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All Journal Bulletin of Scientific Contribution : Geology Journal of Geosciences and Applied Geology

Yusi Firmansyah, Yusi

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Author-ID : 568180

Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Energy Engineering Environmental Science

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LITHOLOGY UNITS WANAJAYA AREA AND SURROUNDING, BUAHDUA SUBDISTRICT, SUMEDANG DISTRICT, WEST JAVA PROVINCE Ganjar Gani, Reza Moh; Firmansyah, Yusi; Arfiansyah, Kurnia; Efendi, Tri Septanto; Rodhiya, Azzam Robbi
Journal of Geological Sciences and Applied Geology Vol 8, No 2 (2025): 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.v8i2.61082

The research site is located in Wanajaya Village, Buahdua Subdistrict, Gunung Kidul Regency, West Java Province. Accessibility to the research location using a motorbike. The purpose of this study is to determine the geological conditions of the study area in terms of lithological units and stratigraphic order. The lithological unit of the study area is divided into 4 lithological units, namely the Mudstone Unit, the Andesite Intrusion Unit, the Volcanic Breccia Unit and the Andesite Lava Unit, namely the naming of rock units based on observable physical characteristics, including rock type, uniformity of lithological symptoms and stratigraphic position. The geological history of the first research site in the Late Miocene to Early Pliocene time was deposited by the mudstone unit. In the late Pliocene to Pleistocene volcanism activity occurred due to the displacement of the volcanic centre from the south to the centre of Java (Martodjojo, 1984) which caused the formation of the wanajaya fold and continued with the formation of the wanajaya ascending fault. As a result of the weak fault zone, the andesite intrusion unit appeared, which was the beginning of the activity of the old volcano. In Pleistocene time, namely deposition of Volcanic Breccia Unit and continued by the deposition of andesite lava unit due to volcanism activity of Tampomas volcano issued pyroclastic material.

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.

PENDUGAAN KETERDAPATAN AKIFER AIRTANAH DENGAN METODE GEOLISTRIK DI KECAMATAN SUKATANI - KABUPATEN PURWAKARTA Mohamad, Febriwan; Firmansyah, Yusi
Bulletin of Scientific Contribution Vol 13, No 3 (2015): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

The research area as administratively is located in Sukatani village, District Sukatani, Purwakarta, West Java Province. Based on the relief morphology, strato volcanic facies models and its lithology, geomorphology of Sukatani is strato volcanoes leg with radial drainage pattern. This area height of about 260-300 meters above sea level. Stratigraphy unit of research area is divided into two units, namely Tufic sandstones-Conglomerates, and Alluvium. The study is intended to determine the position and water resources at a certain depth below the surface and determine subsurface conditions. The study based on measurements of geoelectric method of geoelectric 1-D and 2-D configuration of Schlumberger. The results of study are in the form of rock resistivity values. They are interpreted in the cross-sectional shape and correlated with geological and hydrogeological conditions. Based on the resistivity value, distribution layer in the study area are classified into three packages, namely rock low resistivity layer (<35 ohm-meter) expected role as aquiclud layer, a layer of medium resistivity (35-100 ohm-meters) are expected to act as a layer aquifer, and a layer of high resistivity (> 100 ohm-meters) are expected to act as a layer aquifug.

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.

Potensi Airtanah Berdasarkan Nilai Resistivitas Batuan di Kelurahan Cangkorah, Kecamatan Batujajar, Kabupaten Bandung Barat Mohammad, Febriwan; Mardiana, Undang; Yuniardi, Yuyun; Firmansyah, Yusi; Alfadli, Muhammad Kurniawan
Bulletin of Scientific Contribution Vol 14, No 2 (2016): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Groundwater is water that contain under the soil or rock which located in subsurface layer. The resistivity method or geoelectricity using electrical properties of subsurface materials to obtain the anomalies. Aquisition data did with 2 line of 2-D resistivity and 10 point of 1-D resistivity. The result from 1-D resistivity are divided into three classification : First classification had range between 1 – 5 Wm which indicate the rock with low resistivity and shallow. This layer interpretated as clay from Saguling Lake sedimentation and this layer act as aquiklud layer. The second classification with range between 6 – 20 Wm indicated as medium resistivity and act as aquitard. The third classification with range more than 20 Wm indicated as high resistivity and act as aquifer with low productivity. From the 2-D resistivity survey, such as : Low resistivity range assosiated with shaly tuff lithology and sandy tuff, depth of the low resistivity range about 0 – 40 meters, Medium resistivity range had depth about 10 – 70 meters, act as aquifer due to have well porosity properties. High resistivity range depth is more than 70 meters until 100 meters assosiated with massif layer, bad porosity, and did not have rock pore, the lithology is collaboration between massif breccia with igneous component. Keyword : Geoelectricity, Resistivity, Batujajar, Groundwater, Aquifer Air tanah merupakan air yang terdapat di dalam lapisan tanah atau batuan yang terletak di bawah permukaan tanah. Metode resistivitas (resistivity) atau geolistrik memanfaatkan sifat kelistrikan material bawah permukaan untuk mendapatkan anomali. Pengukuran dilakukan sebanyak 2 lintasan geolistrik 2-D dan 10 titik pengukuran 1-D. Dari hasil pengukuran metode 1-D diperoleh 3 paket batuan yaitu : Paket lapisan batuan 1 dengan nilai tahanan jenis berkisar antara 1 – 5 Wm yang mengindikasikan batuan dengan resistivitas amat rendah dan dangkal. Lapisan ini diduga berupa lempung dari endapan danau Saguling. Lapisan ini diduga berperan sebagai akiklud. Paket lapisan batuan 2 dengan nilai tahanan jenis antara 6 hingga 20 Wm mengindikasikan batuan dengan resistivitas menengah dan bersifat sebagai akitar . Paket lapisan batuan 3 dengan nilai tahanan jenis antara lebih dari 20 Wm mengindikasikan batuan dengan resistivitas yang tinggi dan dapat berperan sebagai akifer dengan produktivitas rendah. Dan dari hasil geolistrik 2-D, yaitu : Rentang resisitivitas rendah kemungkinan berasosiasi dengan batuan dengan litologi tuf lempungan dan tuf pasiran memiliki kedalaman bervariasi antara 0-40 meter, Rentang resistivitas menengah memiliki kedalaman bervariasi sekitar 10-70 meter. Porositas paket batuan ini diperkirakan baik, dan dapat berperan sebagai akifer, Rentang resisitivitas tinggi ini berasosiasi dengan rentang kedalaman yang bervariasi mulai dari 70 meter hingga kedalaman lebih dari 100 meter berasosiasi dengan Lapisan keras, massif, porositas buruk dan tidak dapat menyimpan air di antara pori-pori batuannya, berupa perpaduan antara breksi padu dengan komponen batuan beku. Kata kunci : Geolistrik, Resistivitas, Batujajar, Airtanah, Akifer

STUDI GEOLOGI DAN GEOFISIKA POTENSI HIDROKARBON FORMASI AIR BENAKAT LAPANGAN X CEKUNGAN SUMATERA SELATAN Simorangkir, Fenry; Haryanto, Iyan; -, Nurdrajat; Firmansyah, Yusi
Bulletin of Scientific Contribution Vol 13, No 1 (2015): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

X field is part of the South Sumatra Basin with an area of 359,6 km2. This study is focused to discuss potential hydrocarbons in x fiels. In this study, the discussion will be focused on the Air Benakat Formation. The method used is based on the interpretation of seismic and well. Based on the results of the analysis of the petrophysic of the FS, HA, and BS well shows average Netpay on Air Benakat Formation is 180 m, with a cut-off Volume Shale 0.4, cut-off PHIE 0.12 and cut-off Saturation Water 0.71. As for the Netpay from reservoir itself is average 12.415 m. Geological modeling based on the results obtained by petroleum leads three zone with two reservoir zones. For reservoar A, the most potentially zone is the zone of Lead-1 with with a resources amount of 716.82 MMBO, Zone of Lead-2 with a resources amount of 398.89 MMBO, and zone of Lead-3 with a resources amount of 108.14 MMBO. For resevoar B, the most potentially zone is the zone of Lead-1 with a resources amount of 662.13 MMBO, Lead-2 Zone with a total resources of 368.46 MMBO, and zone of Lead-3 with a total resources of 99.89 MMBO.

BATUBARA FORMASI STEENKOOL DI DAERAH RANSIKI, PAPUA Setiadi, Djadjang Jedi; Alam, Syaiful; Nurdrajat, .; Gani, Reza Mohammad Ganjar; Firmansyah, Yusi
Bulletin of Scientific Contribution Vol 16, No 3 (2018): Bulletin of Scientific Contribution GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Makalah ini menyajikan hasil penelitian terhadap salah satu endapan batubara yang belum banyak dikenal dalam literatur geologi Indonesia, yakni batubara Formasi Steenkool (akhir Miosen – Plistosen) yang ada di daerah Ransiki, Kepala Burung, Papua. Hasil penelitian lapangan menunjukkan bahwa batubara Formasi Steenkool dapat dibedakan menjadi tiga jenis, yakni bright coal, banded bright coal, dan dull coal. Batubara tersebut umumnya berwarna hitam dengan gores coklat, dan keras. Belerang kadang-kadang ditemukan mengisi bidang pecah planar hingga conchoidal yang berkembang didalamnya. Lapisan-lapisan batubara Formasi Steenkool di daerah Ransiki memiliki ketebalan yang sangat bervariasi, mulai dari beberapa centimeter hingga hampir 3 m. Sebagian diantaranya mengandung parting serpih karbonan dengan ketebalan umumnya kurang dari 20 cm. Lapisan-lapisan batubara umumnya diapit oleh lapisan serpih karbonan, meskipun ada sebagian diantaranya yang dialasi atau ditutupi oleh lapisan batupasir halus. Hasil penelitian laboratorium terhadap 13 sampel terpilih mengindikasikan bahwa batubara Formasi Steenkool umumnya memiliki kelembapan rata-rata < 3% adb, kadar abu rata-rata < 5%, kadar volatil rata-rata > 40%, kandungan karbon tertambat rata-rata > 45%, dan kadar belerang rata-rata < 1% dengan nilai kalor > 5000 kal/g. Penelitian ini mengungkapkan hasil yang berbeda dengan laporan yang selama ini diterima mengenai batubara Formasi Steenkool. Pertama, hasil penelitian ini menujukkan bahwa hampir semua batubara Formasi Steenkool di daerah penelitian merupakan high-volatile subbituminous coal, bukan lignit sebagaimana dilaporkan selama ini. Kedua, batubara Formasi Steenkool memiliki kualitas yang cukup baik. Hal itu terlihat dari bukti fisik sebagaimana terlihat di lapangan dan dari hasil penelitian laboratorium yang menunjukkan bahwa semua sampel memiliki nilai kalor lebih dari 5000 kal/g. Hasil penelitian ini mengindikasikan bahwa batubara Formasi Steenkool layak diteliti lebih lanjut dan seksama untuk mengetahui potensi endapan batubara di wilayah Kepala Burung, Papua, dan untuk mengkaji nilai ekonomis yang mungkin dimilikinya.Kata kunci: Formasi Steenkool, Batubara, Papua

PERANAN ASPEK STRATIGRAFI DAN GEOLOGI DALAM MENGKAJI POTENSI GERAKAN TANAH DI KECAMATAN PELABUHAN RATU, KABUPATEN SUKABUMI Firmansyah, Yusi; Ganjar Gani, Reza Mohammad; Setiadi, Djadjang Djedi; Adycipta, Adycipta
Bulletin of Scientific Contribution Vol 15, No 1 (2017): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

ABSTRAKPenelitian ini dilakukan untuk menilai potensi gerakan tanah yang mengacu kepada aspek-aspek geologi yang berkembang pada daerah penelitian. Secara astronomis daerah penelitian terletak pada 7o 0’ 3.15” – 7o 5’ 26.89” LS dan 106o 37’ 43.84” – 106o 43’ 10.28” BT, dengan dimensi 10x10 Km. Aspek geologi yang digunakan untuk mengidentifikasi pergerakan tanah antara lain geomorfologi, stratigrafi dan geologi struktur, selain dari ketiga aspek tersebut kami juga mempertimbangkan aspek tutupan lahan sebagai pemicu pergerakan tanah. Dalam menganalisa potensi pergerakan tanah metoda yang digunakan adalah skoring, dimana variabel yang akan digunakan diberi nilai dan dimasukan kedalam kelas-kelas. Dari hasil analisis potensi gerakan tanah, dapat disimpulkan bahwa daerah penelitian didominasi oleh zona stabil hingga kurang stabil. Sedangkan untuk daerah yang dianggap tidak stabil berada dibeberapa titik dari lereng sungai cimandiri yang juga merupakan zona sesar cimandiri dan sesar hegarmanah, dengan litologi batubeku andesit, batugamping dan alluvium. Kata kunci : Longsor, Pergerakan Tanah, Pemetaan Geologi ABSTRACTThis study was conducted to assess the potential for ground movement, which refers to the geologic aspects of developing the research area. In astronomical research area lies in 7o 0’ 3.15” – 7o 5’ 26.89” LS dan 106o 37’ 43.84” – 106o 43’ 10.28” BT, with dimensions of 10x10 km. Geological aspects are used to identify the movement of the ground, among others, geomorphology, stratigraphy and geologic structure, apart from these three aspects we also take into consideration aspects of land cover as a trigger for ground movement. In analyzing the potential for ground movement is scoring method used, where the variables to be rated and incorporated into classes. From the analysis of the potential for ground movement, it can be concluded that the study area is dominated by stable to less stable zone. As for areas that are considered unstable are several points of the slope Cimandiri river which is also the fault zones and fault Cimandiri Hegarmanah, with lithology batubeku andesite, limestone and alluvium. Keywords : Landslide, Soil Movement, geological mapping

POTENSI HIDROKARBON FORMASI AIR BENAKAT, LAPANGAN ‘CA’, CEKUNGAN SUMATERA SELATAN Prawoto, Adycipta Anis; Firmansyah, Yusi; -, Nurdrajat; Sunardi, Edy
Bulletin of Scientific Contribution Vol 13, No 1 (2015): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Field ‘CA’ located in the South Sumatra Basin with an area of 6433 Km2. This study aimed to evaluate the hydrocarbon potential of Air Benakat Formation. Based on the results of the petrophysical analysis from well HA, BA, PA, RI and SE show the results are : Vsh cut off 0.34, Phie cut off 0.136 and SW cut off 0.59. Determination of reservoir netpay performed on HA well, that have thick of netpay 14.638 meters. The results of picking seismic horizon are time and depth structure maps of Air Benakat Formation and Gumai Formation. The map was made for determining lead in the research area. Calculation of estimated hydrocarbon reserves in the research area shows the value of OOIP is 345 MMBO.

Sikuen Stratigrafi Formasi Talang Akar Lapangan “Dr”, Sub–Cekungan Jambi,Cekungan Sumatera Selatan Firmansyah, Yusi; Riaviandhi, Dhehave; Gani, Reza Muhammad Ganjar
Bulletin of Scientific Contribution Vol 14, No 3 (2016): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

The area of this study include to PT. Energi Mega Persada Tbk work area. The area of this study is located in Jambi Sub - Basin, South Sumatera Basin. This study is emphasized to examine the sequence stratigraphy of Talang Akar Formation. The data that is used in this study include core, mudlog, 3D seismic, well log, and palynomorf fossil. The result of those data analysis and data correlation are lithofacies, electrofacies, depositional environment, and stratigrahys sequences of Talang Akar Formation. From data analysis, the facies’ that develop in Talang Akar Formation are A, B, C, D, E, F, G, H, I, J, K, L, and M. Those facies’are deposited in fluvial – deltaicenvironment at Late Oligocene until Early Miocene. From the well correlation and seismic interpretation, the sediment distribution pattern of Talang Akar Formation become thicker and deeper in the west side and the highland is located relatively in the east of the study area. At the area of study Talang Akar formation is very influenced by structure. From the lithofacies and electrofacies analysis, there are six kinds of stratigraphy sequencesthat develop in the study area. System tracts LST-1 (braided channel) just developed at sequence-1. The other sequences developed TST 1 – 4 (floodplain meandering channel), TST 5 – 6 (marsh delta plain), HST 1 – 4 (crevasse splay meandering channel) and HST 5 – 6 (floodplain delta plain). . Keywordsi: Sequence stratigraphy, facies,depositional environment, Talang Akar Formation, Jambi Sub - Basin. Daerah penelitian termasuk ke dalam wilayah kerja PT. Energi Mega Persada Tbk. Daerah penelitian berada di Sub – Cekungan Jambi, Cekungan Sumatera Selatan. Studi ini difokuskan untuk membahas sikuen stratigrafi Formasi Talang Akar. Dalam penelitian ini, data yang digunakan adalah core, mudlog, seismik 3 dimensi, well log, dan fosil palinomorf. Hasil dari analisis dan korelasi data tersebut adalah litofasies, elektrofasies, sikuen stratigrafi, dan lingkungan pengendapan dari Formasi Talang Akar. Dari analisis data tersebut didapatkan bahwa fasies yang berkembang pada Formasi Talang Akar adalah fasies A, B, C, D, E, F, G, H, I, J, K, L, dan M. Fasies tersebut diendapkan di lingkungan fluvial – deltaic pada umur Oligosen Akhir sampai Miosen Awal. Berdasarkan korelasi antar sumur dan interpretasi seismik, distribusi sedimen Formasi Talang Akar lebih menebal dan mendalam pada sisi barat dengan tinggian yang berada relatif pada bagian timur daerah penelitian. Pada daerah penelitian Formasi Talang Akar sangat dipengaruhi oleh struktur serta berdasarkan analisis litofasies dan elektrofasies terdapat 6 sikuen yang berkembang pada daerah penelitian. System tracts LST-1 (braided channel) hanya berkembang pada sikuen-1. Pada sikuen lainnya berkembang TST 1 – 4 (floodplain meandering channel), TST 5 – 6 (marsh delta plain), HST 1 – 4 (crevasse splay meandering channel) dan HST 5 – 6 (floodplain delta plain). Kata kunci : Sequence stratigraphy, facies, depositional environment, FormasiTalang Akar, Sub Cekungan Jambi.

Co-Authors Abdurrokhim, . Adycipta Anis Prawoto, Adycipta Anis Adycipta, Adycipta Alam, Boy Yoseph Cahya Sunan Sakti Syah Alisah, Alisah Alpionisa, Salsabila Nur Arbi, Hafsanjani Bombom Rachmat Suganda, Bombom Rachmat DEWI, VISKA TRIARAMINTA Dhehave Riaviandhi, Dhehave Djadjang Jedi Setiadi Dwi Hadian, Mohammad Sapari Edy Sunardi Efendi, Tri Septanto Efendi, Tri Septianto Fachrudin, Kurnia Arfiansyah Fahrul Yahya, Moh Fathin, Muhammad Kayis Febriwan Mohamad, Febriwan Febriwan Mohammad, Febriwan Fenry Simorangkir, Fenry Gani, Reza Mohamad Ganjar GANI, REZA MOHAMMAD GANJAR Ganjar Gaji, Reza Mohammad Ganjar Gani, Reza Moh Ganjar Gani, Reza Moh. Ganjar Gani, Reza Mohammad Irvan Sophian, Irvan Iyan Haryanto, Iyan Khoirullah, Nur Kurnia Arfiansyah, Kurnia Kurniawan, Endy Muhammad Kurniawan Alfadli Nanda Natasia Nurdeani, Rifky Nurdrajat Nurdrajat Nurdrajat, Aji Pamengkas, Satrio Fajar Prasetio, Rio Akmal Rizky Putra, Rafino Kurnia Putri, Nisrina Nadellia Raden Irvan Sophian, Raden Irvan Rafie, Muhammad Restu, Abigail Reza Muhammad Ganjar Gani, Reza Muhammad Ganjar Rizki, Afdal Rodhiya, Azzam Robbi Ryan Pratama Saputra, Mulyana Syaiful Alam Undang Mardiana Yuyun Yuniardi Zakaria, Zufialdy Zufialdi Zakaria

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