Abstract:

Studies of regional gravitational field,tectonic evolution, volcanic activities,earthquake and seismic data show that neotectonic movements are active in Bohai Bay basin.The existing Neogene oil and gas pools are mainly distributed in depressions,such as Bozhong,Jiyang and Huanghua,where neotectonic movements are relatively active.The neotectonic movements since Pliocene play a key role in the formation of large Neogene fields,though many other geologic factors make also their contributions.The neotectonic movements would not only improve hydrocarbon accumulation,but would also modify the Paleogene palaeo-pools,leading to the formation of Neogene secondary oil and gas pools through remigration and re accumulation.Comprehensive analysis of seismic and drilling data indicates that the Neogene oil and gas pools in this region are mainly distributed in the reverse drag structures on the footwalls of large inherited active faults.The Bozhong depression and the surrounding fault zones with relatively active neotectonic movements are expected to be favorable areas for exploration of Neogene oil and gas pools.

Key words: Bohai Bay basin, neotectonism, Neogene, petroleum exploration, Bohai Bay basin