A Study On Low Depression Distributition Of Fault Of Controlling Reservoir-formation

K₁q³ and K₁q⁴ of Fuyu reservoir is main oil layers in the north area of Songliao Basin San Zhao depression.Over the years,experts and scholars make lots of research for Fuyu reservoir in Sanzhao depression,the resource situation is low,the resource rate is relatively low,and the evaluation of Fuyu reservoir is also insufficient,which result in the process of drilling successful rate to other area in Daqing oil field is not high in the long-term exploration and development.The main characteristics is the fault features of the area are complexity,the distribution of riversand in Fuyu formation is not obvious,and the coupling relationship between reservoir and fault is not obvious.So the study of Fuyu oil reservoir in this area should start from the fracture,analyze the relationship between the fracture system and the reservoir distribution,and determine the function of the fault controlling reservoir.In this paper,the author base on the seismic,drilling,logging,oil test data and the conclusion of previous studies to study the fault classification,fault development characteristics,reservoir characteristics and the fault controlling reservoir forming in detail,discusses the fault how to control the oil to accumulation;and combine with the data of the fault distribution and fracture characteristics to discuss fault zone and fracture controlling roles to Fuyu reservoir.Sanzhao area fault system of the oil control are discussed,including: controlling oil accumulation fault analysis,T₂ fault migration effect,T₂ fault on the difference of Fuyu oil accumulation effect and fracture with fault zone function for controlling accumulation,to determine the study region main fault controlling reservoir model.The results shows that main source rock fault used for T₂ and T₂-T_1-1 in controlling fault,the are II-III fault and other controlling faults is part of shielding plugging effect to controlling fault;faults are mainly vertical and lateral migration path to the reservoir for vertical migration by depth control and lateral migration by fault distribution;different fracture patterns of Fuyu to reservoirs controlling are different;fault density to oil and gas accumulation are difference for different region;fault density and tight reservoir layer edge fracture are development,and the fault density fracture zone development with high-level accumulation.