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Geological Engineering E-Journal Volume 1, Nomor 1, Tahun 2013
Publisher : Program Studi Teknik Geologi, Fakultas Teknik, Universitas Diponegoro

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ANALISIS SEBARAN FASIES DISCRETE ROCK TYPE (DRT), LAPISAN BASAL SAND DENGAN METODE ROCK TYPING PADA LAPANGAN MINYAK JULIE, CEKUNGAN ASRI, SUMATRA TENGGARA Julie Juwita Nahari
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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Julie Oil Field is located in the Asri Basin, Southeast Sumatra, Indonesia. The main reservoir hydrocarbon target mostly in upper part Zelda Member of Talang Akar Formation with the thickness of the layer about 53 ft, but there is a potential hydrocarbon reservoir characteristics in lower part Zelda Member of Talang Akar Formation represented by basal sand layer with the maximum thickness 26 ft. Basal sand layer is dominated of sandstone with fragments derived from igneous rock basement (granodiorite) of this basin.This study purpose to determine the distribution of Discrete Rock Type (DRT) Facies, basal sand layer are classified based on the value of DRT to facies sedimentation, which is obtained using the method of Rock Typing (Amaefule et al, 1993). The data that used for this study are wireline log, core, and seismic interpretation.Rock Typing a quantitative method of rock classification into multiple units using its petrophysical properties such as porosity, permeability and clay volume, parameter of this petrophysical properties will be used to determine the value of Reservoir Quality Index (RQI) which is equal to 0.0314√(k/????), Normalized Porosity Index (????z) which is equal to ????/(1-????), then get the value of Flow Zone Unit (FZI) which is equal to RQI/????, so that it can be determined the classification of rock as Discrete Rock Type (DRT). Based on grouping of the data on the curves cross plot between ????z VS RQI, obtained 5 grouping rock types (DRT) there are DRT 0 (FZI = <0.0508 µm), DRT 1 (FZI = 0509-1073 µm), DRT 2 (FZI = 1,156 - 1,610 µm), DRT 3 (FZI = 1.62 - 3.96 µm) and DRT 4 (FZI => 0.9 µm). Basal sand layer deposite on terrestrial depositional environment braided river system, with facies sedimentation of floodplain facies, main channel facies and channel bar facies, with direction of sedimentation trending Southeast and distribution of depositional DRT Facies trending Southwest-Northeast.

PERENCANAAN PERKUATAN LERENG PERUMAHAN CITRALAND MANADO, SULAWESI UTARA Fredy Aditya Yulianto; Dwiyanto Joko Suprapto; Prakosa Rachwibowo
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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Movement of soil often found in the State of Indonesia and is one of the natural disasters that can damage and harm humans each year. Indonesia most of the territory is hilly and mountainous, it is what makes our country vulnerable to catastrophic ground motion. This condition coupled with high rainfall as a trigger of ground motion. PT. Ciputra International is one company that is engaged in the development of housing. Housing development in the implementation problems encountered Citraland Manado local ground motion (local). Even landslides in Cluster 4 Eden Bridge damage homes and 6 people died. The cause of the avalanche is the presence of high rainfall and the presence of cracks in the rocks of the area. In anticipation of this problem, mapping and planning geotechnical slope reinforcement. Some of the data that is needed is the type of rock, heavy rock, fracture conditions, slope geometry, and rock mechanics of data. The lithology of the research sites is a tuff, sand gravel, volcanic breccias, soil embankment and sand. Based on the research generated sites prone to landslides for slope stability analysis is then performed using the software slides and phase2. The location of the Church of the Holy Kalam and Northern Hill still potentially complex landslide, being Cluster Eden Bridge is secure. At the location of the Church of the Holy Kalam, which meets the safety factor in both dry and water-saturated conditions are 1.423 and 1.349 which is a combination between the anchor and grouting grouting on the slopes and at the summit. While the location of the Northern Hill barrow, which meets the safety factor in both dry and water-saturated conditions are 1.505 and 1.494 which is the slope reinforcement using grouting.

PENGARUH STRUKTUR KEKAR TERHADAP KESTABILAN LERENG DINDING BAGIAN BARAT DAYA DAN TIMUR LAUT PADA DESAIN FASE 6 TAMBANG TERBUKA BATU HIJAU PT NEWMONT NUSA TENGGARA Yunita Sustriani
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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One of the safety factors that are important in mining (open pit mining) is a potential landslide on the slopes of the mine wall. Landslides caused by two factors, namely external and internal factors. External factors such as mining itselfis blasting, excavation, loading and material transport. While internal factors, namely the existence of geologicalstructures or areas of discontinuity in the form of joint, faults, folds, veins, the condition of the rock mass, and slopehydrology. Due to the geological structure is one of the important factors controlling the stability of the slope, then atThe studies will be discussed on the influence of geological structures is mainly joint structure. To determine the influence of joint structure on slope stability conditions used two methods of analysis methods ofkinematic and limit equilibrium analysis methods. In the kinematic analysis software used to analyze data Dips generaldirection joint, shear joint zones, veins, face slopes and friction angle. The second method is the method of limitequilibrium analysis with the help of Slide ver 5.0 software using the data in the form of rock strength and the cohesionand friction angle in the studied slope geometry. From the analysis in that the slope can be part of Southwest wedge avalanches are possible, several nondaylightingfailure avalanches both wedge and fields on the Northeastern slope. From the analysis of equilibriumanalysis on the inner walls Southwest FK impaired, when there is a joint structure FK 1,376 before getting jointstructure FK value 1,417. And on the slopes of the Northeast, FK values before exposure to joint structure is 1,432 andafter exposure dropped to 1,177 joint structure which means the slopes in landslides condition. Joint structures thatdirectly affect the stability of a slope is stocky with criteria and slope direction parallel to the face of the slope, the closerthe distance stout slopes face, the amount of joint, stocky and thick. From the analysis on the Northeast slope, slope in acritical condition that FK <1,2. It needs to be done to minimize the angle of slope face.

EKSPLORASI HIDROKARBON DENGAN METODE GEOLISTRIK KONFIGURASI SCHLUMBERGER DAN KONSEP ANISOTROPI, LAPANGAN RA, WILAYAH BENAKAT BARAT, KECAMATAN BENAKAT, KABUPATEN MUARA ENIM, SUMATERA SELATAN Rio Andryantoro; Wahju Krisna Hidajat; Dian Agus Widiarso; F.X. Yudi Triyono
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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Oil and gas energy still being a high priority industry to support economic of Indonesia, either as source of national income and supply the local energy demands. Development of oil productions decreasing year-by-year, so that, new resources and advance production need to be processed immediately. Oil and gas resources in Indonesia still have a high potential to be developed, one of the high-potential location is Sumatera Island. Tectonic processes made the Tertiary-sedimentary basins in the back of volcanics arc (back arc basin) or in the eastern of Barisan Mountains. South Sumatera Basin was one of those sedimentary basin. Research area located in West Benakat, District of Muara Enim.Among various methods of oil and gas explorations, geoelectric method was chose for th research. This method is relatively simple and inexpensive in cost. Exploration was committed with geoelectric-Schlumberger configuration. Analysis processed with anistopy concept. Area of geoelectric measurements located in RA Field, Benakat Barat Area, South Sumatera. The length was various for each line depends on total of measurement stations. The distance between each measurement station is 100 meters with measurements extend 1000 meters in length for each station. Lines which analyzed in this research were line B, D, and J with 53 measurement stations in total, 20 in line B, 17 in line D, and 16 in line J. Data calculation processed with Microsoft Excel until value of medium resistivity acquired. After that, result from calculation processes will be used for 2D modelling using Surfer 8.Based on data calculation and 2D modelling, three hydrocarbon procpect horizons have been interpreted, they are Horizon H1 in depth between 255 – 287 meters with medium resisitivity 0,87 – 6,27 Ohm meter, Horizon H2 in depth between 462 – 483 meters with medium resistivity 2,62 – 11,58 Ohm meter, and Horizon H3 in depth between 595 – 615 meters with medium resistivity 3,04 – 16 Ohm meter.

INTERPRETASI LINGKUNGAN PENGENDAPAN FORMASI TALANG AKAR BERDASARKAN DATA CUTTING DAN WIRELINE LOG PADA LAPANGAN X CEKUNGAN SUMATERA SELATAN Ivada Pratama Dewi
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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A sedimentary environment is a part of earth’s surface which is physically, chemically and biologically distinct from adjacent terrains (Selley, 1988). The study of the depositional environment is one goal of many studiesconducted for academic purpose and economically purpose in oil and gas exploration. The study of the depositionalenvironment requires a fairly comprehensive analysis as to sequencestratigraphy facies analysis to obtain detailedinterpretations or conclusions. The purpose of this study is to analyze cutting and wireline logs to determinelithology, facies and sedimentation history of theTalang Akar formation field X in South Sumatra basin. The method used to analyze the formation of depositional environment of Talang Akar field X in SouthSumatra basin is the cutting description in order to know the composition of the constituent formations. While theanalysis conducted is cutting analysis to get lithofacies interpretation, second is well log analysis method to getsubsurface data such as physical rock properties then electrofacies analysis based on gamma ray log pattern andthird is stratigraphy sequence analysis method so sea level changed can be known. Stratigraphy sequenceinterpretation did base on facies and gamma ray log pattern changed. Pratama-1 well lithology consists of shale, siltstone, very fine sandstone until medium sandstone andlimestones. While the well lithology Pratama-2 is composed of shale, very fine until medium sandstone and siltstone.Facies found in wells Pratama-1 consists of distributary channel fill, prodelta, distal bar, distributary mouth bar,and marsh. Facies in wells Pratama-2 is a mud flat and mixed flat. In Pratama-1 wells are 2 sets sequence that bounded by 2 sequence boundary, with a stratigraphic unit LST, TST and HST with progradation andretrogradation stacking patterns. While the Pratama-2 wells contained one stratigraphic unit sequence that is onlyTST in progradation and agradation stacking patterns. Based on this analysis the Talang Akar formation field X inSouth Sumatra basin has a transitional depositional environment.

PENGARUH SEEPAGE DAN KESTABILAN LERENG TERHADAP OPTIMALISASI GEOMETRI LERENG TAMBANG BUKIT M AIR LAYA BLOK TIMUR, UNIT PERTAMBANGAN TANJUNG ENIM Diana Ariana; Henarno Pudjihardjo; Fahrudin Fahrudin; Joko Tunggal
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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Kestabilan lereng merupakan salah satu hal terpenting dalam proses eksploitasi tambang batubara. Diperlukan penyelidikan geoteknik dalam perancangan desain yang aman dan efektif sehingga penambangan batubara dapat dioptimalisasikan. Daerah penelitian dilakukan pada tambang Bukit M Air Laya Blok Timur Unit Pertambangan Tanjung Enim. Lokasi tambang ini berada disebelah barat sungai, penelitian ini dimaksudkan untuk mengetahui pengaruh pola aliran dan kestabilitan lereng dalam optimalisasi geometri lereng.Metode penelitian yang digunakan adalah dengan cara melakukan interpretasi data log bor untuk mengetahui karakteristik tiap lapisan penyusun daerah tersebut meliputi data permeabilitas, kohesi, sudut geser serta bobot isi yang nantinya akan diolah menggunakan software Geoslope Seep/w dilakukan untuk mengetahui seberapa besar debit yang akan merembes dan Geoslope Slope/w dilakukan untuk mengetahui nilai faktor keamanan suatu lereng.Analisis rembesan terhadap kestabilan lereng dimodelkan dengan 2 penampang dengan jarak boundary tambang dari sungai yaitu 100m. Dua penampang memiliki elevasi tambang dibawah sungai Enim yaitu penampang C-C’ menghasilkan debit sebesar 3.186e-08 m3/s, penampang D-D’ menghasilkan debit sebesar 4.768e-08 m3/s. Analisa Slope/w dihasilkan Fk Penampang C-C’ = 1.754 (Stabil) Penampang D-D’= 2.509 (Stabil). Penampang E-E’ =2.310 (Stabil). Untuk desain pelebaran lereng /boundary tambang dilakukan pula analisa kelerengan pada lereng utara dan selatan sebanyak 3 penampang dihasilkan Fk penampang G-G’ memiliki FK 1.992 (U) dan 1.583 (S). penampang H-H’ 1.855 (S) dan penampang I-I’ 1.608 (U) dan 1.904 (S). Dari hasil kajian optimalisasi pelebaran dengan jarak 100 m dari Sungai Enim ke boundary tambang memiliki FK overall slope > 1.72 dengan pengaruh pola aliran dari sungai ke tambang maupun tambang ke sungai dikategorikan tidak terlalu besar sehingga pada daerah ini layak untuk diperlebar atau dioptimalkan.

KAJIAN KLASIFIKASI MASSA BATUAN DAN ANALISIS STEREOGRAFIS TERHADAP STABILITAS LERENG PADA OPERASI PENAMBANGAN TAMBANG BATUBARA AIR LAYA, DESA TANJUNG ENIM, KABUPATEN MUARA ENIM, SUMATERA SELATAN Dian Arfa Atmaja
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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Slope stability problems on an open pit mine is a very important issue because it involves issues of human safety, mining equipment, and other infrastructure that is located around the excavation slopes. PT. Pamapersada is a coal mining contractor company that uses open pit system. Based on experience, sometimes avalanches or cracks occur in excavated slopes. To determine the relationship between the classification of the rock mass and slope stability slope forming material is necessary to do a research on the matter. Research sites located in Tambang Air Laya pit. This is because the TAL Pit excavation area that has considerable variation in complex geological structures.Geological mapping carried out to determine the distribution of lithology and geological structures contained in the Tambang Air Laya Pit. Geotechnical mapping carried out to classify the rock mass based on Rock Mass Rating.From the field observations, the study area was divided geologically into four lithologic units, sandstone, mudstone, andesite, and coal. Based on the classification of the rock mass, the study area was divided into 4 types of rock mass: Type 1 rock mass composed of andesite with RMR value of 92 (very good rock), rock mass composed of type 2 rather weathered sandstone with RMR value of 80 (good rock), rock mass type 3 is composed of moderately weathered sandstone 50-70 RMR value (fair rock), type 4 is composed of claystone with 44-62 RMR value (fair rock). Slope stability analysis using the program Slide Ver. 5, was conducted to determine the stability of existing slopes, changes in slope geometry, and simulated slopes formed by a type of rock mass. The results of the analysis showed that the TAL Pit slope design is in a state unsafe with Fk between 1:19 - 1,248.

PEMETAAN GEOLOGI STRUKTUR UNTUK MENENTUKAN GAMBARAN TEKTONIK DAERAH KAWENGEN DAN SEKITARNYA, KECAMATAN UNGARAN TIMUR, KABUPATEN SEMARANG Christian Widiasmoro Putro
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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Research area is located on the border of two district, there are district of Semarang and Demak which includes the village of Kawengen, Penawangan, and surrounding areas, subdistrict of East Ungaran and the village of Barang, subdistrict of Mranggen. The mean of this research is to determine the tectonic overview of Kawengen and the surrounding area, in with the purpose are to find out geological structure of fold, fault, and joint that formed in research area, know the pattern of the geological structure, know the mechanism and main trend direction forming the geological structure, know the time of forming of geological structure, know the relationship between of the geological structure formed with tectonic history in research area.The collecting of data was done by mapping of semidetail geological structure and continued with processing and analyzing of data. The analysis were lineament pattern of topographic map and image of DEM analysis, stereographic analysis, and determination of relative age of rocks analysis.Litology units that forming the Kawengen area started from the youngest to the oldest are claystone interbeded sandstone unit, claystone – sandstone unit, limestone unit, carbonate sandstone unit, tufaceous sandstone unit, lava breccias unit, and volcanic breccias unit.The geological structures that formed in research area are folds, faults, and joints which the main direction are west – east, north - south, and northwest – southeast. From the stereographic analysis, main direction that form the geological structure are northwest – southeast, north – south, southwest – northeast. The making of geological structures in Kawengen were occurred in phase of inversion structure that the extension structures turned into a compression structure which resulted of the subduction of Australian plate and Eurasian plate. The geological pattern of Kawengen area are indicated as imbricate fault type which is associated with the folds (fault propagation fold). The making of the fault is also related to the establishment of strike slip fault in research area. Tectonic history in Kendeng zone started from Last Oligocene – Middle Miocene that caused the existing structure inverted. It was the result of the compression tectonic regime. This compression phase continued in the Middle Miocene – Last Miocene and last occurred in the Last Pliocene - Early Pleistocene.

ANALISIS GROUTING TEST, STUDI KASUS PERENCANAAN BANGUNAN GEDUNG PT. ASTRA OTOPARTS (PERSERO) TBK, KECAMATAN NGALIYAN, KOTA SEMARANG, JAWA TENGAH Ricky Afrianda
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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Indonesia is a country that located at the confluence of three major plates, making itprone to ground movements disaster. PT. Astra Otoparts (limited) is a company thatset up branch office in semarang and located in areas that experiencing local massmovement (local). This happens because there is a slip plane, has a lithology thatconsits of soil embankment and clay that has low value of cohesion and poorconsistency. Therefore, it should be made ground investigation to determine howmuch strength and physical condition of the soil, so as to know the proper methods toovercome these problems.The method used is grouting, but before doing grouting, grouting experiments needsto be done, ie grouting test. Grouting test is a method that used to determine theeffectiveness of the grouting to be done.Based on the analysis that has been done, we can know that the grouting method canincrease the carrying capacity of the land on the foundation of the building. After themeasurement, the value of N-spt increase from 2 up to 19 in the CH-2 and in CH-1 upto 21 in depth 4.50m to 5.00m. In the depth 9.50m to 10.00m at each check bore holethe value of N-spt from the previous 16 - 21 up to more than 60 in each hole. In thedepth 14.50m to 15.00m at each check bore hole the value of N-spt increased fromthe previous 48 - 49 up to more than 60. Efforts to increase the value of SPT withgrouting method on soil that has a low bearing capacity at PT. Astra Otopartssuccessfully performed, so that the process of building PT. Astra Otoparts canproceed.

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Kota semarang,

Jawa tengah

INDONESIA