Description Of Reservoir Space About Ordovician Carbonate Reservoir In Tahe Oilfield

Carbonate reservoir exploration and development is difficulty. Because of carbonate’s strong heterogeneity and reservoir space made of pores, cracks and caves, the carbonate reservoir is difficult to prediction and distribution. In this paper, Tahe drilling, core, conventional logging, FMI logging, seismic and other basic data analysis, based on reservoir prediction using seismic and geological modeling technology, the vuggy carbonate reservoir semi-quantitative description.(1)Combined with modern Karst laws and data conditions in the study area,oilfield karsts is divided three karsts belts,like surface karst zone,underground undercurrent zone and deep subsurface flow with the slow flow zone.(2)Oilfield Ordovician carbonate reservoir reservoir is karst,karst caves is the mainstorage space. Venting leakage through the drilling,core,FMI logging,conventionallogging data, identification analysis,the cave type can be divided into 3 types: no-filling,half-filling type and filling type.(3)Based on seismic ants tracking technology ,using 3D seismic data, I predict carbonate fracture and establish large-scale 3D model of fracture revealed cracks in the direction of high permeability with the channel.(4)Statistical analysis of seismic reflection amplitude characteristics of caves,I account that the weak reflection and beaded surface reflection is the stand for cave in seismic data, ueing RMS extraction properties extracted the cave, on this basis I propose the concept aboutc“the cave facies in seismic”; comparison with the actual cave, consistent rate is 66.7%, which the rate of surface karst zone was 100%,the rate of underground undercurrent zone was 75%, the rate of deep subsurface slow flow zone was 0.(5)Based on the data zbout reservoir type of the single well : filling, half-filled and unfilled type for the discrete basis, the RMS attribute constraints, the use of sequentialindicator simulation approach to stochastic simulation. established a filling,semi-filledcave-and three-dimensional distribution of unfilled model type eventually combined with the large-scale crack reappeared S65 unit distribution of karst carbonate chimney 3D model.(6) Based on the model in the cave, according to statistics porosity and oil saturation ofinitial information on the cave reservoir was calculated to establish the porosity, permeability 3D modle.(7) Model of connectivity and production performance are consistent with the conclusions of the high rate of cracks can be connected as the main channel.