The Subei Basin in Jiangsu Oilfield has complex struc- ture.Igneous rocks are distributed widely and lead to later- al velocity variety.

• 江苏油田苏北盆地地下构造复杂,火成岩分布广泛,速度横向变化大,用常规时间偏移资料很难得到准确的地质信息。