| Wangguantun oilfield has a complicated fractured structure.The reservoir of 2nd member of Kongdian Formation（abbreviated as Ek2 below）is deeply buried with less and maldistributional wells than other formations,which causes misunderstandings of the reservoir distribution,and restricts further development of the oilfield.Taking Ek22and Ek24 as research targets,guided by the theories about sedimentology and geology,based on the establishment of high-frequency isochronal framework,using the data of cores,lab experiment,logging,seismic and production performance,adopting the research approach of combining dynamic and static data,though the method of seismic attribute analysis and seismic reservoir inversion etc,this paper carries out research on the distribution of fine reservoir and the control factors of its quality.In this way,this paper sets up the classification standard of high quality reservoir of Ek2 in West Wangguantun Oilfield,and summarizes the distribution law,providing geological basis on the further development.The facies of Ek22 in west Wangguantun Oilfield is subaqueous fan,and Ek24 is braided river delta front.Along the source direction,sandbodies are thicker and more continuously while along the vertical direction sandbodies are mostly lentiform and isolated.The reservoir type is mainly low porosity,low permeability debris arkose with fine granularity,sorting and roundness.The quality is controlled both by sedimentation and diagenesis.Taking the K*h parameter as standard,the reservoir of Ek2 can be devided into 4 typies,and the high quality reservoir is proved to be the 1st and 2nd type,which maily distribut in favorable sedimentary facies like channels and mouth bars. |
