The Relationship Between Overpressure And Oil Pools Of Funing Formation,in The Northern Slope,Gaoyou Sag,Subei Basin

There is a close relationship between the existence of overpressure and oil gas distribution.By analyzing the formation mechanism of overpressure in the north slope Sha-Hua-Wa area,the main reason is that the pressure of hydrocarbon generation and the dehydration of clay minerals are the main causes of overpressure in this area.Super pressure distribution in the plane by igneous rock influence,only distributed in Shanian slope and HuaWa slope;vertical affected by the nature of the fault,only developed in the Wubao fault block good layer.Through the observation of thin sections and analyses of diagenetic experiments that abnormal overpressure in deep reservoir reached the middle diagenetic stage B.And the ancient fluid inclusions analysis by experiment,clear the abnormal overpressure formation and sandstone second accumulation is closely related.Combined with diagenesis of reservoir pore evolution model of abnormal pressure,In the overpressure zone better reservoir,liquid production capacity,oil and gas shows have rich reservoir forming conditions of reservoir formation and accumulation.By carrying out the overpressure reservoir and reservoir dynamic analysis,Gaoyou depression in slope belt overpressure,quantitative analysis of the reasons for the formation of overpressure,discusses the relationship and distribution characteristics of oil and gas.From a "degree,force,potential and quantity" 12 factors four aspects to carry out the analysis of reservoir dynamic mechanism of overpressure reservoir,that there exists the accumulation and evolution of the north slope of densification accumulation after compacting and forming after compacting two types.Reservoir property and oil-bearing differences between these two kinds of evolution is significant,filling potential index were defined to analyze the evolution process of two kinds of oil and gas filling power and process,then summarizes the overpressure of sandstone reservoirs of oil and gas enrichment rules,and combined with the seismic interpretation and prediction results,it is pointed out that the super the pressure of sandstone favorable reservoir target.