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HUBUNGAN KONDISI GEOLOGI TERHADAP ALTERASI DAN MINERALISASI ENDAPAN EPITHERMAL DAERAH SUALAN, KECAMATAN TALEGONG, KABUPATEN GARUT, PROVINSI JAWA BARAT Paramitha Eka Kumala Sari
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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In exploration process of epithermal deposit, it is important to understand alteration and mineralization. The presence of alteration and mineralization zones help development of ore mineral exploration. Hydrothermal alteration is change of the chemistry, physics, mineralogy and origin textures of rocks as it interacts with the hydrothermal fluid. Alteration and mineralization zones has characteristics and certain minerals in each area.The research purposes are to determine the geological conditions include morphology, lithology and geological structure, to know the type of alteration, and to know the characteristics of epithermal deposit in the research area. The research method consist of survey method and analysis method. Survey method was done by surface mapping. Analysis method include petrological analysis, petrographic analysis, mineragraphy analysis, ASD analysis (Analytical Spectral Devices) and geological structure analysis.Geomorphology of Sualan area is divided into two landforms are very steep volcanic mountains and rugged hilly volcanic landforms. Lithology consists of tuff breccia, andesite lava, banded tuff, intrusion of hornblende andesite, andesitic breccia and tuff. The geological structure is contained systematic joint that is have strike/dip N142°E/79° dan N257°E/81° in Cibaliung River, N291°E/64° dan N153°E/65° in Cibaliung Beet River and N337°E/53° dan N87°E/49° in Citutugan River and fault structures are left slip fault Cibaliung with pitch 3° and shear zone N 170°E/76°, right reverse slip fault Cibaliun Beet with pitch 70° and shear zone N 300°E/76°, reverse left slip fault Citutugan with pitch 33° and shear zone N 350°E/48°. This structure are formed at last Pliocene with main emphasis northwest-southeast. Alteration zones consists of chlorite-smectite ±illite alteration zone, propylitic alteration; kaolin-illite alteration zone, argillic alteration and quartz -kaolin-alunite±dickite alteration zone, advanced argillic alteration. Mineralization consist of disseminated pyrite and gold (Au) as ore minerals and oxide minerals such as jarosite, hematite and goetite that change acid mineral. It can indicate that it is included high sulphidation epithermal deposit .

REKONSTRUKSI STRUKTUR GEOLOGI DAERAH SUPIORI TIMUR – SELATAN, KABUPATEN SUPIORI, PULAU BIAK, PAPUA Fadlillah Rumanda; Wahju Krisna Hidajat; Fahrudin Fahrudin; Joko Wahyudiono
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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Papua and Papua New Guinea are had geology condition are very complex involving interaction between two plates, the Australian Plate and the Pacific Plate. New Guinea formed the result of the movement of oblique convergence (convergence oblique). The products of convergence are shrinkage and formed strike-slip structures and subduction which occur in Papua on 10 Ma. Sorendiweri Strait seen horizontal and vertical fault motion that separated the Biak Island and Supiori Island thar can be identified with the alignment on the satellite image.The purpose of this study was to determine the geological conditions in the study area, the pattern of structures, the main stress that formed the geological structure and reconstruct of geological structures in the study area. The Field research methods are field observation on Supiori track. Record the characteristics of the rock on each formation, measurement of geological structures such as bedding plane, joint and fault plane. Analysis methods such as analysis of alignment manually and visually interpreted on a satellite image DSM (Digital Surface Map). Stereographic analysis of geological structures, combining field data and analysis of alignment to determine the type of structure zone with rotated stress analysis and subsidiary structures method.Geological conditions consist of Oligocene clastic limestone Wainukendi Formation. and Miocene non-clastic limestones Wafordori Formation. Pattern geological structure on Wainukendi Formation., NE-SW normal faults, WSW-ENE strike-slip faults and NE-SW thrust fault. Wafordori Formation., NE-SW normal faults, NE-SW thrust fault. N-S trending major stress is the main primary stress, NE-SW and NW-SE sharpness trending are local stress. Reconstruction of geological structures of the study area began with N-S primary stress that formed E-W Maru reverse fault, NE-SW Soren sinisral fault and NW-SE Maruu, Yondonkir, Maryadori, Biniki dextral fault. The NE-SW trending secondary stress formed NW-SE Kepudari thrust fault, Yon reverse fault and Donkir reverse fault at south of the study area.

WELL LOG APPLICATION TO DETERMINE DISPOSAL ZONE OF OIL PRODUCTION WASTE, MENGGALA FORMATION, GHAITSA FIELD, CENTRAL SUMATRA BASIN Kenan Diponegoro
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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PT. Chevron Pacific Indonesia (PT. CPI) is one of the main operators of exploration and exploitation of oil and gas in the Central Sumatera Basin, Riau Province. One of the production field is Ghaitsa Field. Petroleum exploitation activities carried liquid waste, which the government requires PT. CPI to manage the liquid waste so as not to pollute the environment through the Oil and Gas Law No. 22 of 2001. Therefore, PT. CPI took the solution to diposal or injection wells for wastewater treatment. Research is underway to find the location of disposal wells in Ghaitsa Field. Foramations that are the focus of research is Menggala Formation because it has met the basic requirements of disposal locations. These requirements are unproductive formation of oil and is the deepest formation.In completing this final project, the methodology is divided into two, namely the descriptive and analytical method, which consists of primary data and secondary data. The analytical method performed well log analysis is the qualitative and quantitative petrophysical and subsurface mapping with primary data used includes 16 well log data, while secondary data include 3D seismic data and velocity models.Menggala Formation is composed by Sandstone dominated and shale inserts, the depositional environment based on GRN log electrofacies analysis is cylindrical patterns are interpreted as part of a braided fluvial (Kendall, 2003). Geological structures such as faults inversion develops in the southern part of the N-S direction, normal faults and shear faults in the central and northern parts of the N-S direction, and the anticline and a syncline with a NW-SE direction. Petrophysical analysis generate values average porosity is 23%, the value of the permeability of about 322 mD to obtain the value of the capacity of the reservoir volume 263,614,635.47 barrels of water with the recommended disposal wells are wells IW 1 is located at coordinates x: 195 and y: 570 at a depth of -2000 feet to -2300 feet.

PENENTUAN TIPE ALTERASI BERDASARKAN ANALISIS PETROGRAFI, MINERAGRAFI, DAN GEOKIMIA PADA DAERAH KASIMBAR, KABUPATEN PARIGI MOUTONG, PROVINSI SULAWESI TENGAH Ainul Fatayatis Salamah; Yoga Aribowo; Dian Agus Widiarso; Rinal Khaidar Ali
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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Hydrothermal alteration is a complex process, because it involves a change in mineralogy, chemistry and texture resulting from the interaction of hydrothermal solutions with rocks in its path on certain physico-chemical conditions (Pirajno, 1992). Hydrothermal processes in certain circumstances will result a collection of certain minerals known as the set of mineral or mineral assemblage (Guilbert and Park, 1986). One evidence of hydrothermal alteration is the appearance of veins that had level of metal minerals and it is also a change on the rock side, as found in Kasimbar District, Moutong Parigi Regency, Central Sulawesi province. In the area discovered the existence of gold in the alluvium sediments that are the result of weathering schist and quartz veining. Gold is found in alluvium sediments are secondary gold or placer gold. From the research that has been done, found gold in quartz veins trapped on phyllite rocks. This study was conducted to determine the lithology of the region, the study based on petrographic analysis, knowing the characteristics of the rock alteration found in the study area based on petrographic analysis mineragraphy, knowing the type of alteration that develops in the area of research, knowing mineralization contained in the study area. Research in Kasimbar District, Parigi Moutong Regency, Central Sulawesi Province was conducted by analyzing rock samples taken from the area. Analysis is conducted with the petrographic analysis, mineragraphy, lithology and geochemistry of the units located in the area.Based on the results of petrographic thin section analysis of rock samples, lithology contained in Kasimbar District, Parigi Moutong Regency, Central Sulawesi Province is phyllite, granite and gneiss. Alteration characteristics of the study area is known of the characteristics quartz veins, alteration minerals characteristics and metal minerals characteristics. Quartz veins in the study area was divided into two, namely quartz veins in granite and quartz veins in metamorphic rocks (parallel and cut foliation). Characteristic alteration minerals contained in the study area is chlorite, sericite, biotite, epidote and quartz. Mineralization characteristics of the region, is study of sulphide minerals such as pyrite, bornite, and enargite; iron oxide minerals such as magnetite and hematite and the mineral element in the form of native gold (Au). Type of alteration is developed in the research area of prophylitic alteration, potassic alteration, silicification alteration, and carbonization alteration. Type of mineral deposits research areas is high sulfidation epithermal deposits.

STUDI FASIES, BATIMETRI, LINGKUNGAN PENGENDAPAN, DAN SIKUENSTRATIGRAFI SUMUR ALAF#1 DAN SUMUR ALAF#154 LAPANGAN WSDA CEKUNGAN SUMATERA TENGAH BERDASARKAN DATA INTI BATUAN, LOG GAMMA RAY DAN BIOSTRATIGRAFI Nela Paramitha Rattyananda
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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The research area is located on the WSDA Field which is part of the Central Sumatra Basin and is composed of Tertiary sediments. Well Alaf#1 and Well Alaf#154 are two wells located on Field WSDA. In the sediments of the study area was found Sihapas Group (Bekasap Formation and Telisa Formation) which has a relatively abundant microfossils. Both of these formations are formed in the phase where there is a transgression that can be applied to the stratigraphy sequence analysis.This study has the objective to determine the depositional facies rocks based on the core data and the Gamma Ray log data, determine zoning, paleobathymetry, depositional environment based identification lithofacies, elektrofacies and biostratigraphy, and depositional dynamics stratigraphy sequence determine Alaf Well Alaf#1 and Well Alaf#154 WSDA Field of Central Sumatra Basin.The method used in this research is descriptive and analytical methods. Descriptive methods include case studies and literature. Analysis methods include deposition facies analysis, micropaleontology analysis and stratigraphy sequence analysis using rock core data, the data Log Gamma Ray and data biostratigraphy Well Alaf#1 and Well Alaf#154. From log data and core rock the data can be identified depositional facies. Then the elektrofacies data and litofacies the approach core to log and trace fossil analysis will be obtained depositional environment. Biostratigraphic data is used to determine zoning and paleobathymetry. Determination of the depositional dynamics stratigraphy sequence determine Alaf Well Alaf#1 and Well Alaf#154 obtained by pulling the stratigraphic marker based on microfossil data, calcareous nannoplankton, log pattern analysis and depositional facies analysis.Based on the litofacies, elektrofacies and biostratigraphy analysis, Well Alaf#1 and Well Alaf#154 have a range of Early Miocene age relative to the bathymetric range Litoral – Middle Neritic and have a tide dominated delta depositional environment. Results showed stratigraphy sequence interpretation cycle of sequence marked by a boundary looping are SB (Sequence Boundary) and MFS (Maximum Flooding Surface). Well Alaf#1 has 3 cycles sequence and Well Alaf#154 has 4 cycles sikuen. On the correlation stratigraphy sequence of Well Alaf#1 and Well Alaf#154, there are two cycles sequence, but only one complete cycle consisting sequence of SB2, HST (Highstand System Tract), MFS3, TST (Transgresive System Tract) then SB3. This is due to limit the scope of the study in the study area does not include all parts of the looping process that occurs in the study area.

KAJIAN POTENSI BAHAN GALIAN PASIR – KERAKAL DI SUNGAI BARO, KABUPATEN PIDIE, PROVINSI NANGGROE ACEH DARUSSALAM Januar Aziz Zaenurrohman; Dwiyanto Joko Suprapto; Fahrudin Fahrudin
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 necessity of sand gravel in the development is become larger along with the advance of economic and population growth. Baro river has big enough natural resources in the form of excavated materials such as sand and gravel. Because of that reason, the stock taking of sand and gravel materials is needed in Baro river to serve as reference for the Government about the potential of owned excavated materials. Study about the potential of excavated minerals in Baro river is done in the form of research such as surface geological mapping, geoelectric survey, test pit, measurements of potential spacious and volume, as well as economic analysis. From the above researches, the informations obtained are about the potential area of the minerals, the quality of sand – gravel materials through the laboratory test, and the economical feasibility.In the research location, there are found excavated materials in the form of sand – gravel with the potential area and volume that can be mined appropriated with the government regulation is about 2.997.319,15 m2. The volume of excavated materials is about 14.986.595 m3 with the depth of 5 meters. The result of laboratory test, the grain size is dominated by gravel and sand with the percentage of gravel is about 28,41% up to 66.53%, the percentage of sand is about 33.21% to 71,44%, and the percentage of silt and clay about 0.10% to 0.48%. According to loss angeles abrassion test, the maximum value is 43.70% and minimum value is 38,53%. As well as the results of soundness test, the maximum value is 0,239%, making the aggregate is very resistant to weathering process. In the economical analysis, the result of the NPV >0, BCR > 1, and IRR > MARR with the value about 7.5%, so that mean the location is recommended for mined economically.

ANALISIS KESTABILAN LERENG UNTUK PENANGANAN GERAKAN TANAH DENGAN METODE GROUTING DI PERUMAHAN BUKIT MANYARAN PERMAI (BMP) KOTA SEMARANG Yones Lenardo Angelo
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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Build an infrastructure must consider the aspects of geology in order to get maximum results. One of the geological aspects that must be considered is the condition of lithology. If the lithology is not sturdy, it will frequently moves or called landslide. This land movement can have negative impacts on existing communities in the vicinity.In this study, the author took the theme, slope stability analysis, which is located in Bukit Manyaran Permai Housing (BMP), Semarang. The housing have high intensity of damage due to soil movement. The housing is standing on ground that is dominated by clay. Clay has a low degree of friction angle and low cohesion so it will easily move if given more weight than the carrying capacity of the lithology.The methodology is using slope stability analysis computionally. The first step of research conducted by geotechnical mapping to determine the distribution of the existing surface lithology and clasify the damage of infrastructure caused by the movement of existing soil. Then drill in two different drill point where each point was drilled to a depth of 10 m. From the drilling results will be obtained samples to be used in laboratory testing, including unit testing and direct shear weight. From both test, the results will be obtained are the value of the unit weight, cohesion and friction angle which we can use for making modeling and computational search for the safety factor. In doing modeling and find the value of the safety factor of the location of the study authors using Slide 6.0 software which is very helpful in determining the value of the safety factor on the ground.From the computational analysis found that is worth the value of the safety factor of less than 1.5, it indicates the condition of the slopes of the potential occurrence of landslide. Therefore, at the end of this final report the authors provide proper recommendations handling of landslide in accordance with the results of laboratory analysis and the existing conditions in the field.

Studi Batuan Asal (Provenance) dan Diagenesis Batupasir Formasi Ngrayong Daerah Tempuran dan Sekitarnya, Kecamatan Medang, Kabupaten Blora, Jawa Tengah Faizal Abdillah
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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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.

STUDI PERHITUNGAN SUMBERDAYA BATUBARA PADA LAPISAN HANGING SEAM DAN SEAM UTAMA DENGAN METODE CIRCULAR DI DAERAH TOWNSITE DAN SEKITARNYA, TANJUNG ENIM, SUMATERA SELATAN Theodora Noely Tambaria
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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South Sumatra Basin consists of a variety of rock formations and there is a wide range of natural resources that can be developed, either at Muara Enim formation. At Muara Enim formations are sandstone and limestone unit with inset coal. Mapping based on Townsite and surrounding area, Tanjung Enim generally known in claystone unit obtained layers are less thick hanging seam, with a transitional sedimentary structures that characterize the upper delta plain leads more towards land. Whereas the tuff sandstone unit generally obtained main seam layer is thick enough to sedimentary structures that characterize the transitional upper delta plain leads more towards the sea. Coal resources used in the calculation method for calculation with circular because the circular method is to make the area of influence of the observation point, and then calculated the extent of influence of each region with coal limit and the work sheet area, the extent of each area multiplied by the thickness of the average seam being calculated, and multiplied by the density is in accordance with local circumstances which are still at the stage of preliminary exploration. Resource calculation performed on Townsite and surrounding area, Tanjung Enim with circular method known coal seam is hanging reserve 27,950,679.6 tons , while coal reserves are the main seam 129724447.5 tons. Based on the calculations have been made known to the main seam to be mined is more economical compared to hanging seam, but for the addition of hanging seam coal resources can be considered.

KAJIAN DAERAH RAWAN BENCANA ALAM GERAKAN TANAH BERDASARKAN ANALISIS FAKTOR PENGONTROL DI WILAYAH KECAMATAN CILONGOK, KABUPATEN BANYUMAS, JAWA TENGAH Henri Kusumayadi; Prakosa Rachwibowo; Wahju Krisna Hidajat
Geological Engineering E-Journal Vol 6, No 2 (2014): Wisuda Periode Juli - Oktober 2014
Publisher : Program Studi Teknik Geologi, Fakultas Teknik, Universitas Diponegoro

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Kecamatan Cilongok merupakan salah satu kecamatan di Kabupaten Banyumas yang berada di lereng selatan Gunung Slamet. Kecamatan ini memiliki daerah-daerah rawan bencana alam gerakan tanah yang dikontrol oleh faktor kondisi geologi (litologi), kemiringan lereng, dan tata guna lahan. Tujuan penelitian ini yaitu untuk mengetahui zona kerentanan gerakan tanah dan mengetahui cara untuk mengurangi gerakan tanah. Metode penelitian meliputi pengamatan lapangan yang dilanjutkan dengan metode analisis.Pengamatan lapangan meliputi pemetaan lokasi gerakan tanah dan pemetaan faktor-faktor penyebab gerakan tanah (litologi, kelerengan, dan tata guna lahan). Setelah melakukan pengamatan lapangan, data lapangan dianalisis sehingga menghasilkan peta geologi, peta kelerengan, peta tata guna lahan. Kemudian analisis dilanjutkan dengan melakukan pembobotan faktor-faktor pengontrol gerakan tanah dilakukan sehingga menghasilkan nilai bobot setiap faktor pengontrol. Langkah selanjutnya yaitu menumpangtindihkan (overlaying) ketiga peta faktor pengontrol (dengan nilai bobot masing-masing) sehingga menghasilkan peta tingkat kerentanan gerakan tanah.Berdasarkan peta tingkat kerentanan gerakan tanah, Kecamatan Cilongok dapat dibagi menjadi tiga zona tingkat kerentanan gerakan tanah, yaitu zona tingkat kerentanan tinggi (luas mencakup + 35% peta), zona tingkat kerentanan sedang (luas mencakup + 15% peta), dan zona tingkat kerentanan rendah (luas mencakup + 50% peta). Peta zona tingkat kerentanan gerakan tanah dapat digunakan untuk skala prioritas mitigasi bencana alam gerakan tanah berdasarkan zona tingkat kerentanan. Untuk mengendalikan gerakan tanah, dapat dilakukan tindakan yang tepat berdasarkan faktor pengontrol gerakan tanah di masing-masing daerah.

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