中国东部中新生代含油气盆地的反转构造

自西向东,中国中、东部发育有3期反转构造带,即分别形成于侏罗纪-早白垩世末期、晚白垩世-新生代早期和渐新世-中新世末期反转构造带,表明中国中、东部在这3个时期分别经历了3次不同程度的挤压,反转构造的变形幅度由强变弱,构造的保存从差变好.反转构造主要为挤压倾滑型,其次为压扭型.反转构造的发育具有高度的选择性,仅部分先存构造发生了反转,主控因素是砂泥岩组合、断层倾角、断裂带内低摩擦断层泥和异常压力的发育程度等.反转构造的发育期与盆地内主生油期基本一致,因而反转构造为中、东部油气盆地形成大中型油气田提供了有利条件.

Inversion Structure Characteristic of Petroleum Basin in Mesozoic and Cenozoic in Middle and East China

From west to east, there are three inversion structural zones in middle and east China: inversion structural zone developed in the telophase of Jurassic-early Cretaceous, inversion structural zone developed in the telophase of late Cretaceous-early Neozoic and China offshore inversion structural zone developed in the telophase of Oligocene-Miocene. It shows that middle and east China underwent compression in the three phases. The extent of inversion structures ranges from high to low,the preservation ranges from low to high. Major inversion structures are compressional dip-slip style,the second one is compressional torsion style. Fault reactivation during inversion is highly selective, with only a few structures within an extensive set of pre-existing normal faults undergoing compressional reactivation. The mian factors contolling selective inversion are percent of mudstone,size of fault dip,number of low frictional cky in fault zone and degree of abmoral pressure. Time of development of inversion structures is basicly consistent to the that of mian hydrocarbon occurrence in the basins, inversion structures provide favorable condition with occurrence of large and middle fields in the basins in middle and east China.