Due to the variation of geologic environment reservoir is often invaded by external water, thus, resulting in the property difference between connate water and formation water.
油藏形成后，由于地质环境变化，储层往往会受到外部水系的侵入，从而造成原生水和水层地层水性质的差异。
2
Between the reservoir system and the external environment the constant material exchange makes the dynamic reservoir system more complex.
油藏系统与外界不断地进行物质交换，造成油藏动态系统更加复杂化。
3
Various natural fractures are the objective reason of leakage in carbonate reservoir, while the tools vibration, stress release and induced fractures are the external reasons of leakage.