利津洼陷北部第三系构造样式及其分布

Structural Styles and Distribution of Tertiary in Northern Lijin Subsag

根据区域地质、地震资料对利津洼陷北部地区的构造样式及其分布进行了研究。研究表明,第三系处于伸展拉张构造背景下的利津洼陷北部地区,发育了许多伸展构造样式,主要包括复合地垒地堑、反向Y字型、多级Y字型构造、X字型构造、垮塌构造、多米诺式断层、顺向倾跷断块构造、逆牵引背斜构造。多米诺式断层及顺向倾跷断块构造样式主要分布在北部陡坡带地区,逆牵引背斜构造、垮塌构造、多级Y字型构造、X型构造、复合地堑地垒构造主要分布在中部凹陷区,反向Y字型构造分布在南部古隆起附近的缓坡带上。研究区地层的隆起活动对该地区7条主要断层的形成起到了控制作用,而7条主要断层又对构造样式的形成起了控制性作用。

Both structural styles and distribution of Tertiary in northern Lijin subsag are studied based on regional geological and seismic data.Results show that (1) the Tertiary is against a background of stretch and extension structures,in which many structural styles are developed,mainly including compound horst and graben,reverse Y-shape,multiple Y-shape and X-shape structures,collapse structure,domino fault,consequently tilting fault block and rollover anticline;(2) domino fault and consequently tilting fault block are dominantly distributed in northern slope belt,central sag belt for the rollover anticline,collapse,multiple Y-shape,X-shape structures,and compound horst and graben,and gentle slope region of around southern paleolift belt for the reverse Y-shape structure,respectively; and (3) not only uplift movement in the study area may control the formation of 7 main faults,but also these faults may control structural styles.