The Oil And Gas Migration Pathway And Controlling Function Of Reservoir Forming Of Ed₂ And Ed₃ In Liuchu Area Of Jizhong Depression

In order to study the oil and gas migration pathway and controlling function of reservoir forming of Liuchu area in Jizhong Depression,on the basis of the study geometry characteristics,using the method of fault growth index,section stretching rate and tectonic evolution section to determine the activity times of fault,analysis of the formation and evolution history of fault and then divided into fault systems,combined oil accumulation critical period,to determine oil-source fault.According to the method of combining the buried depth isoline and the 3D geological modeling method to identification of dominant migration pathway of oil source fracture.Combined with analysis of hydrocarbon supplying ability of source rock evaluate hydrocarbon migration ability of oil and gas dominant migration pathway in oil-source fault.Through the statistical relationship between different tectonic oil-bearing horizons,sand layers than the average and the relationship between the fracture thickness and the oil and gas distribution,etermination of oil and gas in the lower limit and disconnect shunt than the minimum thickness,so as to determine the oil and gas layer and lateral diversion area.By using the method of filling point description,the oil and gas filling positions are determined.By means of the combination of 3 factors: the lateral filling point of oil source faults,the distribution of different tectonic ridges and channel sand bodies to identify the lateral migration path of oil and gas.Based on the test data of well logging,well logging,and typical reservoir,the types of oil and gas reservoirs and the distribution of oil and water are analyzed.According to the test data of oil testing,well log data,logging data and fine anatomy of typical reservoir.The following main achievements in the research process:?1?Based on the evaluation of the ability of vertical migration pathway of faults in Liuchu area,the fault convex plane ridges of oil source fault are divided into 3 types: the fault convex ridge of connection high effective source rock?class I?,the fault convex ridge of effective source rock?class II?,the fault convex ridge of connection inefficient source rocks?class III?;?2?The lower limit of the fault thickness of the Ed1 and Ed₂ is 272 m in Liuchu area.The net-to-gross ratio of the lateral transporting lower limit is 0.2.Most areas is mudstone caprock sealing oil and gas zone.Only in the central and southern parts of the oil and gas migrated upward to the Dongying or Guantao group.Each layer of sand ratio was higher than the lateral transporting boundaries in Ed₂ and Ed₃.It's the main migration layer of oil and gas;?3?The control of oil and gas migration pathway of Liuchu on hydrocarbon accumulation and distribution is mainly from three points: Location and number of dominant migration pathway of oil source fault is controlling hydrocarbon supply location and quantity;Lateral shunt position controls hydrocarbon migration and accumulation horizon;Lateral migration pathway controls hydrocarbon migration and accumulation of oil and gas distribution region.