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Geological Engineering E-Journal
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Earth & Planetary Sciences
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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IDENTIFIKASI PENYEBAB GERAKANTANAH DENGAN PENYELIDIKAN GEOLOGI TEKNIK DAN PENGUKURAN GEOLISTRIK METODE WENNER PADA PERUMAHAN TAMAN SENTOSA DAN SEKITARNYA KELURAHAN SUKOREJO KECAMATAN GUNUNG PATI KOTA SEMARANG Fachry Afif Fauzan; 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

Salah satu permasalahan yang terjadi di Perumahan Taman Sentosa,Kecamatan Gunung Pati, Kota Semarang dan sekitarnya adalah gerakantanahyang terjadi pada lokasi tersebut yang menjadi lokasi penelitian. Kejadiangerakantanah yang terjadi cukup mengganggu aktifitas masyarakat dan merusakinfrastruktur bangunan serta jalan yang ada. Penyebab dan klasifikasigerakantanah tersebut perlu diketahui secara baik sehingga dapat dilakukanpenanggulangan gerakantanah yang tepat terhadap lokasi penelitian. Tujuan daripenelitian ini adalah menentukan litologi lokasi penelitian, klasifikasigerakantanah, dan penyebab gerakantanah yang terjadi berdasarkan analisispengukuran geolistrik metode Wenner dan pemetaan geologi teknik. Geolistrik merupakan metode geofisika yang digunakan untuk mengetahuikondisi geologi bawah permukaan berdasarkan variasi nilai resistivitas jenisbatuannya. Metode yang digunakan pada penelitian ini adalah geolistrik metodeWenner, dengan 4 titik pengukuran geolistrik yang tersebar di sekitar lokasipenelitian. Proses pengolahan data dilakukan menggunakan software IPI2winuntuk mengetahui nilai resistivitas batuan. Sedangkan pemetaan geologi teknikadalah penyelidikan material permukaan menggunakan peta kontur denganmemperhatikan sifat geologi teknik material dengan hasil akhir berupa petageologi teknik. Hasil interpretasi litologi berdasarkan nilai resistivitas batuan, dapatdikelompokkan menjadi batulempung (< 10 Ωm) dan batupasir (10-100 Ωm) dantidak ditemukan adanya ketidakmenerusan litologi yang menjadi pencirikeberadaan struktur geologi. Sedangkan hasil penyelidikan geologi teknikpermukaan ditemukan pada lokasi penelitian batulempung sisipan batupasir danlempung kepasiran dan tidak ditemukan adanya struktur geologi. Batulempungsisipan batupasir 75% komposisinya memiliki ukuran butir 0,06 mm dan 25%dibawah 0,02 mm. Sedangkan lempung kepasiran terdiri dari 90% komposisilempung dengan ukuran butir dibawah 0,02 mm dan 10% pasir dengan ukuranbutir 0,06 mm.Setelah dilakukan analisis terhadap data-data geolistrik dan geologi teknik yang didapat diketahui bahwa jenis gerakantanah yang terjadi pada lokasipenelitian adalah rayapan (creep) yang disebabkan oleh keberadaan materiallempung pada lokasi penelitian. 
Eksplorasi batubara Bambang Pranowo
Geological Engineering E-Journal Volume 1, Nomor 1, Tahun 2013
Publisher : Program Studi Teknik Geologi, Fakultas Teknik, Universitas Diponegoro

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Abstract

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ANALISIS PENGINDERAAN JAUH UNTUK MENENTUKAN DAERAH BAHAYA DALAM RANGKA MENDUKUNG UPAYA MITIGASI BENCANA GUNUNGAPI DENGAN MENGGUNAKAN CITRA DEM DAN LANDSAT DAERAH GUNUNG BATUR KABUPATEN BANGLI PROVINSI BALI Imron Bashori
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

Indonesia merupakan negara dengan jumlah penyebaran gunung berapi yang sangat banyak,mengingat letaknya berada pada jalur cincin api (ring of fire). Salah satunya adalah GunungBatur. Dalam peraturan Menteri ESDM, Gunung Batur yang letaknya secara geografis padaKabupaten Bangli terletak pada posisi 8°11′ – 8°18’ LS dan 115°18′ – 115°27′ BT, menempatiposisi 20 dalam indeks rawan bencana letusan gunungapi.Penelitian ini bertujuan untuk melakukan prores upaya mitigasi bencana gunungapi denganmenentukan kawasan rawan bencana dan hubungannya dengan penggunaan lahan kawasanGunung Batur.Analisis klasifikasi bentuklahan dan penutup lahan dengan menggunakan metode penginderaanjauh secara visual. Hasil analisis bentuklahan citra DEM dibagi kedalam tujuhbelas bentuklahan(landform), yaitu: bentuklahan asal laut dan pantai disimbolkan dengan M yaitu Dataran PasangSurut (M4) dengan luas wilayah 2993 Ha, bentuklahan struktural sebanyak 3 disimbolkan denganhuruf (S) meliputi : Perbukitan Bergelombang Terlipat Kuat (S1), Perbukitan Blok Sesar (S3),Dataran Bergelombang Terlipat Lemah (S4), dengan luas wilayah 13319 Ha dan bentuklahanvulkanik dengan huruf (V) sebanyak 13 unit meliputi: Lubang Kepundan (V1), Lereng GunungApi (V5), Medan Lava (V6), Dataran Fluvio Vulkanik Berbukit Datar (V9), Dataran FluvioVulkanik Berombak (V10), Dataran Fluvio Vulkanik Berbukit Rendah (V11), Kipas FluvioVulkanik (V12), Tebing Kaldera (V14), Danau Kaldera (V15), Bukit Parasiter Vulkanik (V17),Kerucut Vulkanik (V26), Kerucut Parasiter (V27), Dataran Kaldera (V28), dengan total luaswilayah 65078 Ha. Hasil analisis penggunaan lahan yang didapatkan pada penelitian ini meliputi8 kelas, antara lain (1) Perairan 1673,341 Ha; (2) Hutan 30201,388 Ha; (3) Lahan Terbuka9455,038 Ha; (4) Padang Pasir 1921,216 Ha; (5) Kawah 66,639 Ha; (6) Permukiman 13584,021Ha; (7) Pertanian 25863,64 Ha dan (8) Aliran Sungai 2255,475 Ha. masing – masing klasifikasidilakukan penilaian (skoring) yang kemudian dilakukan overlay sehingga menghasilkanhubungan penggunaan lahan terhadap kawasan rawan bencana.Hasil skoring penggunaanlahan dan kawasan rawan bencana menghasilkan tiga daerah bahayagunungapi yaitu: kawasan rawan bencana tinggi (11914 Ha), kawasan rawan bencana sedang(18944 Ha) dan kawasan rawan bencana rendah (53384 Ha). 
GEOLOGI, ALTERASI HIDROTERMAL, DAN MINERALISASI DAERAH ONTO DAN SEKITARNYA, KECAMATAN HU’U, KABUPATEN DOMPU, PROVINSI NUSA TENGGARA BARAT Alif Febriansyah; 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 use of metallic minerals as raw materials is increasing. Therefore, Indonesia needs to improve metallic mineral reserves for the needs of the country and internationally to explore maximally. This can be done because some parts of Indonesia has huge reserves of metallic minerals.. This research purposed to learn about geological condition of research area involve morphology, lithology, and structure geology, determine alteration zone, and learn distribution of Copper (Cu) that contained in research area.Methodology used in this research is survey method and analysis method. Survey methos by doing surface geological mapping. Analytical method by doing petrology analyisis, petrography analysis, mineragraphy analysis, ASD analysis (Analytical Spectral Device) and sturcture geology analysis.Geomorphology of Onto and the surrounding divided into two units are volcanic very steep hill unit and volcanic steep hill unit. Lithology of research area from older  to younger are tuff, volcanic breccia and breached by porphyrytic andesite. Structure geology in research area in the form of alignment pattern by Dem Map (Digital Elevation Model) in period I direction of structure is west-east and northwest-southeast, whereas in period III direction is north-south. The alteration zone of research area are divided into advanced argillic zone associated with dickite, alunite, and kaolinite minerals; argllic zone associated with kaolinite, palygorskite, and siderite minerals; and intermediet argillic associated with palygorskite and Chlorite minerals. Mineralization of research area is in the form of stockwork and disseminated whick mineralized by pyrite and chalcopyrite as ore mineral. Type of mineralization deposition in research area is Porphyry depoosition type. The value levels of Copper in research area are potential with 1132,79 ppm in tuff unit STA. 33, STA. 35 with value levels of copper is 130,01 ppm, STA. 55 is 390,37 ppm, STA. 56 is 499,9 ppm and STA. 73 is 288,95 ppm.
IDENTIFIKASI STRUKTUR GEOLOGI DENGAN GEOLISTRIK METODE SCHLUMBERGER STUDI KASUS SEBAGIAN SISI UTARA KAMPUS UNIVERSITAS DIPONEGORO TEMBALANG Sigit Prasetyo
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

Geoelectric (resistivity) is a geophysical method used to determine the condition or the subsurface geological structures based on the variation of the resistivity rock. What the research lies in the northern part UNDIP Tembalang campus, located on Kaligetas Formation (Qpkg) lithological units composed of volcanic breccia, lava flows, tuffs, tuffaceous sandstone and mudstone. At the study site found the scarp and alignment springs. The condition is likely due to the influence of geological structures formed. The purpose of this study was to determine the subsurface lithology types and  kinds of geological structures based on the measurement results Schlumberger geoelectric method.The method used in this study is geoelectric schlumberger method. Geoelectric measurements carried out by 16 points spread among the sites. Geoelectric data processing to determine the actual value of resistivity and thickness of each layer using software IPI2win.Based on the results of data processing geoelectric resistivity values obtained in the study area in the form of rock mudstone (≤ 15 Ωm), sandy mudstone (16-45 Ωm), sandstones (46-100 Ωm), and volcanic breccia (> 100 Ωm). The results of the resistivity values and correlated geoelectric section is to analyze the structural phenomenon which occurs in the study area. In correlation A - A '(UNDIP 3, UNDIP 13, and UNDIP 15) mudstone layer located at a depth of 55 meters in cross UNDIP 3, has increased to lie at a depth of 9 meters in cross section UNDIP UNDIP 13 and 15. In correlation C - C '(UNDIP 4, UNDIP 2, and UNDIP 16) mudstone layer located at a depth of 62 meters in cross UNDIP 4, has increased to lie at a depth of 11 meters in cross UNDIP 2 and located at a depth of 2.4 meters in cross UNDIP 16. From the results of which showed increased geoelectric mudstone layer, it can be analyzed that the geological structure in the area of research in the form of faults (fault), the type of reverse faults, the south is part of a down (foot wall), while the northern part is relatively rise blocks ( hanging wall). With the direction of fault trending northwest - southeast
PENENTUAN ZONA PROSPEK HIDROKARBON PADA FRACTURED BASEMENT BERDASARKAN DATA WELL LOG DAN SEISMIK 3D PADA LAPANGAN MALAWAPATI SUB-CEKUNGAN JAMBI, CEKUNGAN SUMATERA SELATAN Rahman Wahyudianto; Hadi Nugroho; Yoga Aribowo; Robet Wahyu Widodo
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

Hydrocarbon discovery in the basement of several exploration wells in South Sumatra Basin, giving new challenges for geologists to find hydrocarbon reserves with the concept of new thinking, the best one on the concept of the geology and oil exploration in fractured basement.Research object is on the basement high, which dominant lithology is schist. This research is located at Malawapati and includes part of the Sub-Basin of Jambi, South Sumatra Basin. Based on Drill Stem Test (DST), hydrocarbon potential of fractured basement on Prabu X1 is around 0.2-1 MMSCFGPD (Million Standard Cubic Feet Gas Per Day) and on Dharma X3 is around traces-1 MMSCFGPD, then it needs a good study to determine hydrocarbon potential in the fractured basement.The purpose of this research is obtaining a description of the basement characteristic and vertical fracture intensity in the basement by using well log and master log, obtaining horizontal fracture distribution in the basement by using 3D seismic and seismic attributes, obtaining a description of the basement geometry by analyzing geological structures in the basement, determining correlation of the two data are intensity and distribution of fracture to determine the location of the most prospect as a hydrocarbon zone.The research method is using descriptive and analytical methods. There are 3 wells in Malawapati field. There are 2 wells which reaching the basement, which are Prabu X1 and Dharma X3 and also a well not reaching the basement, which is Dharma X3. Well log and master log is used to determine basement characteristics and vertical fracture intensity with Fuzzy Inference System (FIS), it is used for reference in retraction the target zone on seismic attribute by type variance cube, which the suitable are 70 ms below the horizon of Prabu X1 and 25 ms below the horizon of the well Dharma X3. 3D seismic data is used to determine basement geometry and horizontal fracture distribution with seismic attribute by type variance cube.Based on the correlation analysis of well log, master log and seismic attribute by type variance cube, is known that hydrocarbon prospect zone in vertical is weathered basement zone and high intensity zone. Hydrocarbon prospect zone in horizontal is zone A which is the top of basement high zone and also not affected by zone fault so it has low fracture intensity. Zone B is edge of the basement high zone and also affected by zone fault so it has high fracture intensity
STUDI STRATIGRAFI DAN PALEOGEOGRAFI ENDAPAN KENOZOIKUM CEKUNGAN SENGKANG PADA DAERAH KABUPATEN MAROS, PROVINSI SULAWESI SELATAN Hendry Tri Pradipta Putra; Hadi Nugroho; Yoga Aribowo; Danny Irawan
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

Stratigraphy and paleogeography study basin sengkang never discussed in detail by earlier researcher, caused by pattern sequence stratigraphy this basin is difficult is determined disturbed consequence by activity tektonic mobile in Paleogen and Neogen. The mentioned that make as object that interesting to studied and studied furthermore.Watchfulness method is done with research method, descriptive method, and analysis method. Research method is done with direct quest at field, this descriptive method is done with describe field data and laboratory data, and analysis method is done with analyze litostratigraphy, biostratigraphy, sequence stratigraphy, and tektonostratigraphy the result is used for discussion syntheses paleogeography watchfulness region.Litostratigraphy watchfulness region is divided to be four rock formations with sequence the position from old to young, that is Mallawa Formation aged Middle Eocene, Tonasa Formation aged Early Miocene, Camba Formation with age turn Late Miocene, and Walanae Formation with age turn Pliocene. From formation, knowable ten species foraminifera planktonic as age areas biostratigraphy, that is Globigerapsis index as datum age zone P.11, Globigerina yeguaensis as datum age zone P.12, Orbulinoides beckmanni as datum age zone P.13, Globigerinoides immaturus as datum age zone N.4, Globoquadrina dehiscens as datum age zone N.5, Orbulina bilobata as datum age zone N.6, Globigerinoides diminutus as datum age zone N.7, Praeorbulina glomerosa as datum age zone N.8, Globigerinoides conglobatus as datum age zone N.18, and Globorotalia crassaformis as datum age zone N.19. Sequence stratigraphy watchfulness region consists of three sequence precipitation that consist of three packages system tract complete, that is highstand system tract, transgressive system tract, and lowstand system tract. Tektonostratigraphy sediment Kenozoikum watchfulness region, got four sequence, that is syn-rift, sag-basin, syn-orogenic, and post-orogenic. History paleogeography watchfulness region since Middle Eocene still environment land-deltaic with precipate formation unit mallawa, then in miosen beginning happen phase transgresi with precipate Mallawa Formation, and Late Miocene to happen regression phase with precipate Camba Formation, and phase transgresi return to happen by the end of Pliocene beginning with precipate Walanae Formation.
DELINIASI SEBARAN NILAI PERMEABILITAS SEKUNDER UNTUK MEMPERKIRAKAN POTENSI ALIRAN AIRTANAH PADA TAMBANG BAWAH TANAH KUBANG CICAU PT. ANEKA TAMBANG TBK LOKASI RAMP DOWN, PONGKOR, KABUPATEN BOGOR, JAWA BARAT Dhony Indrawan; Henarno Pudjihardjo; Wahju Krisna Hidajat; Yosep Purnama
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

Tunnel development on UBPE Pongkor is an ongoing and continuous work to take existing gold reserves in gold mining Pongkor site. One of the development work is making the access to the location of ore mining process to be carried out, one of the existing ore is the Kubang Cicau location . However, the process of mining and development plans on the location of the tunnel ramp down Kubang Cicau disorder caused the groundwater flow resulting in ponding of water is high enough on the location of the south ramp down Kubang Cicau so need to do the research include hydrogeological studies on secondary permeability values that exist in study siteThe research carried out by the method of observation on the location of the ramp down Kubang Cicau include calculation of fracture parameters for the calculation of the value of secondary permeability Snow equation ( 1968 ) as well as observations of the condition of the ramp down Kubang Cicau especially the condition of water flowing through the tunnel wall. Secondary permeability values at study sites will affect the flow of groundwater potential zones and take effect on groundwater flow patterns.The study was conducted at the location of the ramp down and ramp up Kubang Cicau at an elevation of 450-500 meters above sea level . Based on the analysis it was found that the flow of groundwater in the study site predominantly influenced by secondary permeability is influenced by the media cracks in the rocks . In the research area known secondary permeability values at locations greater than the ramp down ramp up locations , with most of the secondary permeability value of 3.17 10-2 m/s were found in the location of the point is in south ramp down Kubang Cicau mine . Based on the distribution of secondary permeability values can be concluded that the potential for groundwater flow is in the southern part of the ramp down and ramp down groundwater flow toward the south .
MIKROFASIES BATUGAMPING FORMASI BULU DAN KUALITAS BAHAN BAKU SEMEN, PADA LAPANGAN GUNUNG “PAYUNG”, KECAMATAN BOGOREJO, KABUPATEN BLORA JAWA TENGAH Ajidityo Putro Fadhlillah; 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

Bulu Formation is one of formation which is sedimented at Tertiary age in The North East Java Basin. Bulu Formation has a lithological composition of limestones with kalkarenit. Bulu Formation is located in Gandu village, Tahunan Village, and the surrounding areas, District Bogorejo, Blora, Central Java, with a particular study on the "Gunung Payung".The study aimed to determine microfasies, facies zone, the relative age, and standart of quality limestone as materials cement on data petrographic, paleontologist, and chemical analysis of limestone samples in the study area. Development of Limestone Bulu Formation Unit microfacies is Bioclast Red Algae Packstone, Bioclast Large Foram Grainstone, Bioclast Large Foram Packstone, Bioclast Planktonic Foram Packstone, Bioclast Grainstone with dolomitation, Planktonic Forams Grainstone, Planktonic Wackstone, Peloidal Wackestone, Packstone with dolomitation, Bioclast Wackstone with microspar, Bioclast Planktonic Foram Wackstone, Bioclast Wackstone with dolomitation, Bioclast Packstone with dolomitation, and Dolomite limestone.Based on the analysis microfacies and foraminifera on the areas of research, there are 3 types of facies zoning based on the model of Wilson (1975), namely: FZ 5 Platform - Margin Reefs, Marine Open 7 FZ, FZ 8 Platform and Interior - Restricted to the age of rocks between N9 to N12 is the Middle Miocene. From the chemical analysis, the potential limestones in the study area can be used as raw material for cement and relationships microfacies analysis and chemical analysis showed that the pitch "Gunung Payung" has a great potential in terms of good quality which is spread of West to East direction. The west area of “Gunung Payung” has better quality of limestone as a raw material for cement than east area.
Analisis Kestabilan Lereng pada Perencanaan Pembangunan Tanggul Kali Semarang, Jawa Tengah Bayu Arga Pradana
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

Indonesia is a mostly country who have a mass movement disasters. These disasters are common in many areas, especially during the rainy season. This study aims to determine the safety factor of the slope value at the location so it can be seen from geotechnical reconstruction methods necessary for planning the construction of the embankment will be done on one time, Semarang.The research method used is descriptive and experimental methods. Slope stability analyzes performed using computational methods using software GeoStudio 2007, which then conducted an experimental method to simulate the value of cohesion on improving safety factor (Fs).From field observations and analytical results, the type of ground motion that can occur in the form of research creep, which is triggered by the huge burden of the activities of the local community and the load of the Kali Semarang have a large discharge and high during the rainy season.Based on the analysis of slope stability, slope conditions has a value of 0.809 with a safety factor of cohesion to the clayley sand layer 5.89 kPa and 8.92 kPa in clay layer. The simulation results obtained are a great value for the safety factor (Fs) 1.786 where the results are worth the value of cohesion at 15.89 kPa clayley sand and the clay has a cohesion value of 18.92 kPa, indicating that the slope is said to be secure and stable against mass movement must have increased the value of ± 10 kPa cohesion. Grouting method is an effective method to increase the value of cohesion in the rock form’s.In planning the embankment to be performed on site execution of the research required cutting slopes up to ± 90 °, the situation is then carried out two ground reinforcement methods that do the grouting method to increase the value of cohesion so that the constituent rocks have a high carrying capacity, and the execution of the sheetpile installation method will make retaining wall at the edge of the Kali Semarang make it strong andout construction of safe and effective.

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