松辽盆地北部古中央隆起带深层构造特征及其演化

Deep-seated structural characteristic and evolution of paleo-central uplift belt in northern Songliao basin

为搞清古中央隆起带深层的构造特征及其形成的动力学机制,通过对古中央隆起带深层二维和三维地震剖面的构造解释和构造发育史分析,结合松辽盆地形成的构造背景,对古中央隆起带深层的构造特征及其演化进行了研究,探讨了其演化的动力机制,认为古隆起是在火石岭组地层沉积时期开始发育,在深层构造演化中,古中央隆起带至少经历了2次伸展和2次挤压,登娄库组地层沉积时期基本定型被埋藏保存起来.根据油气运移与构造形成时期的配套关系,认为古中央隆起带是深层天然气聚集的有利场所.

In order to the clarify the deep-seated structural characteristics of paleo-central uplift belt and the dynamic mechanism for its formation, through the structural interpretation of deep-seated seismic profiles for 2-D and 3-D and the study on tectonic development history in paleo-central uplift belt,and in view of the tectonic background of Songliao basin formation,this paper conduct a research into the deep-seated structural characteristics and the evolution of paleo-central uplift belt,and probes into the dynamic mechanism for the evolution of paleo-central uplift belt.As a result,it is deemed that paleo-central uplift began to develop at the time of Huoshiling period,underwent at least two extensions and two compressions in the evolutionary process of deep-seated structure,and finally reached its basic shape during Denglouku period and accordingly was buried and conserved.From the point of view of the matching relation between hydrocarbon migration and the formation period of structure,the paleo-central uplift belt is believed to be a favorable site of deep-seated natural gas accumulation.