重力流混合事件层特征及形成演化机制研究—以山东灵山岛地区下白垩统为例

重力流混合事件层特征及形成演化机制研究对完善深水重力流沉积理论和准确预测重力流砂体分布意义重大。本项目以灵山岛地区下白垩统深水重力流沉积露头和对应岩心为研究对象，遵循“现象表征-本质探索-规律总结”的研究思路，采用露头、岩心分析与水槽模拟及数值模拟实验结合的研究方法，以重力流沉积特征多尺度精细表征为基础，明确其物质组成、沉积构造、岩相类型等特征，总结重力流混合事件层类型及典型识别标志；以岩相类型为依据，分析重力流混合事件层发育的垂向和侧向岩相组合类型及分布演化特征，结合岩相组合类型与沉积环境对应关系，阐明不同类型重力流混合事件层形成演化过程，以相似性原理和控制变量对比为原则，开展重力流混合事件层沉积水槽和数值模拟实验研究，探究重力流混合事件层形成演化机制；综合露头、水槽和数值模拟实验约束下的控制因素与混合事件层分布特征相关关系量化解析，以比较沉积学原理为指导，揭示重力流混合事件层分布规律。

Characteristics, formation and evolution mechanism of gravity-flow hybrid event bed is essential to perfecting deep-water gravity-flow theory and forecasting gravity-flow sandstone distribution. Outcrop and core of deep-water gravity-flow deposits in the Lower Cretaceous in Lingshan Island, Shandong Province are taken as research object in this project. Exploiting the idea of “description-interpretation-predication”, outcrop and core analysis combine with flume tank and numerical simulation experiment will be applied in this study. Based on the detail description of deep-water gravity-flow deposits in multiscale, making the composition, sedimentary structures and type of lithofacies clear. Then, the typically diagnoses criteria of hybrid event beds will be summarized. Based on the type of lithofacies, lithofacies association combine with hybrid event beds will be analyzed in both lateral and vertical to understand their distribution and evolution. The relationship between lithofacies association and sedimentary environment will be analyzed to understand the formation and evolution processes of hybrid event bed. Take advantage of similarity principle and control variable comparing, flume tank and numerical simulation experiment will carry out to analysis the formation and evolution mechanism of hybrid event bed. Finally, with the quantitative analysis of relationship between controlling factors and distribution of hybrid event beds on the constrain of outcrop, flume tank and numerical simulation experiment, the distribution patterns of hybrid event beds will be summarized with the guidance of theory of comparative sedimentology.