不同时期形成断裂特征及其控藏作用

FAULT CHARACTERISTICS FORMED IN DIFFERENT PERIODS AND THEIR RESERVOIR-CONTROLLING ACTIONS

为了研究含油气盆地断裂的控藏作用,在不同时期形成断裂划分及其特征研究的基础上,对不同时期形成断裂与油气聚散之间关系及对油气成藏的控制作用进行了探讨。结果表明:早期形成断裂为油气成藏提供了遮挡条件,使油气主要聚集在反向早期形成断裂的下盘;长期形成断裂为油气成藏提供了运移输导通道,使油气主要聚集分布在长期形成断裂附近;晚期形成的控藏断裂对已形成的油气藏起到了破坏作用,断裂活动强度越大,对油气藏的破坏程度越大。

In order to study the reservoir-controlling action of the faults in an oil-gas-bearing basin, based on the researches of the fault classification and their characteristics in different forming periods, the relationship between the faults and oil-gas accumulation or dissipation in different forming periods and their controlling actions over the oil-gas accumulation are explored. The results show that： the early formed faults provide the shelter conditions for the oil-gas accumulation, so the accumulation mainly conducted in the lower block of the early formed transoid faults; the long-term formed faults provide the migrating and transporting pathways for the oil-gas accumulation, so the oil-gas mainly accumulated and distributed near the long-term formed faults; the late formed and reservoir-con- trolling faults played the destruction role in the enriched oil-gas reservoirs, the greater the intensity of the fault ac- tivity is, the more serious the damage degree to the oil-gas accumulation will be.