Basin Study in Atambua, West Timor, Indonesia from Gravity Data
Timor Island, Indonesia has complex geological structures related to its tectonic history. There is an existing subsurface geological model that is based on geophysical data. It is limited to the regional crustal scale and has a relatively low spatial resolution. The objective of our study was to d...
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| Format: | Article |
| Language: | English |
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ITB Journal Publisher
2022-09-01
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| Series: | Journal of Mathematical and Fundamental Sciences |
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| Online Access: | https://journals.itb.ac.id/index.php/jmfs/article/view/17701 |
| _version_ | 1811279891018022912 |
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| author | Edy Wijanarko Ilham Arisbaya Prihadi Sumintadireja Warsa Warsa Hendra Grandis |
| author_facet | Edy Wijanarko Ilham Arisbaya Prihadi Sumintadireja Warsa Warsa Hendra Grandis |
| author_sort | Edy Wijanarko |
| collection | DOAJ |
| description |
Timor Island, Indonesia has complex geological structures related to its tectonic history. There is an existing subsurface geological model that is based on geophysical data. It is limited to the regional crustal scale and has a relatively low spatial resolution. The objective of our study was to delineate the sedimentary basin configuration of the area, both laterally and vertically, based on gravity data. Spectral analysis of the Bouguer anomaly allowed for anomaly enhancement by wavenumber domain filtering. Two main basins were identified from elongated low gravity anomalies that follow a SW-NE trend, i.e., the Central Basin and the Atambua Basin. The 2½D gravity modeling of selected profiles perpendicular to the regional structural direction revealed the sedimentary fills of the basins and the basement based on their densities. The Bobonaro mélanges and Viqueque sequences dominate and overlay the syn-rift (Kekneno sequences) and post-rift (Kolbano sequences) with varying lithology. These para-autochthon sediments are dominated by shale and carbonaceous rocks. Their respective thicknesses and depths of burial imply the possibility of hydrocarbon generation. The underlying basement may be associated with the Australian crust protruding from the south.
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| first_indexed | 2024-04-13T01:03:58Z |
| format | Article |
| id | doaj.art-173fd16b44f64c509d7f257559e74da4 |
| institution | Directory Open Access Journal |
| issn | 2337-5760 2338-5510 |
| language | English |
| last_indexed | 2024-04-13T01:03:58Z |
| publishDate | 2022-09-01 |
| publisher | ITB Journal Publisher |
| record_format | Article |
| series | Journal of Mathematical and Fundamental Sciences |
| spelling | doaj.art-173fd16b44f64c509d7f257559e74da42022-12-22T03:09:23ZengITB Journal PublisherJournal of Mathematical and Fundamental Sciences2337-57602338-55102022-09-0154110.5614/j.math.fund.sci.2022.54.1.8Basin Study in Atambua, West Timor, Indonesia from Gravity DataEdy Wijanarko0Ilham Arisbaya1Prihadi Sumintadireja2Warsa Warsa3Hendra Grandis4Centre for Oil and Gas Technology LEMIGAS Jalan Ciledug Raya Kav. 109 Jakarta Selatan 12230, Indonesia1Centre for Oil and Gas Technology LEMIGAS Jalan Ciledug Raya Kav. 109 Jakarta Selatan 12230, IndonesiaFaculty of Earth Science and Technology, Institut Teknologi Bandung (ITB) Jalan Ganesha 10 Bandung 40132, IndonesiaFaculty of Mining and Petroleum Engineering, Institut Teknologi Bandung (ITB) Jalan Ganesha 10 Bandung 40132, Indonesia Faculty of Mining and Petroleum Engineering, Institut Teknologi Bandung (ITB) Jalan Ganesha 10 Bandung 40132, Indonesia Timor Island, Indonesia has complex geological structures related to its tectonic history. There is an existing subsurface geological model that is based on geophysical data. It is limited to the regional crustal scale and has a relatively low spatial resolution. The objective of our study was to delineate the sedimentary basin configuration of the area, both laterally and vertically, based on gravity data. Spectral analysis of the Bouguer anomaly allowed for anomaly enhancement by wavenumber domain filtering. Two main basins were identified from elongated low gravity anomalies that follow a SW-NE trend, i.e., the Central Basin and the Atambua Basin. The 2½D gravity modeling of selected profiles perpendicular to the regional structural direction revealed the sedimentary fills of the basins and the basement based on their densities. The Bobonaro mélanges and Viqueque sequences dominate and overlay the syn-rift (Kekneno sequences) and post-rift (Kolbano sequences) with varying lithology. These para-autochthon sediments are dominated by shale and carbonaceous rocks. Their respective thicknesses and depths of burial imply the possibility of hydrocarbon generation. The underlying basement may be associated with the Australian crust protruding from the south. https://journals.itb.ac.id/index.php/jmfs/article/view/177012.5D modellingAtambuabasementbasingravityTimor Island |
| spellingShingle | Edy Wijanarko Ilham Arisbaya Prihadi Sumintadireja Warsa Warsa Hendra Grandis Basin Study in Atambua, West Timor, Indonesia from Gravity Data Journal of Mathematical and Fundamental Sciences 2.5D modelling Atambua basement basin gravity Timor Island |
| title | Basin Study in Atambua, West Timor, Indonesia from Gravity Data |
| title_full | Basin Study in Atambua, West Timor, Indonesia from Gravity Data |
| title_fullStr | Basin Study in Atambua, West Timor, Indonesia from Gravity Data |
| title_full_unstemmed | Basin Study in Atambua, West Timor, Indonesia from Gravity Data |
| title_short | Basin Study in Atambua, West Timor, Indonesia from Gravity Data |
| title_sort | basin study in atambua west timor indonesia from gravity data |
| topic | 2.5D modelling Atambua basement basin gravity Timor Island |
| url | https://journals.itb.ac.id/index.php/jmfs/article/view/17701 |
| work_keys_str_mv | AT edywijanarko basinstudyinatambuawesttimorindonesiafromgravitydata AT ilhamarisbaya basinstudyinatambuawesttimorindonesiafromgravitydata AT prihadisumintadireja basinstudyinatambuawesttimorindonesiafromgravitydata AT warsawarsa basinstudyinatambuawesttimorindonesiafromgravitydata AT hendragrandis basinstudyinatambuawesttimorindonesiafromgravitydata |