【摘要】 <正> 华北盆地系指洛南-肥中、赤峰-开源、郯庐、太行山等四条边界断裂系所包围的区域。是一个由中、新生代断块盆地叠置在中晚元古代—古生代地台盆地之上的大型含油气区。面积约50万平方公里。更多还原

【Abstract】 The formation and evolution of Huabei Basin is discussed in terms ofsedimentary formation and tectonic cycle.Generally speaking,it has experiencedtwo stages of development,i.e.,the stable platform of the Middle-LateProterozoic to Palaeozoic,and the platform activization to block-faulted basinduring Meso-Cenozoic Period.The stage of platform has gone through three evolution periods such as themarginal downwarp of platform in Middle-Late Proterozoic,stable platformbasin in Early Palaeozoic and the alternated marine and nonmarine basinof Late Palaeozoic.The stage of block-faulted basin can be divided into sixevolution periods:(1)the Trassic uplifted platform resulted by the withdrawalof lacustrine basins,(2)the Early to Middle Jurassic fault-downwarped basin,(3)the Late Jurassic-Early Cretaceous fault-fold basin,(4)the Late Cretaceous-Paleocene fault-uplift,(5)the Eocene-Oligocene fault-depressed basin and (6) the Tertiary-Quartery downwarped basin,The basins formed in these evolutionstages bare their own specialities in pattern,framework,sedimentation andformation mechanim.It is stressed by the author that 7 types of major oil generation fault-downwarp basins can be divided in the evolution process in Eocene-Oligocenewithin Huabei Basin.It is specific in southern,central and northern partsrespectively.They have different tectonic cycles,delay of formation and multipleassemblages of oil generation.Finally,the author suggests that the main taskof oil exploration in Huabei Basin in recent years is to extend the explorationextent in Tertiary rocks,to start oil prospecting in Upper Palaeozoic-Mesozoicsystems and to prepare for the exploration in Lower Palaeozoic.更多还原