松辽盆地北部深层构造的平衡剖面研究

以平衡剖面理论为指导,利用平衡剖面反演技术,研究了松辽盆地北部深层3条代表性剖面构造的发育史.研究表明,研究区火石岭期初始张裂,沙河子期断陷强烈扩张,营城期断陷向拗陷转化,登娄库—泉头期断陷期后热冷却沉降,青山口—姚家期表现为弱伸展作用.从火石岭期—泉头期的整个深层构造发育期构成了一个完整的伸展盆地演化序列.从油气主运移期与构造形成期的配套关系考虑,古中央隆起带是深层天然气聚集的有利场所.根据松辽盆地深层构造演化史,认为近期的勘探重点应放在以中央古隆起带为核心的深层常规构造油气藏勘探上,同时兼顾非常规天然气的勘探研究.

A study on the balanced sections of the deep structure in north Songliao Basin

Based on the theory of balanced section, the structural histories of three typical deep sections in the studied area are studied by means of the inversion technique of balanced section. It is shown that, in this area, initial fracture produces in Huoshiling period, fault depression intensively extends in Shahezi period, fault depression transforms to depression basin in Yingcheng period, settlement takes place in Denglouku-Quantou period, and there is still weak extension in Qingshankou-Yaojia period. The whole development period of the deep structure from Huoshiling to Quantou is a complete evolution series of an extensional basin. According to the matching relation between main oil/gas migrating period and structure forming period, it is held that the palaeo-central uplift belt is a favorable zone to the accumulation of natural gas; and that the exploration stress in the near future should be put on the oil and gas of deep conventional structure around the palaeo-central uplift belt, and the attention should also be paid to the exploration of unconventional natural gas.