Sedimentary budget of the Northwest Sub-basin, South China Sea: controlling factors and geological implications

Wu, Yanmei; Ding, Weiwei; Clift, Peter D.; Li, Jiabiao; Yin, Shaoru; Fang, Yuefa; Ding, Hanghang

doi:10.1080/00206814.2019.1597392

Cited by 7 publications

(3 citation statements)

References 70 publications

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“…8 Ma, suggestive of the drying trend (Dettman et al, 2001;Singh et al, 2011). This interpretation is consistent with apparent reductions in erosion rates based on records from many Asian marginal seas at that time (Clift, 2006;Wu et al, 2019) as well as records of chemical weathering in the South China Sea Wan et al, 2007). Since the onset of Northern Hemispheric glaciation (NHG) at ca.…”

Section: ■ History Of the Asian Monsoonsupporting

confidence: 80%

Marine sedimentary records of chemical weathering evolution in the western Himalaya since 17 Ma

et al. 2021

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The Indus Fan derives sediment from the western Himalaya and Karakoram. Sediment from International Ocean Discovery Program drill sites in the eastern part of the fan coupled with data from an industrial well near the river mouth allow the weathering history of the region since ca. 16 Ma to be reconstructed. Clay minerals, bulk sediment geochemistry, and magnetic susceptibility were used to constrain degrees of chemical alteration. Diffuse reflectance spectroscopy was used to measure the abundance of moisture-sensitive minerals hematite and goethite. Indus Fan sediment is more weathered than Bengal Fan material, probably reflecting slow transport, despite the drier climate, which slows chemical weathering rates. Some chemical weathering proxies, such as K/Si or kaolinite/(illite + chlorite), show no temporal evolution, but illite crystallinity and the chemical index of alteration do have statistically measurable decreases over long time periods. Using these proxies, we suggest that sediment alteration was moderate and then increased from 13 to 11 Ma, remained high until 9 Ma, and then reduced from that time until 6 Ma in the context of reduced physical erosion during a time of increasing aridity as tracked by hematite/goethite values. The poorly defined reducing trend in weathering intensity is not clearly linked to global cooling and at least partly reflects regional climate change. Since 6 Ma, weathering has been weak but variable since a final reduction in alteration state after 3.5 Ma that correlates with the onset of Northern Hemispheric glaciation. Reduced or stable chemical weathering at a time of falling sedimentation rates is not consistent with models for Cenozoic global climate change that invoke greater Himalayan weathering fluxes drawing down atmospheric CO2 but are in accord with the idea of greater surface reactivity to weathering.

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Section: ■ History Of the Asian Monsoonsupporting

confidence: 80%

Marine sedimentary records of chemical weathering evolution in the western Himalaya since 17 Ma

et al. 2021

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“…(c) Integrated sediment budget for all the basins in the Gulf of Thailand and the northern Sunda Shelf, including the slope sediments documented by Li et al. (2013) and the deep‐water sediments in the south‐western South China Sea from Wu et al (2019). (d) Comparison of the sediment budget for the Gulf of Thailand Sunda Shelf region and the eroded volumes estimated from the regional thermochronology of all potential source areas in Peninsula and mainland Thailand and Indochina that might be supplying sediment into the basins.…”

Section: Discussionmentioning

confidence: 99%

Syn‐ and post‐rift lower crustal flow under the Sunda Shelf, southern Vietnam: A role for climatically modulated erosion

Clift

Wilson

2023

Basin Research

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Tectonic subsidence on rifted, passive continental margins are largely controlled by patterns of extension and the nature of strain partitioning in the lithosphere. The Sunda Shelf, adjacent to the SW South China Sea, is characterized by deep basins linked to regional Cenozoic extension associated with propagating seafloor spreading caused by slab pull from the south. Analysis of seismic reflection profiles and drilled sections crossing the Nam Con Son and Cuu Long basins highlight Oligocene extension, with most of the thinning concentrated in the ductile mid‐lower crust. Upper crustal extension was modest and ductile flow is inferred to be directed northwestwards, towards the oceanic crust. Basin inversion occurred in the Mid Miocene, associated with the collision of the Dangerous Grounds Block and Borneo. Subsequent accelerated tectonic subsidence exceeded predictions from uniform extension models assumed to relate to extensional collapse after inversion. We correlate this to a period of faster erosion onshore driven by strong monsoon rains in Indochina and Peninsular Thailand at that time. Erosion of the onshore basement, inducing rock uplift and coupled with loading of the basins offshore, drives ductile mid‐lower crustal flow, likely to the northeast under Indochina, and/or to the west where Plio‐Pleistocene subsidence of the shelf is very slow. Significant sediment delivery from the Mekong River into the Cuu Long Basin began in the Late Miocene and migrated seawards as the basin filled. Mass balancing suggests that the basins of this part of the Sunda Shelf are filled through erosion of bedrock sources around the Gulf of Thailand. There is no need for sediment delivery from a major river draining the Tibetan Plateau to account for the deposited volumes.

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“…Secondary porosity formed by mineral dissolution in the Paleogene reservoirs of the Pearl River Mouth Basin effectively improves reservoir storage capacity and fluid flow [16,17]. Exploration efforts should focus on potential high-quality reservoirs with developed secondary porosity in the middle and deep reservoirs of the Baiyun Sag [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Diagenetic Evolution and Petrophysical Characteristics of Paleogene Sandstone Reservoirs in the Southwest Baiyun Sag, Northern South China Sea

Zhang,

Fu,

Peng

et al. 2023

Minerals

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In addressing the critical need to understand the geological and diagenetic factors affecting Paleogene sandstone reservoirs in the Baiyun Sag—a region vital for oil and gas exploration—this study delves into the Paleogene Zhuhai and Enping formations. Advanced methodologies, including petrographic thin-section analysis, scanning electron microscopy, wavelet analysis, and carbon and oxygen isotope analysis, were employed to evaluate their petrological characteristics, pore structures, physical properties, and key diagenetic processes. The results indicate that the Zhuhai Formation is primarily composed of feldspathic quartz sandstones with prevalent intergranular dissolution pores, while the Enping Formation consists mainly of feldspathic sandstones with intragranular solution pores. The diagenetic temperatures across both formations ranged from 42.6 to 116.3 °C. The studied reservoirs have experienced porosity alterations due to mechanical compaction (23.07% reduction), carbonate cementation (9.02% reduction), and dissolution (5.09% enhancement). Notably, feldspar dissolution emerged as a significant contributor to high-quality reservoirs, particularly in the upper Enping Formation. These findings offer invaluable insights into the diagenetic evolution of sandstone reservoirs in the Baiyun Sag and hold significant implications for guiding future oil and gas exploration efforts in the region.

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Sedimentary budget of the Northwest Sub-basin, South China Sea: controlling factors and geological implications

Cited by 7 publications

References 70 publications

Marine sedimentary records of chemical weathering evolution in the western Himalaya since 17 Ma

Marine sedimentary records of chemical weathering evolution in the western Himalaya since 17 Ma

Syn‐ and post‐rift lower crustal flow under the Sunda Shelf, southern Vietnam: A role for climatically modulated erosion

Diagenetic Evolution and Petrophysical Characteristics of Paleogene Sandstone Reservoirs in the Southwest Baiyun Sag, Northern South China Sea

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