Distribution Model Of Remaining Oil Of Fractured-Vuggy Carbonate Reservoir In 6-7 Area,Tahe Oilfield

Tahe oilfield 6-7 area is karst fracture-vuggy carbonate reservoir,whose reservoir type is specially complex.The main reservoir is cave,whose development is very irregular.Affected by the multi-period karstification.the reservoir often develops many sets of karst cave system,the recovery rate is significantly lower than other oilfield at home and abroad.Based on the actual development situation in 6-7 area,high quality 3D seismic,rock core,well log data and production data,combined with reservoir engineering,numerical simulation multi-disciplinary approach,a comprehensive study is used in the remaining oil distribution in this process.In order to predict the distribution of remaining oil,it provides the basis to improve ultimate recovery.It's of great significance for the next production deployment and decision making.This thesis combines with research method " from point to surface,micro to macro,static to dynamic,modeling to model" mainly carried out about 7 aspects research work:(1)we extract many seismic attribute bodies compared with single well reservoir types,screening to obtain RMS attribute which is the highest agreement as constraint condition.Combining with the dynamic production data characterizes epi-karst,phreatic zone reservoir characteristics;(2)Based on the calibration in dense section of single well,using the seismic constraint method get the distribution of the dense section of the plane.In the cave system,distribution of dense segment has a strong case for fluid reservoir in block effect;(3)Using the high quality seismic edge detection method,we identify the spatial distribution of key units of large scale channel fracture in 6-7 area,The distribution of fracture mainly in NNW,NNE and EW;(4)Combined with multiple seismic attribute body(RMS,ant-track body,et al)constraint,we established 3D geological model of Sha 67 unit in 6-7 area.And we put forward 3 reservoir combination types:the two holes directly communicated,vug-fracture,fracture-cave;(5)Using the fractured-vuggy system plate model,we simulate the distribution of the remaining oil in 4 production cases.We believe that the landform of the top karst cave,the distribution of dense limestone,the reservoir blind end,the contact position of fault or fracture zone and reservoir has great effect on the distribution of the remaining oil;(6)the controlling factor of the remaining oil distribution could be reduced to 7 kinds of geological factors and 4 kinds of development factors.Top surface form of hammock,the distribution of dense limestone and fracture zone,and geometry types of reservoir control the development of reservoir space and flow channel;Drilling locations,relationship of producing intervals and injection-production affect the sweep region of the water in the reservoir;(7)Through the fine description for the geologic and development factors of remaining oil distribution in fractured-vuggy carbonate reservoir,remaining oil distribution model of hammock,dense barrier occlusion,blind cavity oil,attic,bottom water coning,and pore and fracture around high diversion channel were eventually built up,and the author considered that the remaining oil of control by the compact segment and low monadnock zone will be the focus tapping area in the future.