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Geological Engineering E-Journal
Published by Universitas Diponegoro
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Earth & Planetary Sciences
Geological Engineerinb E-Journal menerima artikel-artikel yang berhubungan dengan Geologi Umu, Geologi Migas, Geologi Teknik, Panasbumi, dan Air Tanah.
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Articles 170 Documents
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PEMODELAN GEOLOGI DAN PERHITUNGAN CADANGAN HIDROKARBON PADA FORMASI GUMAI SERI G-50 LAPANGAN “MALIKA” DENGAN MENGGUNAKAN DATA SUMUR DAN PSEUDO 3D PROVINSI JAMBI, CEKUNGAN SUMATRA SELATAN Syahnazaina, Syahnazaina
Geological Engineering E-Journal Vol 5, No 2 (2013): Volume 5, Nomor 2, Tahun 2013
Publisher : Geological Engineering E-Journal

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Abstract

MALIKA field located in the Sub - Basin Formation Gumai Jambi , South Sumatra Basin. Geological modeling in this field as an effort in the development field. Application of geological modeling knowledge is now growing rapidly along with the development of software based geology and geostatistics .Geological modeling is purpose to see reservoir characterization from facies geometry patterns , and see the spread of the distribution of porosity, permeability, VSH and Net To Gross ( NTG ) were validated with facies distribution. Value of each property from petrophysical are used to calculate  existing reserves  for reservoir simulation purposes.Modelling on malika field use pseudo 3d, because and  3D modellling correction values higher than 2D. Analysis sequen stratigraphy purposed for determine facies on Malika field. analysis sequen stratigraphy purposed for determine facies on Malika field, whereas  petrophysical properties distribution conducted through from geostatistical approach with use variogram on petrel. For make a model distribution through the creation of as many as 10 realization of the facies distribution, porosity distribution,  VSH distribution and  Net To Gross (NTG). Realization of each model is made in the form of rankings, realization purpose to provide value not too pessimistic nor optimisticFrom sequen stratigraphy, Malika field have 5 zones reservoir sand, that is G-50A(4950-5120ft), G-50B (5035-5170ft), G-51 (5090-5312ft), G-52A (5177 -5353ft) dan G-52B (5221-5430ft). Depositional environment on the shelf until the delta , with reservoir thickness 40–72ft. Volume porosity in each zone has a value ranging from 182 643 ( 103 acre.ft )  and Original Oil In Place ( OOIP ) 192.727.521 .103 STB. 
Analisis Potensi Shalegas Formasi Tanjung Cekungan Barito, Kalimantan Selatan Menggunakan Data Petrografi, SEM, Geokimia, XRD, dan Seismik 2D Farizi, Faisal
Geological Engineering E-Journal Vol 5, No 1 (2013): Volume 5, Nomor 1, Tahun 2013
Publisher : Geological Engineering E-Journal

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The worlds needs for oil and gas continues to increase with the progression of human development and the number continues to increase. However, existing reserves may not be reliable in the future if there is no discovery of new reserves or  expansion  into the area of unconventional reserve. One of the Indonesian governments policy is to increase exploration and production of non-conventional oil and gas reserves such as shale gas to get large amounts of gas reserves. There are several formations that have been targeted in shalegas exploration in Indonesia. This research focus at Tanjung Formation as object.  Tanjung formation has about 100 meters thick of shale and buried  more than  at a depth of 2000 meters. This research aim for identify potential of shale gas at Tanjung Formation which located in the basin Barito, South Kalimantan.Research methods used include survey methods, descriptive methods, and methods of analysis. In this study we used the analysis of petrographic, geochemical, SEM (scanning electron microscopy), XRD for surface samples and analysis of 2D seismic for dasubsurface data. In this study, we did integration surface and subsurface data.  Surface sample from surface data is used to analog subsurface sample in tanjung formation to make a history of burial model. Petrographyc analysis show main porosity is dissolution and fracture, main organic material is fragmental and streak. SEM show mineral that have conviguration to creat microporosity, that minerals are illite and pyrite. XRD analysis show main mineral compose Tanjung shale is quartz (42-79%) and BI (Brittleness Index) value betwen 0,6-0,83. Based on Maturation history modeling of pseudowell-1 is known that the generation of hydrocarbons (gas) starts at 8 million years ago at a depth of 15 000 feet. Based on ambrose equation, Recoverable resources gas at tanjung shale is 18,425 TCF.     
ANALISIS PENGINDERAAN JAUH UNTUK MENENTUKAN DAERAH BAHAYA DALAM RANGKA MENDUKUNG UPAYA MITIGASI BENCANA GUNUNGAPI DENGAN MENGGUNAKAN CITRA DEM DAN LANDSAT DAERAH GUNUNG BATUR KABUPATEN BANGLI PROVINSI BALI Bashori, Imron
Geological Engineering E-Journal Vol 5, No 2 (2013): Volume 5, Nomor 2, Tahun 2013
Publisher : Geological Engineering E-Journal

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Abstract

Indonesia merupakan negara dengan jumlah penyebaran gunung berapi yang sangat banyak,mengingat letaknya berada pada jalur cincin api (ring of fire). Salah satunya adalah GunungBatur. Dalam peraturan Menteri ESDM, Gunung Batur yang letaknya secara geografis padaKabupaten Bangli terletak pada posisi 8°11′ – 8°18’ LS dan 115°18′ – 115°27′ BT, menempatiposisi 20 dalam indeks rawan bencana letusan gunungapi.Penelitian ini bertujuan untuk melakukan prores upaya mitigasi bencana gunungapi denganmenentukan kawasan rawan bencana dan hubungannya dengan penggunaan lahan kawasanGunung Batur.Analisis klasifikasi bentuklahan dan penutup lahan dengan menggunakan metode penginderaanjauh secara visual. Hasil analisis bentuklahan citra DEM dibagi kedalam tujuhbelas bentuklahan(landform), yaitu: bentuklahan asal laut dan pantai disimbolkan dengan M yaitu Dataran PasangSurut (M4) dengan luas wilayah 2993 Ha, bentuklahan struktural sebanyak 3 disimbolkan denganhuruf (S) meliputi : Perbukitan Bergelombang Terlipat Kuat (S1), Perbukitan Blok Sesar (S3),Dataran Bergelombang Terlipat Lemah (S4), dengan luas wilayah 13319 Ha dan bentuklahanvulkanik dengan huruf (V) sebanyak 13 unit meliputi: Lubang Kepundan (V1), Lereng GunungApi (V5), Medan Lava (V6), Dataran Fluvio Vulkanik Berbukit Datar (V9), Dataran FluvioVulkanik Berombak (V10), Dataran Fluvio Vulkanik Berbukit Rendah (V11), Kipas FluvioVulkanik (V12), Tebing Kaldera (V14), Danau Kaldera (V15), Bukit Parasiter Vulkanik (V17),Kerucut Vulkanik (V26), Kerucut Parasiter (V27), Dataran Kaldera (V28), dengan total luaswilayah 65078 Ha. Hasil analisis penggunaan lahan yang didapatkan pada penelitian ini meliputi8 kelas, antara lain (1) Perairan 1673,341 Ha; (2) Hutan 30201,388 Ha; (3) Lahan Terbuka9455,038 Ha; (4) Padang Pasir 1921,216 Ha; (5) Kawah 66,639 Ha; (6) Permukiman 13584,021Ha; (7) Pertanian 25863,64 Ha dan (8) Aliran Sungai 2255,475 Ha. masing – masing klasifikasidilakukan penilaian (skoring) yang kemudian dilakukan overlay sehingga menghasilkanhubungan penggunaan lahan terhadap kawasan rawan bencana.Hasil skoring penggunaanlahan dan kawasan rawan bencana menghasilkan tiga daerah bahayagunungapi yaitu: kawasan rawan bencana tinggi (11914 Ha), kawasan rawan bencana sedang(18944 Ha) dan kawasan rawan bencana rendah (53384 Ha). 
IDENTIFIKASI STRUKTUR GEOLOGI DENGAN GEOLISTRIK METODE SCHLUMBERGER STUDI KASUS SEBAGIAN SISI UTARA KAMPUS UNIVERSITAS DIPONEGORO TEMBALANG Prasetyo, Sigit
Geological Engineering E-Journal Vol 5, No 1 (2013): Volume 5, Nomor 1, Tahun 2013
Publisher : Geological Engineering E-Journal

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Abstract

Geoelectric (resistivity) is a geophysical method used to determine the condition or the subsurface geological structures based on the variation of the resistivity rock. What the research lies in the northern part UNDIP Tembalang campus, located on Kaligetas Formation (Qpkg) lithological units composed of volcanic breccia, lava flows, tuffs, tuffaceous sandstone and mudstone. At the study site found the scarp and alignment springs. The condition is likely due to the influence of geological structures formed. The purpose of this study was to determine the subsurface lithology types and  kinds of geological structures based on the measurement results Schlumberger geoelectric method.The method used in this study is geoelectric schlumberger method. Geoelectric measurements carried out by 16 points spread among the sites. Geoelectric data processing to determine the actual value of resistivity and thickness of each layer using software IPI2win.Based on the results of data processing geoelectric resistivity values obtained in the study area in the form of rock mudstone (≤ 15 Ωm), sandy mudstone (16-45 Ωm), sandstones (46-100 Ωm), and volcanic breccia (> 100 Ωm). The results of the resistivity values and correlated geoelectric section is to analyze the structural phenomenon which occurs in the study area. In correlation A - A (UNDIP 3, UNDIP 13, and UNDIP 15) mudstone layer located at a depth of 55 meters in cross UNDIP 3, has increased to lie at a depth of 9 meters in cross section UNDIP UNDIP 13 and 15. In correlation C - C (UNDIP 4, UNDIP 2, and UNDIP 16) mudstone layer located at a depth of 62 meters in cross UNDIP 4, has increased to lie at a depth of 11 meters in cross UNDIP 2 and located at a depth of 2.4 meters in cross UNDIP 16. From the results of which showed increased geoelectric mudstone layer, it can be analyzed that the geological structure in the area of research in the form of faults (fault), the type of reverse faults, the south is part of a down (foot wall), while the northern part is relatively rise blocks ( hanging wall). With the direction of fault trending northwest - southeast
STUDI STRATIGRAFI DAN PALEOGEOGRAFI ENDAPAN KENOZOIKUM CEKUNGAN SENGKANG PADA DAERAH KABUPATEN MAROS, PROVINSI SULAWESI SELATAN Putra, Hendry Tri Pradipta; Nugroho, Hadi; Aribowo, Yoga; Irawan, Danny
Geological Engineering E-Journal Vol 5, No 1 (2013): Volume 5, Nomor 1, Tahun 2013
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Stratigraphy and paleogeography study basin sengkang never discussed in detail by earlier researcher, caused by pattern sequence stratigraphy this basin is difficult is determined disturbed consequence by activity tektonic mobile in Paleogen and Neogen. The mentioned that make as object that interesting to studied and studied furthermore.Watchfulness method is done with research method, descriptive method, and analysis method. Research method is done with direct quest at field, this descriptive method is done with describe field data and laboratory data, and analysis method is done with analyze litostratigraphy, biostratigraphy, sequence stratigraphy, and tektonostratigraphy the result is used for discussion syntheses paleogeography watchfulness region.Litostratigraphy watchfulness region is divided to be four rock formations with sequence the position from old to young, that is Mallawa Formation aged Middle Eocene, Tonasa Formation aged Early Miocene, Camba Formation with age turn Late Miocene, and Walanae Formation with age turn Pliocene. From formation, knowable ten species foraminifera planktonic as age areas biostratigraphy, that is Globigerapsis index as datum age zone P.11, Globigerina yeguaensis as datum age zone P.12, Orbulinoides beckmanni as datum age zone P.13, Globigerinoides immaturus as datum age zone N.4, Globoquadrina dehiscens as datum age zone N.5, Orbulina bilobata as datum age zone N.6, Globigerinoides diminutus as datum age zone N.7, Praeorbulina glomerosa as datum age zone N.8, Globigerinoides conglobatus as datum age zone N.18, and Globorotalia crassaformis as datum age zone N.19. Sequence stratigraphy watchfulness region consists of three sequence precipitation that consist of three packages system tract complete, that is highstand system tract, transgressive system tract, and lowstand system tract. Tektonostratigraphy sediment Kenozoikum watchfulness region, got four sequence, that is syn-rift, sag-basin, syn-orogenic, and post-orogenic. History paleogeography watchfulness region since Middle Eocene still environment land-deltaic with precipate formation unit mallawa, then in miosen beginning happen phase transgresi with precipate Mallawa Formation, and Late Miocene to happen regression phase with precipate Camba Formation, and phase transgresi return to happen by the end of Pliocene beginning with precipate Walanae Formation.
HUBUNGAN KONDISI GEOLOGI TERHADAP ALTERASI DAN MINERALISASI ENDAPAN EPITHERMAL DAERAH SUALAN, KECAMATAN TALEGONG, KABUPATEN GARUT, PROVINSI JAWA BARAT Kumala Sari, Paramitha Eka
Geological Engineering E-Journal Vol 5, No 2 (2013): Volume 5, Nomor 2, Tahun 2013
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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 .
Analisis Kestabilan Lereng pada Perencanaan Pembangunan Tanggul Kali Semarang, Jawa Tengah Pradana, Bayu Arga
Geological Engineering E-Journal Vol 5, No 1 (2013): Volume 5, Nomor 1, Tahun 2013
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Indonesia is a mostly country who have a mass movement disasters. These disasters are common in many areas, especially during the rainy season. This study aims to determine the safety factor of the slope value at the location so it can be seen from geotechnical reconstruction methods necessary for planning the construction of the embankment will be done on one time, Semarang.The research method used is descriptive and experimental methods. Slope stability analyzes performed using computational methods using software GeoStudio 2007, which then conducted an experimental method to simulate the value of cohesion on improving safety factor (Fs).From field observations and analytical results, the type of ground motion that can occur in the form of research creep, which is triggered by the huge burden of the activities of the local community and the load of the Kali Semarang have a large discharge and high during the rainy season.Based on the analysis of slope stability, slope conditions has a value of 0.809 with a safety factor of cohesion to the clayley sand layer 5.89 kPa and 8.92 kPa in clay layer. The simulation results obtained are a great value for the safety factor (Fs) 1.786 where the results are worth the value of cohesion at 15.89 kPa clayley sand and the clay has a cohesion value of 18.92 kPa, indicating that the slope is said to be secure and stable against mass movement must have increased the value of ± 10 kPa cohesion. Grouting method is an effective method to increase the value of cohesion in the rock form’s.In planning the embankment to be performed on site execution of the research required cutting slopes up to ± 90 °, the situation is then carried out two ground reinforcement methods that do the grouting method to increase the value of cohesion so that the constituent rocks have a high carrying capacity, and the execution of the sheetpile installation method will make retaining wall at the edge of the Kali Semarang make it strong andout construction of safe and effective.
WELL LOG APPLICATION TO DETERMINE DISPOSAL ZONE OF OIL PRODUCTION WASTE, MENGGALA FORMATION, GHAITSA FIELD, CENTRAL SUMATRA BASIN Diponegoro, Kenan
Geological Engineering E-Journal Vol 5, No 1 (2013): Volume 5, Nomor 1, Tahun 2013
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Abstract

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.
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 Rattyananda, Nela Paramitha
Geological Engineering E-Journal Vol 5, No 1 (2013): Volume 5, Nomor 1, Tahun 2013
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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. 
STUDI PERHITUNGAN SUMBERDAYA BATUBARA PADA LAPISAN HANGING SEAM DAN SEAM UTAMA DENGAN METODE CIRCULAR DI DAERAH TOWNSITE DAN SEKITARNYA, TANJUNG ENIM, SUMATERA SELATAN Tambaria, Theodora Noely
Geological Engineering E-Journal Vol 5, No 2 (2013): Volume 5, Nomor 2, Tahun 2013
Publisher : Geological Engineering E-Journal

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Abstract

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.

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