【摘要】 以现有地质及地震资料为基础,对阿姆河右岸区块东南部靠近吉萨尔山前地区的中下侏罗统主要构造特征进行探讨,一方面有利于促进该区中下侏罗统油气勘探,同时也有利于深化对造山带向盆地过渡的山前地区构造变形规律的认识。研究表明:该区中下侏罗统整体表现为由三列近似呈雁行状排列的NE向背斜带组成的褶皱-冲断构造。从控制背斜构造发育的断裂活动特征看,东部山前断层表现为由南东向北西方向逆冲,活动强度大,向西逆断层运动的强度逐渐减弱,且由南向北西部断层的逆冲运动方向发生反向变化,在研究区的北部发育典型的构造三角带。西部背斜带可视为断裂运动方式由南向北变化导致的调节构造。沿构造带走向,三列背斜构造高点由南向北逐渐升高。通过对中下侏罗统构造变形与上覆地层构造特征的比较,结合该区侏罗系沉积特征,认为中下侏罗统构造变形是与上覆地层构造变形共同形成于新近纪喜山期统一的区域构造运动背景下。其主要构造变形机制是晚古近—新近纪以来,在印度板块、阿拉伯板块和欧亚板块碰撞远程效应影响下,受吉萨尔山脉的隆升挤压和研究区北部NW向的大型断裂如布哈拉断裂、曼格什拉克断裂的右旋压扭共同作用而成。更多还原

【Abstract】 On the bases of existing geological and geophysical data,the main structural feature of the low-middle Jurassic series in the southeast of Amu–Dar’ya right bank area close to Gissar mountain has been researched in this paper,which might promote the exploration of oil and gas in this area and simultaneously might deepen the realization of the structural deformation rule on the front of orogenic zones.The investigation indicates that thrust-fold zones consisting of three en echelon folds stretching from southwest to northeast develop in the low-middle Jurassic series in the southeast of Amu–Dar’ya right bank area near the Gissar mountain.The folds are mainly originated from fault propagation.As far as the activity of controlling faults is concerned,the faults in the east thrust to the west,with strength weakening from east to west.In the west,the direction of faults’ thrust motion turn to opposite from south to north so that the typical triangular structural zone develops in the north area and the west anticline zone might be regarded as a transfer zone arising from the change of faults’ thrust manner from south to north.Along the strike of the structural zone,the anticline structural high rises from south to north,indicating that the faults’ activity strength becomes intense to the north.By comparing the deformation of the low-middle Jurassic series with that of overlying strata,it could be deduced that the deformation of the low-middle Jurassic series associated with that of the overlying formations developed during the Neogene period together.Since late Paleogene to Neogene era,under the influence of the collision between Euroasia plate and the Indian plate along with Arab plate,the dynamical mechanism of the above structural deformation is the compression due to the uplift of Gissar mountain as well as the clockwise compresso-shear stress of the north great faults with NW-SE strike direction,such as Buhara fault and Mangyshlak fault etc..更多还原