of reservoir based on log corelation and subsurface map, know the value of the potential reserves and give location of new development well at Raraswari field. The method that is used in this research are descriptive and analysis method. Researcher did log analysis, seismic analysis, and subsurface map analysis. Software that is used to support this research are Geoframe, Geolog, Seisearth XV, and Geodepth.Based on log analysis, lithology which being reservoir is sandstone TAF-3 Late Oligocene and has shale volume 23%, porosity 11.9%, and water saturation 26%. Based on elektrofacies analysis,  sandstone TAF-3 identified as distributary channel facies and deposited in the delta plain environment. Based on subsurface map analysis, sandstone TAF-3 deposited in lower surface, in the midle to northwest area of Raraswari Field. Generation occurs in the Talangakar Formation. Source rock are shale with organic rich and coal streak. Hidrocarbon’s migration has lateral direction from north to the south and trapped by structural and stratigraphy trap. Structural trap formed by normal fault and seal rock lithology is shale. Based on volumetric calculation, potential reserves is known for 2,272,935.983 STB and location of development well on the coordinates x = 107 ° 56 'xx.xx "E, y = 6 ° 17' xx.xx" in depth 2800 m to 2820 m. 
HUBUNGAN KONDISI GEOLOGI TERHADAP ALTERASI HIDROTERMAL DAN MINERALISASI PADA ENDAPAN EPITERMAL DAERAH BUNIKASIH, KECAMATAN TALEGONG, KABUPATEN GARUT, PROVINSI JAWA BARAT Saumi Rahmawati; Hadi Nugroho; Dian Agus Widiarso; Okky Verdiansyah
Geological Engineering E-Journal Vol 5, No 2 (2013): Volume 5, Nomor 2, Tahun 2013
Publisher : Program Studi Teknik Geologi, Fakultas Teknik, Universitas Diponegoro

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Abstract

Hydrothermal alteration is a changed in the mineral composition of the rock as a result of interaction of hydrothermal fluids with the wall rock involving various geological environments like fault zones and volcanic eruptions zones. Hydrothermal alteration has a very close relationship with the mineralization. Mineralization is a process of inclusion of valuable rare minerals in rocks that form ore deposits. The purpose of this study is to determine the geological conditions of the mapping area and knowing the type of alteration and the relationship between alteration with the developing of ore mineralization. Research methods include field observations survey and continued by analysis methods, conducted in Bunikasih and surrounding areas, Talegong District, Garut regency, West Java. Methods of analysis undertaken include petrology, petrography, Terraspec, and structure analysis. Geological conditions of the study area consists geomorphological unit of structural steep hills and undulating hills of volcanic units (Van Zuidam, 1983). The research area is composed by rocks from old to young volcanic breccia, Andesite Lava, and tuff. Geological structures that are left slip fault of North Cibaliung, right slip thrust fault of South Cibaliung, right slip normal fault of Citutugan-Cibaliung Beet. There are prophylitic alteration (smectite, chlorite, ±illite), argillic (kaolinite, illite, smectite), advanced argillic (kaolinite, illite, alunite, silica), and silicification (vein zone). In the study area there are two types of epithermal, low sulfidation epithermal zone on Bunikasih mineralized was found that quartz manganese vein, chalcedonic vein, crustiform-colloform banded vein, and disseminated pyrite. there are 5 main vein lines with 40-100cm of thickness with a northwest-southeast direction formed on andesite and tuff, due to the style of the extensions that form the structure openings fault trending Northwest-Southeast. At high sulphidation epithermal indication zone in Datarkorot is dominated by advanced argillic alteration. Mineralization occurred is in the disseminated pyrite form and the concentrated hematite oxide mineral, goethite, and jarosite is a condition of changing sulfide mineral acids. Mineralization is controlled by lithology, by tuff unit which is interpreted lithocap of a diaterme breccia generated by a dacite porphyry intrusion.
ANALISIS SIKUEN STRATIGRAFI DAN PEMODELAN FASIES FORMASI TANJUNG BERDASARKAN DATA LOG SUMUR DAN DATA INTI BATUAN PADA LAPANGAN MIR CEKUNGAN BARITO, KALIMANTAN SELATAN Muhammad Ilham Ridwan; Hadi Nugroho; Yoga Aribowo; Mill Sartika Indah; Perdana Rakhmana Putra
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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Abstract

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 – 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.

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