明水绥化地区断裂活动时期及其与油气成藏关系

The Fault Activity Period and Its Relationship to Hydrocarbon Accumulation in Mingshui-suihua Area

为了准确地判断明水绥化地区断裂的主要活动时期及其与油气成藏之间的关系,本文先后利用了构造层序界面反映的构造变形时期、生长指数和断层的垂直活动速率及构造发育史剖面等三种方法对其进行了研究。首先由构造层序界面反映的构造变形时期研究结果可知明水绥化地区断裂主要在火石岭至沙河子组、登娄库组、四方台子组沉积时期活动。其次,根据生长指数和断层的垂直活动速率研究得到,断陷盆地中火石岭至沙河子组沉积时期和登娄库组沉积时期为断裂活动组要时期。最后通过该地区的构造发育史研究可知,断裂的主要活动时期为火石岭组～营城组、登娄库组～嫩江组沉积时期。综合研究认为研究区有利油气聚集带的分析应该位于深层的断陷期和断坳转化期的层位,有利的油气聚集区带分析应以断陷发育地层为主要对象。

In order to precisely judge the main active periods of faults at mingshui-suihua area,and the relationship between faults active periods and hydrocarbon accumulation,this article researches by the methods of structural sequence interface reflecting structural deformation period,generation index and fault＇s vertical active rate,and tectonic development history interface,and so on.Firstly,based on the results of structural sequence interface reflecting structural deformation period,we can known,at mingshui-suihua area,faults mainly act in Huoshiling FmtoShahezi Fm,Denglouku Fm,Sifangtaizi Fm depositing periods.Then,according to the relationship between generation index and fault＇s vertical active rate,the faults＇ main active periods are Huoshiling Fm toShahezi Fm and Denglouku Fm.At last,after studying the tectonic development history at this area,we conclude that the faults＇ main active periods are Huoshiling Fm toYingcheng Fm、 Denglouku Fm toNenjiang Fm.Combining the above analysis,in studying area,favorable hydrocarbon accumulation area is more likely found in fault depression zone and rift depression transformation zone;the analysis of favorable hydrocarbon accumulation area should mainly focus on developing more fault depression zone.