Sabei High Water Cut Period Thick Reservoir Internal Conifguration And Residual Oil Prediction

Sabei Development Zone has entered the high water cut development phase, thelong-term erosion in the reservoir at the bottom of the injected water, inefficient invalid cycleserious cause reservoir internal to the use of large differences in the remaining oil is highlyfragmented. The oil field a large number of core wells statistical results also show that theeffective thickness of the reservoir greater than2metre, almost all see the water, theremaining oil is mainly distributed within the see water layer, which accounted for about30percent the proportion of low unwashed thickness. Heterogeneity within the layer is one ofthe main factors to affect the thick oil layers within the distribution of remaining oil.Sabei Development Zone North Second Western group of core, logging and productionof dynamic analysis data, using the analytic hierarchy process and model fitting method ofcombining compound river channel, single channel in the meandering river sand body, singlepoint bar, and four levels of the point bar lateral accretion model fitting, a systematic analysisof the internal structure of all levels of sub-structure unit to determine the identification of thepoint bar. According to the relationship of the length of the point bar and river bankfull width,and is used to identify the point bar of the study area, determine the size and the occurrence oflateral accretion and lateral accretion layer, and then based on the lateral accretion layermodel, size and occurrence the anatomy of the point bar configuration. The study area Sa twogroups reservoir distributary channel is basically for the high curvature of meandering river,the width of a single meandering generally less than1000metre, the length of the point bar isgenerally less than800metre, generally3~15°inclination of lateral accretion layer. On thisbasis, the conventional three-dimensional geological modeling methods and processes, andapply the fitting of the meandering river point bar lateral accretion automatic mode andembedded modeling approach, the establishment of a three-dimensional reservoir architecturemodel and parameter model were numerical reservoir simulation based on the actualthree-dimensional reservoir architecture model. Inspection wells and new drilling in the studyarea combined with flooding of data interpretation, a clear thick oil layers of distribution ofremaining oil, the meandering river sand body at the bottom of flooding seriously, theremaining oil distribution in the upper body in the sand, is mainly affected by the abandonedchannel the impact of the seepage barrier, laminated patterns of spatial distribution of lateralaccretion, and other, near the shelter in the abandoned channel of the main parts of the lateralaccretion of point bar at the top and the remaining oil is enriched. Targeted Potential measures taken on the basis of the fine described in division of the thick oil layers within the structureinterface and the residual oil, residual oil of the different types of study area aquifer riseslowed to0.46percent natural decline slowed down by3.66percentage points, water floodingfor high water cut stage to provide effective technical support.