摘要
固安凹陷是一个北断南超的单断箕状凹陷。早第三纪时期,北部大兴断层强烈活动,南部牛驼镇凸起不断抬升,使凹陷内的地层在沉积时形成自然斜坡,以后,在重力为主导作用下,形成了各种类型的重力滑动构造。这些重力滑动构造沿大兴断层分布的有滚动背斜构造和断阶型构造;沿牛北斜坡分布的有拉张断层和与斜坡倾向相反的伴生断层。这些重力滑动构造一般在油气运移前就已经形成,它们是油气聚集的有利场所。
Guan depression is a half graben-like basin whose north side is faulted and south side overlapped.In early Tertiary,the north Daxing fault grew rapidly,and the south Niutuozhen rise uplifted gradually. These geological factors made slant the newly formed formations in the depression.Then the dominant gravity action caused various gra- vity slumping structures in the depression.There are rollover struc- tures and fault terraces along the Daxing fault,and along the north slope of the Niutuozhen rise there occur tensional,faults and associ- ated faults dipping against the slope.These gravity slumping structures occurred before hydrocarbon migration,so they are favourable places for hydrocarbon accumulation.
出处
《石油地球物理勘探》
EI
CSCD
北大核心
1990年第1期109-117,126,共10页
Oil Geophysical Prospecting
关键词
固安凹陷
重力滑动构造
油气聚集
Guan depression
gravity slumping structure
hydrocarbon accumulation
