大兴安岭以西含油气盆地的构造迁移

TECTONICAL FLOW OF BASINS IN THE WEST OF DAXINGANLING

大兴安岭以西的含油气盆地具有“两坳夹一隆”的构造格局。以隆为轴线,一组倾向相反成对的阶状断块相向滑移,促使隆起的拾升和沉积中心由隆起向两侧逐步迁移。因此,紧靠隆起的断陷发育早、地层全、规模大、生油能力强。最后探讨了大兴安岭的缓慢隆升对盆地生油和保存条件的影响,指出中央隆起带以西的断陷是最有油气潜力的地区。

Basins of the west Daxinganling have complicated structures frame-works that a central uplift is sandwiched by two downwarps. Supposing the uplift to be an axis, there exists an opposite migration of a group of step fault blocks which have opposite dips, this migration prompted the uprising and the movement of the sedimentary center from the uplift to both sides. Therefore, the grabens near the uplift were formed earlier and have more complete history of development, larger scales, and a better conditions for oil and gas generation than the further ones. At last, we discussed the effect of the slow uprising of Daxinganling upon the basin conditions of oil generation and reservation, then pointed out that the fault grabens west of the uplift is the most promising area.