论文部分内容阅读
滨北地区是目前深层油气勘探的重点区 ,深部油气的形成与基底断裂活动有关 .根据重、磁资料 ,结合部分地震剖面把基底断裂分为三级 .Ⅰ级断裂有 6条 ,属于深大断裂 ;Ⅱ级断裂规模小 ,又称区域性大断裂 ;Ⅲ级断裂规模较小 ,可在地震剖面上反映出来 .基底断裂的展布方向有 4个 ,从老到新依次为北北东向、东西向、北西向、南北向 .滨北地区基底断裂的演化模式有 4种 :(1)东西向的强烈拉张形成北东、北北东向的深大断裂 ;(2 )北东向大断裂的左旋剪切作用形成北东向的Ⅱ级断裂 ;(3)南北向的再次强烈拉张形成近东西向的三条深大断裂 ;(4)东西向断裂的右旋剪切作用形成北西向的Ⅱ级断裂 .即基底构造格局是通过“二张二剪”形成的 .基底断裂控制了滨北地区的侏罗系断陷的分布
The northern part of Binbei is the key area for deep oil and gas exploration, and the formation of deep oil and gas is related to the activity of basement fault.It is divided into three levels according to the gravimetric and magnetic data combined with some seismic profiles.I grade 6 has 6 faults, ; Grade II fractures are small in scale and are also called regional large faults; Grade III fractures are small in size and can be reflected in seismic profiles. There are four distribution directions of basement faults, ranging from north to north in the order from old to new, East-west direction, north-west direction and north-south direction. There are four types of evolutional modes of basement faults in Binbei area: (1) strong tension in the east-west direction forms deep faults in the NE and NE direction; (2) (3) North-north direction once again strongly stretched to form near east-west three deep faults; (4) The east-west fault dextral shear formed northwest direction Ⅱ-level faults, ie, the basement structure is formed by “two second shear”, and the basement faults control the distribution of Jurassic fault in Binbei area