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ANALISIS SENSITIVITAS PEMODELAN ANALOG SANDBOX UNTUK MENGETAHUI PERKEMBANGAN STRUKTUR SESAR NAIK Dimas Asmarakandy; Dwiyanto Joko Suprapto; Fahrudin Fahrudin
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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Pemodelan sandbox adalah salah satu jenis pemodelan analog dalam ilmu geologi yang memiliki tujuan utama yaitu simulasi gaya, deformasi dan evolusi struktur cekungan sedimen. Terbentuknya struktur geologi berupa sesar naik (thrust atau backthrust fault) diakibatkan oleh sistem tektonik konvergen dan dapat dimodelkan dengan pemodelan sandbox. Penelitian ini bertujuan untuk memahami mekanisme dan sekuen deformasi dari sistem sesar naik dengan mengetahui hasil deformasi yang berupa pola struktur geologi; mempelajari perkembangan morfologi, pola dan distribusi struktur pada sistem tektonik konvergen; mengetahui variabel pengujian dalam pembentukan deformasi pada pemodelan sandbox. Penelitian dilakukan dari tahap persiapan hingga pelaksanaan. Persiapan yang dilakukan adalah pewarnaan, pengeringan dan pengayakan bahan model yaitu pasir kuarsa Formasi Ngrayong dengan dua macam ukuran butir; kategori ukuran pasir kasar (30-50 mesh) dan kategori ukuran pasir halus (60-80 mesh). Selanjutnya melakukan uji konsistensi alat sandbox. Hingga terakhir menentukan kondisi batas pemodelan seperti ukuran butir, ketebalan dan basement. Pada tahap pelaksanaan, data yang dihasilkan yaitu; foto/ gambar hasil pemodelan, waktu pergerakan dan jumlah sesar yang terbentuk, jarak pemendekan dan perubahan dip sesar, serta perkembangan morfologinya. Struktur yang terbentuk yaitu thrust dan backthrust fault. Morfologi yang terbentuk merupakan sabuk sesar thrust yang perkembangannya ditandai oleh terbentuknya struktur-struktur sesar baru. Jumlah sesar bertambah dan sudut kemiringan sesar pun cenderung bertambah seiring dengan meningkatnya pemendekan. Semakin tebal lapisan pasir maka jumlah sesar yang terbentuk lebih sedikit sebaliknya semakin tipis lapisan maka jumlah sesar yang terbentuk lebih banyak. Perbedaan ukuran butir material akan menghasilkan pola struktur dan jumlah sesar yang berbeda pula.

REKONSTRUKSI STRUKTUR GEOLOGI DI BINUNGAN BLOK 1-2 DAN PARAPATAN, KECAMATAN TANJUNGREDEB, KABUPATEN BERAU, KALIMANTAN TIMUR Alfeus Yunivan Kartika
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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The research area is administratively located in Binungan Block 1-2 and Parapatan Block, TanjungredebDistrict, Berau, East Kalimantan. Binungan 1 – 2 and Parapatan which owned by PT. Berau Coal, separated by KelaiRiver. The purpose of this study was to determine the geological structure in both block based on the correlation of thewell drilling and surface data. The research used field observations to obtain data on surface geology also wellcorrelation using e-logging data, consist of gamma ray log, caliper log, short density log, and long density log. Surfacedata analysis using stereonet to get the main stress affecting in research area and evolving types of geological structures.Well correlation is a basic method in geological structure reconstruction, which conducted to determine subsurfacecondition. Lithology of research area, from old to young consisted of clayey sandstone and sandstone units, whichincluded in Middle Miocene aged, Latih Formation and Holocene aged alluvium sediments. The result of data analysisindicated that the geological structures type that evolved in the research area is a plunging syncline with the axistrending north – south and sinistral – wrench fault trending west – east. Syncline is folded sorrounding rocks on the bothblocks and continuous from Binungan 1-2 to Parapatan. The sinistral – wrench fault in Kelai River caused the shiftingposition of the axis of syncline. The geological structure formed during the Pliocene as a result of the coupling faultsliding motion in north and south area of research location. Mechanism of geological structure formation in researcharea begins with syncline formation with axis trending north – south, the force continues causes the formation of thethird order strike – slip fault from mangkalihat fault. This strike – slip fault causes the folds axis cutted and shifted, alsocaused the plunging syncline.

KAJIAN PENGARUH PENGAMBILAN AIRTANAH LOKASI SEKITAR RUMAHSAKIT PENDIDIKAN UNIVERSITAS DIPONEGORO TERHADAP SUMBER AIR MASYARAKAT DENGKEKSARI, KECAMATAN TEMBALANG, KOTA SEMARANG Tyas Putri Maharani
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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Pendidikan Universitas Diponegoro Hospital is located on the Campus of Diponegoro University, Tembalang, Semarang is the hospital that was built for the ministry of health, this condition is certainly to need water to meet their daily.This needs are from groundwater through water sources that are owned. Pendidikan Universitas Diponegoro Hospital to make 3 deepwell with 80-120 metres deep. In addition the Dengkeksari society located in the north of hospital, use spring to provide their daily in water. They live under the clif or rock in front of the hospital. The springs flow hole volcanic brecia layer, then water is used by the society to provide their daily need in water.It needs to do an observation to know aquifer condition used by hospital and society of Dengkeksari. This observation uses schlumberger geoelectric method. So the condition under surface in observation location is detectable. So the location of aquifer used by hospital and the society is known.Based on the result of log geolistrik can be seen that the resource is in aquifer layer primer and deepwell of the hospital are in aquifer layer second, so there is no negatif effect of using the deepwell with the condition of the resource used by dengkeksari because of difference aquifer..

POTENSI AIRTANAH PADA AKUIFER REKAHAN BATUAN BEKU BERDASARKAN DATA GEOLISTRIK DAN UJI PEMOMPAAN DI ULUBELU GEOTHERMAL POWER PLANT PROJECT, PROVINSI LAMPUNG Novandi Kusuma Prasetya Wangsadiria
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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Water was needed to be supplied to the cooling tower of Ulubelu Geothermal Power Plant Project area. The use of surface water was not recommended due to the impact that would occured to agricultural and plantational sector around the area. Hence, the study of groundwater resources on the aquifer of fractured igneous rock by geoelectric and pumping test data was performed.The objectives of the study consists of determining the typical, depth and characteristic of aquifer, establish the value of well efficiency, coefficient of transmissivity (T), coefficient of permeability (K) and coefficient of storage (S), establish the class, characteristic and type of groundwater chemistry and its relation to the environment, and define the qualitative and quantitative of groundwater potential on the field study. The methods were using resistivity and pumping test analysis, and supported by groundwater chemistry analysis, borehole log, petrography and outcrops observation. Geoelectric method was using pole-pole configuration as much as 8 lines. Pumping test consists of step drawdown test, constant rate test and recovery test.The correlations of 2D resistivity cross-section and inversion model were using Rockwork and obtained 3D visualization of zone of fractured aquifer potential. The depth of aquifer was ranging 75-150 m with water table about 50-65 m. Pumping test has carried out on well Mella-01, Mella-02 and Mella-03. The results obtained good well efficiency that is more than 90%. Coefficient of transmissivity and coefficient of storage were calculated using Theis recovery method and obtained T 3,441-5,205 m2/day and S 0,022-0,054. The value of S showed that the type of aquifer is unconfined. Coefficient of permeability 0,681-0,713 m/day and supported by petrography analysis indicates the characteristic of fractured igneous rocks. Groundwater quantity was obtained 192 m3/day and the quality indicated by the type of groundwater chemistry that rank of carbonate and semi-carbonate type. Considering from the neutral pH, total dissolved solids, EC and Chloride content, groundwater was categorized fresh water.

ANALISIS FASIES DAN PERMODELAN SIKUEN STRATIGRAFI BATUAN KARBONAT LINTASAN KORIDO, FORMASI WAINUKENDI, KABUPATEN SUPIORI, PAPUA Joshua Shima; Hadi Nugroho; Fahrudin Fahrudin; Asep Kurnia Permana
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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Korido is located in Supiori District , Papua , Indonesia . This area is in the north of the Central Range and included in the North Irian Basin which is the fore arc basin (Mc Adoo & J.C. Haebig, 1999). Own research area based on geology map created by Masria et al ( 1981) composed by Wainukendi Formation which is composed predominantly by carbonate sedimentary rocks .The purpose of this study is to determine the pattern of lithology and lithological boundaries were obtained from measured stratigraphy along the trajectory of research which is then integrated with the micro facies analysis and facies zone were obtained by petrographic analysis to determine the depositional environment and depositional processes that occur in Wainukendi Formation. More over, the relative age determination is also done based on the analysis of large benthic foraminifera so the deposition process can be integrated with relative age . The ultimate goal of this research is to integrate field data, micro facies analysis results and deposition process analysis results to create a model of sedimentation, determining stratigraphic marker, and the determines system tract that develops in Wainukendi Formation in the study area .The method used in this research is geological mapping focused on stratigraphy subjects in Korido area to get lithostratigraphy sequence, platform type, sedimentation processes, and laboratory analysis include petrographic analysis to determine micro facies and facies zone and paleontological analysis to determine the relative age which then integrated to obtain stratigraphic marker and systems tract that develops in Wainukendi Formation. From the analysis of platform type showed the type of platform existing in this area is rimmed shelf type which is then used as a reference in micro facies analysis according to Wilson (1975) to obtain 4 facies zone that exist in this study area is reef platform margin , slope , toe of slope apron and deep shelf . Based on the analysis of the deposition process obtained 3 cycles of sedimentation that occurred from Wainukendi Formation . From the results of this analysis are used in determining the stratigraphic sequence to obtain stacking patterns that evolve based sequence boundary and its systems tract is composed of LST - TS - MFS - TST - HST so that obtain a full cycle changes in accommodation space and sediment supply where there is an increase in accommodation space which was offset by an increase in the supply of sediment in LST phase is characterized by progradation and agradation, an increase in the supply of sediment is lower than the increase in accomodation space in TST phase is characterized by retrogradation, and lastly, a decrease in accommodation space while sediment supply rate is still high in HST phase characterized by progradation.

IDENTIFIKASI KARAKTERISTIK ALTERASI HIDROTERMAL DAN MINERALISASI ENDAPAN EMAS EPITERMAL DAERAH PROSPEK RAMADA, KECAMATAN CIMANGGU, KABUPATEN PANDEGLANG, PROVINSI BANTEN Gregorius Agung Chrishartantyo; Yoga Aribowo; Dian Agus Widiarso; Andi Kurniawan
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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Cibaliung Gold Project area is one of the largest primary gold deposits mineralization prospect areas in the western part of Java island which is controlled by PT. Antam (Persero) Tbk.. The research area is part of the Cibaliung Gold Project area called Ramada Prospect. Administratively, Ramada Prospect located in Cimanggu Subdistrict, Pandeglang District, Banten Province. Research conducted aimed to determine the geological condition, characteristics of hydrothermal alteration and gold deposition mineralization, as well as predicting the environmental conditions of hydrothermal constituent.Research conducted with descriptive and qualitative analysis approach. The research method used consists of literature study, field observation, and laboratory test. In the literature study methods conducted assessment of the theoretical basis and previous research. Field survey methods consists of geological mapping, mapping of alteration and mineralization, as well as description and identification of rock core drilling results. In the laboratory test method conducted descriptions and identifications of petrographic, mineragraphy, and X-Ray Diffraction (XRD) to some rock samples and veins, as well as analysis of geological structure stereographic method. The research was also supported by secondary data such as AAS (Atomic Absorption Spectrometry) test results.Lithology of research area consists of tuff rock units, pyroclastic breccia rock units, and andesite lava flow rock units. Pyroclastic breccias rock units and andesite lava flow rock units are interpreted as pre-mineralization rocks, whereas tuff rock units are interpreted as post-mineralization rocks. Based on the analysis of geological structure there is interpreted strike-slip fault has affected geological conditions of the research area. Hydrothermal alteration in the research area can be divided into alteration facies of kaolinite-smectite-chlorite±quartz±carbonate-pyrite replacement-infill strong intensity and alteration facies of chlorite±epidote±sericite±quartz±carbonate-pyrite replacement-infill moderate-strong intensity. Gold deposition mineralization (Au) in the research area predominantly formed on quartz±carbonate veins. The presence of gold associated with silver (Ag) and pyrite (FeS2). The main prospect gold deposits mineralization in the research area contained in "Ramada" veins. Hydrothermal environment in research area interpreted as a low sulfidation epithermal deposition system that developed in the ancient depths of 120 m - 340 m with temperatures around 175 °C - 225 °C.

ANALISIS PERUBAHAN FASIES DAN LINGKUNGAN PENGENDAPAN DI BLOK A PADA FORMASI MELUHU, CEKUNGAN KENDARI, PROVINSI SULAWESI TENGGARA Febry Irfansyah; Hadi Nugroho; Yoga Aribowo
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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Limitations of field geological data and subsurface surveys are one of the causes of unattractiveness oil and gas exploration activities in the old basins in eastern Indonesia because it has a high risk that is always avoided by investors in the oil and gas. The research location in Meluhu Formation, Kendari Basin, which is one of Upper Triassic formations in eastern Indonesia is estimated to have potential for hydrocarbon resources. Therefore, to find out more about this potential is conducted by field geological survey that generate data on sedimentology and stratigraphy. This study aims to determine facies and depositional environment that formed in three tracks of stratigraphic section in Block A, Meluhu Formation, Kendari Basin, and to know the changes in facies and depositional environment vertically associated with the impact of sea level changes. The methodology used in this research is descriptive and analysis methods. The descriptive method is done by literature study and field survey includes stratigraphic section measurements at selected tracks, while for analysis methods are litofasies analysis, facies associations, petrographic analysis, and sequence analysis of the relative age. Based on the four analysis, a stratigraphic column of the study area that are arranged based on the relative age of rocks are made and used to determine the pattern of changes in facies and depositional environment vertically. From the combined results of the four methods of analysis, the interpretation of different facies and depositional environment in three stratigraphic section measurements in this area are obtained. On the first track named LS301, some facies found, such as mud flats, mixed flats, sand flats, and tidal channel, which characterize the tidal flat depositional environment. In the second track named LS303, channel fills and overbank facies are found, which characterize the fluvial depositional environment. On the third track named LS306, facies mud flats and sand flats that characterize the deposition of tidal flats are found, and the dominance of overbank and channel fill facies that characterize the fluvial depositional environment. From the analysis of the relative age, the sequence between tracks from old to young is LS301, LS303, and the LS306. So, changes in facies and depositional environment vertically starts from tidal flat and change into fluvial. Compared with the eustacy curve of the Upper Triassic age by Haq (1987) which shows a pattern of decline in sea level, vertical changes on Block A match to the facts on the field.

METODE GROUTING UNTUK MENINGKATKAN DAYA DUKUNG TANAH DI BANGUNAN STASIUN POMPA DRAINASE SIBULANAN, PEKALONGAN, JAWA TENGAH Surya Murdani
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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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.

MODEL KONSEPTUAL PERKEMBANGAN DELTA SEPINGGAN, INTERVAL “MFS 1-MFS 5”, BLOK SOUTH MAHAKAM, CEKUNGAN KUTAI, KALIMANTAN TIMUR Irfandi Oky Permana; Hadi Nugroho; 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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The energy demand are growing by day, 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. Process on Sepinggan Delta are regretion process dominated on Early Miocene – Middle Miocene (N4-N14), and transgretion process on Middle Miocene –Late 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.

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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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