Faults evolution and its impact on hydrocarbon accumulation in Wuerxun depression
The formation of faults in Wuerxun depression has obvious characters of substage,by analysising the tectonic sequence boundaries,growth index,faults acting rate and stretch,we considered the evolution of the fault had under gone early extension,middle strile-slip and late reversion three stages.By researching the effection of the main faults formed in different periods on hydrocarbon,we have concluded the main faults which controled the depression controled the distribution of hydrocarbon rock;the main controlling faults was the main hydrocarbon migration channel;faults in the direction of SN formed at the end of Yimin group and long-term development oil source faults which in the direction of NNE perpendicular array,forming a lot of traps in Damoguaihe and Yimin group,was one of the main oil enrichment zones.