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LITHOLOGY UNITS PENGKOL AREA AND SURROUNDING, GUNUNG KIDUL DISTRICT, YOGYAKARTA PROVINCE. Gani, Reza Mohammad Ganjar; Firmansyah, Yusi; Nurdeani, Rifky
Journal of Geological Sciences and Applied Geology Vol 4, No 2 (2021): Journal of Geological Science and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v4i2.31820

The research area is located sub-district Nglipar,District of Gunnung Kidul,Yogyakarta Province. Accessibility to the research location by train Bandung - Yogyakarta, followed by a minibus to Nglipar District Gunung Kidul. Purpose Of this Research is to understanding geological conditions of the research area reviewed from litohologic units and its stratigraphic order. The lithostratigraphy of the research area is divided into 3 lithologic units, Breccia Unit, Sandstone Unit and Limestone Unit. namely the naming of the rock units based on observable physical characteristics, including rock type, uniformity lithology symptoms and their stratigraphic position. Geological history at the location of this study is the eruption of Mount Ngalanggran and deposited volcanic breccia units. Early Miocene deposited units sandstone. At that time there was a decrease in sea level which caused the diagenesis of the sedimentary material into limestone material. On Middle Miocene limestone deposited. Keyword: Lithologic units, stratigraphic order, Gunung Kidul District.

LITOFASIES ANALYSIS IN THE CIPAMINGKIS RIVER ROCK FORMATION JATILUHUR, BOGOR, WEST JAVA. Gani, Reza Mohammad Ganjar; Firmansyah, Yusi; Nurdrajat, Nurdrajat; Fathin, Muhammad Kayis
Journal of Geological Sciences and Applied Geology Vol 5, No 3 (2021): Journal of Geological Science and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v5i3.38253

The Sedimentary rocks result from the breakdown of previously transported rocks deposited and lithified. Sedimentary rocks cover almost 80% of the earth's crust (Folk, 1974). The research was conducted in the Cipamingkis River, Jonggol District, Bogor Regency, West Java. The research area is included in the Cianjur Regional Geological Map Sheet (Sudjatmiko, 1972) and is included in the Dayeuhkaum Earth Map (1209 – 233) published by the Geospatial Information Agency (BIG). The Jonggol District, Bogor Regency, West Java, has a large river, the Cipamingkis R,iver, stretching from the northeast to the southwest of the study area. This river is included in the Jatiluhur Formation (Sudjatmiko, 1972). The facies is a rock body with a different combination of physical, chemical and biological characteristics from the surrounding rock body, which reflects its original conditions, namely the way it was transported and the way it was deposited. Two bodies of rock deposited simultaneously have different facies if they have differences in their physical, chemical and biological characteristics. Units and sediment structure components in the study area are grouped into six lithofacies: (1) Thin-Medium Sandstone Layer, (2) Massive Claystone, (3) Alternating Sandstone and Claystone, (4) Thick Sandstone Layer, (5) Alternating Fine Sandstone and Very Fine Sandstone, and (6) Slump Deposit. Description of facies by limiting physical and chemical characteristics is called lithofacies, and lithofacies is a facies analysis method by considering information about physical and chemical characteristics of rock layers (Nichols, 2009).

LAND MOVEMENT VULNERABILITY ZONING IN THE HILLY AREA OF NORTHERN CILACAP, CENTRAL JAVA Nurfadli, Eza; Sukiyah, Emi; Gani, Reza Mohammad Ganjar; Ramadian, Aldrin
Journal of Geological Sciences and Applied Geology Vol 8, No 1 (2024): Journal of Geological sciences and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v8i1.57140

The northern part of Cilacap has an area with hilly morphology with slopes that are relatively gentle to steep. The geological setting in this region is quite complex, the combination of tectonics and the physical properties of the rocks means that this region is strongly deformed. This has an impact on areas prone to landslides as one of land movement types. To what extent can this area be classified based on the vulnerability of its land to landslides is the problem be studied. There are five aspects used in this research, namely rainfall, rock type, slope, land cover and soil type. The multi-aspect overlay method is used to determine the spatial distribution of land movement-prone zones. Geographic Information System-based software support makes the data analysis process easier. Based on the results of the spatial analysis of five aspects, it was concluded that the North Cilacap area could be grouped into 3 land movement vulnerability zones, namely the low vulnerability zone with a score of 8-17, the medium vulnerability zone with a score of 18-27, and the high vulnerability zone with a score of 28-37. The complex tectonic order is the main controller of land movement events in this region.

Evidence of Pliocene-Pleistocene Unconformity in eastern Bogor Trough, Sumedang-West Java Alam, Syaiful; Sendjadja, Yoga Andriana; Jurnaliah, Lia; Fachrudin, Kurnia Arfiansyah; Gani, Reza Mohammad Ganjar
Journal of Geological Sciences and Applied Geology Vol 3, No 1 (2019): Journal of Geological Sciences and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v3i1.21528

AbstractRecent measuring stratigraphic observation in Cikandung River has revealed the Late Pliocene stratigraphic and tectonic event. Research area is located in easter Bogor Trough. Previously, it was stated controversially pertaining to the stratigraphic relationship between Kaliwangu and Citalang Formations. The outcrop-based remark has never been explained, slightly intuitive. Making strike and dip measurements and stratigraphic analysis using tape and compass traverse were done to unveil the role of Plio-Pleistocene tectonic regime in stratigraphic-filling of the basin. Strike azimuths recorded from several locations of Citalang and Kaliwangu Formations show angular geometry and both of those sedimentary facies within formations indicate the significant and rapid change in depositional process. But interestingly, the angular geometry is only founded in the southern part of study area. To the north, angular relationship becomes parallel. This geometrical distribution implies the strong influence of tectonic regime in Late Pliocene interval. The evidence from outcrops observation conclude the unconformity between Citalang and Kaliwangu Formations. Keywords: Stratigraphic unconformity, Citalang and Kaliwangu Formations, Plio Pleistocene Tectonic

STRATIGRAPHY AND PETROGRAPHY OF ROCKS IN KARANGTENGAH VILLAGE AND SURROUNDINGS, BABAKAN MADANG SUB-DISTRICT, BOGOR DISTRICT, WEST JAVA PROVINCE GANI, REZA MOHAMMAD GANJAR; Firmansyah, Yusi; Putri, Nisrina Nadellia; Efendi, Tri Septianto; Fachrudin, Kurnia Arfiansyah
Journal of Geological Sciences and Applied Geology Vol 7, No 3 (2023): Journal of Geological Sciences and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v7i3.53012

Stratigraphy and petrography, integral components of geological science, are crucial for identifying mineral composition, rock texture, and characteristics, as well as understanding relationships between layers and layer positions. This study is located in Karangtengah Village and its Nearby Surroundings, Babakan Madang District, Bogor Regency, West Java Province. Physiographically, the study area is included in the Bogor Zone (Van Bemmelen, 1949). The research site is also incorporated in the Geological Map of Bogor Sheet, West Java. And specifically this research was conducted in the Cileungsi River. This river is included in the Jatiluhur Formation (Sudjatmiko, 1972). Stating the purpose of geological mapping, such as understanding regional geology, identifying mineral resources, or assessing geological hazards. Then, data collection in the field, such as conducting detailed field surveys to observe and record geological features, using field notebooks, GPS for plotting, and cameras for documentation, collecting rock samples for laboratory analysis (Petrography analysis and microfossil analysis). As a result of this study, there are four rock units in the Karangtengah area, with the order of formation from the oldest to the youngest. Firstly, Claystone Unit (Tmbl) consists of mudstones and sandstones, with fossils of P. transitoria and G. peripheroronda indicating an Early Miocene age (N8) and the depositional environment is the Outer Neritic. Second, the Old Andesite Intrusion (At) consists of andesite igneous rocks with Middle Miocene age and deposited in a terrestrial environment. Third, the Tuff Unit (Qt) is dominated by pyroclastic tuff rocks with Pleistocene age and deposited in a terrestrial environment. Finally, the Andesite Unit (Am) consists of andesite igneous rocks younger than the Pleistocene, penetrating the Tuff Unit (Qt) and the Claystone Unit, and deposited in a terrestrial environment.

Lithology Units Padaherang Area and Surrounding, Ciamis District, West Java Province Gani, Reza Mohammad Ganjar; Firmansyah, Yusi
Journal of Geological Sciences and Applied Geology Vol 5, No 2 (2021): Journal of Geological Science and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v5i2.35035

Administratively, Padaherang region and surrounding is included to kecamatan Padaherang, Ciamis Regency, West Java. The reason why this area is a research area is partly because the author feels that the area in Ciamis Regency is a southern mountainous area that is influenced by volcanism and sedimentation processes and other geological processes. In addition, there are still many geological problems that have not been fully revealed, so the author feels the need to conduct further and more detailed research. Objects to be studied in the field include rocks (description, sampling, direction of moves and slopes), indications of geological structures, and landscape appearances accompanied by sketch photos and additional data deemed to support the research results, The research steps carried out included several stages of work, namely the preparation stage, field work, laboratory research, and the stage of preparing reports. The trajectory that is traced in the field research that has been determined at the preparatory stage. If the trajectory is deemed inadequate, a search for additional trajectories is carried out. There are three methods used in geological mapping, namely the field orientation method, the compass trajectory method, the measuring tape method and the compass. In this mapping, the methods used are the field orientation method and the measuring tape and compass method. Threre are five lithology units which is arrange at research area, these units of lithologi from the older to the younger is breccias unit, sandstone units, claystone. Geology activity at research area predicted begun at Oligocen till Holocen era. first in Oligocen the volcanic activity is strong enough where the eruption produced the breccia and sandstone unit, this process stop at lower Miosen. And at the middle Miosen there is the tectonic activity hapenned. Limestone unit was diendapkan at middle Miocen, and claystone unit at upper Miocen, and quartery deposit is the younger unit at research area

NILAI DAN JENIS POROSITAS BATUPASIR PADA FORMASI WALATDI DAERAH CICANTAYAN, KABUPATEN SUKABUMI BERDASARKAN METODE PETROGRAFI Firmansyah, Yusi; Mardiana, Undang; Kurniawan, Endy; Nurdrajat, .; Gani, Reza Mohammad Ganjar
Bulletin of Scientific Contribution Vol 16, No 3 (2018): Bulletin of Scientific Contribution GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

ABSTRACTStudy of sandstone porosity Walat Formation in Sukabumi, West Java is a step to get information about the value and type of porosity that develops in this area. Sandstones that have good porosity can potentially become reservoir rocks but not all sandstones have good porosity. Systematic modeling of Walat Formation outcrops which are believed to have potential as reservoir rocks are analyzed in the laboratory to see their porosity. Eight samples were selected and analyzed by petrographic method to determine the type of porosity and calculate the sandstone porosity value of the Walat Formation located in Cicantayan Village, Cisaat District, Sukabumi District. Based on the results of petrographic analysis, all sandstone samples in the study area have intergranular primary porosity and have sufficient to special porosity values. Based on this research, it can be said that in general the sandstones in the study area have very good porosity which has the potential to be a good reservoir rock.Keywords: Walat Formation, sandstone, porosity, petrographic analysis.ABSTRAKKajian porositas batupasir Formasi Walat di Sukabumi, Jawa Barat merupakan suatu langkah untuk mendapatkan informasi mengenai nilai dan jenis porositas yang berkembang pada daerah ini. Batupasir yang memiliki porositas yang baik dapat berpotensi menjadi batuan reservoir namun tidak semua batupasir memiliki porositas yang baik. Sistematika pemercontohan singkapan Formasi Walat yang diyakini berpotensi sebagai batuan reservoar di analisis ke laboratorium untuk dilihat porositasnya. Sebanyak delapan percontoh terpilih dan dianalisis dengan metode petrografi untuk mengetahui jenis porositas serta menghitung nilai porositas batupasir Formasi Walat yang terletak di desa Cicantayan, Kecamatan Cisaat, Kabupaten Sukabumi. Berdasarkan hasil analisis petrografi semua percontoh batupasir di daerah penelitian memiliki porositas primer intergranular dan memiliki nilai porositas yang cukup hingga istimewa. Berdasarkan penelitian ini dapat dikatakan secara umum batupasir didaerah penelitian memiliki porositas yang sangat baik sehingga berpotensi menjadi batuan reservoir yang baik.Kata Kunci: Walat Formation, sandstone, porosity, petrographic analysis.

BATUAN SEDIMEN DI CEKUNGAN OBI SERTA POTENSINYA SEBAGAI BATUAN SUMBER Putra, Andri Perdana; Gani, Reza Mohammad Ganjar
Bulletin of Scientific Contribution Vol 16, No 3 (2018): Bulletin of Scientific Contribution GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Cekungan Obi merupakan cekungan Tersier di Kawasan Timur Indonesia yang memiliki endapan batuan sedimen berumur Paleogen dan Neogen namun belum memproduksi hidrokarbon, sehingga menarik untuk dipelajari dan dikaji potensi sumberdaya minyak dan gas buminya. Daerah penelitian cekungan Obi meliputi pulau Bacan dan pulau Kasiruta di bagian utara serta pulau Obi dan pulau Obilatu di bagian selatan yang secara administrasi termasuk ke dalam Kabupaten Halmahera Selatan, Propinsi Maluku Utara. Tujuan dilakukannya penelitian ini adalah untuk mengkaji potensi batuan sumber (source rock) cekungan Obi yang mendukung dalam prospeksi sistem perminyakan cekungan Obi. Metode yang digunakan dalam penelitian ini mencakup pengamatan dan perekaman data lapangan serta pengambilan contoh batuan terhadap satuan-satuan batuan di beberapa lokasi dan lintasan pengamatan terpilih untuk analisa geokimia organik. Lokasi pengamatan lapangan terhadap satuan batuan dilakukan di lokasi tipe tempat batuan tersebut pertama kali diamati dan dinamakan. Formasi Loleobasso disebandingkan dengan formasi Piniya yang diendapkan pada laut dangkal-paparan yang dipengaruhi oleh pasang surut. Formasi Fluk kemungkinan diendapkan pada area laut dangkal, Formasi Amasing kemungkinan diendapkan pada area laut dangkal, Formasi Ruta kemungkinan diendapkan pada area laut dangkal-paparan dan Formasi Woi kemungkinan diendapkan pada area laut dangkal-paparan. Berdasarkan hasil analisa TOC terhadap percontoh satuan-satuan batuan di beberapa lokasi dan lintasan pengamatan terpilih dapat disimpulkan bahwa secara umum cekungan Obi memiliki potensi batuan sumber dengan kategori buruk, dengan kerogen tipe III dan tipe IV. Tingkat kematangan termal batuan sumber cekungan Obi umumnya berada pada tingkat belum matang, matang dan overmature. Kata Kunci: Cekungan Obi, Batuan Sedimen, Batuan Sumber, Nilai TOC.

KARAKTERISTIK BATUBARA DAERAH KECAMATAN NUNUKAN, KALTARA GANI, REZA MOHAMMAD GANJAR
Bulletin of Scientific Contribution Vol 18, No 1 (2020): Bulletin of Scientific Contribution : GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/bsc.v18i1.27358

Saat ini batubara banyak dibutuhkan karena merupakan, bahan galian yang strategis dan salah satu bahan baku energi nasional yang mempunyai nilai ekonomi penting. Informasi mengenai sumberdaya dan cadangan batubara menjadi hal yang mendasar dan penting dalam merencanakan strategi kebijaksanaan energi nasional dikarenakan saat ini, pemerintah tengah meningkatkan pemanfaatan batubara baik sebagai energi altematif untuk keperluan domestik seperti pada sektor industri dan pembangkit tenaga listrik maupun untuk keperluan ekspor. Maksud dari pelaksanaan kegiatan ini adalah untuk melaksanakan pemetaan awal yaitu dengan mempelajari Kondisi Geologi Daerah Penyelidikan secara umum guna mendapatkan data-data awal serta gambaran secara jelas mengenai keberadaan dan potensi deposit batubaranya. Kota terdekat dari daerah penyelidikan adalah Kota Nunukan. Letak lokasi penyelidikan tepatnya ke arah barat dari Kota Nunukan dengan jarak sekitir 50 km. Nunukan merupakan sebuah pulau kecil dengan luas areal sekitar 34.000 ha yang pada saat sekarang telah menjadi kabupaten hasil dari pemekaran kabupaten sebelumnya yaitu Kabupaten Bulungan. Berdasarkan data-data hasil Kegiatan Penyelidikan Lapangan, stratigrafi litologi penyusun Daerah Penyelidikan didominasi oleh ; Alluvium dan anggota Formasi Meliat (Tmm) serta Formasi Tabul (Tmt). Berdasarkan data Geologi Regional dan Hasil Interpretasi Data-data Lapangan diduga Daerah Penyelidikan berada pada salah satu sayap / sisi suatu “Zona Lipatan”, hal tersebut terutama dicirikan oleh gradasi harga “dip” (kemiringan lapisan) batuan dan batubara yang tidak konsisten pada beberapa Lokasi / Stasiun Pengamatan di lapangan. Hasil penyelidikan sumberdaya batubara di lapangan didapat 14 singkapan batubara dipermukaan (outcrop) dengan jumlah titik pengamatan yang disampling sebanyak 7 titik untuk kernudian dikirim ke laboratorium. Secara megaskopis, umumnya batubara di daerah penyelidikan berwarna hitam kusam, berlapis dengan retakan angular, agak kompak, dan agak keras. Dari kenampakan megaskopis tersebut, diperkirakan bahwa secara umum kualitas batubara yang ada di daerah penyelidikan adalah browncoalignite.Kata kunci: eksplorasi, batubara, nunukan

GAS IN PLACE PREDICTION OF COAL BED METHANE EXPLORATION WITH PROXIMATE DATA, PIT “HMG”, WEST BANKO, SOUTH SUMATRA GANI, REZA MOHAMMAD GANJAR; Arbi, Hafsanjani; Firmansyah, Yusi; Nurdrajat, .; Alfadli, Muhammad Kurniawan
Bulletin of Scientific Contribution Vol 16, No 2 (2018): Bulletin of Scientific Contribution GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

The energy demand are increase everyday, but the supply insufficiently if only depends on conventional energy. Coal bed methane exploration are one of the unconventional energy that can fulfill energy demand. The main aspect of coal bed methane exploration are the reserve of gas in place. In this research are use conventional data to approach a prediction and calculation of gas in place at PIT “HMG”, West Banko, Tanjung Enim, South Sumatra. Based on the analysis shows that the gas content are increase as the deeper of seam, and the total gas in place are 235.30 MMcf, with Seam C has the highest value 72.47 MMcf.

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