塔里木盆地多期不整合面的控油前景

塔里木盆地断裂及局部构造不发育,反映了盆地的稳定性与持续沉降的特点,这对生油岩的保存有利,但对油气的输导与聚集则不利。为扩大油气勘探成果,还应重视不整合面对油气的输导与控制作用。在主要的5期不整合面中,削截不整合、多期不整合叠合带及多期地层尖灭密集带、前陆盆地中因沉积作用引起的迁移渐进不整合带,是油气聚集前景的有利区带。

PROSPECT FOR CONTROLLING HYDROCARBON BY MULTISTAGE UNCONFORMITIES IN TARIM BASIN.

Undeveloped faulting and local structures in Tarim basin suggest that it has stability and substained subsiding features, which are favourable for source rock preservation rather than hydrocarbon migration and accumulation in the basin, we should devote more attention to the transporting and controlling effects of unconformities on hydrocarbon to find out additional petroliferous provinces. Among the main five-stage unconformities, these zones, such as truncated zone, multistage unconformity stacked zone, multistage pinch-out concentrated zone and movable progressive unconformable zone that resulted from sedimentation of the foreland basin, are all favourable plays for hydrocarbon accumulation.