东营凹陷中央隆起带沙三中洪水重力流浊积水道体系特征

以东营凹陷中央隆起带河155区域沙三中亚段深湖相重力流储层为例，利用岩心、钻井资料、地震数据等，对深湖相高密度洪水浊积水道沉积成因及分布特征进行分析。研究发现，研究区浊积岩中包含较多的碳屑、氧化环境中的泥砾和纹层状红色泥岩层、包卷层理棕红色泥岩等，揭示了高密度洪水事件诱发的深水重力流形成的浊积岩沉积特征。同时岩性上整体以细砂岩-粉砂岩为主，其沉积主体粒度概率曲线具有明显的两段式和三段式特征，且具有底冲刷构造，为明显的深水条件下的洪水诱发型重力流浊积水道特征。通过地震属性及储层分布图研究发现，研究区深水重力流沉积以浊积水道为主，朵页体位于水道末端，且规模较小、发育较差。研究区水道型重力流沉积发育在河125同沉积断层的下降盘，由于构造抬升导致坡度变陡，流体侵蚀能力更强，形成U形或V形侵蚀型水道。砂体沿河125断层滑下后沿沟谷继续向前搬运，受持续性洪水的补给，形成以砂质碎屑流和浊流为主的水道-朵叶体沉积。研究结果对研究区浊积岩的开发及井网调整具有重要的借鉴意义。

Study on the characteristics of gravity flow turbid water channel system in Sha3 middle of the central uplift belt of Dongying Depression

Taking the deep lacustrine gravity flow reservoir in the middle sub member of Es3 in He155 area of the central uplift belt of Dongying depression as an example, the sedimentary genesis and distribution characteristics of deep lacustrine high-density flood turbidite channels are analyzed by using cores, drilling data, seismic data, etc. It is found that the turbidite in the study area contains more carbon debris, mud gravel and laminated red mudstone layer in the oxidizing environment, and wrapped bedding brownish red mudstone, which reveals the sedimentary characteristics of turbidite formed by deep-water gravity flow induced by high-density flood events. At the same time, the lithology is dominated by fine sandstone siltstone as a whole. The particle size probability curve of the main sediment has obvious two-stage and three-stage characteristics, and has a bottom scouring structure, which is an obvious flood induced gravity flow turbid water channel under deep-water conditions. Through the study of seismic attributes and reservoir distribution map, it is found that the deep-water gravity flow deposits in the study area are mainly turbidite channels, and the lobes are located at the end of the channels, with small scale and poor development. The channel type gravity flow deposits in the study area are developed on the descending wall of He125 synsedimentary fault. Due to tectonic uplift, the slope becomes steeper, and the fluid erosion capacity is stronger, forming U-shaped or V-shaped erosion channels. After sliding down along the He125 fault, the sand body continued to move forward along the valley, and was recharged by the continuous flood, forming a channel lobed sediment dominated by sandy debris flow and turbidity flow. The research results can provide important reference for the development of turbidite and well pattern adjustment in the study area.