松辽盆地白垩系青山口组与泉头组不整合接触关系及其石油地质意义

自本区开展工作以来,多数地质工作者认为,青山口组与泉头组为整合接触,连续过渡.泉头组四段和青山口组为一粒度逐渐变粗的水进序列,是地壳沉降中的统一水进过程. 

THE UNCONFORMITY BETWEEN CRETACEOUS QINGSHANKOU FORMATION AND QUANDOU FORMATION OF SONGLIAO BASIN AND ITS SIGNIFICANCE IN PETROLEUM GEOLOGY

For long time,it is believed that there is a conformity between Cretaceous Qingshankou Formation and Quandou Formation of Songliao Basin with continuous transition.Based on detail analyses of stratigraphic correlation,lithology,and lithofacies,especially with the increasing seismic data to interpret the five seismic profiles across the different structures of the basin,it is proposed there is an unconformity between the two formations resulted from uplifting movements.The T₂ seismic reflection is defined as a contact boundary between the two formations.It is suggested that the unconformity would exert influence on the migration and accumulation of petroleum.So that effort should be made in searching stratigraphic oil/gas pools and related structural traps above or below the unconformity.