In hydrocarbon exploration

it is very important to identify the dominant strata for oil and gas lateral charge after vertical migration

but there is few effective evaluation method.This paper took Leave Chu area of the Raoyang Sag in the Bohai Bay Basin as an example.On the basis of comprehensive analysis on factors influencing oil and gas lateral diversion probability

such as caprock thickness and contact area between faults and sand bodies

evaluation methods of influence factors were established by using reservoir seismic inversion.Correlation between percentage of trap-filling and various selected factors was systematically analyzed to build quantitative evaluation equation for fault-sand lateral diversion probability.The results show that when fault-sand lateral diversion factor R>0.3

oil and gas lateral diversion initiates.A positive correlation between the R and percentage of trap-filling is observed.Moreover

when R>0.9

reservoirs are fully charged net pay zone.The factor R is applied to the faults f038 and f008

and the results are in good agreement with drilling data.