Fault Controlling Oil Migration And Accumulation Of Putaohua Oil Reservoir In Aobatao Structure Two Wings

By full using the geological datas such as seismic and logging interpretation datas etc,this paper systematicly analyse the fracture geometrical characteristics,kinematic characteristics in Aobaota structure,combinating the fracture stages,the fault were divided into four sets in study area.Based on the analysis of fracture characteristics,sorted the test data of exploration well,evaluation well and development well,and amended the conclusions of the logging interpretation,summaryed oil and water distribution,controlling factors in vertical and plane,anatomiced typical wells,the reservoir types were divided into five categories 11 small classes,structural-lithologic and fault-lithologic reservoir were mainly reservoir types in two wings.From reservoir,transport,trap,preservation four oil and gas accumulation elements start with the study of fault controlling oil migration and accumulation.The results show that fault control sand effect is not obvious,but underwater distributary channel sandbody of the delta fexo-front can be controlled by long-term contemporaneous faults;Using the results of fault vertical sealing evaluation and the fracture stages,determined oil-migrating fault,analysised hydrocarbon migration mechanism,with typical block described the channel and control of oil-migrating fault;Fault-lithologic traps or lithologic traps that were formed by organic match of oil-migrating fault and sand body,that are favorable place for hydrocarbon accumulation in the area;By dissecting the lateral sealing of faults in Aobaota structure,the result showed that the shale smear was the main mylonitized in this area.Established mathematical relation between SGR which is lateral sealing of fault indicators and hydrocarbon column height,amended the effective trap area of Putaohua reservoirs,which provide a favorable basis for the wells design in blank and spread area.By analogy stratigraphic characteristics and geometrical characteristics of polygonal faults where they developed,we found that there are polygonal fault in Pu351 area in east wing,and they could be the long-term migration pathway of oil.By analysing fracture-controlled mechanism,migration mechanism,migration path and oil-source correlation etc,the oil reservoir-forming patterns are devided into two:Sources within a short distance of lateral movement,border occlusion control model of fault and rock;source within oil and gas filled polygonal fault-screen open,multilateral,of rock boundaries occlusion control model.