Distribution Characteristics Of Single Sand Bodyin Minghuazhen Formation Of N38 Blockin Jidong Oilfield

After entering super high water cut Oilfield development period,although the proposed over several kinds of remaining oil distribution patterns of development adjustment measures have some results,it increases the residual oil dispersion and complexity.Then through the understanding of single sand body distribution system,thus further determine the scope of the remaining oil distribution is the key of the system further improve oil recovery.Single sand body,a single connected sedimentary unit,not only is a geological unit which has the genetic relationships of sand body,but also is a seepage unit related with the remaining oil distribution.N38 fault block of Jidong Oilfield,for example,on the meandering river were dissected by grading time,firstly,using core,logging,seismic and dynamic data,on the basis of fine isochronous stratigraphic framework,and further to study the distribution of the single sandbody and the internal spread of point bar,A three dimensional model of single sand body configuration was established,and the effect of the single sand body on the distribution of remaining oil was analyzed.Studies have shown that(1)it has the conclusion that the minimum thickness of a single sand body is 4m,and the maximum thickness of it is 10 m,meanwhile,the minimum of bankfull width is 280 m,and maximum is 1000m;(2)multi-method validation of thickness of lateral accretion bedding in the single sand body is about 0.3-1.08 m,the inclination of lateral accretion bedding is about 8.9 °,the horizontal spacing is about 40 m.(3)Through the comparison between the presence of abandoned channel,shows that the existence of abandoned channel of remaining oil distribution are controlled by water breakthrough direction;Through the change of lithology of lateral accretion,the study shows that calcium lateral accretion layer remaining oil distribute in the structure side lower part intervals,argillaceous lateral accretion layer distribute in the roof and side intervals,physical lateral accretion layer distribute in the structural high position;By means of different permeability contrast,single sand bodies realizing permeability reaches 270 mD,high structurepriority oil-producing.