内蒙古海拉尔盆地演化研究

STUDYING THE EVOLUTION OF THE HAILAER BASIN,NEIMENGGU

海拉尔盆地的形成和演化可分为断陷和坳陷两个时期。断陷期又可分为5个阶段:孕育阶段、强烈拉张阶段、快速沉降阶段、稳定拉张阶段和萎缩阶段。坳陷期拉张减弱,有扭性作用,盆地变浅。因此,海拉尔盆地为一“断陷-坳陷”转化型盆地。

The Hailaer Basin is a advantageous area to search for hydrocarbons adjacent the Daqing Oil Field. Its formation and evolution can be divided into the two periods: the fault-down period and the warp-down period. The fault-down period can further be divided into five stages: the pregnant stage, the violent extension stage, the rapid sinking stage, the stable extension stage and the withering stage. There was violent volcanic activity with the extension of the basin to form volcanic rock formations in the pregnant stage; uplift with the extension of the basin to form molasse formations in the violent extension stage; rapid sinking with the extension of the basin to form mudstone and shale formations in the rapid sinking stage; strong extension to form sandstone and mudstone formations in the stable extension stage and weak extension to form coal-bearing formations in the withering stage. There were some shear activity with very weak extension durirg the warp-down period. Therefore, the Hailaer Basin is a combination basin from fault-down to warp-down.