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PENYELIDIKAN ZONA AKUIFER DENGAN SURVEI PENDUGAAN GEOLISTRIK METODE SCHLUMBERGER STUDI KASUS DAERAH KECAMATAN KALIWUNGU DAN SEKITARNYA, KABUPATEN KENDAL, JAWA TENGAH Enda Mora Nasution
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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Morphological differences research area affect to subsurface conditions. To determine subsurface conditions and hydrogeological conditions of the study area, then conducted research with geoelectric method.Geoelectric is a geophysical method used to determine geological subsurface conditions based on the variation of the resistivity of the rock types. Research area is located in Kaliwungu, Kendal Regency, Central Java. This area consisted by Damar Formation (QTd) and Alluvium Deposits (Qal). Damar Formation consisted by 3 lithological units, named : volcanic breccia, tuffaceous sandstones and conglomerates. Alluvium Deposit consisted by of sand, gravel, and pebble. The purpose of this study was to determine the zone and type of aquifer and direction of groundwater flow, based on Schlumberger geoelectrical method and groundwater level measurement on some shallow wells.This research used Schlumberger geoelectrical method. Geoelectric point in the study area totaled 15 points and as many as 16 MAT measurement data points are scattered in the study area. Data processing is done using software IPI2win to determine the actual value of resistivity and thickness of each layer and Surfer9 to determine groundwater flow direction.Based on the results of geoelectrical data processing on each lithological resistivity values, this research area formed by rock mudstone (≤ 10 Ωm), sandy mudstone (10-20 Ωm), sandstones (20-100 Ωm), and volcanic breccia (> 100 Ωm). Lithological type of the aquifer in research area is expected to be sandstones which have a good permeability and porosity. A geoelectrical section and correlation is made to determine the location, dimensions and types of aquifers that occur in the study area. The aquifer type identified by the correlation was uncofined aquifers, perched aquifer and confined aquifer. Groundwater flow direction based on the measurement of shallow wells tend to the north area of research.

PEMETAAN GEOLOGI PADA PENAMPANG 140 UNTUK MENGETAHUI SEBARAN LITOLOGI, ALTERASI, MINERALISASI, DAN DENSITAS VEIN BESERTA HUBUNGANNYA DENGAN KEBERADAAN ZONA HIGH GRADE ORE PADA ENDAPAN PORFIRI BATU HIJAU PT. NEWMONT NUSA TENGGARA TENGGARA Siti Nurul Qamarih
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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Mineral mining industry is much needed at the present time given themetal commodities is increasing from year to year. With increasing demands this,and the search for an evidentiary contained mineral reserves requires severalsteps in exploration activities in the early stages and update data. Batu Hijau is aporphyry copper-gold deposition (Cu-Au) with its formation is controlled by thedistribution of lithology, alteration processes, and vein density. The purpose of this study was to determine the distribution of lithology,alteration, mineralization, and vein density and its relationship with the presenceof high grade ore that is focused on section 140. The method used in this final study was conducted logging geologyconsisting of 14 drill holes, highwall mapping at a distance of ± 200 m, located onthe Northwest wall and across the Southeast section 140, and blasthole polygonmapping lies in the Northwest and Southeast the cross section 140. Based on drill hole logging, highwall mapping and blasthole mapping,lithology found growing at the study site consists of volcanic rock, equigranularquartz diorite rocks, tonalite intermediates rocks, and young tonalite rocks.Alteration consists of developing secondary biotite alteration (potassicalteration), partial biotite alteration (potassic alteration), pale green micaalteration (phyllic alteration), and chlorite-epidote alteration (propyliticalteration). Mineralization developed in the study site consists of bornite mineralcomposition largest copper 0.63% followed by 0.34% mineral chalcopyrite andpyrite minerals as mineral broadcaster.In the analysis stage is divided into themineralized zone, the dominant of mineral bornite (Bn> Cp> py), the dominant ofmineral chalcopyrite (Cp> Bn> py) and the dominant of mineral pyrite (Py> Cp>Bn). Vein density were found in the location of research classified as veindensity> 10%, vein density is 5% -10%, vein density is 3% -5%, and the density ofveins <3% with type vein vein consists of type A, type B vein, vein type C andmagnetite veins. The presence of high grade ore zone at section 140 contained inthe intermediate tonalite lithologies that are host rock mineralization along siderocks in contact with intermediate tonalite rocks on stage secondary biotite andpale green mica alteration, the dominant mineralization bornite and chalcopyrite,with vein density > 5%. Thus prioritized production targets on the physicalconditions.

PENYELIDIKAN ZONA AKUIFER MENGGUNAKAN GEOLISTRIK METODE SCHLUMBERGER DI SEKITAR PANTAI UTARA KECAMATAN KRAMAT, SURADADI DAN WARUREJA KABUPATEN TEGAL, JAWA TENGAH Dedi Setiono; Henarno Pudjihardjo; 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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Salah satu permasalahan yang sering terjadi di kecamatan Kramat, Suradadi, dan Warureja, Kabupaten Tegal adalah sulitnya masyarakat mendapatkan air bersih untuk kebutuhan industri maupun kebutuhan sehari-hari. Kesulitan tersebut disebabkan karena belum adanya data pendukung untuk dilakukannya pengeboran airtanah sehingga tentunya masyarakat merugi bila hasil pengeboran airtanah mereka belum kunjung menemukan sumber air bersih. Tujuan dari penelitian adalah menentukan zona akuifer, jenis akuifer dan arah aliran airtanah berdasarkan pemetaan hidrogeologi dan pengolahan data geolistrik metode Schlumberger.Geolistrik merupakan metode geofisika yang digunakan untuk mengetahui kondisi geologi bawah permukaan berdasarkan variasi nilai resistivitas jenis batuannya. Metode yang digunakan pada penelitian ini adalah geolistrik metode Schlumberger, dengan 16 titik pengukuran geolistrik yang tersebar di sekitar pantai utara Kabupaten Tegal. Proses pengolahan data dilakukan menggunakan software IPI2win untuk mengetahui nilai resistivitas sebenarnya beserta kedalamannya.Hasil interpretasi litologi berdasarkan nilai resistivitas batuan, dapat dikelompokkan menjadi lempung air Asin (0,06-0,27 Ωm), lempung air Payau (0,4-0,99 Ωm), lempung air tawar (1,057-9,714 Ωm), lempung pasiran (10,18-19,87 Ωm), pasir (20,44-119,7 Ωm) dan gravel (≥ 124,3 Ωm). Litologi akuifer pada daerah penelitian berupa pasir yang memiliki sifat permeabilitas dan porositas yang baik. Hasil dari nilai resistivitas dibuat penampang geolistrik dan dikorelasikan untuk menentukan letak, dimensi dan jenis akuifer yang terdapat pada daerah penelitian. Jenis akuifer yang terlihat dari hasil korelasi adalah akuifer bebas, akuifer bocor dan akuifer tertekan. Debit aliran airtanah pada akuifer tertekan pada wilayah penelitian ini adalah 4090,82 m3/hari. Nilai tersebut setara dengan 47,35 liter/detik atau setara dengan 1.493.149,3 m3/tahun.

ANALISIS HASIL PENGUJIAN SONDIR UNTUK MENGETAHUI PENINGKATAN KEKUATAN TANAH SANGAT LUNAK DI LOKASI GATE HOUSE DALAM PEKERJAAN “GROUTING AT SEMARANG PUMPING STATION & RETARDING POND” Hendry Tri Wibowo
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 water building structure at the mouth of the Semarang river as a flood prevention building in Panggung Lor village is a high settlement risk building structure. This is caused by lithological estuary region consisting predominantly of fine clay-sized sediments with a low level of consistency. The low value of consistency is comparable to the soil bearing capacity value of the water structure foundation pillars. Analysis of the Semarang river Gate House cone penetration test results aims to determine the increase of soil bearing capacity with the method of grouting on the site by using the cone penetration test results. From the three trial soil penetration test location before the grouting process, the very soft clay was found in the 0,6 to 15 metres in depth with 1 up to 4 kg/cm2 of cones resistance value. For deepness 14,00 m - 20,00 m there are soft clay with cones resistance value ( qc) 5 - 8 kg / cm2.. The determining processes of soil bearing capacity then consist of several processes. Based on this, the ultimate bearing capacity mean value before the grout process is about 19,45 with the allowable bearing capacity mean value about 3,97 ton. The ultimate bearing capacity mean value after the grout is about 38,557 ton with the allowable bearing capacity mean value 7,8625 ton. It appears that the increase of ultimate bearing capacity is about 98 % or about 1,9 times greater than before.

PEMETAAN KERENTANAN DAERAH POTENSI LIKUIFAKSI, AKIBAT GEMPABUMI TEKTONIK STUDI KASUS DAERAH DESA PANJANGREJO DAN SEKITARNYA, KECAMATAN PUNDONG, KABUPATEN BANTUL, DAERAH ISTIMEWA YOGYAKARTA Alwyn Taufana Jati Putra
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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Earthquake, is an event that generally occurs in the places where the activetectonic plates passed. One of the impact caused by earthquake is liquefaction.Liquefaction is a phenomenon where the soil loss it’s strenght due to the tremor.Liquefaction occurs in loose sandy soil (not solid) and highly contained by water. Thestudies location is located in Panjangrejo village and surrounding, Sub-district Pundong,Bantul Regency, Special Region of Yogyakarta. The studies is located in South JavaRegion, which included in earthquake prone area. In a research location included in theYoung Mount Merapi Volcaniv Deposit Formation (Qmi) which contained by loosematerial result by volcanic deposits and Nglanggran Formation (Tmn) which composedby volcanic breccia. The depth of groundwater on the studies area is relatively shallow.The purpose of this research is to determine zoning area with potential liquefaction. This studies using lithology mapping method and groundwater surface mapping bymeasuring 41 points of recidence’s well. Another method used is mechanical soil sampletest, undisturbed type in 4 points and calculation method of analytic hierarchy process fordetermining the liquefaction prone zone. The result based on mapping method isgeological map, geomorfology map, and groundwater surface map. Based on the result of data processing and the result of soil test and direct sheartest on undisturbed type of soil sample test, result obtained in the area Klisat (watercontent 25.07%, porosity 49.57%, cohession 0.06 kg/cm2), Panjang Area (water content20.82%, porosity 47.67%, cohession 0.04 kg/cm2), Nglorong Area (water content32.35%, porosity 52.54%, cohession 0.13 kg/cm2) and Ngentak Area (water content26.40%, porosity 50.24%, cohession 0.11 kg/cm2). The result of measurements ofgroundwater surface and soil mechanics test result are used as paremeter factor forcalculation using analytic hierarchy process method for making clasification from thosearea based on their class value. From the calculation results, obtained three classes ofpotential liquefaction susceptibility zonation, first is a zone of high liquefaction potential,zone of medium / moderate liquefaction potential, and low – very low liquefactionpotential.

STUDI SIKUENSTRATIGRAFI BERDASARKAN HASIL ANALISIS DATA PALINOLOGI PADA SUMUR Y, CEKUNGAN SUMATERA SELATAN Rizki Ramadhan; Hadi Nugroho; Yoga Aribowo; Panuju Panuju
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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Palynology is a study of biostratigraphy for determining relative age and depositional environment basedon the abundance of palynomorf. Palynology study develompent in Indonesia is still could be more increasedalong with more oil and gas exploration moved to transitional environtment.Study of palynology in stratigraphy is aiming to determine relative age and depositional environment.Besides, palynology could also determine sequence stratigraphy in a large scale of study based on palynomorfpercentage. The study of sequence stratigraphy based on palynomorf percentage has been done in Well-Y, SouthSumatra basin.The method of this research is descriptive method through the microscopic observation on sample 1 - 14from 1400 m depth Y-Well’s cutting and quantitative method calculation and analysis method from thisobservation and calcuation could determine the percentage of each palynomorf. This percentage lead to a trendthen interpretated into several sequencestratigraphy.From this observation, it can be determined characteristic zone of this well. The characteristic zone ofpalynology in this well is divided into 3 zones of palynology; Proxapertites operculatus Zone, Flocshuetziameridionalis Zone, and Stenoclaeniidites papuanus Zone. Each zone shows the characteristic of age fromEocene to Pliocene and also depositional environment from delta plain to pro delta. From palynomorfpercentage trend, we may also see the pattern of sequece stratigraphy works in this depth. The percentage trendshows the time whether sea level fall at the minimum percentage of palynomorf and sea level rise at themaximum percentage of palynomorf. The trend shows the sequence with sequence boundary lying in the startand the end of the sequence and also transgressive surface indicates the sea level start rise. Overall, this wellhas 5 sequences based on this trend; sequence a, sequence b, sequence c, sequence d, and sequence e and all thesequences are bordered by sequence boundary.

ANALISIS MASERAL DENGAN METODE REFLECTANCE VITRINITE UNTUK MENGETAHUI KUALITAS BATUBARA PADA SUMUR AL 25, LAPANGAN KINTAP, KABUPATEN TANAH LAUT PROVINSI KALIMANTAN SELATAN, PT. ANUGERAH LUMBUNG ENERGI Lutfi Hakim; Prakosa Rachwibowo; Dian Agus Widiarso; Bagus Zaqqie
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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The spread of coal deposits in Indonesia is quite large, most of coal basin is located in Sumatra and Kalimantan. One of the basin that produce economical coal deposit with value of calories more than 6.000 kal/g in Tanjung Formation is Asam-Asam Basin (Darlan etc, 1999). PT Anugerah Lumbung Energi is one of the coal mining companies with mining working area on Asam-asam basin. Research area is located in Kintap field, Tanah Laut Regency, South Kalimantan. The aim of this research is to find out about coal quality using maceral analysis with vitrinite reflectance method on well AL 25 and spread direction of coal seam at the research area.Methods of research are descriptive and analysis. Based on these methods, done the stage of the analysis and interpretation with data supporting are stratigraphical data and laboratory data. Activities performed such as geological mapping, maceral analysis with vitrinite reflectance methods and coal quality interpretation on well AL 25. The software used to support this undergraduate thesis are the Arcgis ,Autocad X 5 and Corel Draw. In Undergraduate Thesis, the author has divided into five phases, such as lithology description, cropline withdrawal based on strike and dip, maceral analysis, coal quality interpretation and results correlation of maceral analysis, rank and coal quality on the well AL 25.Based on the result of analysis data, it can be interpreted that lithology at the research area are sandstones, siltstone, claystone and thin layer of coal. The direction of seam coal ( cropline ) at the research area is southeast - northwest based on strike / dip. The results of the maceral analysis for each seam produce rank between Lignite to High Volatile bituminous B, whereas the results of the quality analysis for each seam produces a caloric value ranging from 12040.35 to 13786.69 Btu/lb or ranged from High Volatile Bituminous C to High Volatile Bituminous B. Based on the result of maceral analysis, rank and coal quality, it can be concluded that there are a mutual relation between maceral, rank and coal quality. The mutual relation is when the high percentage value of vitrinite reflectance so that value of coal calorie is good too.

PEMODELAN PEMASANGAN PENYANGGA SEMENTARA MENGGUNAKAN PERANGKAT LUNAK PHASE 2 PADA HEADRACE TUNNEL CHAINAGE 45 M – 155 M DI PLTA TULIS KABUPATEN BANJARNEGARA, JAWA TENGAH Ghozali Mahmud
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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In the process of tunnel construction, the support design process is a very important thing to do. This process must be done carefully and thoroughly in order to obtain cost efficiencies expenditureon the tunnel project. Because the total expenditure in the construction of a tunnel is not cheap. This support planning process itself is divided into two namely the planning of temporary andpermanent support. The support planning usually is done before and the time of tunnelconstruction. This research aims to model the geological conditions around the tunnel, the tunnel pit conditions before supporting system installed, and the temporary support design of theheadrace tunnel of Tulis Hydropower Banjarnegara Residence, Central Java Province. So we willknow types of the most appropriate support based on physical properties, rock mechanics and rock mass behavior along the tunnel. The research method used is descriptive and experimentalmethods. By way of temporary support modelling in headrace tunnel with Phase2 software . In thisresearch will analyze and make temporary support models of 45 m – 155 m chainage the headrace tunnel. In the chainage will be made 3 models (II b, III a, and III b) based on rock mass ratingvalue Based on the modelling results it is known that for class II b has a total displacement of < 5mm. So the installation of supports on class II b is relatively stable and secure there will be no collapse of the tunnel. As well as combinations obtained temporary support is most effective with atotal value that is the smallest displacementnya shotcrete 1 variations is 50 mm; 3 m long of rockbolts with spaced 2 m and 10 of its number ; shotcrete 2 variations 100 mm. Whereass the rock mass class III A and III B have > 5 mm in the result of total displacement. So the tunnel is will notstable and secure with a variety of shotcrete and rock bolts that has been done. It would requirethe addition of another temporary support variant form of steel set as installation instructions and supporting the tunnel excavation (After Bieniawski, 1989).

EVOLUSI TEKTONIK DI DAERAH NENAS DAN KEFAMENANU, NUSA TENGGARA TIMUR IMPLIKASINYA TERHADAP POTENSI PERANGKAP (TRAP) HIDROKARBON PADA CEKUNGAN TIMOR BAGIAN BARAT Arif Alfiansyah; Hadi Nugroho; Fahrudin Fahrudin; Joko Wahyudiono
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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In Timor island found many indications of hydrocarbons such as oil seeps, gas seeps and mud volcanoes. In the eastern part of the territory there are indications of more oil, while in the western part of the territory more gas indications (Charlton, 2001). It is a challenge for a geologist in particular to uncover all the potential that exists in the Timor Basin.The purpose of this study was to determine the composition of the stratigraphy in the study area, which is developing the geological structure and its relationship with the existing stratigraphy in the study area, the main emphasis is to work towards the western part of Timor Island, Explaining the tectonic evolution of the study area and type of trap hydrocarbons that exist in the study area.The method used in this thesis is a survey method and analysis methods. Methods of geological mapping survey with a description of the characteristics of each formation encountered and measured thick layer of rock that is useful for stratigraphic cross sections, and measurement of structural elements such as bedding plane, joint, faults and folds. Analysis method by analyzing both the geological structure alignment analysis and analysis stereografis.The composition of the regional stratigraphic in research area from old to young is Maubise Formation, Atahoc Formation, Cribas Formation, Niof Formation, Babulu Formation, and Aitutu Formation. Geological structures that developed in the study area at Permian old rocks there are a reverse fault has trending NW-SE, strike slip fault has trending N-S, and normal fault has trending NW-SE, whereas in Triassic old rocks there are a reverse fault has trending NE-SW, strike slip fault has trending NE-SW, and normal fault has trending NE-SW. Look at the similarity of has trending reverse fault and normal fault orientation at Permian age, interpreted that reverse fault is result of reactivation from normal fault plane with same plane orientation. This also applies to Niof Formation, Babulu Formation and Aitutu Formation are Triassic old rocks there are a reverse fault has trending NE-SW and normal fault has trending NE-SW. the similarity of that trending orientation can interpreted as a result from reactivation of that happened at Permian old rocks. The main stress in Permian old rocks is NE-SW, while in Triassic old rocks is E-W. Based on analysis, trap hydrocarbon potential is structural trap with type are anticline and reverse fault

PENENTUAN ZONA PROSPEK RESERVOIR HIDROKARBON PADA TAHAP EKSPLORASI DENGAN ANALSIS PETROFISIKA FORMASI BATURAJA LAPANGAN “IRFA” BLOK SEKAYU CEKUNGAN SUMATERA SELATAN Rizky Septianingrum; Hadi Nugroho; Wahju Krisna Hidajat; Herlina Rachman; Yermia Heriadji
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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South Sumatera basin is one of the basin area in Indonesia that has considerable hydrocarbon potential, particularly in the field by IRFA well as the research of the physical properties of a reservoir characteristics including type of lithology, shale volume, porosity, permeability and water saturation value which is fundamental to the activities of oil and gas exploration.The purpose of this research was to determine the physical properties of the reservoir that developed in the areas include shale volume (Vsh), porosity (Ф), permeability (K), water saturation (Sw) zone which in turn can be determined that there is the prospect of hydrocarbon reservoir in the reservoir-3 on the well IRFA-1. The method used is descriptive method is a method that is done from multiple libraries. While the analytical methods used are qualitative analysis and quantitative. Qualitative analysis is to conduct research lithology and correlation of 7 wells located in the study area, while for the quantitative analysis was conducted on the calculation of reservoir petrophysical properties among other shale volume, porosity, permeability and water saturation then be determined net pay identified as areas reservoir will know where is hydrocarbon prospects and the prospects for the determination of hydrocarbon reservoir zones in this study is supported by the chromatograph of analysis done by knowing the value of the total gas C1, C2, C3, iC4, nC4 IRFA-1 well.Based on data analysis and discussion of reservoir-3 well IRFA-1 has a value of shale volume average of 22%, porosity 26%, permeability 371 mD, water saturation of 38%. This calculation is obtained by using a cutoff value for the volume of shale reservoirs <50%, effective porosity >9%, water saturation <60%. The results of the calculation of the average value cromatograph C1 / C2 = 4.14 ppm, C1 / C3 = 7.34 ppm, C1 / C4 = 18.46 ppm, C2 / C3 X 10 = 17.8 ppm. From the results of the data analysis and discussion can be interpreted that the reservoir-3 well IRFA-1 at a depth of 4298.3 to 4353 feet of a reservoir zone with oil prospects.

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