黄骅盆地孔西潜山前第三系基底内幕构造解释

INTERPRETATION OF INSIDE STRUCTURES FROM PRETERTIARY BASEMENT IN KONGXI BURIED-HILL,HUANGHUA BASIN

漆家福 杨池银 张俊 王子煜 李建英

Qi Jiafu Yang Chiyin Zhang Jun Wang Ziyu Li Jianying

位于黄骅盆地南部的孔西潜山的前第三系内幕构造十分复杂.通过理论模型分析以及对孔西潜山的地震剖面和探井资料的综合分析后认为,孔西潜山的主体部分是由3～4条向东倾斜的铲式或坡坪式逆冲断层组成的"薄皮"叠瓦扇构造;卷入变形的地层主要是奥陶系、石炭二叠系;逆冲断层在寒武系或更深的地层中收敛合并成为局部的拆离逆冲断层.但是,沿着构造带走向逆冲构造样式有明显变化,孔西潜山南部表现为逆冲三角构造带.从卷入逆冲构造的地层的地质时代推测,逆冲构造主要是在早中三叠世盆地发育之后、侏罗白垩纪盆地形成之前形成的,并在早中侏罗世盆地发育过程中又有进一步活动.局部由于受到中、新生代时期的伸展构造和走滑构造的叠加,构造样式变得更加复杂.

According to the analysis of theoretical model,seismic profile and prospecting well data,the main part of the Kongxi buried-hill consists of 3～4 east-dipping listric or ramp-flat thrust faults appearing as thin-skin imbricate-fan structures.The involved beds include mainly Ordovician and Carboniferous-Permian.The thrusts converged and formed a local detachment thrust in Cambrian or Pre-cambrian.The styles of the chrusts changed along the strike of structural belt.The south part of the buried-hill presented triangle thrust helt.According to the geological date of the involved beds,the thrust structure developed after the development of Early-Middle Triassic basin but before the formation of Jurassic-Cretaceous basin and it continued to thrust during Lower-Middle Jurassic.Local structural styles became more complicated due to the stacking of extensional structures and strike-slip structures of Meso-Cenozoic.

10.11743/ogg20010107