CHARACTERISTICS OF FAULTS IN THE FUSHAN DEPRESSION OF HAINAN, THE BEIBUWAN BASIN AND THEIR CONTROLLING ROLES TO HYDROCARBON POOL-FORMATION

The tectonic framework and rifting patterns of the Fushan Depressron in Hainan were controlled by basement major faults.There developed deep and shallow two wets of fault systems with different occurrence and active features.The former was advantageous to hydrocarbon screening and pool formation,and the later resulted in the dispersion of oil and gas and the destruction of hydrocarbon pools.In the Fushan Depression of Hainan,faults of two kinds,four genetic types and eight active models were developed,and basement major faults had important controlling roles to the distribution of bydrocarbon source rocks,the formation of traps and the migration and accumulation of oil and gas.Also,reverse fault screening and consequent fault dredging two kinds including six types of pool-forming models for hydrocarbon migration and accumulation were developed.