反转构造与老君庙油田形成

Inversion Structure and Formation of Laojunmiao Oil Field

近年来，于酒泉盆地中发现５０９反转构造，它位于青西凹陷的东部边界．如果把这个反转构造的形成过程和青西凹陷的下白垩统烃原岩生油过程相联系，并且与老君庙背斜带的形成相联系的话，则发现老君庙油田形成与之关系密切．油田的原油是从５０９断层西侧冲积扇经再次运移而来的．

Inversion structure 509 discovered in recent years, is located on the eastern edge of Qingxi Sag in Jiuquan Basin. It is an inversed fault structure. The fault was formed by two times inversive tectonic reactivation of a growth fault. Correlation of the fault formation to the hydrocarbon generation of Lower Cretaceous sources rock in Qingxi Sag shows that there were two hydrocarbon generating peak, coinciding with the two inversive events in the formation of the fault. Further more, the comparative study of the above mentioned phenomenon and formation of Laojunmiao anticlinal belt indicates that the Laojunmaio Oil Field was formed by hydrocarbon remigration along the fault plane after the hydrocarbon was concentraled in alluvial fan sediments on west side of the fault. So the inversion struture decided the formation of Laojunmiao Oil Field.