Tectonic evolution of the kongdian Formation-Sha-IV Member in the Huimin depression and the dongying depression

摘要

The Kongdian Formation and the Sha-IV Member are important oil-gas bearing levels in the Huimin depression and the Dongying depression. The tectonic evolution there can be divided into four stages: the filling stage of extensional semi-grabens corresponding for the Kongdian Formation-Sha-IV Member, the strogn block-activity stage corresponding for the Sha- Ⅱ and Sha-Ⅲ Members, the block-activity complicating stage corresponding for the Sha-1 Member-Dongying Formation, and the deep burying stage corresponding for Neogene and Quaternary.