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All Journal Jurnal RISET Geologi dan Pertambangan Journal of Degraded and Mining Lands Management Jurnal Teknologi Mineral dan Batubara BULLETIN OF THE MARINE GEOLOGY Buletin Sumber Daya Geologi Majalah Ilmiah Pengkajian Industri Jambura Geoscience Review Jurnal Geominerba Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources) Jurnal Teknologi Mineral dan Batubara Scientific Contributions Oil and Gas
Agus Didit Haryanto
Fakultas Teknik Geologi, Universitas Padjadjaran
Aerospace Engineering Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Earth & Planetary Sciences Education Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Transportation Other

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EVALUASI KONDISI RESERVOIR BERDASARKAN MONITORING GEOKIMIA FLUIDA PADA SUMUR PRODUKSI AGS-2 DAN AGS-8 LAPANGAN PANAS BUMI PATUHA, JAWA BARAT Ari Gunawan Sentosa; Agus Didit Haryanto; Dewi Gentana; Hendy Sujarmaitanto
JURNAL GEOMINERBA (JURNAL GEOLOGI, MINERAL DAN BATUBARA) Vol 7 No 2 (2022): Jurnal Geominerba 2022
Publisher : PPSDM Geominerba

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58522/ppsdm22.v7i2.102

Abstract

Patuha Geothermal Field is a vapor-dominated fluid system that mostly produces dry steam which associated with Quaternary Patuha Volcano. This field is located in Bandung Regency, West Java and has been exploited since 2014. This exploitation can cause changes in fluid characteristics of reservoir therefore the monitoring activity is carried out to identify these changes. This study uses fluid chemistry and tracer flow test data from two production wells, AGS-2 and AGS-8. The method used is a geochemical analysis of geothermal fluids. The results showed that the fluid from these wells are still influenced by magmatic volatiles which AGS-8 shows higher intensity than AGS-2. The concentration of non-condensable gases (NCG) has decreased since the start of exploitation, indicates that the boiling process is still ongoing in reservoir. AGS-2 well has meteoric water influx which causes the low value of dryness and enthalpy ​​also high potential of silica scaling compared to AGS-8.
Contribution of Resistivity Properties in Estimating Hydraulic Conductivity in Ciremai Volcanic Deposits Deden Zaenudin Mutaqin; Hendarmawan Hendarmawan; Agus Didit Haryanto; Undang Mardiana; Febriwan Mohammad
Jambura Geoscience Review Vol 5, No 1 (2023): Jambura Geoscience Review (JGEOSREV)
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34312/jgeosrev.v5i1.17333

Abstract

The hydraulic parameters of porous media, such as porosity (φ) and hydraulic conductivity (K), are the most important factors for planning and managing water exploitation from aquifers. This study aims to estimate the hydraulic conductivity parameters using the geoelectric method on volcanic deposits on the northern slope of Mount Ciremai. For this purpose, four data types were used to estimate K and φ, including lithological profiles, water table, groundwater quality, pumping test data, and vertical electrical sounding (VES). Based on Archie's law and Kozeny's equation, we get the alpha (α) values and cementation factor (m) from which the median values of α = 1.01 and m = 1.36 represent the studied aquifer.  The porosity (φ) of the aquifer varies from 0.097 to 0.187 with an average of 0.141 and is spatially related to the hydraulic conductivity (kgm), which varies from 4.97 × 10-6 to 6.75 × 10-5 m/s after the application of Kozeny's equation. The hydraulic conductivity (Kp) calculated from the pumping tests varies from 9.07 × 10-6 to 1.06 × 10-4 m/s and is strongly correlated (r = 0.87). Furthermore, a relation between resistivity and hydraulic conductivity was established for the studied aquifer to estimate these parameters in sites lacking data.
The impact of digital elevation models resolution on tectonic activity assessment based on morphotectonic indices: a case study of Seulawah Agam Volcano, Indonesia Muhammad Ronggour Pardamean Siahaan; Emi Sukiyah; Nana Sulaksana; Agus Didit Haryanto
Journal of Degraded and Mining Lands Management Vol 10, No 3 (2023)
Publisher : Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15243/jdmlm.2023.103.4445

Abstract

The Digital Elevation Number (DEM) is the main tool for quantitative geomorphological tests. Furthermore, Shuttle Radar Topography Mission (SRTM) images with a resolution of 30 m have been widely used as a source of DEM data in geomorphological studies, while DEMNAS (National DEM) images with 8 m are rarely used. Both images can identify typical volcanic morphology based on a visual comparison of hillshade with certain variations in slope. The objective of this study was to determine the feasibility of DEM for tectonic activity assessment based on morphotectonic indices. In this study, geomorphological comparisons were carried out on twelve watersheds in the Seulawah Agam Volcano (SAV). The data extraction of DEM resulted in the total area and perimeter, namely 486.8 km2 and 455 km (SRTM), as well as 482.8 km2 and 460.3 km (DEMNAS). The total segments up to the 4th order and the resulting lengths were 290 and 512.8 km for SRTM, while DEMNAS were 527 and 711.7 km. The morphotectonic variables used included drainage density, bifurcation, circularity, and valley floor ratio, as well as basin shape index. The results of these parameter calculations using mean values of SRTM imagery showed very coarse textures, deformed, more elongated, moderate tectonic, and low uplift. On the other hand, those of DEMNAS imagery showed coarse textures, not-deformed, more elongated, low tectonic, and low uplift of the basin’s characteristics.
Karakteristik dan Petrogenesis Batuan Beku di Kecamatan Cisolok (Daerah Geopark Ciletuh-Palabuhanratu), Kabupaten Sukabumi Asti Gindasari; Mega Fatimah Rosana; Agus Didit Haryanto
Jurnal Geologi dan Sumberdaya Mineral Vol. 23 No. 3 (2022): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v23i3.692

Abstract

Lokasi studi yang terletak di daerah Ciletuh merupakan bagian dari Unesco Global Geopark dicirikan oleh batuan beku intrusif dan ekstrusif berumur Miosen. Batuan beku ini tersebar di sepanjang pantai dan sebagian membentuk perbukitan kecil. Tujuan studi ini adalah untuk mengkarakterisasi dan mengetahui petrogenesis dari batuan beku yang ada di daerah Cisolok. Metode kegiatan yang dilakukan menggunakan analisis petrografi, geokimia, XRF dan ICP-MS. Secara petrografis batuan dapat dikelompokkan menjadi batuan andesit porfiri dan dasit porfiri. Analisis kimia menunjukkan bahwa karakteristik batuan beku dibedakan menjadi jenis dasit, andesit, andesit basaltik, dan basal. Magma sebagai sumber pembentukan batuan beku memiliki komposisi metaluminous dari jenis magma seri calc alkaline, kecuali untuk contoh dari Pasir Randu yang merupakan jenis high-K calc alkaline series. Batuan tersebut terbentuk pada zona lingkungan subduksi dengan posisi continent arc, yang termasuk dalam tepi kontinen aktif.Katakunci: Batuan beku, Cisolok, geopark Ciletuh Palabuhanratu.
PENGARUH TEMPERATUR DAN UKURAN BUTIR TERHADAP KELARUTAN KALIUM PADA BATUAN LEUSITIK GUNUNG MURIA JAWA TENGAH Budhy Agung; Ildrem Syafri; Agus Didit Haryanto
Jurnal Teknologi Mineral dan Batubara Vol 15 No 2 (2019): Jurnal Teknologi Mineral dan Batubara Edisi Mei 2019
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/jtmb.Vol15.No2.2019.1002

Abstract

Mineral yang berpotensi di bidang pertanian sebagai sumber unsur hara (pupuk) yang dibutuhkan tanaman adalah dolomit, batuan fosfat, dan mineral silikat seperti leusit, muskovit dan ortoklas. Leusit mengandung kalium dan aluminium tektosilikat K(AlSi2O6). Mineral ini dijumpai di Kabupaten Jepara, Pati dan Kudus. Di Medani, Jepara potensinya sebanyak 190.400.000 ton, kandungan K2O antara 1,92-8,77 %. Mineral leusit untuk penelitian ini mempunyai kadar K20 antara 7,68-7,98 %; Al2O3 19,62-20,73 % dan SiO2 48,62-49,93 %. Hasil analisis petrografi menunjukkan adanya fenokris yang terdiri dari leusit, sanidin dan mineral opak. Unsur kalium di dalam leusit sulit larut, sehingga perlu diupayakan peningkatan kelarutannya dengan cara memanaskan batuan mengandung leusit tersebut pada suhu 600-1000 °C dan penghalusan ukuran butiran dari -70 sampai -200 mesh. Sebagai pembanding digunakan percontoh tanpa pemanasan. Dari hasil uji coba, kelarutan tanpa pemanasan relatif rendah antara 0,22-0,49 %; semakin halus butiran kelarutan leusit cenderung semakin meningkat, tetapi pada suhu 600 °C terjadi peningkatan cukup signifikan antara 1,55-2,30 %, pada suhu 700 °C kelarutan relatif tetap yaitu antara 1,44-2,40 %, sedangkan pada suhu 850 °C mulai terjadi penurunan kelarutan menjadi 1,20-1,95 % dan pada suhu lebih tinggi 1000 °C, kelarutan menurun menjadi 0,31-0,45 %. Percobaan peningkatan kelarutan kalium cukup signifikan sampai 10 kali, diharapkan kegunaan untuk pupuk lebih baik.
PRESISI PENGUKURAN PRODUK SAMPING TAMBANG TIMAH NUDUR MENGGUNAKAN ANALISIS XRF DAN PELUANG EKONOMI PRODUKNYA Ronaldo Irzon; Kurnia Kurnia; Agus Didit Haryanto
Jurnal Teknologi Mineral dan Batubara Vol 16 No 2 (2020): Jurnal Teknologi Mineral dan Batubara Edisi Mei 2020
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/jtmb.Vol16.No2.2020.1089

Abstract

Penambangan timah hasil intrusi granit tipe-S di Pulau Bangka yang dimulai sejak periode kolonial Belanda menghasilkan produk samping. Presisi, akurasi, dan reproduktivitas dibutuhkan untuk memverifikasi hasil pengukuran perangkat analisis yang memang diperlukan dalam perkembangan ilmu kebumian. Perangkat X-ray fluorescence pada umumnya diaplikasikan untuk mengukur kandungan oksida utama dan beberapa unsur jejak yang memiliki kelimpahan tinggi. Presisi pengukuran oksida utama, unsur jejak, berikut logam tanah jarang pada percontoh produk samping penambangan timah milik PT Timah di Nudur, Pulau Bangka, menggunakan XRF adalah tujuan penelitian ini. Informasi mengenai manfaat ekonomis material sisa penambangan tersebut juga dapat diketahui melalui studi ini sehingga dapat menjadi landasan kebijakan bagi pemerintah maupun PT Timah. Seluruh analit terbukti presisi berdasarkan prinsip RSD <2/3 kali RSDHorwitz, kecuali MgO, CaO, Mo, Cr, dan Zn. Bahan sisa penambangan ini masih cukup ekonomis. Terdapat indikasi awal bahwa titanit dan malayait hadir bersama pada granit pembawa timah di Nudur berdasarkan komposisi geokimia percontoh yang dipelajari.
Development of a New Empirical Formula Using Machine Learning for Pore Pressure Prediction in the South Sumatera Basin Aly Rasyid; Hendarmawan; Agus Didit Haryanto; Cipta Endyana
Scientific Contributions Oil and Gas Vol 48 No 3 (2025)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/scog.v48i3.1885

Abstract

Accurate pore pressure prediction is crucial for maintaining wellbore stability and preventing drilling hazards. Therefore, this research aimed to present a new empirical method derived from machine learning models, applied to two wells in South Sumatra Basin (S-3 and S-4) comprising 214 depth intervals. The method integrated geomechanics principles, statistical correlation analysis, and neural network optimization to generate an interpretable and transferable equation. The internal parameters of the trained model were extracted and reformulated into a transparent empirical expression that engineers could apply directly in practice. This was distinct from the conventional black-box artificial neural network (ANN). Model performance was rigorously validated against analytical pore pressure measurements. Additionally, the method achieved strong predictive accuracy, with coefficients of determination (R²) of 0.94 and 0.91 for S-3 and for S-4, and root mean square error (RMSE) of 115 psi and 142 psi, respectively. These values represented a significant improvement compared to traditional methods. For example ANN-derived formula reduced RMSE by 28% and 22% in contrast to Eaton’s equation and the Bowers velocity–effective stress relationship. It also outperformed Normal Compaction Trendline (NCT) method in intervals with abrupt lithological changes. The clear identification of significant predictors, namelytemperature, gamma ray, porosity, and water saturation, helped bridges the gap between machine learning accuracy and engineering usability. The results showed that converting advanced computational models into interpretable tools significantly enhanced operational safety, reduced non-productive time, and improved drilling efficiency in Indonesian most prolific hydrocarbon provinces.
Co-Authors Aly Rasyid Ari Gunawan Sentosa Asti Gindasari Azizi, Hisyam Azhar Budhy Agung Cipta Endyana Deden Zaenudin Mutaqin Dewi Gentana Dicky Muslim Emi Sukiyah Euis Tintin Yuningsih Fauzan Thaha Assegaf Febriwan Mohammad Haris Siagian Hendarmawan Hendarmawan Hendarmawan Hendy Sujarmaitanto Ildrem Syafri Iwan Setiawan Johanes Hutabarat Khilal Khoiri Polanunu Kurnia Kurnia Kurnia Miharja Mega Fatimah Rosana Muhammad Ronggour Pardamean Siahaan Nana Sulaksana Nisa Nurul Ilmi Purbiyantoro, Aldila Jasmine Purnama Sendjaja Ronaldo Irzon Ronaldo Irzon Ronaldo Irzon Ryan Hidayat Undang Mardiana Vijaya Isnaniawardhani Vina Oktaviany Yudi Darlan