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KARAKTERISASI BATUAN INDUK HIDROKARBON DAN RESERVOAR NONKONVENSIONAL DI CEKUNGAN JAWA TIMUR BAGIAN UTARA: CHARACTERIZATION OF HYDROCARBON SOURCE ROCKS AND UNCONVENTIONAL RESERVOIR IN THE NORTHERN EAST JAVA BASIN Airlangga, Feby; Handoyo, Handoyo; Irawati, Selvi Misnia; Wibowo, Andy Setyo
Buletin Sumber Daya Geologi Vol 19 No 3 (2024): Buletin Sumber Daya Geologi
Publisher : Pusat Sumber Daya Mineral Batubara dan Panas Bumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47599/bsdg.v19i3.435

The northern East Java Basin is one of the hydrocarbon producing basins in Indonesia with a thick source rock layer and is interesting to study as a potential unconventional reservoir in the future. In this research, integration of well data analysis and seismic inversion is used to identify the characteristics of the source rock in the studied area. Well data analysis can provide lithological information from the source rocks bearing formations, namely shale of the Prupuh Formation, dominant shale of the Kranji Formation, and limestone of the Ngimbang Formation. In addition, log data can provide information on predicting Brittleness Index (BI) and Total Organic Carbon (TOC) values in the target zone. The linear regression is used to propagate BI, porosity, and TOC on the seismic data. To assist the process of distributing TOC and BI values on seismic parameters, Acoustic Impedance (AI) inversion was carried out by using a model based hard constraint method to predict the AI distribution. The results of this study show that the target zone is a potential zone with a medium to potential category with a TOC distribution of 1.5%-2.2%, BI of 0.2-0.46, and porosity of 0.03-0.15. Moreover, seismic inversion data also helps the distribution of petrophysical parameters in good lateral conditions following the distribution of shale source rock horizons.

KARAKTERISASI BATUAN INDUK HIDROKARBON DAN RESERVOAR NONKONVENSIONAL DI CEKUNGAN JAWA TIMUR BAGIAN UTARA: CHARACTERIZATION OF HYDROCARBON SOURCE ROCKS AND UNCONVENTIONAL RESERVOIR IN THE NORTHERN EAST JAVA BASIN Airlangga, Feby; Irawati, Selvi Misnia; Wibowo, Andy Setyo; Handoyo, Handoyo
Buletin Sumber Daya Geologi Vol 19 No 3 (2024): Buletin Sumber Daya Geologi
Publisher : Pusat Sumber Daya Mineral Batubara dan Panas Bumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47599/bsdg.v19i3.435

The northern East Java Basin is one of the hydrocarbon producing basins in Indonesia with a thick source rock layer and is interesting to study as a potential unconventional reservoir in the future. In this research, integration of well data analysis and seismic inversion is used to identify the characteristics of the source rock in the studied area. Well data analysis can provide lithological information from the source rocks bearing formations, namely shale of the Prupuh Formation, dominant shale of the Kranji Formation, and limestone of the Ngimbang Formation. In addition, log data can provide information on predicting Brittleness Index (BI) and Total Organic Carbon (TOC) values in the target zone. The linear regression is used to propagate BI, porosity, and TOC on the seismic data. To assist the process of distributing TOC and BI values on seismic parameters, Acoustic Impedance (AI) inversion was carried out by using a model based hard constraint method to predict the AI distribution. The results of this study show that the target zone is a potential zone with a medium to potential category with a TOC distribution of 1.5%-2.2%, BI of 0.2-0.46, and porosity of 0.03-0.15. Moreover, seismic inversion data also helps the distribution of petrophysical parameters in good lateral conditions following the distribution of shale source rock horizons.

Reservoir Characterization of Ngrayong Formation, Sandstone with Carbonate Intercalation, Using a Geostatistical Approach Based on Petrophysical Parameters, Northeast Java Basin, Indonesia Handoyo, Handoyo; Ronlei, Bernard Cavin; Wibowo, Andy Setyo; Sigalingging, Asido Saputra; Nathania, Edlyn Yoadan; Fatkhan, Fatkhan; Erdi, Aurio; Avseth, Per; Carbonell, Ramon; Nugroho, Pranowo; Bayu Pandito, Riky Hendrawan; Nasibov, Aladin; Ali Husein, Abdullah Ali
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.v48i3.1828

Hydrocarbons have a vital role as a driver of the global economy, which causes demand to continue to increase. To achieve production targets, oil and gas companies try to conduct exploration using efficient and accurate methods to obtain optimal hydrocarbon reserves. One approach in hydrocarbon exploration is to use geostatistical analysis to understand the characteristics of petrophysical parameters of reservoir rocks (e.g. porosity, permeability, water saturation and facies). This study aims to characterize reservoirs in the NE Java Basin using a geostatistical approach that Sequential Gaussian Simulation (SGSIM) to produce random realizations that can be adjusted and validated through geostatistical analysis of data before and after the simulation. The dataset used in this study consist of well data, seismic line, and core data. The results shows the petrophysical properties distribution from the simulation reveals the dominance of carbonate sandstone reservoirs in the central part of the study area with a thinning slope towards the northwest and southeast, while sandstone reservoirs are only dominant in the southeast direction of the study area. This research provides important insights in understanding reservoir characteristics and can be a basis for efficient decision making in the exploration of hydrocarbon resources in this area.

Identification of Shale Layer in Offshore Field of North East Java Basin for Non-Conventional Oil and Gas Exploration Dewanto, Ordas; Syaharani, Nanda Paquita; Darsono, Darsono; Wibowo, Andy Setyo
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 14, No 2 (2024): October
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v14i2.91056

Non-conventional hydrocarbon exploration is one way to develop shale potential to increase oil and gas reserves in Indonesia. Shale is a rock that is rich in organic material and is a target for non-conventional exploration, because it functions as a source and reservoir rock with a large shale volume and low permeability. Isopach maps can represent the thickness of shale layers and have the potential to become non-conventional exploration targets located in thick shale layers. Based on this background, this research will identify shale layers in the offshore fields of the North East Java Basin for non-conventional oil and gas exploration. The methods used are well logging and seismic methods. This research focuses on determining the location of shale layer depocenters based on isopach maps as a first step in localizing areas that will be targeted for the development of non-conventional hydrocarbon exploration. This research uses 29 2D seismic lines and 2 well data, namely NP-1 and NP-2 wells and the research target is the Kujung Formation and Ngimbang Formation in the offshore area of the North East Java Basin. The results obtained from the isopach map show that the depocenter location of the Kujung Formation is in the northwest direction with a shale thickness of 600-800 meters, while the Ngimbang Formation is in the east direction with a shale thickness of 1000-1300 meters. From the depocenter location, it can be seen that this location has a wealth of organic material so it has the potential to become a source rock and reservoir.

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