西湖凹陷龙井运动特征

Longjing Movement characteristics in Xihu sag

分析了西湖凹陷龙井运动从开始到鼎盛再到结束的演化过程,研究了龙井运动时期西湖凹陷地层沉积充填特征和分布范围,以及龙井运动形成的褶皱对沉积充填的控制作用。龙井运动具压扭特点,西湖凹陷压扭构造特征表现为二级构造带错开排列、背斜构造雁行排列和断层共轭排列。龙井运动对西湖凹陷油气藏的形成起到了决定性的作用,背斜构造带仍然是西湖凹陷今后勘探的主要目标之一。

A complete evolution process of Longjing Movement, from its initiation, peak to end, is analysed, and several problems are probed, including sediment filling and distribution during Longjing Movement in Xihu sag, and controls of folds caused by the Movement on sediment filling. Longjing Movement is transpressional, and the transpressional structures in Xihu sag are characterized by staggered second-order structure belts, en echelon anticlines and conjugate faults. Longjing Movement may play a determinant role in hydrocarbon accumulation in Xihu sag, and the anticline structure belts will still be main exploration targets in the future.