Integrated Modeling of Karstification of a Central Luconia Field, Sarawak

Kosters, Martha E.; Hague, Paul; Hofmann, Richard A.; Hughes, Brendan

doi:10.2523/iptc-12327-ms

Cited by 5 publications

(1 citation statement)

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“…6A) along with dissolution features (Fig. 7B) that could be related to local tectonic events 40,41 promoting sporadic exposure. It is interesting to note that the sediment accumulation rates (Fig.…”

Section: Late Miocene Shift In Carbonate Deposition Dynamics the Copmentioning

confidence: 99%

The emergence of Miocene reefs in South China Sea and its resilient adaptability under varying eustatic, climatic and oceanographic conditions

Mathew

Makhankova

Menier

et al. 2020

Sci Rep

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During the Miocene, extensive carbonate deposition thrived over wide latitudinal ranges in SoutheastAsia despite perturbations of the global climate and thermohaline circulation that affected the Asian continent. nevertheless, the mechanisms of its emergence, adaptability in siliciclastic-dominated margins and demise, especially in southern South china Sea (ScS), are largely speculative and remains enigmatic along with a scarcity of constraints on paleoclimatic and palaeoceanographic conditions. Here we show, through newly acquired high-resolution geophysical data and accurate stratigraphic records based on strontium isotopic dating, the evolution of these platforms from ~15.5-9.5 Ma is initially tied to tectonics and eustasy, and ultimately, after ~9.5 Ma, to changes in the global climate patterns and consequent palaeoceanographic conditions. our results demonstrate at least two paleodeltas that provided favourable substratum of elevated sand bars, which conditioning the emergence of the buildups that inadvertently mirrored the underlying strata. We show unprecedented evidences for ocean current fluctuations linked to the intensification of the Asian summer monsoon winds resulting in the formation of drifts and moats, which extirpated the platforms through sediment removal and starvation. this work highlights the imperative role of palaeoceanography in creating favourable niches for reefal development that can be applicable to carbonate platforms elsewhere.A gargantuan modification of the planetary climate system and the thermohaline circulation patterns occurred in the Cenozoic with the inflection point being diffused from exceptionally critical tectonic processes that affected Asia 1,2 . At ca. 24 Ma, in close proximity to the Oligocene-Miocene boundary, the continent experienced a transformation of climatic processes from a latitudinal zonal circulation pattern to a monsoon-dominated configuration along with the evanescing of an extensively prevalent subtropical-aridity across Asia and the inception of aridity that was exclusively restricted to the hinterland of eastern Asia 3 . The Asian continent experienced a dynamic climate transition that was instigated by the Paleocene-Eocene collision of the Indian Plate with Asia and the resulting progressive uplift of the Tibetan Plateau (TP). This caused an array of feedbacks that significantly strengthened monsoon-inducing atmospheric circulation with each of its major orogenic pulses 4 (i.e., at (i) ca. and (iii) ca. 15-10 Ma [refer to Fig. 1 for (ii) and (iii)]). Over a span of ~30 Ma, the stepwise exhumation of the TP governed an accelerated amplification of firstly, the Indian Summer Monsoon (ISM) and the Somali Jet with the initial pulse of uplift; secondly, the Southeast Asian Monsoon, the East Asian Summer Monsoon (EASM) and the East Asian Winter Monsoon (EAWM) with 40% uplift of the TP; and lastly, the further intensification of the EASM and EAWM with 80% uplift of the TP 5,6 (Fig. 1). This last uplift

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Section: Late Miocene Shift In Carbonate Deposition Dynamics the Copmentioning

confidence: 99%

The emergence of Miocene reefs in South China Sea and its resilient adaptability under varying eustatic, climatic and oceanographic conditions

Mathew

Makhankova

Menier

et al. 2020

Sci Rep

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Seismic expression of carbonate build-up karstification: karst modelling strategies and insights from synthetic seismic

Fournillon

Fournier

Vidal

2021

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Many ancient carbonate build-ups are impacted by meteoric diagenetic processes including karstification. However, very little is known about the acoustic properties and seismic expression of karstified reservoirs. This paper investigates potential seismic expressions of karstified buildups by means of synthetic seismic modelling. The overall stratigraphic architecture and rock physical properties are derived from published examples of southeast Asian carbonate buildups. Various karst systems, corresponding to distinct stages of karstification of varying intensity, have been superimposed to the background facies-related acoustic model. Three-dimensional synthetic seismic cubes have been computed from the karst-bearing acoustic model and by testing various wavelet frequencies. The proposed approach allowed several types of palaeokarsts to be reproduced, from dendritic karst and flank margin caves to cave networks, in amplitude sections. However, geometrical seismic attributes, like coherency, cannot be accurately reproduced with modelling based on the available literature data. In addition, the exploration of this synthetic seismic shows that non-stratiform diagenetic bodies (i.e leached carbonate wedge in a mixing zone), appears as stratiform even in very high resolution seismic. Thus, their detection and characterisation require advanced techniques or prior knowledge such as borehole data.

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The preservation of water-table caves at depth: Observations from subsurface data and numerical modeling

et al. 2021

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Integrated Modeling of Karstification of a Central Luconia Field, Sarawak

Cited by 5 publications

References 0 publications

The emergence of Miocene reefs in South China Sea and its resilient adaptability under varying eustatic, climatic and oceanographic conditions

The emergence of Miocene reefs in South China Sea and its resilient adaptability under varying eustatic, climatic and oceanographic conditions

Seismic expression of carbonate build-up karstification: karst modelling strategies and insights from synthetic seismic

The preservation of water-table caves at depth: Observations from subsurface data and numerical modeling

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