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All Journal Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources) BULLETIN OF THE MARINE GEOLOGY
Yulinar Firdaus, Yulinar
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Earth & Planetary Sciences Education Energy Engineering Environmental Science

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Depositional Modification In Seram Through, Eastern Indonesia Kusnida, Dida; Naibaho, Tommy; Firdaus, Yulinar
Jurnal Geologi dan Sumberdaya Mineral Vol 17, No 2 (2016): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (260.569 KB)

Abstract

Seismic reflection profiles considered to represent the morphotectonics of the study area and verified by surficial sedimentary data presented in this paper directed to understand  the sedimentary depositional dynamics.  Seismic data interpretation results show the gradation and sediment facies cycles in accordance with the episode of tectonic activities, which is characterized by the avalanche of the Seram Trough base-of slopes materials. Seismic data reveal more than 1250 meters acoustically chaotic to laminated, indicate fine-grained sediments between slumps at its base of slope and fine marine sediments at the trough floor. Thus, it suggests that the Seram Trough is in the process of differential vertical movement causing depositional modification due to the accretionary prism growths.
GRAVITY MODELING OF SUBSURFACE STRUCTURES AND RESERVOIR CHARACTERIZATION USING SEISMIC INVERSION IN THE NIAS BASIN Wibowo, Ramadhana; Setiadi, Imam; Firdaus, Yulinar; Rahardiawan, Riza
BULLETIN OF THE MARINE GEOLOGY Vol 39, No 2 (2024)
Publisher : Marine Geological Institute of Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32693/bomg.39.2.2024.890

Abstract

The development of interpretation techniques opens new exploration opportunities in the forearc basins of western Indonesia, such as the Nias Basin which show signs of oil and gas seepage. Gravity and seismic inversion analysis were used to look into the Nias Basin in order to evaluate its subsurface structure, the location of sedimentary sub-basins, and the possible presence of hydrocarbon reservoirs. After filtering the data for the Complete Bouguer Anomaly (CBA), a residual anomaly was obtained. This allowed for the quantitative interpretation of structures below the surface using 2D gravity forward modelling. Seismic and well data interpretation includes sensitivity analysis, a well-seismic tie, picking horizons, and acoustic impedance (AI) inversion. The residual gravity anomaly reveals eight sub-basin patterns spread out in the Nias Basin with a relative continuity direction of northwest-southeast following the lineaments of basement highs. The subsurface geological model identified four rock formations. From deepest to shallowest, these units are metamorphic bedrock (2.7 g/cc), Lelematua Formation (2.5 g/cc), Gomo Formation (2.4 g/cc), and Gunungsitoli Formation with an overlying alluvium (2.25 g/cc). Interpretation of well and seismic suggests a target zone at a 2,017 – 2,101 meters depth. Using a model-based hard constraint for AI inversion in this zone indicates possible carbonate reservoirs. Based on sensitivity analysis with an interval of 34,000 - 47,000 (ft/s)*(g/cc), an AI cutoff value of more than 34,000 (ft/s)*(g/cc) was obtained. The carbonate is estimated to be a tight carbonate in the limestone of the Gomo Formation.
FORAMINIFERA DISTRIBUTION AS AN INDICATOR OF PALEOCEANOGRAPHY IN WAIPOGA WATERS, NORTHERN PAPUA Wijaya, Joleen Felicia; Jatiningrum, Resti Samyati; Gustiantini, Luli; Putri, Mardhatillah Kurnia; Firdaus, Yulinar
BULLETIN OF THE MARINE GEOLOGY Vol 40, No 2 (2025)
Publisher : Marine Geological Institute of Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32693/bomg.40.2.2025.965

Abstract

Foraminifera are widely used as indicators for reconstructing past marine environmental conditions. This study aims to investigate the ecological conditions of Waipoga waters, North Papua, by analyzing the distribution of foraminifera during the late Middle Holocene to Late Holocene. The study area plays an important role in the dynamics of the Indonesian Throughflow (ITF/ITF) and ENSO. Sediment core samples were prepared and identified for foraminifera, followed by quantitative analyses including relative abundance, P/B ratio, and ecological indices. In addition, sortable silt analysis was applied as an environmental proxy to support the reconstruction of past environmental changes. The results show that foraminiferal abundance throughout the sediment core varies. Planktonic foraminifera are more dominant, comprising 12 genera with 22 species. The most dominant species are Globigerinoides ruber (41,7%), Neogloboquadrina dutertrei (11%), Neogloboquadrina incompta (13,2%), Pulleniatina obliquiloculata (4%), Hastigerina pelagica (6,65%), and Globigerinoides immaturus (6,7%). Meanwhile, benthic foraminifera consist of 42 genera with 62 species, dominated by Bulimina marginata (1,8%), Cibicidoides pachyderma (1,89%), and Lenticulina calcar (1,3%). During the late Middle Holocene to Late Holocene, the Waipoga waters were influenced by variations in bottom current intensity and thermocline stability. Zones I and III reflect oligotrophic conditions with weak circulation, while Zone II indicates increased bottom current intensity, high productivity, and dysoxic conditions, suggesting possible intensification of upwelling events.
HYDROCARBON POTENTIAL OF THE OFFSHORE AKIMEUGAH BASIN FROM MESOZOIC-PALEOZOIC BASED ON GEOLOGICAL AND GEOPHYSICAL ANALYSIS Setiadi, Imam; Rasyid, Faris N; Zulivandama, Shaska Ramadhan; Firdaus, Yulinar; Santy, Lauty D.; Saleh, Hanif M.; Rachman, Muhammad G.; Djaja, Andrian W.; Nurdin, Nazar; Rahardiawan, Riza; Subarsyah, Subarsyah
BULLETIN OF THE MARINE GEOLOGY Vol 40, No 2 (2025)
Publisher : Marine Geological Institute of Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32693/bomg.40.2.2025.954

Abstract

Akimeugah Basin is one of the basins with discovery status, however hydrocarbon production has not yet been established. One of potential petroleum play type for further investigation, estimated to contain hydrocarbon reserves in the offshore Akimeugah Basin, is the Mesozoic–Paleozoic sedimentary play, interpreted to have originated from the Australian passive margin. This study aims to analyze geological and geophysical data to delineate the sub-basin pattern and characterize petroleum system elements. The analysis integrates gravity data interpretation, geochemical evaluation of source rocks, and subsurface interpretation based on seismic and well data. Results indicate that source rocks in the Kola-1 well are primarily composed of Type III (gas-prone) and secondarily of Type II (oil/gas-prone) kerogen. Thermal maturity analysis shows that the Woniwogi, Aiduna, and Modio Formations have reached the oil window. Reservoir potential has been identified in the Tipuma Formation (Triassic), Aiduna Formation (Permian), and Modio Dolomite (Devonian–Silurian). Seal rocks consist of regional and intraformational units composed of tight siltstone and shale. Trapping mechanisms in this area include a combination of structural traps such as fault-bounded anticlines and stratigraphic traps represented by sub-unconformities. Identified exploration leads include seven within the Modio Dolomite structural play, six within the Permian Aiduna Sandstone play, and four within the Triassic Tipuma Sandstone play.
Co-Authors Dida Kusnida Djaja, Andrian W. Gustiantini, Luli Henry Munandar Manik Imam Setiadi, Imam Jatiningrum, Resti Samyati Kusdiana, Dias Nainggolan, Tumpal Bernhard Nazar Nurdin Nurulsabila, Syifa Putri, Mardhatillah Kurnia Rachman, Muhammad G. Rasyid, Faris N Riza Rahardiawan Saleh, Hanif M. Santy, Lauty D. Subarsyah Subarsyah Tommy Naibaho, Tommy Wibowo, Ramadhana Wijaya, Joleen Felicia Zulivandama, Shaska Ramadhan