Abstract:

The lithological oil-gas pools mainly consist of lens shaped sandrock and up-tilted pinching sandrock oil reservoirs in Dongying Sag.The reservoirs show different dynamic characteristics due to the influence of the formation pressure.In normal pressure,the major drive force for oil-gas migration is buoyancy.Oil and gas migrate upward in separate phase along fault,uncomformity and reservoir rock and accumulate in the lithological traps.In abnormal high pressure system,the drive fore is predominantly the formation pressure difference between compaction and uncompaction and that drives oil and gas to migrate and accumulate in the lithological traps.The migrating phase is mainly mixed phase of oil,gas and water or separarte phase.