The short-term base-level cyclic sequences in the third oil reservoirs of the Yanchang Formation in the Huachi Oil Field, Ordos Basin are examined on the basis of well logs and high-resolution sequence stratigraphy.

• 摘要本文运用高分辨率层序地层学的基准面旋回原理，以钻井、测井资料的综合研究为基础，对华池油田长3油层组进行短期基准面旋回层序分析，将其划分为向上“变深”非对称型、向上“变浅”非对称型与对称型3种基本层序类型和更多的亚类型。