Research On Fault Controlling Oil Migration And Accumulation In Sanzhao Depression Putaohua Oil Reservoir The Fault

Based on the analysis of the geometry characteristics of faults in Tll reflective layer , which is top of Qingshankou group, SanZhao Depression in Songliao Basin , this paper systematicly analyse the kinematic characteristics and genetic mechanism of faults, the development characteristics of High-density faults of Tll reflection in southern and northern are of great difference,that is ,in northern part, faults concentrated to band, are nearly north-south strike,mainly caused by Structure.whilefaults in southern part with the typical characteristic of multilateral faults, have multi-strike, intersected to polygon in flat,we hold that it is non-structural-cause faults but because density reversal happened to the shale in Qingshankou Group which is induced by tectonic activity.On the basis of the analysis of the genetic mechanism for faults,Use production data of nearly 5,000 wells ,we systematicly analyse the oil-water distribution of Sanzhao Depression Putaohua reservoir,and the relationship between it and faults,consider that the fault of differert genetic mechanism controls the different oil-water relation in sourthern part and northern part.Faults that controls reservoir in northern can be dividede into three classes,the first class is fault-zone,which controls the distribution of oil ,and the area between fault-zone are usually water.the second class is long-developent fault,which controls the distribution of sand,not extensivey connecting oil fields, oil field are the combination of several independent oil and water systems block ,Each block constitute an independent unit of migration-assemble,as oil supply shortage, coupled with multi-stage activities leading to vertical distribution model of doward water and upward oil.the third class is sub-faults developed in the block,making the relationship between oil and water more complex.sourthern is controled by multilateral faults,oilfield are connected extensively, the release of excess pressure caused frequent activities of fault and vertical migration of oil,so caused the frequent filling of oi It oPutaohua 1 reservoir,the whole well is oil in verticl.