Evolution history of vertical seal of faults and its research significance

Based on the study about vertical seal mechanism and evaluation standard of faults,and according to the analysis of evolution law of vertical seal of faults and the influence factors,a method studying evolution history of vertical seal of faults has been established.The pressure on fault surface equaling to or not to mudstone's plastic deformed limit,is using to determine the formation period of vertical seal of faults.Based on the active history of faults,the evolution history of vertical seal of faults can be studied.Using Surennuoer fault in Wuerxun Depression of Hailaer Basin as an example,the evolution history of vertical seal in the Surennuoer fault in K1d1 caprock has been studied.It is indicated that the vertical seal in the southwest of Surennuoer fault is formed at the end of K1y,after the end of K1y,the vertical seal in the southeast of Surenruoer fault increased gradually up to now.The vertical seal in the northeast of Surennuoer fault is formed at the end of K1d2,but in K1y the vertical seal in the northeast of Surennouer fault began due to fracturing.At the end of K1y,the vertical seal in the northeast of Surennuoer fault began to grow again,and it increase gradually up to now.The formation period of vertical seal of Surennuoer fault in K1d caprock is slightly latter than the period of a great deal hydrocarbon expulsion from K1n1 source rock,and it can seal a great deal hydrocarbon expelled from K1n1 source rock.It's favorable for hydrocarbon accumulation and storage.This may be an important cause that hydrocarbon in this area mainly distributes along Surennuoer fault.