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首页> 外文期刊>Oceanographic Literature Review >Controls on deep-water sand delivery beyond the shelf edge: Accommodation, sediment supply, and deltaic process regime
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Controls on deep-water sand delivery beyond the shelf edge: Accommodation, sediment supply, and deltaic process regime

机译：在搁板边缘超出水深砂输送的控制：住宿，沉积物供应和红细工艺制度

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Stratigraphic models typically predict accumulation of deep-water sands where coeval shelf-edge deltas are developed in reduced-accommodation and/or high-sediment-supply settings. On seismic data, these relationships are commonly investigated on a small number of clinothems, with a limited control on their lateral variability. Advanced full-volume seismic interpretation methods now offer the opportunity to identify high-order (i.e., 4th to 5th) seismic sequences (i.e., clinothems) and to evaluate the controls on shelf-to-basin sediment transfer mechanisms and deep-water sand accumulation at these high-frequency scales. This study focuses on the Lower Barrow Group (LBG), a shelf margin that prograded in the Northern Carnarvon Basin (North West Shelf, Australia) during the Early Cretaceous. Thanks to high-resolution 3D seismic data, 30 clinothems (average time span of ~ 47,000 years) from the D. lobispinosum interval (142.3-140.9 Ma) are used to establish quantitative and statistical relationships between the shelf-margin architecture, paleoshoreline processes, and deep-water system types (i.e., quantitative 3D seismic stratigraphy). The results confirm that low values of rate of accommodation/rate of sediment supply (dA/dS) conditions on the shelf are associated with sediment bypass, whereas high dA/dS conditions are linked to increasing sediment storage on the shelf. However, coastal process regimes at the shelf edge play a more important role in the behavior of deep-water sand delivery. Fluvial-dominated coastlines are typically associated with steep slope gradients and more mature, longer run-out tur-bidite systems. In contrast, wave-dominated shorelines are linked to gentle slope gradients, with limited development of turbidite systems (except rare sheet sands and mass-transport deposits), where longshore drift currents contributed to shelf-margin accretion through the formation of extensive strandplains. In this context, reduced volumes of sand were transported offshore and mud belts were accumulated locally. This study highlights that variations from fluvial- to wave-dominated systems can result in significant lateral changes in shelf-margin architecture (i.e., slope gradient) and impact the coeval development of deep-water systems (i.e., architectural maturity). By integrating advanced tools in seismic interpretation, quantitative 3D seismic stratigraphy represents a novel approach in assessing at high resolution the controls on deep-water sand delivery, and potentially predicting the type and location of reservoirs in deep water based on the shelf-margin architecture and depositional process regime.
机译：地层模型通常预测深水砂的积累，其中群体搁板边缘δ在减少的住宿和/或高沉积物供应环境中开发。在地震数据中，这些关系通常在少数Clinothem上进行研究，对其侧向变异性有限。先进的全卷地震解释方法现在提供了识别高阶（即第4至第5个）地震序列（即Clinothems）的机会，并评估搁板到盆地沉积物转移机制和深水砂积聚的控制在这些高频尺度。本研究重点介绍，较低的BARROW集团（LBG），这是一个在早期的白垩纪北部Carnarvon盆地（西北架子，澳大利亚）北部的货架边缘。由于高分辨率3D地震数据，从D. Lobispinosum间隔（142.3-140.9 mA）的30临床（平均时间跨度）（142.3-140.9 mA）用于建立货架边缘架构，古储藏室工艺之间的定量和统计关系，和深水系统类型（即定量3D地震层层）。结果证实，搁架上的沉积物/沉积物供应量（DA / DS）条件的低值与沉积物旁路相关，而高DA / DS条件与架子上的增加沉积物储存有关。然而，货架边缘的沿海过程制度在深水砂输送行为中发挥了更重要的作用。氟占主导地位的海岸线通常与陡坡梯度和更成熟，更长的延伸的Tur-Bidite系统相关联。相比之下，波浪主导的海岸线与平缓的坡度梯度有关，浊度系统的有限发展（罕见的薄片砂和大气输送沉积物），其中龙头漂流电流通过形成广泛的绞线载体而有助于搁板边缘增生。在这种情况下，减少的沙子在海上运输，泥浆局部积累。本研究突出显示来自氟 - 波导系统的变化，可以导致货架边缘架构（即，坡度梯度）的显着横向变化，并影响深水系统的群体发展（即建筑成熟）。通过整合地震解释中的先进工具，定量3D地震地层地层代表了一种新的方法来评估深水砂输送的控制，以及潜在地预测基于货架 - 保证金建筑的深水储层的类型和位置沉积过程制度。

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  • 来源
    《Oceanographic Literature Review》 |2020年第10期|2150-2150|共1页
  • 作者

    V. Paumard; J. Bourget; T. Payenberg;

  • 作者单位

    Centre for Energy Geoscience School of Earth Sciences University of Western Australia 35 Stirling Highway Perth WA 6009 Australia;

    Centre for Energy Geoscience School of Earth Sciences University of Western Australia 35 Stirling Highway Perth WA 6009 Australia;

    Centre for Energy Geoscience School of Earth Sciences University of Western Australia 35 Stirling Highway Perth WA 6009 Australia;

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