断裂活动时期的垂向开启程度识别方法及其应用

在分析断裂活动时期垂向开启程度及其影响因素的基础上，利用最大主压应力方向与断裂走向之间夹角的大小，建立了一套断裂活动时期垂向开启程度的判别方法，将其应用于海拉尔盆地贝尔凹陷布达特群潜山4条主要源断裂的研究中。结果表明，4条源断裂在同一构造运动时期垂向开启程度略有差异，但不同构造运动时期的变化特征基本一致，其在第3次构造运动时期垂向开启程度低，此时恰好为南屯组烃源岩的大量排烃期，有利于油气在布达特潜山中聚集与保存，这可能是贝尔凹陷在这4条源断裂附近均有工业油流井分布的一个重要原因。

Judging methods for vertical open degree of faults in active period and its application

Based on the analysis of vertical open degree of fault and its influence factors in active period,a method judging vertical open degree of the fault in active period was set up by the angle between the orientation of maximum principal compressive stress and the strike of the fault.The method was applied to study the vertical open degree of four main faults connected with source rocks in buried hill of Budate Group in Beier Depression of Hailaer Basin.Researches show that there were a few differences among vertical open degree of the four faults in the same tectonic movement period,but change characteristics of vertical open degree of the four faults in different tectonic movement period were the same.Vertical open degree of the four faults in the third tectonic movement period was low when a great quantity of hydrocarbon expelled from K1 n source rocks,which was favorable to oil-gas accumulation and preservation in the buried hill of Budate Group.