枣园油田孔一段枣Ⅱ—Ⅲ油组的储集层为一套冲积扇上的河道沉积砂体。在枣Ⅱ和枣Ⅲ上、下两部分中识别出3 个长期基准面旋回、11 个中期旋回, 每个中期旋回由1～5 个短期旋回组成。短期地层基准面旋回分为低可容空间旋回和高可容空间旋回2 种类型, 代表2 种特征不同的河道砂体。中期基准面旋回分为不对称和对称2 种类型。长期旋回内部的高可容空间部位以泥质沉积为主,其间镶嵌一些孤立状河道砂体, 随着基准面上升, 可容空间增大, 砂质含量减少, 砂体宽厚比增加。

Reservoirs of ZaoⅡ and Zao Ⅲ of the first member of Kongdian Formation in Zaoyuan Oilfield are dominated by channel sands developed on alluvial fans. Three long-term base level cycles and 11 middle-term base level cycles are recognized in ZaoⅡ and ZaoⅢ reservoirs, and each middle-term cycle is composed of one to five short-term base level cycles. Short-term cycles can be divided into high and low accommodation space cycles which represent two kinds of channel sand bodies with ifferent characteristics. Middle-term cycles can be classified into symmetry and asymmetry types. Sediments at high accommodation stage of long-term cycle are mainly mud, with single channel inserted in. With the rise of the long-term base level, the ratio of width to thickness of sand bodies increases and sand content decreases.