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All Journal Bulletin of Scientific Contribution : Geology Journal of Geosciences and Applied Geology
Febriwan Mohamad, Febriwan
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Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Energy Engineering Environmental Science

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OPTIMASI BERAT LUMPUR PENGEBORAN DENGAN ANALISIS TEKANAN PORI DAN GRADIEN REKAH PADA LAPANGAN RZZ, FORMASI, BALIKPAPAN, CEKUNGAN KUTAI Zahran, Raihan Zaki; Abdurrokhim, Abdurrokhim; Mohamad, Febriwan; Nursasono, Danny
Bulletin of Scientific Contribution Vol 22, No 2 (2024): 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.v22i2.56154

Abstract

Analisis tekanan pori dan gradien rekah adalah proses penting dalam pengeboran minyak dan gas untuk memprediksi tekanan yang terjadi di dalam sumur dan mencegah kejadian bencana pengeboran. Analisis ini berlokasi di lapangan RZZ sebagai salah satu lapangan produksi minyak dan gas alam pada Kalimantan Timur. Tujuan penelitian ini untuk mengetahui karakterisitik tekanan pori agar dapat menentukan metode yang tepat dalam optimasi berat lumpur pengeboran. Penelitian ini menggunakan data dari 14 sumur, berupa data log tali kawat, PTFA, LOT atau FIT, laporan pengeboran, mud log, interval velocity, dan Ro. Penelitian ini menggunakan metode Eaton (Eaton, 1975) pada analisis tekanan pori dan gradien rekah serta metode statistika pada optimasi berat lumpur. Hasil penelitian menunjukkan bahwa kedalaman top overpressure berada pada rentang 9,850 – 11,000 ftTVD pada Formasi Balikpapan dan top hard overpressure pada rentang 12,000 – 13,000 ftTVD pada Formasi Balikpapan juga. Hasil korelasi menunjukkan distribusi overpressure mengikuti struktur geologi yang berkembang yakni antiklin. Overpressure pada daerah penelitian disebabkan oleh mekanisme loading dan unloading. Mekanisme loading dibuktikan berdasarkan analisis sejarah pemendaman, sedangkan mekanisme unloading dibuktikan oleh plot silang Dutta (Dutta, 2002) dan nilai Ro. Optimasi berat lumpur pada section 12 ¼” dilakukan dengan cara menaikkan berat lumpur menjadi 2.65 ppg dari tekanan pori untuk menanggulangi permasalahan tight spot dan overpull. Sedangkan pada section 8 ½” dengan cara menurunkan berat lumpur menjadi 2.5-3.5 ppg dari tekanan pori untuk menanggulangi high gas. Penggunaan berat lumpur optimum ini akan meminimalisir terjadi permasalahan saat pengeboran sehingga pengeboran menjadi lebih efektif dan efisien.Kata Kunci: Tekanan Pori, Overpressure, Berat Lumpur, Mekanisme, Optimasi
Carbonate Facies and Depositional Environment On Baturaja Formation, “Mk” Field, Jatibarang Sub-Basin. Manwarjit, Manwarjit; Syafri, Ildrem; Mohamad, Febriwan; Ginanjar, Asep
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.v5i3.35462

Abstract

Facies are defined as a rock body that have a combination of characteristics that are related to the physical, biological, or chemical aspects seen from rock lithology, sedimentary structures that distinguish the rock body from the rocks above, below or laterally in other parts (Walker, 1992). This paper aimed to determine the facies and depositional environment that developed in the upper part of Baturaja Formation. The facies distribution analysis can be used as an early interpretation for the characterization of carbonate reservoir. In this research, the facies and depositional environment analysis is carried out by integrating core data, thin section, and wireline log. Based on this analysis, it is identified that 4 facies were deposited in 4 different types of depositional environment and time, which are Facies Floatstone (Facies I), Facies Wackstone- Packstone (Facies II), Facies Floatstone- Framestone (Facies III), dan Facies Floatstone- Rudstone (Facies IV). All facies are correlated to every well using electrofacies analysis so that the facies distribution on every well can be shown. The output of facies distribution can be illustrated into a cross-section of well-correlation.Keywords:  Characterization, Facies distribution, Electrofacies, Well-correlation  
CARBON CAPTURE AND STORAGE (CCS) POTENTIAL AT LOW-RESISTIVITY RESERVOIR USING PETROPHYSICAL ANALYSIS AT "SOKA JINGGA" FIELD, TALANG AKAR FORMATION, ASRI BASIN Yusriyah, Dzakiyah; Syafri, Ildrem; Mohamad, Febriwan; Ralanarko, Dwandari; Aprillia, Belinda Rizka
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.v8i1.56477

Abstract

Carbon Capture and Storage (CCS) is a new technology that uses subsurface reservoirs to reduce carbon dioxide emissions by storing it below the surface. PT XYX conducted a comprehensive exploration of the CCS potential in Indonesia. The “Soka Jingga” Field, located at Talang Akar Formation, Asri Basin, is a potential candidate for CCS. The “Soka Jingga” Field has low resistivity reservoirs. There are five wells at “Soka Jingga” Field, namely DZ-1, DZ-2, DZ-3, DZ-4, and DZ-5. The objective of this study is to assess the CCS potential in the laminated sand interval of the “Soka Jingga” Field. The research method used is petrophysical analysis. The petrophysical data processing results show porosity values ranging from 23% to 35.5% with a net reservoir thickness ranging from 5.25 ft to 65 ft. The highest capacity was found in DZ-4 in the Zelda Member Zone 3, amounting to 37,923,654,924.52 kg or 37,923,654.92 tonnes. Summing the total capacity at "Soka Jingga" Field, the total CO2 storage capacity in the research area is 125,169,497,575.91 kg or 125,169,497.58 tonnes.
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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (604.331 KB) | DOI: 10.24198/bsc.v13i3.8411

Abstract

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.
POTENSI AKUIFER KAMPUS ARJASARI BERDASARKAN PENGAMATAN NILAI TAHAN JENIS BATUAN Mohamad, Febriwan; Mardiana, Undang; Yuniardi, Yuyun; Nur, Andi Agus; Alfadli, Muhammad Kurniawan
Bulletin of Scientific Contribution Vol 15, No 2 (2017): Bulletin of Scientific Contribution GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (643.285 KB) | DOI: 10.24198/bsc.v15i2.13383

Abstract

ABSTRACTGeoelectric measurement was done in order to obtain the presence, depth, thickness, quantity and distribution of aquifers in the study area. Geoelectric was done by applying 1-D Schlumberger configuration (DC sounding). Rock layer with a resistivity value ranges <20 μm indicates rocks with low resistance values, dominates the surface until 50 meters depth with varying thickness. This layer lithology thought to be composed of weathered soil, fine tuff and lapilli tuff. This layer is assumed to act as aquiclude, porous media that can store water but acts as barrier to the flow of groundwater. This lithology group can be filled by water during the rainy season, but in dry season contain very small amount of water. Rock layer with resistivity value ranges between 20 μm - 60 μm interpreted as coarse tuff intercalating with fine tuff, founded at 75 meters depths below the surface. Rock layers with high resistance values (> 60 μm), founded more than 75 meters in the north area, assumed to be volcanic breccia with tuff as matrix, and have small potential to act as aquifer. Keyword: Geoelectric, Schlumberger, Aquifer, Resistivity ABSTRAKPengukuran geolistrik yang dilakukan dalam upaya untuk mendapatkan kehadiran, kedalaman, ketebalan, jumlah dan penyebaran akuifer. Hasil  pengukuran geolistrik (Sounding) dengan konfigurasi Schlumberger Kelompok batuan dengan nilai tahanan jenis berkisar antara  <20 Wm yang mengindikasikan batuan dengan nilai tahanan jenis rendah mendominasi permukaan hingga kedalaman 50 meter dengan ketebalan bervariasi. Lapisan ini diduga memiliki litologi penyusun terdiri atas tanah lapukan, tuf halus dan tuf lapili. Lapisan ini diduga berperan sebagai akiklud, yaitu media berpori yang dapat menyimpan air tetapi tidak dapat mengalirkan airtanah yang dapat terisi oleh air pada musim hujan, namun pada musim kering tidak mengandung air. Lapisan batuan dengan nilai tahanan jenis antara 20 Wm - 60 Wm  diinterpretasi litologi tuf kasar berselingan dengan tuf halus, berada pada kedalaman mulai 75 meter di bawah permukaan. Lapisan batuan dengan nilai tahanan jenis tinggi (>60 Wm), mulai di kedalaman lebih dari 75 meter di bagian utara diperkirakan breksi vulkanik dengan matriks berupa tuf, dan memiliki potensi kecil sebagai akuifer. Kata Kunci: Geolistrik, Schlumberger, Akifer, Resistivitas
THE INFLUENCE OF SEDIMENTATION ON SALINITY VARIATION IN THE EAST KUTAI BASIN, EAST KALIMANTAN, INDONESIA Yuniardi, Yuyun; MOHAMAD, FEBRIWAN; Alfadli, Muhammad Kurniawan
Journal of Geological Sciences and Applied Geology Vol 9, No 1 (2026): Journal of Geological Sciences and Applied Geology
Publisher : Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v9i1.69433

Abstract

The East Kutai Basin is a major deltaic system developed under strong river-dominated sedimentary processes, characterized by long-term progradation from marine to terrestrial environments. In such deltaic settings, salinity distribution is generally expected to show systematic lateral and vertical trends, with freshwater dominating proximal facies and saline water occurring in distal marine facies, while salinity commonly increases with depth due to depositional progradation through time. This study investigates lateral and vertical salinity variations in the East Kutai Basin and evaluates their relationship with sedimentary facies distribution. Salinity data were derived from both formation water analysis and apparent water resistivity (Rwa) calculations using resistivity logs based on Archie’s equation. These data were integrated with net sand maps and electrofacies interpretations to analyze salinity patterns across multiple stratigraphic layers. The results indicate that although the general lateral salinity trend from low salinity in channel facies to higher salinity in mouth bar facies is preserved, significant anomalies are present. Laterally, mouth bar deposits locally exhibit unexpectedly low salinity values, approaching those of channel facies. Vertically, salinity decreases with increasing depth in several stratigraphic groups, contradicting the expected progradational model. These anomalies are interpreted to result from lateral shifting of depositional environments due to progradation and expulsion of low-salinity compaction water from overpressured prodelta shale into adjacent sand bodies.
Co-Authors Abdurrokhim ⠀ Andi Agus Nur, Andi Agus Aprillia, Belinda Rizka Ginanjar, Asep Ildrem Syafri Manwarjit, Manwarjit Muhammad Kurniawan Alfadli Nursasono, Danny Ralanarko, Dwandari Undang Mardiana Yusi Firmansyah, Yusi Yusriyah, Dzakiyah Yuyun Yuniardi Zahran, Raihan Zaki