Tertiary inversion tectonics and petroleum systems in West Natuna Sea Basins, Indonesia

Nagura, Hiroshi; Honda, Hiromi; Katori, Shusuke

doi:10.3720/japt.65.91

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“…Cullen et al, 2010;Steuer et al, 2014;Kessler and Jong, 2015), and others to be c. 11-10 Ma (e.g. Nagura et al, 2000;Racey, 2011 Sedimentation stopped at c. 17 Ma (Nyalau Unconformity) which represents the second phase of uplift, corresponding to a change of coastline orientation from NW-SE to NE-SW, similar to the present-day, and after that sedimentation resumed with supply from Borneo, mainly from the elevated Kuching-Rajang range (Fig. 17d).…”

Section: Implications For Offshore Unconformitiesmentioning

confidence: 96%

A new upper Paleogene to Neogene stratigraphy for Sarawak and Labuan in northwestern Borneo: Paleogeography of the eastern Sundaland margin

Hennig-Breitfeld

Breitfeld

Hall

et al. 2019

Earth-Science Reviews

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The Miri Zone in Sarawak contains thick Paleogene to Neogene sedimentary successions that extend offshore into the Sarawak Basin (Balingian and Central Luconia Provinces) and Sabah Basin. Exploration offshore has shown the Sarawak Basin in the South China Sea contains major hydrocarbon reservoirs. The sediments on land are age equivalents of the offshore successions and can be used to provide insights into their sedimentological and stratigraphic relations. However, because the rocks are found in mountainous regions covered by dense rainforest much of the stratigraphy in the Miri Zone is poorly known, as are timings and causes of major unconformities in the region that are essential for understanding the tectonic history, basin development, and sedimentary pathways. In this study we integrate fieldwork, U-Pb zircon dating, biostratigraphy, and light and heavy mineral analyses to present a revised stratigraphy for the region as well as paleogeographic maps, including major paleo-river systems for the main sedimentary basins. Rocks studied include parts of the Cretaceous to Eocene deep marine Rajang Group, fluvial to marginal marine sediments of the Oligocene to Early Miocene Tatau, Buan, Nyalau and Setap Shale Formations, and the Miocene sediments which are assigned to the Balingian, Begrih and Liang Formations in the Mukah-Balingian province, and the Belait Formation on Labuan. There is still much debate about the timings or even existence of some important unconformities offshore, such as the Middle Miocene Unconformity (MMU) and Deep Regional Unconformity (DRU). We propose to avoid the ambiguous time-based terminology that has been used for different events by different authors. Instead, our results from the on-land stratigraphy show two main unconformities in northern Sarawak; one at c. 37 Ma (Rajang Unconformity), marking the change from deep marine to fluvial-marginal marine sedimentation, and another one at c. 17 Ma (Nyalau Unconformity) which is related to widespread uplift in Borneo and changing river systems.

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Section: Implications For Offshore Unconformitiesmentioning

confidence: 96%