乌尔逊—贝尔凹陷构造沉积充填演化对油气成藏的控制作用

CONTROLS OF THE STRUCTRAL SEDIMENTATION,PLACEMENT AND EVOLUTION ON THE OIL AND GAS ACCUMULATION IN WUERXUN-BEIER SAGS

乌尔逊—贝尔凹陷是海拉尔盆地中部断陷带两个主要的二级构造单元,是海拉尔盆地勘探主要领域.从构造演化各个阶段的沉积充填特征分析乌尔逊—贝尔凹陷油气生储盖的配置关系,探讨了构造沉积充填演化对不同构造带油气成藏的控制作用,分析了油气成藏模式及油气富集规律.研究表明：乌尔逊—贝尔凹陷构造演化控制着沉积充填特征,进而控制着生储盖的配置关系;乌尔逊—贝尔凹陷构造沉积充填特征决定了不同构造带具有不同的油藏类型及油气成藏模式,构建了构造沉积耦合控制油气成藏的3种模式,即复式箕状断陷凹中隆起带成藏模式、大型缓坡断阶带成藏模式和深小稳定洼槽型成藏模式。

Wuerxun-Beier Sags are two major secondary structural units of the Central Fault Depression and moreover the main exploratory fields in Hailer Basin.The matching relationship among the source rocks,reservoirs and caps for the hydrocarbon in Wuerxun-Beier Sags are analyzed from the viewpoints of the structural sedimentation,compaction and evolution characteristics,the controlling actions of the above activities on the petroleum accumulation in different structural belts are discussed,and finally the accumulating forms and enriching laws are figured out.The studies show that the features of the sedimentation and compaction in the Sags determine the various types of oil reservoir and hydrocarbon accumulation modes in the different structural belts.In detail,three forms of the accumulation modes are established：the uplift belt form in the duplex dustpan-type fault depression,the fault terrace zone form with a large gentle slope and small-deep stable low form.