Resolving Facies Architectures of the Fraser River Delta - Past and Present
解析弗雷泽河三角洲的相结构——过去和现在
基本信息
- 批准号:RGPIN-2014-05302
- 负责人:
- 金额:$ 2.19万
- 依托单位:
- 依托单位国家:加拿大
- 项目类别:Discovery Grants Program - Individual
- 财政年份:2014
- 资助国家:加拿大
- 起止时间:2014-01-01 至 2015-12-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Deltas are important depositional environments, both on modern coastlines and in the rock record. In the subsurface, they host significant quantities of water and hydrocarbon resources. Delta systems are complex; they are affected by wave, tidal and river processes, and their architectures are partly controlled by grain size, depositional slope, climate and tectonics. Constraining the range of depositional morphologies that can be expected in deltaic systems is challenging, yet it is necessary in order to predict the morphologies of reservoir bodies in the subsurface and to model fluid flow. Resolving the architecture of modern deltas and the depositional processes that control sedimentation is essential if development and refinement of predictive models are to be achieved for interpreting paleo-deltaic successions. Through this research program a comprehensive sedimentological and ichnological process-response model and a three-dimensional facies architecture of the Fraser River Delta will be developed. The process-response model will provide baseline data on the modern delta for comparison in understanding delta evolution. The 3D architectural model can be used to map fluid flow through permeable sediments, refine estimates of slope failures based on historical data and refine the depositional history of the delta based on facies analysis. The facies model will also act as an analogue for deep-water deltas, particularly those that are tide influenced but also form in high gradient settings. To reach the final goal of a process-response model and a 3D delta architecture, six research projects are defined: 1) sedimentological characterization of the tide-dominated, freshwater Pitt River and Pitt River Delta; 2) quantification of channel migration and sediment accumulation rates in tidal creeks in Mud Bay and development of a depositional model for the bay; 3) characterization of the Boundary Bay sand flats and comparison to the Mud Bay mud flats; 4) determination of the conditions under which mud deposition and muddy bedload transport occurs in the Fraser River; 5) completion of a sedimentological-ichnological model for the entire Fraser River Delta from the landward limit of the tidal backwater to the seaward limit of the prodelta; and 6) construction of a three-dimensional subsurface model of the delta, focused on the recognition of delta subenvironments using geophysical-log data, seismic profiles, and the re-interpretation of core data. A seventh project will also be undertaken to extend subsurface facies mapping of the Fraser River Delta up the Fraser valley and into Washington, USA (i.e., across the Fraser lowlands). Research on Mud Bay, Boundary Bay and the Pitt River will "complete" the dataset already acquired for the delta, and will enable us to model sedimentological and ichnological trends from the landward limit of the tidal backwater to the base of the Strait of Georgia. The complete Fraser dataset will enable us to define criteria for differentiating delta subenvironments in vibracore and on geophysical logs. The models developed for the present delta will be used to construct and refine existing subsurface models, and to map out sedimentary facies. Sedimentary facies constitute the dominant control on fluid flow through the delta, and the 3D architecture of the delta provides a high-resolution framework for mapping fluid flow. Finally, the facies architecture will be extended across the Fraser lowlands to define the extent of sediment deposition from the Fraser River.
三角洲是重要的沉积环境,无论是在现代海岸线上还是在岩石记录中。在地下,它们拥有大量的水和碳氢化合物资源。三角洲系统是复杂的;它们受波浪、潮汐和河流作用的影响,其构型部分受粒度、沉积坡度、气候和构造的控制。限制三角洲体系中可预期的沉积形态的范围是具有挑战性的,但为了预测地下储集体的形态并模拟流体流动,这是必要的。解决现代三角洲的结构和沉积过程,控制沉积是必不可少的,如果要实现解释古三角洲序列的预测模型的发展和完善。通过这项研究计划,将开发一个综合的沉积学和遗迹学过程响应模型和弗雷泽河三角洲的三维相结构。过程响应模型将提供现代三角洲的基线数据,以供比较,了解三角洲的演变。三维结构模型可用于绘制通过可渗透沉积物的流体流动图,根据历史数据改进对边坡破坏的估计,并根据相分析改进三角洲的沉积历史。相模型还将作为深水三角洲的模拟物,特别是那些受潮汐影响但也在高梯度环境中形成的三角洲。为了实现过程-响应模型和三维三角洲结构的最终目标,确定了六个研究项目:1)潮汐主导的淡水皮特河和皮特河三角洲的沉积学特征:2)定量的潮汐小溪在泥湾的通道迁移和沉积物积累速率和海湾沉积模型的发展; 3)边界湾砂滩的特征和与泥湾泥滩的比较:4)确定弗雷泽河中泥沉积和泥质推移质输运发生的条件; 5)完成整个弗雷泽河三角洲从潮汐回水向陆边界到前三角洲向海边界的沉积学-遗迹学模型; 6)三角洲三维地下模型的构建,重点是利用地球物理测井数据、地震剖面和岩心数据的重新解释来识别三角洲亚环境。第七个项目还将进行,以将弗雷泽河三角洲的地下相测绘延伸到弗雷泽河谷,并进入美国华盛顿(即,在Fraser低地)。对泥湾、边界湾和皮特河的研究将“完善”已经获得的三角洲数据集,并将使我们能够模拟从潮汐回水向陆地的界限到格鲁吉亚海峡底部的沉积学和遗迹学趋势。完整的弗雷泽数据集将使我们能够定义标准,区分三角洲亚环境中的vibracore和地球物理测井。为目前三角洲开发的模型将用于构建和完善现有的地下模型,并绘制沉积相。沉积相是控制三角洲流体流动的主要因素,三角洲的三维结构为绘制流体流动图提供了高分辨率的框架。最后,相结构将延伸到整个弗雷泽低地,以确定弗雷泽河沉积物沉积的范围。
项目成果
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{{ truncateString('Dashtgard, Shahin', 18)}}的其他基金
Depositional Cyclicity and Evolution of Convergent-Margin Basins
汇聚边缘盆地的沉积旋回性和演化
- 批准号:
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- 资助金额:
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Depositional Cyclicity and Evolution of Convergent-Margin Basins
汇聚边缘盆地的沉积旋回性和演化
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RGPIN-2019-04528 - 财政年份:2021
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$ 2.19万 - 项目类别:
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Depositional Cyclicity and Evolution of Convergent-Margin Basins
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- 批准号:
RGPIN-2019-04528 - 财政年份:2020
- 资助金额:
$ 2.19万 - 项目类别:
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Depositional Cyclicity and Evolution of Convergent-Margin Basins
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- 批准号:
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$ 2.19万 - 项目类别:
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Resolving Facies Architectures of the Fraser River Delta - Past and Present
解析弗雷泽河三角洲的相结构——过去和现在
- 批准号:
RGPIN-2014-05302 - 财政年份:2018
- 资助金额:
$ 2.19万 - 项目类别:
Discovery Grants Program - Individual
Resolving Facies Architectures of the Fraser River Delta - Past and Present
解析弗雷泽河三角洲的相结构——过去和现在
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Resolving Facies Architectures of the Fraser River Delta - Past and Present
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Resolving Facies Architectures of the Fraser River Delta - Past and Present
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