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The effect of morphology on the overall physical properties of hydrate-bearing sediments

机译：形态对水合物沉积物整体物理性质的影响

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Methane gas hydrates have attracted significant international interest due to their potential as a future energy resource, but also as a geotechnical hazard for offshore operations related to hydrocarbon recovery. In this context, the ability to detect and quantify the presence and concentration of hydrate in submarine sediments and understand the effects it has on host sediments has become increasingly important. Detection and quantification of gas hydrates has been inferred via exploratory seismic surveys, which measure indirectly the bulk dynamic properties of sizeable volumes of sediment in situ. Seismic data are then interpreted using an effective medium model, which employs theoretical assumptions to relate wave velocities to gas hydrate content of the sediment. Wave velocity can then be used to infer hydrate concentration levels. Methane gas hydrates occur in situ in a variety of sediments ranging from coarse-grained sands to fine-grained clays and silts, each hosting a variety of morphologies which occur as two basic types, pore-filling and grain-displacing. There are effective medium models for pore-filling morphologies while there is a lack of modeling techniques that consider grain-displacing morphologies and their effect on the physical properties of gas hydrate-bearing sediments. Thus the effect of hydrate morphology on submarine sediments is poorly understood. A numerical modeling approach, based on computational homogenization that has not been applied as yet for gas hydrate-bearing sediments is presented. The approach considers the multi-scale nature of the material from a geotechnical engineering perspective and has the ability to represent material geometry explicitly. The effect of hydrate on the overall seismic properties of the host sediment is portrayed through simulations of nodular and simple vein morphologies with differing hydrate contents. Results show that morphology has a significant effect on the overall material properties, with the effect being more pronounced on the overall compression wave velocity than on the overall shear wave velocity. The ratio of the two velocities (V_p/V_s) differs depending on the type of morphology and can provide insight into the underlying morphology by assisting in the differentiation between nodular and vein morphologies.
机译：甲烷天然气水合物吸引显著国际兴趣，因为它们作为未来能源资源潜力，同时也为相关的油气回收海上作业土工危险。在这种情况下，检测和量化水合物在海底沉积物中的存在和浓度，并了解它的影响主机沉积物的能力已经变得越来越重要。检测和气体水合物的量化已经经由探索地震勘测，其中测量间接原位沉积物的相当大的体积的体积动态属性被推断。然后地震数据使用有效介质模型，它采用的理论假设为涉及波速在沉积物的气体水合物内容解释。然后波速度可以被用于推断水合物的浓度水平。甲烷气体水合物原位发生在各种沉积物从粗粒到砂细粒度粘土和淤泥，每个举办各种发生作为两种基本类型，孔隙填充和晶粒位移形态的。存在用于孔隙填充形态有效介质模型，而有缺乏建模即考虑晶粒位移形貌及其对含天然气水合物沉积物的物理性质的影响技术。因此水合物形态对海底沉积物的影响知之甚少。尚未对含天然气水合物沉积物中尚未应用为数值建模方法，基于计算均质化呈现。该方法认为，从岩土工程角度来看，材料的多尺度性质，必须明确地表示材料的几何形状的能力。水合物的宿主沉积物的整体抗震性能的效果是通过具有不同水合物内容结节性和简单的静脉形态的模拟描绘。结果表明，形态对整体材料特性的显著效应，其效果是更明显比上对整体剪切波速总压缩波速度。 （V_P / V_S）的不同而不同形态类型的两个速度的比率并且可通过在结节和静脉形态之间的分化辅助提供深入了解底层形态。

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