深水碎屑流与浊流混合事件层类型及成因机制

发布时间：2018-01-26 04:33

本文关键词： 碎屑流浊流流体转化过渡流体混合流混合事件层深水重力流成因机制　出处：《地学前缘》2017年03期 　论文类型：期刊论文

【摘要】：同一重力流事件形成的包含碎屑流和浊流及其之间过渡流体的混合流沉积形成的沉积层称为混合事件层。混合事件层主要包含下部砂质碎屑流-上部浊流混合事件层(类型1)和下部浊流-上部泥质碎屑流混合事件层(类型2)以及泥质碎屑流和浊流频繁互层混合事件层(类型3)3种类型。类型1主要为流体转化成因,包含液化作用、沉积物破碎、流体顶部剪切侵蚀、接触面不稳定性和波浪破碎、水力跳跃、流体头部与环境水体混合和多种机制作用下的整体转化7种成因认识。类型2和类型3主要涉及流体转化及流体差异搬运和沉降过程成因,包含碎屑流覆盖浊流、碎屑流内部差异沉降、浊流侵蚀转化、浊流膨胀减速、局部沉积物垮塌和浮力转化6种成因认识。下部砂质碎屑流上部浊流混合事件层和下部浊流上部厚层富含泥质碎屑的泥质碎屑流混合事件层在沉积近端到沉积远端均有分布,多呈条带状或树枝状;下部浊流上部贫泥质碎屑的泥质碎屑流混合事件层主要在沉积远端或基底相对低部位分布,多呈环带状或牛眼状。深水重力流混合事件层的分布主要受泥质含量、颗粒粒度、水体密度等内部因素和重力流成因机制、古地形和构造活动等外部因素综合控制。深水重力流混合事件层的形成及其分布研究对于丰富和完善重力流沉积理论,指导现阶段深水重力流砂体常规和非常规油气勘探及理解自然活动规律、防灾减灾具有重要意义。现阶段对深水重力流混合事件层的多种成因及形成条件和横向分布演化规律的研究还有待进一步深入。
[Abstract]:The sedimentary layer formed by the same gravity flow event consisting of clastic flow and turbidity flow and the mixed flow deposition between them is called mixed event layer. The mixed event layer mainly contains the mixing between the lower sandy clastic flow and the upper turbidity flow. Component layer (. Type 1) and the mixing event layer (type 2) between the lower turbidity flow and the upper muddy clastic flow and the frequent mixing event layer between the muddy clastic flow and the turbidity stream (type 3). Type 1 is the main cause of fluid transformation. Contains liquefaction, sediment breakage, top shear erosion, contact instability and wave breakage, hydraulic jump. There are 7 kinds of causes of the whole transformation under the mixing of the fluid head and the environmental water body and under the action of various mechanisms. Type 2 and type 3 are mainly related to the causes of fluid transformation and fluid differential transport and settlement. Including clastic flow cover turbidity flow, clastic flow internal differential settlement, turbidite erosion transformation, turbidity flow expansion deceleration. Local sediment collapse and buoyancy transformation. Mixed event layer of turbidity flow in the upper part of the lower sand clastic flow and muddy clastic layer in the upper thick layer of the upper part of the lower turbidity stream from the proximal end of the deposit to the distant part of the deposit. The ends were distributed. More banded or dendritic; The mixed event layer of the muddy clastic flow in the upper part of the turbidity current is mainly distributed in the distal part of the deposit or in the lower part of the basement. The distribution of mixed event layer of deep water gravity flow is mainly due to internal factors such as mud content particle size water body density and the formation mechanism of gravity flow. The study on the formation and distribution of mixed event layer of deep water gravity flow is helpful to enrich and perfect the theory of gravity flow deposition. To guide conventional and unconventional oil and gas exploration and understanding of natural activities of deep water gravity quicksand bodies at this stage. It is of great significance to prevent and reduce disaster prevention and mitigation. At present, the study on the formation conditions and lateral distribution and evolution of the mixed event layer of deep water gravity flow needs to be further deepened.
【作者单位】：中国石油大学(华东)地球科学与技术学院;海洋国家实验室海洋矿产资源评价与探测技术功能实验室;
【基金】：国家科技重大专项(2011ZX05009-003) 中央高校基本科研业务费专项资金项目(14CX06070A)
【分类号】：P618.13
【正文快照】： 操应长1,2,杨田1,*,王艳忠1,张少敏1,王思佳1,张青青1,王心怿11.中国石油大学(华东)地球科学与技术学院,山东青岛2665802.海洋国家实验室海洋矿产资源评价与探测技术功能实验室,山东青岛266071CAO Yingchang1,2,YANG Tian1,*,WANG Yanzhong1,ZHANG Shaomin1,WANG Sijia1,ZHANG

【相似文献】