地质学报2012，Vol.86Issue(6)：867-876,10.
渤海湾盆地莱州湾凹陷新生代盆地演化
Cenozoic Tectonic Evolution of the Laizhouwan Sag in Bohai Bay Basin
摘要
Abstract
The Cenozoic tectonic evolution of the Laizhouwan Sag were systematically analyzed using currently-available seismic and drilling data4 distribution features> tectonic restoration, deposition and subsidence history, and etc. The sequence and tectonic analyses reveal that in the Cenozoic, there were at least two phases of tectonic stress field changes, which played vital role in the formation and evolution of the Layzhouwan Sag. One occurred during Sha3 period (about 40Ma) and the other between Paleogene and Neogene (about 20Ma). The former was coupled with another tectonic event, the Tan-Lu Fault's slip reversal from left lateral to right lateral, and it implies that both of them may have some geodynamical relationship. Analysis of type of the basin indicates that the Laizhouwan Sag is not a typical right-lateral strike-slip pull-apart basin, but a rifted basin controlled mainly by the extensional regime affected by the strike-slip. It is likely that the basin was affected by the left-lateral strike-slip before Sha3 period, and then was reformed into rifted and depression basin under the influence of right-lateral strike-slip. Integrated study shows that evolution of the Laizhouwan Sag in Cenozoic can be divided into four stages: rifted stage (from Kongdian period to Sha3 period ), rifting-depression stage (from Sha 2 period to Dongying period), post-rift depression stage (from Dong 1 period to Guantao period), and neotectonism-related post-rift depression stage (from Minghuazhen period to now).关键词
莱州湾凹陷/构造演化/郯庐断裂/应力场转换Key words
Laizhouwan Sag/ tectonic evolution/ Tan-Lu Fault/ tectonic stress field turning引用本文复制引用
黄雷,王应斌,武强,王强..渤海湾盆地莱州湾凹陷新生代盆地演化[J].地质学报,2012,86(6):867-876,10.基金项目
本文为国家科技重大专项(编号2011ZX05023-006)"近海大中型油气田形成条件与分布"资助的成果. （编号2011ZX05023-006）
