摘要
华北地区中生代沉积盆地以单旋回、中小型为主;在纵向演化上为多期成盆,在平面展布上成群成带;在盆地演化过程中常伴有火山活动;盆地的形成机制、时空组合和建造特征都具有明显的分区性。区内60个沉积盆地或残块可划分为坳陷型、山前坳陷型、褶陷型、断陷型、山间断陷型和断陷-火山岩型等六类原型盆地,分属10个盆地展布区,其中,辽西、石家庄-临清、沈丘、豫西和莱阳等地区的油气远景较好。
Abstract
Mesozoic sedimentary basins in North China are mainly single-cycle ones in small or medium size.The formation of the basins underwent multi-stage evolution accociated with volcanic activities and their distribution appears to be in groups and zones.The north and east part of the region uplifted during the Middle Triassic,lacustrine basins that connected to the Ordos Basin formed only in Late Trias-sic in west Henan and south Shanxi.The whole region uplifted in the latestage of Indosinian movement.In the Early and Middle Jurassic,18 basins which were small in size and contained mainly coal scattered in the mobilebelt around the uplift.In Late Jurassic-Early Cretaceous,the depocentcr movedeastward,and the area of deposition extended and dark sequences were well developed.This was the most prosperous period in the evolution history ofthe Mesozoic basins and the basin number was up to 41.Since Late Creta-ceous,basins were not developed well,and only 14 basins left.The sedimentswere generally red clastic rocks.Till now 60 sedimentary basins or residual blocks have been found withinthe area.They can be divided into 6 kinds of proto type basins,i.e.depres-sion,piedmont depression,fold-depression,fault-depression,intermontanefault-depression and fault-depressed volcanic types.They are distributed in 10 regions,west Liaoning,Shijiazhuang-Linqing,Shenqiu,west Henan and Laiyang among these regions are considered to be oil potential areas.
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