【摘要】 依据层长守恒原则对沾化凹陷东北部北东和北西向,各3条连井地震剖面进行了平衡剖面恢复,并分析了各剖面在地质历史时期内伸展率的变化特征,以了解该地区中、新生代盆地发育演化特征。沾化凹陷东北部中、新生代盆地演化可以划分为如下几个主要阶段:早—中三叠世为大型内陆坳陷发育阶段,地层横向沉积稳定;晚三叠世本区整体挤压抬升剥蚀,并开始发育北西向逆冲断层;早—中侏罗世为对前期地势高差起伏填平补齐的均夷化过程,地层沉积具充填-披覆式特征;晚侏罗世—白垩纪原北西向逆冲断层负向反转,转为张性伸展,本区进入断陷盆地发育阶段,局部发育有挤压逆冲构造;古近纪本区仍为断陷盆地发育阶段,除北西向断层继承性活动外,大量北东(东)向正断层开始活动;新近纪本区进入区域性坳陷沉降阶段。更多还原

【Abstract】 To find out the evolutionary characteristics of Mesozoic and Cenozoic basins in northeastern Zhanhua sag,the balancing cross sections of three NW-trending and three NE-trending connecting-well seismic sections were reconstructed, according to the principle that stratum length is conservative.And the variation of extensional proportion in geological periods of each section was analyzed. The basin evolution stages from Mesozoic to Cenozoic in the northeastern Zhanhua sag can be divided into some stages,including the period of early to middle Triassic,a large inland depression developed;in late Triassic the study area was uplifted wholly and denuded,and NW-trending thrusting faults began to develop;during early to middle Jurassic there was a ’filling-up’ process on the undulate topography formed in advance;in the period of Jurassic to Cretaceous former NW-trending faults inversed negatively and transferred to extend,the stage of rift basin began,meanwhile in some areas,stretching and thrusting structures grew;the rift basin continued developing during Paleogene,the NW-trending faults went successive action,and many NE(E)-trending faults also began acting during this stage;in Neogene the study area began to regional subsidence as a depression.更多还原