海拉尔盆地碎屑岩地层断裂带内部结构及断层封闭性

根据盆地演化规律及断层穿层性,将海拉尔盆地断裂分为盆地基底断裂和盖层断裂;根据活动时期和变形特征,分为早期伸展断裂系统、中期张扭断裂系统、早期伸展)中期张扭断裂系统、中期张扭)晚期反转断裂系统和早期伸展)中期张扭)晚期反转断裂系统.结合海拉尔盆地岩心和野外观察,建立3种断裂带内部结构模式:致密储层中断层角砾岩结构、泥质岩盖层中泥岩涂抹结构和泥质岩盖层内断层泥结构.与油气垂向运移有关的断裂系统包括早期伸展)中期张扭)晚期反转断裂系统(正反转断层)、早期伸展)中期张扭)晚期反转活动的断裂系统(反转再活动正断层)和中期张扭)晚期反转活动的断裂系统.该研究成果可以为海拉尔盆地断层封闭性评价提供指导.

Internal structure of fault zone and fault lateral sealing in clastic rock layer of Hailaer basin

Based on the evolution of basin and the through-going layer of faults,Faults in Hailaer Basin falls into the basin basement fault and basin cover fault.Based on its activity periods and deformation characteristics,the basin cover fault can be divided into six systems,i.e.early extensional fault system,middle transtensional fault system,early extensional-middle transtensional fault system,middle transtensional-late inverted fault system and early extensional-middle transtensional-late inverted fault system.Based on core analysis and field observation in Hailar Basin,three models are established to describe the internal structure of fault zone: fault breccia structure of tight reservoir,the shale smear structure of mudstone caprock,fault gouge structure of mudstone caprock.Fault systems associated with vertical migration of oil and gas include the early extensional-middle transtensional-late inverted fault system(positive inverted faults),the fault system during the early extensional-middle transtensional-late inverted movement(the inverted active normal fault),middle transtensional-late inverted activity fault system.This achievement can provide guidance for lateral sealing evaluate of faults of Hailar basin.