吉林大学学报(地球科学版) ›› 2017, Vol. 47 ›› Issue (4): 1021-1029,1046.doi: 10.13278/j.cnki.jjuese.201704105
赵汉卿, 张建民, 李栓豹, 周连德, 江远鹏
Zhao Hanqing, Zhang Jianmin, Li Shuanbao, Zhou Liande, Jiang Yuanpeng
摘要: 渤海湾盆地A油田新近系明下段Ⅱ—Ⅴ油组是其主力含油层位。通过观察分析岩心资料的沉积构造特征、岩矿特征和粒度特征、测井形态、地球物理属性等特征,综合判定其主要发育曲流河和浅水三角洲两种沉积相类型,油田范围内曲流河主要发育河道、决口扇、天然堤和泛滥平原4种沉积微相,浅水三角洲主要发育水下分支河道、水下天然堤、河口坝和分流间湾4种沉积微相。通过分析沉积相特征,结合高分辨率层序地层学观点,对A油田明下Ⅱ—Ⅴ油组的垂向演化特征进行了探讨,结果表明:处于长周期上升半旋回的Ⅴ油组曲流河呈条带状分布;处于长周期下降半旋回初期的Ⅳ油组浅水三角洲平面呈坨状,内部砂体连通性差;处于长周期下降半旋回中期的Ⅲ油组浅水三角洲平面呈朵叶状,砂体以侧向叠置为主;处于长周期下降半旋回晚期的Ⅱ油组浅水三角洲平面呈鸟足状,砂体以垂向叠置为主。最终提出该油田沉积演化模式。
中图分类号:
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