吉林大学学报(地球科学版) ›› 2017, Vol. 47 ›› Issue (3): 659-673.doi: 10.13278/j.cnki.jjuese.201703102
朱兆群1, 林承焰1, 张宪国1, 李志鹏2, 谢晶晶3, 魏肃东4, 程平5
Zhu Zhaoqun1, Lin Chengyan1, Zhang Xianguo1, Li Zhipeng2, Xie Jingjing3, Wei Sudong4, Cheng Ping5
摘要: 浅水三角洲作为沉积学和油气勘探领域的热点,目前研究主要集中在大型拗陷型盆地内,对断陷湖盆关注较少。通过充分调研区域地质背景并结合永安地区戴一段的岩心、录井、测井、地震、分析化验等资料进行系统研究后认为,戴一段处于断陷早期,地形较为平缓,水体宽浅且波动频繁,气候温暖湿润,物源供给充足,具备形成浅水三角洲的有利沉积条件。研究区浅水三角洲为近源沉积,以牵引流为主;砂岩中多见强水动力沉积构造;垂向上发育进积、加积的沉积序列,具平行、亚平行及叠瓦状地震反射特征;以前缘亚相为主体,相带宽阔,可分为内、外前缘沉积,水下分流河道构成主要骨架砂体;在向湖推进过程中受沉积物可容纳空间与沉积物补给量比值(A/S)变化的影响较大,不同成因砂体类型及沉积样式呈现有规律的分布。基于以上分析,最终建立了断陷湖盆早期浅水三角洲的沉积模式,在一定程度上对丰富浅水三角洲的沉积学认识并拓展永安地区乃至整个高邮凹陷斜坡带油气勘探的领域和范围具有一定指导意义。
中图分类号:
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