金湖凹陷三河地区阜二段滩坝砂体识别方法探讨

Discussion on Identification Method for Beach-bar Sand in Fu2 Zone,Sanhe District,Jinhu Depression

苏北盆地金湖凹陷阜宁组二段滩坝砂单砂体数量多、厚度薄(小于6 m),砂泥岩波阻抗特征分异性差,导致滩坝砂体预测难度大,制约了该类型隐蔽油气藏的勘探。针对以上问题,综合运用地震属性、地震相、储层反演及古地形恢复等方法,总结出以古地形定区、微幅构造刻画定圈、敏感地震属性定量的"三定"手段,对研究区滩坝砂体实现有效的预测,该方法对相似地区的薄互层储层预测及隐蔽圈闭的识别具有借鉴意义。

There are a large number of single sand bodies of small thickness （ smaller than 6m ） in beach-bar sand in second zone of Funing formation, Jinhu depression, Subei basin, which has poor differentiation in sand mudstone wave impedance characteristics, resulting in difficulty in beach-bar sand body prediction and limiting the exploration of this type of subtle reservoirs. In order to solve the aforementioned problems, seismic attributes, seismic facies, reservoir inversion and ancient landform recovery are used to summarize ＂three determination＂ method including block determination by ancient landform, trap determination by micro-amplitude structure description and quantity determination by sensitive seismic attribute. The method is then used to achieve effective prediction of beach-bar sand body and provides reference for prediction of thin interbed reservoir and identification of subtle traps in similar districts.