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All Journal Bulletin of Scientific Contribution : Geology Jurnal IPTEK Journal of Geoscience, Engineering, Environment, and Technology Jurnal Penelitian Sains PROMINE Jurnal Mineral, Energi dan Lingkungan Jambura Geoscience Review Jurnal Mineral, Energi dan Lingkungan Jurnal Geosains dan Remote Sensing (JGRS) Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal) Journal of Earth and Marine Technology (JEMT) Teknika Sains : Jurnal Ilmu Teknik Jurnal Penelitian Inovatif Ophiolite : Jurnal Geologi Terapan Journal of Geoscience Engineering and Energy (JOGEE) JURNAL TEKNIK GEOLOGI : Jurnal Ilmu Pengetahuan dan Teknologi Innovative: Journal Of Social Science Research Journal of Geology Sriwijaya OPHIOLITE : Jurnal Geologi Terapan JURNAL PERTAMBANGAN
Yogie Zulkurnia Rochmana
Teknik Geologi Universitas Sriwijaya
Agriculture, Biological Sciences & Forestry Humanities Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Earth & Planetary Sciences Education Energy Engineering Environmental Science Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Public Health Social Sciences Transportation Other

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Unravelling the Sequence Stratigraphy Impact on Coal Geometry of M2 Member, Muara Enim Formation Hibatullah, Kevin Nabil; Setiawan, Budhi; Rochmana, Yogie Zulkurnia; Wicaksono, M Dwiki Satrio
Journal of Geoscience, Engineering, Environment, and Technology Vol. 11 No. 1 (2026): JGEET Vol 11 No 01 : March (2026)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2026.11.1.16191

Abstract

Sequence stratigraphy involves studying a series of rock layers deposited during a full change cycle in accommodation or sediment supply, bounded by subaerial unconformities and marine correlative conformities. This study aims to identify the stratigraphic sequence that controls the coal accumulation models and their influence on the coal geometry. The research methodology includes geological mapping, analysis of geophysical logs (gamma-ray and short density), and core log analysis. The data were analyzed, combined, interpreted, and simulated to create a model of coal accumulation and geometry. The M2 Member of the Muara Enim Formation comprises six lithofacies, as determined by analyzing four drill holes. The M2 Member of the Muara Enim Formation exhibits four depositional environments (crevasse splay, mire/swamp, mudflat, lagoon, and tidal/mouth/distal bar) and three facies associated with the fluvial delta–tidal plain facies (fluvial dominated upper delta plain, tide-dominated lower delta plain,  and marginal tidal plain and lagoon). This research identified four system tracts, namely TST-1, HST-1, TST-2, and HST-2. TST-1 and TST-2 show continuous coal deposition, inclined to steeply inclined, interspersed, and characterized by the presence of three layers of clay bands. Similarly, HST-1 and HST-2 exhibit continuous coal deposition with gentle to steep inclined and interspersed, ranging from moderately thick to very thick, and containing one to five layers of clay bands. The tectonic activity after deposition caused the deposited coal to deform. The findings of this study contributed to guiding the exploration of coal seams in the South Sumatra Basin and Muara Enim Formation, in particular.
OPTIMASI GIS: PEMETAAN AKUMULASI AIR PADA LOW WALL PIT A, PT BUKIT ASAM, TBK. Surbakti`, A. F. H.; Hastuti, E. W. D.; Rochmana, Y. Z.; Utamaputra, R. G.; Ersyari, J.; Chen, R. D.
Jurnal Pertambangan Vol. 6 No. 1 (2022): Februari 2022
Publisher : Fakultas Teknik Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36706/jp.v6i1.1107

Abstract

Aktivitas penambangan batubara terutama pada sistem tambang open pit dan open cut kerap kali menimbulkan masalah pada akumulasi air yang terbentuk di permukaan. Genangan air menjadikan lereng tanah jenuh dan sering menjadi pemicu lorotan material dari dinding tambang terutama pada bagian low wall. Pemetaan dioptimalkan guna mengidentifikasi akumulasi dan jalur air yang terbentuk pada low wall Pit A. Sehingga dapat dilakukan pemodelan aliran air dalam rekomendasi geoteknik dan pengendaliannya agar tidak terjadi penjenuhan (saturated). Pemetaan dilaksanakan berdasarkan hasil survei dengan akurasi satu meter dengan Geographic Information System (GIS) dengan hydrogeology tools, pengecekan kondisi aktual, perhitungan volume air hujan infiltrasi serta run-off berdasarkan curah air hujan dan material properties di Pit A. Data curah hujan sejak Januari hingga Desember 2021 menampikan angka dengan interval 83,0 hingga 507,5 mm. Analisis laboratorium menunjukkan nilai void ratio batuan low wall berupa lempung pasiran sebesar 0,53 sedangkan nilai porositas 34,14% di Pit A. Berdasarkan kajian GIS merepresentasikan volume akumulasi air total pada low wall adalah 764.348,41 m3 yang terdiri dari 404.705,544 m3 air infiltrasi sedangkan 359.642,875 m3 merupakan aliran run off. Hasil ekstraksi dengan GIS terbukti lewat keadaan aktual yang ditemukan di low wall Pit A dengan ditemukannya akumulasi serta aliran air. Pengamatan akumulasi air pada low wall Pit A ini diharapkan mengurangi potensi lereng yang jenuh sehingga muaranya adalah kestabilan lereng saat proses optimasi batubara.
PENGARUH ATRIBUT CLEAT TERHADAP PERMEABILITAS BATUBARA DAERAH KUNGKILAN, KABUPATEN LAHAT, SUMATERA SELATAN Novita, A. F.; Rochmana, Y. Z.
Jurnal Pertambangan Vol. 8 No. 2 (2024): Mei 2024
Publisher : Fakultas Teknik Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36706/jp.v8i2.1600

Abstract

Cleat merupakan rekahan alami yang muncul sebagai dampak dari pembebanan maupun struktur. Rekahan pada batubara menjadi alur lintasan fluida pada batubara untuk mengalir masuk ataupun keluar. Penelitian ini dilakukan untuk mengetahui potensi gas metana batubara melalui analisis cleat pada area Kungkilan, Kabupaten Lahat yang termasuk ke dalam Cekungan Sumatera Selatan. Pengambilan data atribut cleat menggunakan metode observasi lapangan yaitu dengan melakukan pengukuran kedudukan (strike-dip), atribut cleat berupa spacing dan aperture dengan menggunakan metode scanline pada sembilan lokasi penelitian, dan dilanjutkan perhitungan nilai permeabilitas batubara menggunakan rumus darcy. Dari pengukuran tersebut hasil arah umum face cleat adalah timur laut-barat daya dan butt cleat berarah barat laut-tenggara dengan menghasilkan atribut cleat dengan rata-rata aperture pada face cleat 0,02-0,1 cm dan butt cleat yaitu 0,03-0,2 cm, sedangkan spacing pada face cleat 2,9 hingga 5,7 cm dan pada butt cleat 3,8-7,9 cm. Berdasarkan perhitungan dari persamaan permeabilitas, hasil permeabilitas yang diperoleh kisaran yaitu 2,27 mD-42,95 mD yang setelah dirata-rata pada model match sticks sebesar 15,635 mD serta 3,02 mD-57,27 mD setelah rata-rata model cubes yaitu 21,598 mD. Hasil keterdapatan permeabilitas yang bernilai rendah diperoleh di seam d pada LP 1 sedangkan nilai tertinggi diperoleh di seam c pada LP 8. Maka dapat ditarik kesimpulan adanya korelasi antara atribut cleat dengan permeabilitas dan di beberapa coal seam terutama seam c memiliki kualitas permeabilitas untuk gas metana batubara cukup baik. Hal tersebut selaras dengan pandangan Peter (2008), dimana dalam pemanfaatan gas metana batubara, permeabilitas yang optimal yaitu 30 mD-50 mD.
Rekonstruksi Sejarah Pengendapan Berdasarkan Analisis Stratigrafi Daerah Belik Dan Sekitarnya Kabupaten Pemalang, Jawa Tengah Muhammad Alif Setiawan; Yogie Zulkurnia Rochmana
Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal) Vol. 7 No. 2 (2026): May
Publisher : Mataram University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/goescienceed.v7i2.1639

Abstract

Perubahan lingkungan pengendapan yang bervariasi pada laut dalam Zona Serayu Utara yang merupakan bagian dari sistem Cekungan Busur Belakang Jawa (Back-Arc Basin). Kompleksitas geologi wilayah ini dipengaruhi oleh subduksi Lempeng Indo-Australia terhadap Lempeng Eurasia di selatan Jawa. Penelitian ini bertujuan untuk mengidentifikasi urutan stratigrafi, karakter litologi, dan lingkungan pengendapan, serta merekonstruksi sejarah pengendapan berdasarkan hasil observasi lapangan dan analisis laboratorium. Metode yang digunakan adalah analisis stratigrafi yang mencakup observasi lapangan dan analisis laboratorium. Hasil penelitian menunjukkan bahwa urutan stratigrafi dari tua ke muda terdiri atas Formasi Rambatan (Tmr) berumur Miosen Tengah, tersusun atas batupasir gampingan dan batuserpih yang terendapkan di lingkungan laut dalam akibat arus turbidit. Formasi ini diterobos oleh intrusi Diorit (Tmi(d)) pada akhir Miosen Tengah. Di atasnya terdapat Formasi Halang (Tmph) berumur Miosen Akhir yang tersusun atas batupasir andesitan dan batulempung hasil sedimen campuran dan material vulkanik. Formasi Kumbang (Tmpk) diendapkan secara menjari dengan Formasi Halang, menunjukkan kesinambungan proses turbidit. Pada kala Holosen, aktivitas vulkanik Gunung menghasilkan endapan lava andesit (Qvls). Evolusi geologi Belik mencerminkan proses sedimentasi laut dalam, intrusi magma, dan vulkanisme berulang yang membentuk sejarah pengendapan kompleks di utara Cekungan Serayu.
Diagenetic Controls on Porosity in Sandstones of the Talang Akar Formation: A Case Study from the Rambangnia River Track, South OKU, South Sumatra Yogie Zulkurnia Rochmana; Stevanus Nalendra Jati; Mega Puspita; Idarwati Idarwati; Ridho Pranata
Jurnal IPTEK Vol 29, No 1 (2025): May
Publisher : LPPM Institut Teknologi Adhi Tama Surabaya (ITATS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.iptek.2025.v29i1.6746

Abstract

Porosity contributes to fluid storage and determines reservoir quality. The higher the porosity, the more free space is available to store fluid. However, the porosity of reservoirs, particularly the sandstones of the Talang Akar Formation of the Rambangnia River track, is not always good. The diagenetic process in the formation of sandstones is thought to contribute to variations in porosity quality. This study aims to determine the control of diagenesis on the porosity of sandstones of the Talang Akar Formation of the Rambangnia River, South Sumatra. The research methods used were field observation, petrographic, diagenesis, and porosity analysis. Based on petrographic analysis, the study area has three types of sandstone: lithic wacke, sublitharenite, and litharenite. The study of diagenesis shows that the sandstones in the Rambangnia River’s Talang Akar Formation have gone through an intense compaction phase, dissolution, cementation by silica and calcite minerals, and an authigenic phase in clay minerals.  In general, the porosity of rocks in the study area ranges from fair to good.
Characteristic and Provenance of Talang Akar Formation Sandstone, Sukamoro Area, South Sumatera Yogie Zulkurnia Rochmana; Idarwati Idarwati; Harnani Harnani; Elisabet Dwi Mayasari
Jurnal IPTEK Vol 27, No 1 (2023): May
Publisher : LPPM Institut Teknologi Adhi Tama Surabaya (ITATS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.iptek.2023.v27i1.4434

Abstract

Sukamoro area, Banyuasin Regency, South Sumatera, was the research location. This investigation focuses on the origin of sandstones from the Talang Akar Formation. In the area of investigation, sandstones are widely dispersed and exhibit a variety of properties. Due to the abundance of sandstones found and their high resistance and physical compactness, an analysis of the original rock can be carried out. Generally, the material that makes up sandstone comes from the previous rock. This investigation was undertaken using a descriptive-analytical methodology to determine the origin of the rock. The collected surface data is subsequently petrographically examined. After determining the composition of the constituent minerals, a provenance analysis was conducted to determine that the Talang Akar Formation's sandstones originated from the Magmatic Arc. Furthermore, the Talang Akar sandstone reveals the origin of the Recycle Orogen. Thus, it is considered that the sandstones of the Talang Akar Formation have seen many uplift episodes as a result of tectonic activity, almost to the point where they have experienced an increase in the maturity or stability of their continental block provenances
Mekanisme Struktur Geologi Berdasarkan Analisis DEM dan Analisis Stereografis Daerah Banjaranyar Sekitarnya Kabupaten Ciamis Jawa Barat Felix Mateus Exaudi Gultom; Yogie Zulkurnia Rochmana
JURNAL TEKNIK GEOLOGI : Jurnal Ilmu Pengetahuan dan Teknologi Vol 8, No 2 (2025): Jurnal Teknik Geologi : Ilmu Pengetahuan dan Teknologi
Publisher : Teknik Geologi Fakultas Teknik Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/jtgeo.v8i2.22972

Abstract

Daerah Banjaranyar memiliki kondisi geologi yang kompleks, yang ditandai oleh adanya aktivitas tektonik yang memengaruhi bentuk morfologi permukaan serta perkembangan struktur geologi di wilayah tersebut. Analisis mekanisme struktur menjadi penting untuk memahami hubungan antara proses tektonik dan formasi batuan yang terjadi. Tujuan dilakukan penelitian ini untuk mengidentifikasi dan menggambarkan jenis, arah gaya utama, dan arah pergerakan struktur yang ada pada daerah penelitian. Metode yang digunakan pada penelitian ini berupa pendekatan integratif melalui analisis citra satelit (DEM) dengan melihat dan analisis stereografis menggunakan software Dips dan Win Tensor. Analisis stereografis juga menggunakan beberapa klasifikasi untuk menghasilkan data yang akurat seperti Klasifikasi Fossen dan Klasifikasi Rickard untuk penamaan sesar serta Klasifikasi Fossen dan Klasifikasi Nabavi dan Fossen untuk penamaan lipatan. Berdasarkan hasil pengamatan dan pengolahan data, terdapat struktur orde 1 yaitu Sesar Pasawahan, Antiklin Banjaranyar, Sinklin Pasawahan dengan arah orientasi Barat – Timur, dan struktur orde 2 yaitu Sesar Cigayam dengan arah orientasi Barat Laut – Tenggara.
Foraminifera Biostratigraphy and Paleobathymetry of the Ombilin Formation in the Sumpur Kudus Area, Sijunjung Regency, West Sumatra, Indonesia Febi Annisa; Budhi Setiawan; Yogie Zulkurnia Rochmana
Journal of Earth and Marine Technology (JEMT) Vol 6, No 2 (2026)
Publisher : Lembaga Penelititan dan Pengabdian kepada Masyarakat - Institut Teknologi Adhi Tama Suraba

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jemt.2026.v6i2.9187

Abstract

The Ombilin Formation in the Sumpur Kudus area, Sijunjung Regency, West Sumatra, is known for its abundance of foraminiferal fossils. However, studies on the relative age of the rock layers, particularly regarding paleobathymetry, still require more in-depth research. This study aims to determine the relative age and bathymetric environment of the Ombilin Formation. The research method used is foraminiferal microfossil analysis, which includes identifying planktonic and benthic foraminifera from rock samples in the study area. The data used consist of five carbonate rock samples. The results of the study indicate that the relative age of the Ombilin Formation in the Sumpur Kudus area, Sijunjung Regency, West Sumatra, based on planktonic foraminifera analysis, is Early Miocene (N5), and its bathymetric environment, based on benthic foraminifera analysis, is in the neritic margin to mid-neritic zone (11–175 fathoms). Thus, the results of this study not only confirm previous findings but also strengthen evidence regarding the relative age and depositional characteristics of the Ombilin Formation, in both regional and local contexts, thereby providing supporting data to understand the geological history and evolution of sedimentation in the Ombilin Basin.
Karakteristik Petrografi Batupasir Formasi Sangkarewang Daerah Talawi, Kota Sawahlunto, Sumatera Barat Ahmad Hafiz Nurmansyah; Budhi Setiawan; Yogie Zulkurnia Rochmana
Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal) Vol. 7 No. 3 (2026): August (Inpres)
Publisher : Mataram University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/goescienceed.v7i3.2571

Abstract

The Sangkarewang Formation is one of the Paleogene sedimentary units within the Ombilin Basin that developed in a lacustrine depositional system. Previous studies of the Sangkarewang Formation have mainly focused on stratigraphy, organic geochemistry, and depositional environment interpretation, while detailed investigations of the petrographic characteristics of its sandstone facies remain limited. This study aims to identify the petrographic characteristics of Sangkarewang Formation sandstones based on texture, mineral composition, porosity type, and sandstone classification. Three representative sandstone samples (BPSRG-01, BPSRG-02, and BPSRG-03) were analyzed using thin-section petrography under a polarizing microscope. The results show that the sandstones consist of very fine- to coarse-grained sediments with poor sorting and angular to sub-angular grains. The mineral composition is dominated by quartz, feldspar, and volcanic lithic fragments, indicating a contribution from volcanic-derived materials. Based on sandstone classification, samples BPSRG-01 and BPSRG-03 are classified as Arkosic Arenite, whereas BPSRG-02 is categorized as Feldspathic Wacke due to its higher matrix content. Intergranular porosity is observed in all samples, with variations controlled by grain packing and matrix abundance. These characteristics indicate that the Sangkarewang Formation sandstones were derived from relatively proximal sediment sources and experienced variations in sediment supply and depositional energy within a dynamic lacustrine system.
Co-Authors A. F. H. Surbakti` Abimanyu, Gilang Adamsyah, Bayu Ahmad Hafiz Nurmansyah Alpino, Muhammad Anisa Nurjanah, Anisa Anton Wijaya Apriliana, Vira Armandani, Aditya Raihan Atthoriq, Muhammad Hafidz Aulia, Khanaya Syafarah Az zahra', Salmaa Aulia Az-zahra, Salmaa Aulia Budhi Setiawan Chen, R. D. Daffa Gamas Elcofa Dyah Hastuti, Endang Wiwik E. W. D. Hastuti Elisabet Dwi Mayasari Endang Wiwik Dyah Hastuti Endang Wiwik Dyah Hastuti Erisendy, Maretha Deva Ersyari, J. Febi Annisa Felix Mateus Exaudi Gultom Giantaria, Anisa Harfiandri, Muhammad Said Harnani Harnani Harnani Harnani Hastuti, E. W. D. Helen Dwi Putri Hibatullah, Kevin Nabil Idarwati Idarwati Ismaryanto, Ismaryanto J. Ersyari Kevin Nabil Hibatullah Lestari, Suci Febria M Arief Situmorang M. Rafi Maretha Deva Erisendy Mega Puspita Muhammad Aghil Ikhwanulsyah Muhammad Al Fajrin Khalil Gibran Muhammad Alif Setiawan Muhammad Daffa Kevin Adam Muhammad Hafidz Atthoriq Muhammad Raihan Mustaqim Novita, A. F. Permana, Lano Adhitya Pranata, Ridho Putra, Hanif Kurniadi Putri, Helen Dwi R. D. Chen R. G. Utamaputra Rahmatullah, Arif Ramadan, Ikdan Rifki Muhamad Ridho Pranata Stevanus Nalendra Jati Sunarta, Jonathan Angkawijaya Surbakti`, A. F. H. Utamaputra, R. G. Wicaksono, M Dwiki Satrio Wicaksono, M. Dwiki Satrio