伊通盆地二号断层与西拉木伦河断裂带及油气的关系

利用重力、航磁、电法和地震资料，结合区域构造地质特征，对伊通盆地二号断层研究认为:二号断层是西拉木伦河断裂带向吉林省东部延伸的一部分。佳木斯-伊通地堑的左旋活动将西拉木伦河断裂带错断，在地堑内保留的西拉木伦河断裂带的一部分作为伊通盆地的基底断层。该断层继承性活动，断层两侧地层发生差异性沉降，逐渐演化为现今的二号断层。作为伊通盆地内一条最重要的同沉积断层，二号断层控制其上下盘地层的沉积和油气成藏。二号断层与其上盘构成陡坡断裂坡折带，控制上盘的沉积物分布；同时断穿基底，沟通下部双阳组和奢岭组的油气源。二号断层早期开启有利于运移油气，晚期盆地反转时封闭，对梁家构造带的油气藏保存起积极作用。

Relationship Between No.2 Fault in Yitong Basin and Xilamulun River Fault and Its Significances for Petroleum

According to regional structural geological characteristics and aeromagnetic,gravity,CEMP and seismic data,the No.2 fault in Yitong graben was part of Xilamulun River fault extending eastwards in Jilin Province.The left-strike faulting of Jiamusi-Yitong graben causes the activities of Xilamulun River fault to form No.2 fault.As the differential subsidence of its hanging wall and footwall,the present configuration of No.2 fault evolves.As an important synsedimentary fault in Yitong graben,No.2 fault controls the hanging wall and footwall deposition and petroleum accumulation.No.2 fault and hanging wall formed a steep fractured slope-break belt,which controls sedimentary distribution of the hanging wall.Incising to basement,No.2 fault connects petroleum source rock of both Shuangyang and Sheling Formation.The formerly opening of No.2 fault is favorable for petroleum migration,and later sealed when the basin reversed.The No.2 fault plays an important role in the process of petroleum accumulation at Liangjia structural area.