松辽南部大情字井地区断裂构造特征及其控油作用

根据松辽盆地南部大情字井地区的三维地震和钻探资料，分析断裂构造特征及其控油作用。该地区发育北东和北西向两组断裂系统，其中北东向的中央断裂带是具有左行走滑性质的基底主断裂，控制北北西和北西向次级断层发育。中央断裂带以西发育3条北西向浅层断裂带，呈垒堑相间的构造格局；中央断裂带以东浅层断层不发育，为西南倾的平缓斜坡带。断裂是油气运移的重要通道，控制着局部构造圈闭的形成并为岩性圈闭提供侧向遮挡条件。中央断裂带通过控制其两侧断层发育程度和变形样式控制油气分布总体特征：其以西地区以构造及构造一岩性油藏为主，油气分布于3个断垒带；以东地区以岩性油藏为主，大面积含油。图5参11

The fault structure and its controlling role to hydrocarbon accumulation in Daqingzijing area, Southern Songliao Basin

The fault structure and its controlling role to hydrocarbon accumulation in Daqingzijing area are analyzed based on 3-D seismic and drilling data. There are mainly NE strike and NW strike two fault systems in this area. The NE strike central fault was the major basement fault, which had left-lateral strike slip behaviour and controlled the development of NNW strike and NW strike secondary faults. There developed three NW strike secondary faults in the west of central fault with horst-graben interval change pattern, whereas it was a gentle SW dip slope with few faults developed in the east of central fault. The faults were the important migration pathway of oil and gas, and controlled the formation of structural traps and lithologic traps. The central fault controlled the overall hydrocarbon distribution of Daqingzijing area by ways of controlling the faults development level and deformation style of both sides: it was mainly structural and structure-lithologic oil pools which distributed on three faulted horsts on the west side; and formed large-area lithologic oil pools on the east.