Abstract:

Nanpu depression,located in the north of the Bohai Gulf Basin,is a small Mesozoic Cenozoic superimposed sag with abundent hydrocarbon resources.It is characterized by the geodynamic regime of active rifting with polyphases of extension.During the Indo-Chinese epoch,Nanpu Depression experienced a prerifting and erosion stage with the maxim erosion thickness of 2 km.Since the Early Jurassic,Nanpu Depression has experienced an evolution of four phases of rifting and a period of tectonic reactivation.The four phases of rifting took place in Early Mesozoic,Late Mesozoic,Eocene to Mid-Oligocene and Mid-Oligocene to Miocene respectively.Different stages of tectonic evolution played different roles in the hydrocarbon generation and occurence of the depression.