断层输导下储集层排驱压力对油气成藏影响作用

Effect of Displacement Pressure to Oil and Gas Reservoir Forming with Fault Transportation

利用油气成藏物理模拟方法,从排驱压力角度研究了断层输导下的油气藏形成过程。研究表明,储集层排驱压力控制与断层侧向配置不同储盖组合的成藏次序,即排驱压力小的储盖组合优先成藏,排驱压力较大的储盖组合次之,这种控制作用与储盖组合的空间相对位置无关;排驱压力影响不同储盖组合的含油或含气饱和度,排驱压力越小,含油或含气饱和度越高,这种影响作用会因储集层空间相对位置的不同而有所差异;断层与储集层的对接与否是储盖组合成藏的先决条件,与断层对接具备成藏的可能性,而未与断层对接则难以成藏。研究结论可用于勘探实践中对断层输导下多套储盖组合试油层位进行评价优选。

Physical simulation method is used to study the process of oil and gas forming with fault trans- portation. The results show that displacement pressure controls the forming sequence of different reser- voirs which are lateral configuration with fault. The reservoir, with lower displacement pressure, is more early to form oil and gas pools than the higher displacement pressure reservoir. This effect has nothing to do with the space position of reservoir. Displacement pressure has important effluence on the oil or gas sat- uration that lower displacement pressure means higher oil saturation. This effect can be changed with the variation of reservoir spatial location. The connectivity of fault and reservoir controls the forming of oil and gas pool. For two reservoirs with same value of displacement pressure, the one connecting with fault can form oil and gas pools, and another not connecting with fault can＇t form oil and gas pool. The research re- sults can be used to evaluate and choose the foremost testing layer forming by fault transportation in explo- ration.