The Fault In The West Of Daqing Placanticle South Two And Three Districts Detailed Interpretation And Its Effect On Residual Oil Distribution

The position in the study area is located in sal figure anticline structure highs--South,west three areas is the most complex structure on daqing changyuan block,in the north east to the development of fault is real,but the cause of the fault current is not clear,lead to faults intersection relationship,combination relationship and understanding unclear pattern,directly affect the correct understanding of fault.At the same time,the combination rate of small fault breakpoints in the research area is low,which obviously affects the development of injection-mining relations.Therefore,based on structural knowledge describe,it is necessary to construct complex area of remaining oil distribution study,micro structure,and on the basis of fault complex fault block area oil field development adjustment.Daqing changyuan south,three areas,the fault development and mutual intersection and combination patterns are very complex,the entire Sa Na oilfield area of 3 d seismic development has achieved completely covered.But if just rely on seismic data to describe the development of all sorts of small faults obviously is hard to do,so for small fault,its distribution law still needs further research,is still uncertain.Such uncertainty will directly affect all kinds of development and injection and mining work led by residual oil.On the basis of predecessors' explanation,we take advantage of existing geological data,the cause of the mechanism of fracture in the studied area,the kinematics and geometry characteristics was studied fully,to all kinds of fracture growth pattern in the studied area and developmental characteristics were determined.The section position was determined vertically,the section interpretation model of the typical block was determined,and the fault was explained in detail in combination with the fracture configuration and structural genesis in the study area.The fault plane combination model of saltu,grapevine and high platform oil layer was analyzed and determined,and the rationality of NNW fault interpretation was determined.The combination of some breakpoints in the study area was recalibrated in combination with the fault vertical combination model.Finally,the influence of the fault on the residual oil distribution is analyzed based on the fine interpretation of the fault.Complex cross fault blocks are formed in multiple directions of fault plane.NNW trending fault is a synsedimentary fault,with multiple stages of active succession development.NEE trending fault is an anisogenic fault,which is formed in the late inversion period and controlled by the late extrusion and longitudinal flexural fold.Three evaluation methods of combined breakpoints are established :(1)fault vertical section growth theory guides the effective combination of "one well multi-break" breakpoints;(2)quantitative prediction of scattered breakpoints at the end of subseismic fault by "displacement gradient method";(3)well-seismic small fault fine interpretation combination scattered breakpoints.The residual oil accumulation area at the edge of a single fault is the positive micro-amplitude tectonic area of the lower disk of the reverse fault,and the area with imperfect injection and mining and uncontrollable well network.