临清坳陷东部新生代盆地变换构造分析及与油气关系

THE ANALYSIS OF CENOZOIC TRANSITION STRUCTURES AND THEIR ELATION WITH PETROLEUM ACCUMULATION IN THE EAST OF LINQING DEPRESSION

伸展背景下的变换构造是指裂谷盆地中为保持区域伸展应变守恒而形成的伸展变形构造的调节体系,包括调节构造与传递构造两类,它在裂谷盆地发展过程中对伸展构造的分段(如东西分带、南北分块)活动起着重要的控制作用。临清坳陷东部新生代盆地的变换构造类型以调节构造为主,传递构造不多见。简述了该区不同时期的变换构造类型和构造样式,并分析了变换构造对沉积环境的控制作用及与油气的关系。对临清坳陷东部新生代变换构造的分析,将对该区的油气勘探具有指导意义。

Transition structure in extended terranes is a coordinated system of deformational features when conserving regional extensional strain.The system includes accommodation structure and transfer structure.Transition structures play an important role in the rift segmentation in the rifting process.Different types and structure styles of the Cenozoic transition structures in the east of Linqing depression are examined.The main types of these transition structures are accommodation structures,and the transfer structures are rare.Such accommodation structures constitute various scale accommodation zones.The secondorder accommodation zones are mainly strikeparallel(parallel to trend of faults or rifts)antithetic anticlinal or synclinal zones,such as Guantao,Guanxian,Tangyi and Shenxian accommodation zones.On the basis of analysis of the control of transition structures on sedimentation and petroleum accumulation,the exploration prospect was assessed in the east of Linqing depression.