冀中坳陷文安斜坡石炭-二叠系构造样式及分布规律研究

Study on Permo-Carboniferous Structural Style and Distribution Pattern in Wenan Slope, Central Hebei Depression

综合应用钻井和测井等基础地质资料,对文安斜坡石炭-二叠系的二维和三维地震剖面进行了精细解释,识别出了研究区内三大类主要构造样式:反转构造、走滑构造和伸展构造。反转构造受先前拉伸作用和地层本身重力的双重影响,新近纪受到近东西向挤压作用,主要发育在大型断裂带主断层下降盘弧形内弯处;走滑构造样式的形成受郯庐断裂变形作用影响和控制,主要分布在文安斜坡的中部;伸展构造样式受古近纪北西-南东向拉伸作用的影响,主要分布在文安斜坡的东部和中部。

After accurate interpretation of Permo-Carboniferous 2D and 3D seismic sections in the Wenan slope, identified 3 main structural styles in study area： inversion, strike-slip and extensional structural styles. The formation of inversion structure comes under double impacts from previous extensional effect and strata gravity, then Neogene near EW compression, and mainly developed in large faulted zone main fault downthrow side curved introvert. The formation of strike-slip structure is impacted and controlled by the Tanlu discordogenic fault deformation effect, mainly distributed in middle part of Wenan slope. The formation of extensional structure is impacted by Paleogene NW-SE extension, mainly distributed in east and middle parts of Wenan slope.