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东营凹陷陈官庄地区沙四段下亚段是重要的含油气层段。以前一直认为该层段主要发育冲积扇沉积,近年来逐渐发现该看法与勘探开发现状不相符合。针对储层变化大、油气产量高低差别大和油水关系复杂等生产实际问题,通过详细的岩心观察,以及沉积物的颜色和沉积物结构特征等研究,认为该层段红色泥岩中呈夹层状出现的灰色砂岩属于滩坝成因。滩坝的形成是早期沉积的冲积扇扇端亚相沉积物在沿岸流和波浪的持续性作用或颠选改造下,沿着湖泊边缘沿岸流的方向发生二次搬运和沉积的结果。认识的改变有助于勘探思路的调整,下一步应该沿岸流方向向西寻找新的勘探阵地。
The lower segment of Es4 in the Chenguanzhuang area of Dongying Depression is an important oil-bearing reservoir segment. In the past, it was thought that alluvial fan was mainly developed in this interval, and in recent years, it gradually finds that this view does not accord with the status of exploration and development. According to the actual production problems such as large reservoir variation, large difference in oil and gas production volume and complex relationship between oil and water, through detailed core observation, sediment color and sedimentary structural characteristics, it is considered that the red mudstone in this interval appears as a sandwich Gray sandstone belongs to the cause of beach dam. The formation of beach dams is the result of the secondary transport and sedimentation of the early sedimentary alluvial fan facies subfacies sediments along the coastal stream along the edge of the lake under the persistent effect of the coastal currents and waves or the transversion. Changes in understanding are helpful for the adjustment of exploration ideas, and the next step should be to search for new exploration sites westward along the direction of the shore flow.