苏北盆地溱潼凹陷殷庄—台兴区块阜宁组三段沉积特征及砂体展布

Depositional characteristics and sand bodies distribution of third member of Funing Formation in Yinzhuang-Taixing Block,Qintong Sag in north Jiangsu

苏北盆地溱潼凹陷殷庄—台兴区块阜宁组三段自上而下分为Ⅰ、Ⅱ、Ⅲ、Ⅳ4个砂组,沉积相组合为三角洲前缘相——包括前缘近端坝、远端坝、分流间湾相砂体夹浅湖—半深湖相泥岩互层。各砂组在分布上具有不同的形态。广山、殷庄、台兴、戴南地区发育的三角洲前缘近端坝和远端坝为有利储集相带。

Four sandstone sets,named Ⅰ、Ⅱ、Ⅲ、Ⅳ from bottom to top,with different spatial distribution,were included in the third member of Funing Formation in Yinzhuang-Taixing Block,Qintong Sag of north Jiangsu.The depositional facies of the Funing Formation were of frontal facies of delta,which were composed of near end bar,distant end bar and underwater distributary channel sandbodies interbedded with meare-lacustrine mud stone.Among these phases,the near end bar and distant end bar of the frontal facies of delta in Guangshan,Yinzhuang,Taixing and Dainan were relatively favorable facies for oil exploration.