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EVOLUSI TEKTONIK DI DAERAH NENAS DAN KEFAMENANU, NUSA TENGGARA TIMUR IMPLIKASINYA TERHADAP POTENSI PERANGKAP (TRAP) HIDROKARBON PADA CEKUNGAN TIMOR BAGIAN BARAT Alfiansyah, Arif; Nugroho, Hadi; Fahrudin, Fahrudin; Wahyudiono, Joko
Geological Engineering E-Journal Vol 6, No 1 (2014): Volume 6, Nomor 1, Tahun 2014
Publisher : Geological Engineering E-Journal

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

REKONSTRUKSI STRUKTUR GEOLOGI DAERAH SUPIORI TIMUR â SELATAN, KABUPATEN SUPIORI, PULAU BIAK, PAPUA Rumanda, Fadlillah; Hidajat, Wahju Krisna; Fahrudin, Fahrudin; Wahyudiono, Joko
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.Â

Geokimia Batuan Gunungapi di Pulau Timor Bagian Barat dan Impikasi Tektoniknya Wahyudiono, Joko; Safri, Ildrem; Panggabean, Hermes
Jurnal Geologi dan Sumberdaya Mineral Vol 17, No 4 (2016): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

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Geologi wilayah Timor bagian barat berasal dari tiga mintakat yaitu Mintakat Benua Australia, Mintakat Busur Banda dan batuan yang terendapkan setempat. Pengambilan dan analisis conto batuan di Sungai Fatu dan Kompleks Mutis serta tambahan data sekunder dari Sungai Metan, Pulau Atauro dan batuan hasil Deep Sea Drilling Project (DSDP) bertujuan untuk mengetahui batuan asal wilayah Timor berdasarkan data geokimia batuan gunungapi dan implikasi tektoniknya. Metodologi analisis geokimia yang digunakan adalah X-ray fluorescence (XRF) dan Inductively Coupled Plasma–Mass Spectrometry (ICP-MS) untuk mengetahui unsur utama, unsur jejak dan unsur tanah langka dari batuan gunungapi. Unsur-unsur ini digunakan untuk klasifikasi batuan dan lingkungan tektoniknya.Hasil analisis geokimia conto batuan gunungapi dari Sungai Fatu dan DSDP berasal dari Benua Australia, sementara conto batuan dari Kompleks Mutis dan Sungai Metan menunjukkan Benua Asia atau Busur Banda seperti pada Pulau Atauro. Batuan basal dari Sungai Fatu terendapkan menjemari dengan batugamping Formasi Maubise berumur Perem dan merupakan Oceanic Island Basalt. Batuan basal dari Deep Sea Drilling Project (DSDP) secara geokimia termasuk subalkalin yang berasal dari pematang tengah samudera (Normal Mid Oceanic Ridge Basalt) berumur Jura.Kompleks Mutis pada Oligosen Miosen mengawali kolisi antara Benua Asia dengan Benua Australia. Batuan metabasal Kompleks Mutis menunjukkan komposisi kalk-alkalin yang mencirikan busur kepulauan. Conto batuan dari Sungai Metan dan Pulau Atauro terutama menunjukkan komposisinya subalkaline. Puncak kegiatan kolisi terjadi pada Akhir Miosen – Awal Pliosen dan berlanjut hingga sekarang. Busur Banda bagian dalam sebagian gunungapinya sudah tidak aktif lagi seperti yang terjadi pada Pulau Atauro.Kata kunci : geokimia, batuan gunungapi, mintakat, tektonik, kolisi, Timor

Karakteristik Petrologi dan Geokimia Batuan Gunungapi Berumur Oligosen Akhir - Miosen Di Daerah Gunung Muro, Kalimantan Tengah Wahyudiono, Joko
Jurnal Geologi dan Sumberdaya Mineral Vol 18, No 2 (2017): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

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Mount Muro is located in Purukcahu District of Central Kalimantan and geologically dominated by Late Oligocene-Miocene volcanic rocks. The purpose of this research mainly to understand the geodynamic evolution, including rock type, magmatic suites and tectonic environment during Late Oligocen to Miocene of the research area. Eight samples from that region were collected and prepared for petrographic and geochemistry analyses. Petrography analysis using polarization microscope was carried out for rock classification, whereas XRF and ICP were used mainly to detect the presence of major, trace and rare earth elements. Based on petrographic analyses the eight rock samples studied can be classified into basalt, andesite-basalt and diorite. Cross plot of weight percent SiO2 versus weight percent (Na2O + K2O) revealed that the rocks are differentiated into basalt, andesite-basalt, basalt trachy-andesite to andesite. The weight percent SiO2 versus weight cross plot percent K2O demonstrated that rocks samples of the studied area included in calc-alkaline magmatic series. This implies that the rock samples were originally from a convergent plate margin tectonic environment. The existence of Nb through in the spider diagram has been explained in terms of retention of this element in the source during partial melting. Keywords: petrology, geochemistry, tectonic, geodynamics, magmatic series

Karakteristik Minyak Bumi di Blok Bula dan Blok Oseil, Pulau Seram, Maluku Wahyudiono, Joko; Adlan, Ryandi; Permanadewi, Sam; Gibran, Akhmad Khahlil
Jurnal Geologi dan Sumberdaya Mineral Vol 19, No 4 (2018): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

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Oil that produced in a petroleum system must have specific characteristics depend on the source rocks. These characteristics are able to be understood by analyses of organic geochemistry. Gas Chromatography - Mass Spectrometry (GC-MS) is a very accurate tool for determining the characteristics of oil and gas. This research shows the evidence that oil samples taken from Bula Block and Oseil Block, Seram Island have the same source.Keywords: petroleum system, organic geochemistry, Bula, Oseil, Seram Island

KONTROL STRUKTUR PADA POLA “ZIG-ZAG” ALIRAN SUNGAI KAYAN DI DAERAH PESO, KALIMANTAN TIMUR Baharuddin, Baharuddin; Wahyudiono, Joko
Jurnal Geologi dan Sumberdaya Mineral Vol 17, No 3 (2007): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Peso Area is situated at the downstream of Kayan River, East Kalimantan. The area is generally occupied by a flysch-type deposit of Cretaceous Rajang-Embaluh Group. The unit is unconformably overlain by the Tertiary Sediments and is intruded by the Tertiary-Quaternary magmatics. Based on interpretation of landsat imagery, lineament features which represent faults can be traced outside the studied area. Based on landsat imagery data and result of joints, fault and fold analyses, it can be concluded that the zig-zag pattern of the Kayan River at Peso area is closely related to major faults movements. These faults are generally trending NE- SW and NW-SE. Keywords : structural control, zig-zag patterns, Kayan River

Rock-Eval Characteristic of Oligosen Fine-grained Sedimentary Rocks from Pamaluan Formation, Gunung Bayan Area, West Kutai Basin, East Kalimantan : Implication for Hydrocarbon Source Rock Potential Zajuli, Moh. Heri Hermiyanto; Wahyudiono, Joko
Jurnal Geologi dan Sumberdaya Mineral Vol 19, No 2 (2018): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

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In this study, we apply organic geochemistry analysis for evaluating source rocks in Gunung Bayan Areas, West Kutai Basin. Subject of this research are Oligocene fine-grained sedimentary rocks of Pamaluan Formation on Gunung Bayan Areas. The Oligosen fine-grained sedimentary rock of Pamaluan Formation consists of shale, siltstone and claystone. The organic geochemistry analysis includes pyrolysis data as total organic carbon(TOC%), generating source potential (S2), production index (PI), oxygen and hydrogen indices(OI, HI) and (Tmax). The results show that the Oligocene source rocks have poor into good quality with type III kerogen and have true capability to generate gas. The source rocks candidate is characterized by HI 5 - 115 (mg/g), TOC from 0.19 to 1.78 wt%, S1 from 0.01 to 0.09 (mg/g) and S2 from 0.05 to 1.74 (mg/g) that indicating poor to fair source rocks with type III kerogen and capable of generate gas. The maturity of the fine-grained sedimentary rocks tend to indicate immature to mature stage. Overall fine-grained sedimentary rocks of Pamaluan Formation has capability to produced gas with poor to fair quality.

Aspek Petrografi Batugamping di Daerah Timor Tengah Selatan Maryanto, Sigit; Permana, Asep Kurnia; Wahyudiono, Joko
Jurnal Geologi dan Sumberdaya Mineral Vol 19, No 2 (2018): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

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Microfacies and diagenetic aspects of limestones in the South Central Timor, East Nusa Tenggara have studied to investigate the deposition mechanism of the rocks and history of geological process after the rocks deposition. The cropped out of limestones in the research area includes into four rock units, are Aitutu Formation from Triassic, Nakfunu Formation from Early Cretaceous, Menu Formation from Late Cretaceous, and Ofu Formation from Paleogene. Limestone petrography analysis have been done on eighteen samples from the Aitutu Formation, fourty two samples from the Nakfunu Formation, nineteen samples from the Menu Formation, and seven samples from the Ofu Formation. Based on the study of limestones mikrofasies and diagenesis that has been done, proved are the fourth formation could be act as a source and reservoir for hydrocarbon. Keywords: Limestone, petrography, microfacies, diagenetic, hydrocarbon

POLIDEFORMASI PADA BATUAN KELOMPOK EMBALUH-RAJANG DI DAERAH BHAYANGKARA, KALIMANTAN TIMUR Wahyudiono, Joko; Baharuddin, Baharuddin
Jurnal Geologi dan Sumberdaya Mineral Vol 21, No 5 (2011): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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The Embaluh-Rajang Group in Bhayangkara region had suffered polyphase deformation. Regional fold shown in Landsat Imagery exhibit at least three periodes of deformation on the study area. The first deformation D1 main principal stress (s11) was directed relatively to east-west and resulted regional folds on the north-south direction. The second deformation D2 main principal stress (s12) was directed relatively to northwest-southeast and formed northeast-southwest trending regional folds. The third deformation D3 main principal stress (s13) was directed relatively to east northeast-west southwest and resulted local folds on the north northwest-south southeast trending direction. Faults occurred in study area could be classified into six main groups. They are fault group of A (north-south), B (north northeast-south southwest), C (northeast-southwest) and D (southeast-northwest), E (south southeast-north northwest).Keywords : polydeformation, fold, fault, regional structure

Model Fasies Batuan Karbonat Formasi Wainukendi di Cekungan Biak-Yapen, Papua Permana, Asep Kurnia; Shima, Joshua; Maryanto, Sigit; Wahyudiono, Joko
Jurnal Geologi dan Sumberdaya Mineral Vol 20, No 2 (2019): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

This paper provides the carbonate rocks facies model of the Wainukendi Formation. Several outcrops are well exposed in the Southern part of the Supiori Island. The main data are taken from 28 outcrops and 25 measured sections. Thirty seven rocks samples from the Korido dan Warvey Sections were collected and have been petrographic examination for microfacies analysis. Finally, the analysis find that the Wainukendi Formation basically composed by bioclastic carbonate platform and reef margin platform. Microfacies analysis indicate that these carbonate platforms consist of 4 facies zone, deep shelf (FZ2), toe of slope (FZ3), slope (FZ4), and platform margin (FZ5). Keywords: Facies, stratigraphy, Wainukendi Formation, Biak-Yapen Basin.

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