Abstract：Hydrocarbon accumulations have a law of the lower-generation and upper-accumulation source-rock-reservoir-caprock pattern.Based on the analysis of influence factors,fault-sand configuration hydrocarbon vertical migration evaluation index (Tc) and fault-sand configuration hydrocarbon lateral migration evaluation index (Td) are obtained.Based on the relation between the ratio of the index Tc to the index Td and hydrocarbon column height,an approach to identify fault-sand hydrocarbon lateral migration is established.This approach is used to the Dongying Formation,Nanpu Sag,and the following understandings are obtained:①For 67 known fault-sand configurations,the minimum Tc/Td is 1.If Tc/Td is greater than 1,it is a lateral migration,if not,vertical migration; ②For 11 unknown fault-sand configurations at Well NP1-5,the Tc/Td of the configurations 1-6 and 8 are greater than 1,so they are lateral migration,which are favorable for hydrocarbon accumulation.The Tc/Td of the configurations 7 and 9-11 are less than 1,they are vertical migration,which are not favorable for hydrocarbon accumulation.The latest drilling proves that the proposed approach is feasible and effective.
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