Diabase is widespread on the northern slope of the Gaoyou sag.The intrusion of diabase into the oil and gas bearing basin may change the environment of oil and gas formation.

• 苏北盆地高邮凹陷北斜坡辉绿岩普遍发育,辉绿岩侵入到含油气盆地可以改变油气的成藏环境。