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Geological Engineering E-Journal
Published by Universitas Diponegoro
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Core Subject : Science,
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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PENINGKATAN DAYA DUKUNG TANAH URUGAN DENGAN METODE GROUTING DI SMK TEUKU UMAR SEMARANG, JAWA TENGAH Agnes Maria Mutiha Manalu
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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Abstract

It is very important to note in bearing capacity of soil in development of multi-storey buildings. There are somegeotechnical investigation can do to determine the value of bearing capacity of soil. One of them is cone penetration test.The location of three-storey building site SMK Teuku Umar, Karangrejo, Semarang has soils that dominated by clay.Soil located in the research area is quarry with low soil strength.The purpose of this research was determine the type ofsoil and the bearing capacity of soil in the areas of research, to know grouting method used to increase the strength ofsoil, to determine the bearing capacity of soil before and after grouting, and to know increasing the bearing capacity ofsoil from the work of grouting. The method used in this research is conducting geotechnical investigations in the formcone penetration test. This cone penetration test calculate the value of conus resistance on the subsurface with a certaindepth, then the results of the testing is done processing data to determine the value of bearing capacity of soil containedin the three-storey building site SMK Teuku Umar, Semarang, Central Java. The type of soil in research location isburial land which is dominated by clay to sandy silt. The value of bearing capacity of soil permits at cone penetrationtest’s point 1 before grouting >100 ton/m2 obtained at a depth of 6,4 m. After installing grouting, it found at a depth of3,6 m. At cone penetration test’s point 2, bearing capacity of soil permits before grouting >100 ton/m recentlyrecovered at a depth of 6,6 m. After installing grouting, has been found at a depth of 3,8 m. At cone penetration test’spoint 3, value of bearing capacity of soil permits is increased very high, at depth of 1,6 m has had bearing capacity ofsoil permits >100 ton/m2. Method of grouting has increased the value of bearing capacity of soil. 2
PENGARUH STRUKTUR DAN TEKTONIK DALAM PREDIKSI POTENSI COALBED METHANE SEAM PANGADANG-A, DI LAPANGAN “DIPA”, CEKUNGAN SUMATERA SELATAN, KABUPATEN MUSI BANYUASIN, PROVINSI SUMATERA SELATAN Ragil Pratiwi; Hadi Nugroho; Dian Agus Widiarso; Rana Lesmana
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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Abstract

The increasing of oil and gas and energy crisis nowadays has been causing the explorationist look forthe new energy sources such as gas in shale and coal which more environmentally friendly. SouthSumatera Basin is one of Indonesian Basin which has a large potency with 183 tcf. Methane gas isstored in natural fracture of coalbeds called cleat. Cleat was produced during coalification andtectonism process.The aim of this study is to evaluate the influence of structures and tectonism processes towards theCBM potency in an area. The research methods were done by desciptive and analysis methods.Descriptive method was done by describing secondary data which contain rock mass data, andanalyzing method was done by analyzing subsurface data consist of seismic and wireline log. Thosedata were used to determine the sweetspot area and calculate gas in place in target zone of CBM.Based on geologic structure analysis, primary orientation trends which configure geologic structuresis northeast-southwest, it is a Compression Phase of Miocene-Recent. This stress configured sincline,sinistral strike-slip fault, and normal faults in tensional phase. The interesting area of CBMexploration or sweetspot area located in the northeast area, with normal faults which control fracturepermeability reach 12,22 mD, high thickness reach 14 – 18 feet (4,7 – 6 meter), and CBM targetdepth of < 6000 feet (2000 meter), and gas in place calculation reach 0,742 tcf. Completiontechniques for CBM target in study area with relatively low permability are hydraulic fracturingcompletion and horizontal well with direction of well is relatively northeast-southwest whichperpendicular with face cleat. 
PENYELIDIKAN GEOLOGI TEKNIK UNTUK PENENTUAN LOKASI PEMBANGUNAN AS BENDUNGAN PELOSIKA DI DESA ASINUA JAYA, KECAMATAN ASINUA, KABUPATEN KONAWE, PROVINSI SULAWESI TENGGARA Sawung Kawedar Daya Kristy; Hadi Nugroho; Wahju Krisna Hidajat; Dandung Marhento
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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Abstract

Development plan of Dam Pelosika is located in a river Konaweha, Asinua Jaya village, Asinua District, Konawe, Southeast  Sulawesi  Province. Konaweha river has a length of 127 km and has an Regional water bin area of 6,664 km2.The purpose of this research is to study the geology around the River Konaweha to determine the condition of the morphology and lithology of the area so it can be recommended as dam Pelosika construction site of several alternative locations. Then determine the engineering geology condition of the selected location. In addition, determine the spread and water level inundation. The research method used was a descriptive survey method engineering geological mapping. The descriptive method is collecting secondary data from topographic maps, regional geological maps, earth maps and technical data of dams. While the analytical survey method is analyze the data based on the geological conditions of the regional geology and geological engineering investigation of the data included surface geological conditions, core drilling and test results of geoelectric. Based on investigation in the field, the morphological conditions of the studyis divided into three units namely structural denudated steep hills landform unit, denudated structural undulating hills landform unit and plains of fluviall and denudated form unit. The lithology of the study area is a constituent of metamorphic rocks such as schist of Paleozoic Metamorphic Formation, conglomerates and sandstones of Pleistocene age Alangga Formation and deposition of clay to gravel-sized Alluvium Holocene age. Based on several parameters geology and geological engineering, so that from several alternative locations as dam development determined that 4th alternative locations is a selected location for construction Dam Pelosika. The foundation of the dam on the left side at elevation +121 m rests on weathering soil bedrock sandy silt-sized. The foundation of the center of the dam at elevation +16.9 m rests on clay silt layers firm. The foundation of the right of the dam at elevation +115 m rests on weathering soil bedrock sandy silt-sized. The inundation spread area is 165.98 km2, constrained by the topography of the area around the river. Inundation water levels is +180 m.
STUDI FASIES FORMASI TANJUNG, SUB. CEKUNGAN BARITO UTARA, DAERAH BENANGIN, BINTANG NINGGI DAN SEKITARNYA, KABUPATEN MUARA TEWEH, PROVINSI KALIMANTAN TENGAH Gesang Panggrahito Pati
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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Abstract

Objek penelitian merupakan Formasi Tanjung yang termasuk bagian dari Cekungan Barito. Cekungan Barito Utara adalah salah satu cekungan yang sudah terbukti menghasilkan hidrokarbon di daerah Kalimantan Tengah. Salah satu yang menjadi target eksplorasi pada Sub-Cekungan Barito Utara adalah Formasi Tanjung yang berumur Eosen. Sedikitnya informasi dan penelitian mengenai karakter sedimentologi dari Formasi Tanjung menjadikan salah satu problem eksplorasi hidrokarbon di daerah ini.  Lokasi penelitian terletak di daerah Benangin dan sekitarnya, Kabupaten Muara Teweh, Provinsi Kalimantan Tengah. Luas lokasi penelitian adalah 300 km2.Tujuan dari penelitian ini adalah untuk mengetahui jenis-jenis dan karakter fasies dari Formasi Tanjung, mengetahui umur, bathimetri dan lingkungan pengendapan batuan, dan mengetahui arah tegasan utama yang mempengaruhi sedimen di Cekungan Barito bagian Utara.Metode Penelitian dilakukan dengan metode survei dan metode analisis. Metode chaining merupakan pemetaan batuan menerus, yaitu dengan melakukan stratigrafi terukur pada lintasan yang sudah ditentukan, dari masing-masing lintasan akan diikat (chain) dan dikorelasikan satu dengan yang lain. Metode analisis yang dilakukan adalah analisis petrografi dan analisi biostratigrafi.Secara umum Formasi Tanjung daerah penelitian dibagi menjadi 2 yaitu Formasi Tanjung bagian bawah (Lower Tanjung Formation) merupakan lingkungan pengendapan fluvial yang dipengaruhi oleh proses fluviatil di daerah Bintang Ninggi dan Formasi Tanjung bagian atas (Upper Tanjung Formation) lingkungan pengendapan delta yang dipengaruhi oleh proses fluvial dan tide secara dominan di daerah Benangin. Di daerah penelitian, Formasi Tanjung bagian bawah (Lower Tanjung Formation) terdiri dari beberapa Fasies yaitu : Fasies Sungai Teranyam (Braided River), Fasies Sungai Berkelok (Meandering River). Dan Formasi Tanjung bagian atas (Upper Tanjung Formation) terdiri dari 2 Fasies yaitu: Fasies Delta Plain yang tersusun dari Fasies Tidal Flat, Channel Fills, Distributary Channel, Flood Plain Deposite, Mouth Bar dan Fasies Delta Front yang tersusun dari Fasies Tidal Bar dan Distributary Mouth Bar. Maka lingkungan pengendapan Formasi Tanjung daerah penelitian adalah Lower Delta Plain -Delta Front yang didominasi oleh proses Fluvial & Tidal (Tide dominated delta front).
PENYELIDIKAN GEOLOGI TEKNIK UNTUK PEMBANGUNAN TANGGUL KALI LOROK PACITAN JAWA TIMUR Setiono Setiono; Dwiyanto Joko Suprapto; Wahju Krisna Hidajat
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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Abstract

Lorok river, Pacitan, East Java is one of the river is located in the south eastern part Pacitan. In this area often flooded due to overflow of river water discharge during the rainy season and at high tide the sea water so that it can be detrimental to the public around the area of research which is along the river flow Lorok. Therefore, the government will undertake the construction of a dike to overcome these problems.In the present study, namely on engineering geology investigation for the construction of levees on the river wall, which aims to determine the condition of the surface geology and subsurface engineering research sites, determine the feasibility of levee, giving advice and know the location, quantity and quality of borrow. So as to provide development planning parameters embankment at the study site.To carry out the construction of the embankment should be known geological conditions of the surface and subsurface techniques. The method used in this study is the investigation of the surface engineering geological and engineering geological mapping subsurface geothecnical investigation with core drilling methods, sondir test and test pit. Mapping of engineering geology carried out in the vicinity of the study. Core drilling carried out by 10 points the BH - 1, BH - 2, BH - 3, BH - 4, BH - 5, BH - 6, BH - 7, BH - 8, BH - 9, BH - 10 with the depth of each point 10 meters. Sondir test conducted by 10 points the SD - 1, SD - 2, SD - 3, SD - 4, SD - 5, SD - 6, SD - 7, SD - 8, SD - 9, SD - 10 with varying depths . In this research, the search pile material in a way to make a well test ( test pit ) by 2 points the TP - 1 and TP - 2. In this investigation will produce approximately engineering geology maps and cross sections of the river flow subsurface engineering geology around the flow of the river.Based on the results of the analysis of the data that had been collected earlier, the recommended embankment foundation planning on hard ground or on rocks. Engineering geology cross-section can show the bedrock or rock beneath the surface as well as the physical and mechanical properties of soil or rock that is on site research.
ANALISIS PETROFISIKA DENGAN METODE DETERMINISTIK DAN PROBABILISTIK SERTA PERHITUNGAN VOLUME HIDROKARBON DENGAN METODE WELL BASIS PADA SUMUR MG-04 DI STRUKTUR MUSI, CEKUNGAN SUMATERA SELATAN PT. PERTAMINA EP REGION SUMATERA Mega Sari; Hadi Nugroho; Wahju Krisna Hidajat; Oki Satriawan
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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Abstract

Well logging is a measurement technique to obtain the subsurface data using instrument inserted intowellbore, to evaluate formation and rock characteristics identification beneath the surface. Formation evaluationaims to identify zones of reservoir rock, formation fluid type, and to obtain petrophysical parameters of reservoirrocks such as shale volume, rock porosity, permeability, water saturation at the research area, the well MG-04 weredrilled in the Musi Structure, South Sumatra Basin, PT. Pertamina EP. The purpose of this research is identifying productive layer on an exploration well in Musi Structure, SouthSumatra Basin. In addition, to determine the value of petrophysical rock parameters which recorded in a log curvesgenerated during logging and calculating the volume of hydrocarbon in exploration well as a consideration, priorto further exploration and exploitation. This research using descriptive methods and petrophysical analysis. The descriptive method includesliterature study of the basics concept on determining rock petrophysical parameters to be used. The analyticalmethod using deterministic and probabilistic method to determine petrophysical parameters, also “well basis”method to calculate the volume of hydrocarbons. Based on wireline logs analysis, well MG-04 known has two reservoir zones, namely oil reservoir in zone 2and gas reservoirs in zone 4. In zone 2, the reservoir rock is shaly sandstone with little amount of glauconite. Inzone 4, the reservoir rock is limestone, so this is a necessary to analyze the shaly sandstone with different methodsto the interpretation of limestone to obtain the correct value of petrophysical parameters. After calculation ofpetrophysical parameters in deterministic and probabilistical way with “wet-clay” models, obtained two log plotmodels that have close values, and it is known that the oil reservoir in zone 2 not potential for production, but gasreservoir in zones 4 the potential to do exploitation/ production. After the interpretation of petrophysicalparameters, it is known in zone 4 has a net pay thickness 68.43 m, total porosity percentage 28.42 to 29.72%,effective porosity 25.57 to 26.32%, permeability 56376,2 mD, water saturation 13.49 to 15.35% and shale volume 5to 10.5%. After obtaining reservoir petrophysical parameters, next step is hydrocarbon volume calculation using the“well basis” method, supported by pressure build up (PBU). Based on this analysis, it is known that total volume ofgas in the reservoir hydrocarbon type is estimated at 5088.4 MMSCF.
Integrasi Log Sumur dan Seismik 2D Untuk Analisis Karakteristik Reservoir dan Menghitung Potensi Hidrokarbon Pada Formasi Tualang, Lapangan “SHANDORA”, Cekungan Sumatera Tengah Ibnu Dwi Bandono Wahyudi; Hadi Nugroho; Yoga Aribowo; Radig Wisnu Yuwono
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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Abstract

Minyak dan gasbumi masih menjadi kebutuhan energi primer meskipun saat ini mulai banyak pengembangan energi alternatif. Produksi minyak bumi yang semakin menurun namun produksi gas semakin meningkat setiap tahunnya karena lapangan migas di Indonesia lebih banyak menyimpan gas. Daerah penelitian terletak pada Lapangan “SHANDORA”, Cekungan Sumatera Tengah dengan target reservoir adalah Formasi Tualang.Metode penelitian yang digunakan adalah metode deskriptif, dan metode analisis. Dari metode tersebut, kemudian dilakukan tahap analisis dan interpretasi dengan data penunjang yaitu data seismik 2D dan data log sumur. Kegiatan yang dilakukan antara lain menganalisis dan menginterpretasi litologi, mengkorelasi antar sumur, menganalisis fasies dan lingkungan pengendapan, menghitung parameter petrofisika, menginterpretasi seismik, memetakan kondisi bawah permukaan, dan menghitung cadangan hidrokarbon. Perangkat lunak yang digunakan untuk menunjang studi Tugas Akhir ini adalah Petrel, GSv5.1, dan SMT Kingdom.Dari hasil analisis data yang telah dilakukan, dapat diinterpretasikan bahwa Formasi Tualang merupakan kumpulan seri serpih, batupasir dan lapisan tipis batugamping. Analisis elektrofasies pada Formasi Tualang menunjukkan bahwa Formasi ini terendapkan di lingkungan Shoreface (Regressive to Transgressive) – Shelf. Target batuan reservoir pada Formasi Tualang adalah lapisan batupasir TS-2 dan TS-5. Lapisan batupasir TS-2 dan TS-5 merupakan lapisan batupasir dengan karakteristik volume serpih berkisar 8,44% - 24,67%, porositas berkisar 15% - 25%, saturasi air berkisar 26,93% - 37,24%, dan permeabilitas berkisar 2,1 mD – 46 mD. Berdasarkan hasil perhitungan cadangan volumetrik pada lapangan “SHANDORA” didapat cadangan gas mencapai 17,90 BCF dan gas yang dapat diproduksi mencapai 10,74 BCF dengan nilai recovery factor 60%. Keberadaan hidrokarbon di Formasi Tualang tidak lepas dari pengaruh tektonik yang terjadi di Cekungan Sumatera Tengah yang menghasilkan pola struktur geologi berarah baratlaut – tenggara. Pada daerah penelitian, hidrokarbon terakumulasi di perangkap reverse-faulted anticline dan flank pinchout.
ANALISIS GEOKIMIA FLUIDA UNTUK PENENTUAN POTENSI SUMBERDAYA PANASBUMI LAPANGAN ZW, KABUPATEN GARUT, PROVINSI JAWA BARAT Wirga Zulwidyatama
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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Abstract

Daerah Lapangan panasbumi ZW terletak pada Provinsi Jawa Barat menunjukkan keadaan Geologi yang memungkinkan untuk terdapatnya sumberdaya panasbumi. Posisinya terletak pada jalur pegunungan api sehingga memungkinkan terbentuknya suatu sistem panasbumi. Pada daerah ini ditemukan manifestasi panasbumi berupa mataair panas dan fumarol. Kimia fluida di daerah panasbumi mengandung informasi penting mengenai kondisi reservoir, sehingga dilakukan anilisis kimia fluida untuk menentukan karakteristik geokimia dan potensi sumberdaya dari lapangan panasbumi ZW.Metode yang digunakan dalam penelitian ini adalah metode deskriptif dan analisis dari data kimia fluida panabumi. Hasil data diperoleh dari pengambilah 5 contoh air panas dari 12 manifestasi yang muncul disekitar lokasi penelitian. Contoh air panas yang diambil berasal dari mataair panas Cipayung, Citeduh, Cibeuning, Siun dan kawah Basah.Berdasarkan hubungan rasio unsur kimia dan plotting pada diagram segitiga Giggenbach (Giggenbach, 1988) terhadap suatu sistem panasbumi, Berdasarkan analisis sifat fisik dan analisis geokimia maka Manifestasi Kawah Citeduh, Cipayung, kawah Basah dan Cibeuning berada pada zona upflow. Sedangkan Mataair Panas Siun berada pada zona outflow (Nicholson, 1993). Dalam pengeplotan diagram segitiga Giggenbach (Giggenbach, 1988)  juga menunjukkan informasi bahwa Mata air Citeduh merupakan mata air Sulphat, Mataair Siun merupakan air Bikarbonat. Sementara kawah Cipayung, Cibeuning dan Basah memiliki sampel yang encer sehingga analisis geoindikator tidak valid. Berdasarkan perhitungan Geothermometer Gas yang digunakan, temperatur reservoir panasbumi lapangan ZW adalah 246,6oC, Termasuk dalam sistem panasbumi berentalpi tinggi (Hochstein, 1990). Adapun potensi berdasarkan perhitungan panas yang hilang/heat loss secara Konveksi adalah 49,2 MWe. Sementara dari perhitungan dengan metode volumetrik adalah 625,5 MWe, memungkinkan untuk dilakukan eksplorasi lebih lanjut sehingga dapat dimanfaatkan sebagai pembangkit listrik dan pemanfaatan langsung.
Analisis Potensi Shalegas Formasi Tanjung Cekungan Barito, Kalimantan Selatan Menggunakan Data Petrografi, SEM, Geokimia, XRD, dan Seismik 2D Faisal Farizi
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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Abstract

The world's 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 government's 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.     
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 : Program Studi Teknik Geologi, Fakultas Teknik, Universitas Diponegoro

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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. 

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