二连盆地石油地质构造特征初探

二连盆地是指地处内蒙古东部中新生代发育而成的一系列断陷-拗陷盆地,面积约10万平方公里(图1).近年来,区内投入了较多地质、地球物理和钻探工作量,特别是在不太长的时间内完成5万多公里地震剖面,为解释盆地的地质构造提供了可靠的资料.本文以该区的地质、地球物理、钻探以及卫星影象等新资料为依据,综合论述了盆地的地质构造特征,并对石油地质条件作了分析,认为盆地具有较广阔的石油勘探前景. 

A PRELIMINARY STUDY ON THE ERLIAN BASIN CHARACTERISTICS FOR STRUCTURAL PETOLEUM GEOLOGICAL

Erlian Basin is a faultdown basin situated in Variscian folded region,in which the thickness of the earth crust is thinner,geothermal gradient is higher,and volcanic activity is frequent.The basin is divided into wide and elongate hosts and narrow and deep grabens.They arranged en echelon and the fills of the basin belong to continental facies,because of their faster depositional rate.The lithofacies and its thickness changed rapidly,but the cycle of depositional sequences is clear.In the basin,the source beds,reservoirs and seals are good,and the conditions of traps are distinctive.Combinations of them are excellent in both space and timing.Consequently,there is a good oil-bearing prospect in the basin.Erlian Basin will be explorated as a new energy base.Therefore,the study on the structural characteristics is important for increasing the reserve of energy and developing petroleum geology knowledge.