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Studi Batuan Asal (Provenance) dan Diagenesis Batupasir Formasi Ngrayong Daerah Tempuran dan Sekitarnya, Kecamatan Medang, Kabupaten Blora, Jawa Tengah Abdillah, Faizal
Geological Engineering E-Journal Vol 5, No 1 (2013): Volume 5, Nomor 1, Tahun 2013
Publisher : Geological Engineering E-Journal

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Geographically, the study area is at 9241000 mN - mE 9235000 mN and 548 000 - 555 000 mE (UTM WGS 84, Zone 49S) and administratively located in Tempuran Regional, District Medang, Blora regency, West Java Province. Based on physiographic zones Van Bemmelen (1949) study area into zones Antiklinorium Rembang - Madura.The research was conducted to determine rock origins (provenance) and the process that occurs in sandstone diagenesis Ngrayong formation, and to investigate the depositional environment Ngrayong formations that exist in the study area.The form of field data that collected in is stratigraphic cross-section measurements, the identification of the physical properties of rock and rock samples from observation stations scattered in research sites. Petrographic analyzes performed on thin section based on the rock samples.Based on the analysis of the mineral composition of sandstones quartz, feldspar and lithic fragments at Dickinson and Suzcek QFL diagram, 1979, Sandstones study area is estimated to come from recycled orogen of height karimunjawa formed by the collisions. While symptoms of diagenesis recorded from petrographic analysis showed sandstones having eogenesis stages in the meteoric environment based on red beds forming. Sandstone also experienced mesogenesis stages with symptoms such as compaction diagenesis with sutures contact, dissolving feldspar,, quartz overgrowth and cementation. Stages telogenesis indicated by deformation of outcrop in the study area. Ngrayong Formation depositional environment on the area of research is in deltaic to a shallow sea with river-dominated type.

ANALISIS SEBARAN FASIES DISCRETE ROCK TYPE (DRT), LAPISAN BASAL SAND DENGAN METODE ROCK TYPING PADA LAPANGAN MINYAK JULIE, CEKUNGAN ASRI, SUMATRA TENGGARA Nahari, Julie Juwita
Geological Engineering E-Journal Vol 5, No 2 (2013): Volume 5, Nomor 2, Tahun 2013
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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 0.0314â(k/ð), Normalized Porosity Index (ðz) which is equal to ð/(1-ð), then get the value of Flow Zone Unit (FZI) which is equal to RQI/ð, 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 ðz VS RQI, obtained 5 grouping rock types (DRT) there are DRT 0 (FZI = <0.0508 Âµm), DRT 1 (FZI = 0509-1073 Âµm), DRT 2 (FZI = 1,156 - 1,610 Âµm), DRT 3 (FZI = 1.62 - 3.96 Âµm) and DRT 4 (FZI => 0.9 Âµm). 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.Â

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 Sustriani, Yunita
Geological Engineering E-Journal Vol 5, No 1 (2013): Volume 5, Nomor 1, Tahun 2013
Publisher : Geological Engineering E-Journal

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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.Â

INTERPRETASI LINGKUNGAN PENGENDAPAN FORMASI TALANG AKAR BERDASARKAN DATA CUTTING DAN WIRELINE LOG PADA LAPANGAN X CEKUNGAN SUMATERA SELATAN Dewi, Ivada Pratama
Geological Engineering E-Journal Vol 5, No 1 (2013): Volume 5, Nomor 1, Tahun 2013
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A sedimentary environment is a part of earthâs 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.Â

ANALISIS GROUTING TEST, STUDI KASUS PERENCANAAN BANGUNAN GEDUNG PT. ASTRA OTOPARTS (PERSERO) TBK, KECAMATAN NGALIYAN, KOTA SEMARANG, JAWA TENGAH Afrianda, Ricky
Geological Engineering E-Journal Vol 5, No 2 (2013): Volume 5, Nomor 2, Tahun 2013
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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.

PEMETAAN GEOLOGI STRUKTUR UNTUK MENENTUKAN GAMBARAN TEKTONIK DAERAH KAWENGEN DAN SEKITARNYA, KECAMATAN UNGARAN TIMUR, KABUPATEN SEMARANG Putro, Christian Widiasmoro
Geological Engineering E-Journal Vol 5, No 1 (2013): Volume 5, Nomor 1, Tahun 2013
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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 â 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 â east, north - south, and northwest â southeast. From the stereographic analysis, main direction that form the geological structure are northwest â southeast, north â south, southwest â 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 â 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 â Last Miocene and last occurred in the Last PlioceneÂ - Early Pleistocene.

REKONSTRUKSI STRUKTUR GEOLOGI DI BINUNGAN BLOK 1-2 DAN PARAPATAN, KECAMATAN TANJUNGREDEB, KABUPATEN BERAU, KALIMANTAN TIMUR Kartika, Alfeus Yunivan
Geological Engineering E-Journal Vol 5, No 2 (2013): Volume 5, Nomor 2, Tahun 2013
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The research area is administratively located in Binungan Block 1-2 and Parapatan Block, TanjungredebDistrict, Berau, East Kalimantan. Binungan 1 â 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 â south and sinistral â wrench fault trending west â east. Syncline is folded sorrounding rocks on the bothblocks and continuous from Binungan 1-2 to Parapatan. The sinistral â 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 â south, the force continues causes the formation of thethird order strike â slip fault from mangkalihat fault. This strike â slip fault causes the folds axis cutted and shifted, alsocaused the plunging syncline.Â

POTENSI AIRTANAH PADA AKUIFER REKAHAN BATUAN BEKU BERDASARKAN DATA GEOLISTRIK DAN UJI PEMOMPAAN DI ULUBELU GEOTHERMAL POWER PLANT PROJECT, PROVINSI LAMPUNG Wangsadiria, Novandi Kusuma Prasetya
Geological Engineering E-Journal Vol 5, No 1 (2013): Volume 5, Nomor 1, Tahun 2013
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Water was needed to be supplied to the cooling tower ofÂ 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 PERUBAHAN FASIES DAN LINGKUNGAN PENGENDAPAN DI BLOK A PADA FORMASI MELUHU, CEKUNGAN KENDARI, PROVINSI SULAWESI TENGGARA Irfansyah, Febry; Nugroho, Hadi; Aribowo, Yoga
Geological Engineering E-Journal Vol 5, No 1 (2013): Volume 5, Nomor 1, Tahun 2013
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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.Â Â Â Â Â Â Â Â Â Â Â 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. Â Â Â Â Â Â Â Â Â Â Â 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.Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 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.

PEMETAAN GEOLOGI, ALTERASI, MINERALISASI DAN KERAPATAN URAT KUARSA PADA BENCH 210 UNTUK MENGETAHUI PENGARUH KERAPATAN URAT KUARSA TERHADAP MINERALISASI DAN NILAI KADAR TEMBAGA ENDAPAN PORFIRI CU-AU BATU HIJAU, SUMBAWA, NTB Kusuma, Laraswati Jiwatami Dwi
Geological Engineering E-Journal Vol 5, No 2 (2013): Volume 5, Nomor 2, Tahun 2013
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Porphyry deposit is one of hydrothermal deposit which has potential to yield economic minerals such as gold, copper and molybdenum. Studying thegeological concept of porphyry deposit like lithology aspect, type andcharacteristic of alteration, mineralization style and vein type can laid to conceptof mineralization environmental that can generate ore. Study of mineralization inporphyry deposit also need quartz vein density analysis to determine the highgrade and low grade mineralization zone.This research is purposed to determine the distribution of lithology, zone of alteration and the relationship between quartz vein density and mineralizationin Batu Hijau Porphyry Deposit. Furthermore the result of the research can bethe consideration for geologist to mine the high grade materials.The methods that used to analyze the relationship between quartz vein density and mineralization on Bench 210 Batu Hijau Porphyry Deposit are bydoing highwall mapping on north and east side of Bench 210 open pit and logging121 geological cores which passed bench 210 (each coreâs length 15 meters).From the approach above, known that lithology from old to young are Volcanic wallrock, Diorite Intrusion, Intermediate Tonalite Intrusion and YoungTonalite Intrusion. Megascopic and microscopic observation show that alterationon research area can be divided into 5 alteration zones, they are: Partial BiotitZone (potasic zone), Secondary Biotite Zone(potasic zone), Pale Green Mica Zone(argilic zone), Chlorite-Epidote Zone (philic zone) and Feldspar Destructive Zone(propilic zone). Mineralization that occurs in research area is copper-sulfidemineralization. Bornite (Cu5FeS4) and Chalcopyrite (CuFeS2) are the maincopper sulfide ore and Pyrite as gangue mineral. Quartz vein density zone onresearch area is divided to very abudant quartz vein density (10-15%), abundantquartz vein density (5-9,9%), moderate quartz vein density (3-4,9%) and rarequartz vein density (0,3-2,9%). There are positive relationship between quartzvein distribution and Cu assay content. The higher quartz vein density in Bench210 is the higher Cu assay content and generally occurs in Bornite dominatedzone. And the lower quartz vein density is the lower Cu assay content andgenerally occurs in Pyrite dominated zone.

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