渤海湾盆地南堡凹陷西南庄断层分段特征及演化

以渤海湾盆地南堡凹陷西南庄边界断层为例，应用地震资料，结合构造图和地层厚度图，分析不同地质时期边界断层垂直位移沿走向变化，对边界断层分段生长与演化过程进行了研究，分析了这种过程对沉积的控制作用。西南庄断层在沙三段沉积期可分为东、中、西3个相对独立的断层，它们间呈侧列式分布，在断层段叠覆处发育转换斜坡；沙一段沉积时期，3个断层段连接并出现了统一趋势，同时高柳断层以北的断层段开始废弃。在东营组沉积末期各断层段连接形成统一断层，但仍表现出分段特征，在断层分段处形成横向褶皱，同时高柳断层以北的断层段废弃。横向褶皱和转换斜坡是下盘碎屑物质进入盆地的通道，是有利储层发育区。 

Segmentation characteristics and evolution of Xinanzhuang fault in Nanpu Sag,Bohai Bay Basin

The vertical displacement of boundary faults along strike during different geologic stages was studied using seismic data as well as tectonic and stratigraphic thickness maps for the Xinanzhuang Fault in the Nanpu Sag of the Bohai Bay Basin. The segmentation and evolution of boundary faults were studied and their controls on sediments were analyzed. During the deposition of the third member of Shahejie Formation, the Xinanzhuang Fault was divided into three individual fault segments from east to west, and relay ramps developed where fault segments overlapped. When the first member of Shahejie Formation was deposited, these individual fault segments were linked, and the fault segment to the north of Gaoliu Fault began to be abandoned. At the end of Dongying period, a unified fault was formed, yet still showed segmentation features. Some transverse folds appeared on hanging wall. The fault segment to the north of Gaoliu Fault was abandoned. Coarse sediments migrated into the basin through transverse folds and relay ramps, resulting in favorable reservoir development.