伸展盆地转换带分析──以松辽盆地北部为例

TRANSFER ZONE ANALYSIS IN EXTENSIONAL BASIN ──A STUDY ON SONGLIAO BASIN

转换带可划分为５种类型：离散型转换带，汇聚型高凸起与低凸起转换带，同向型高凸起与低凸起转换带。其中当伸展量增加时，高凸起转换带可能发展为低凸起转换带。转换带的形成是由于变形地壳物质组成的不均一性或区域张应力场的不均一性，而使伸展断层呈侧列或雁列式发生。松辽盆地发育各种类型转换带，而以同向型高凸起与低凸起转换带最为发育，推测高凸起转换带是盆岭式裂谷系的典型转换带。转换带是油气有利聚集区。

Transfer zones are divided into 5 types in this paper:divergent transfer zone,convergent transfer zones of high relief and low relief,synthetic transfer zones of high relief and low relief.Convergent and synthetic transfer zones of high relief may develop into low relief ones as stretch gets large.The transfer zones were formed because the extensional faults in echelon patterns occurred on earth with inhomogeneous compositions and stress field.There are different types of transfer zones in Songliao Basin,and synthetic transfer zones of high relief and low relief are in rich.We consider that high relief transfer zones are typical ones in basin and range rift.Transfer zones are advantageous domain in accumulation of oil and gas.