The Water-drive Characteristic Research Of Fractured-vuggy Carbonate Reservoir

Tehe 4 area oilfield is a strong heterogeneity carbonate reservoir which belongs toa kind of very special carbonate reservoir.There is a complicated geologic conditionand various reservoir spaces showed irregular shape and heterogeneous distribution offracture and cavity, it maked to be a difficult promble in exploring and exploiting. Howto identified fracture and cave, oil-water distribution rule, reservoir behavior charactersand water drive characteristic plays very important roles in making and adjusting ofreservoir development plan.This paper annlysises the drive power of reservior and the volume of water usingthe date of geology, drill core, logging, seismic,combining with the theory of fractureand cave unit.And then, analysises oil-water distribution rule in Tehe 4 area oilfield,Water energy is one of most important naturally energy in the oil displacement process,so there is important significance of estimating accurately the size of the water withrational and efficient exploit the Fractured-Vuggy Carbonate Reservoirs. this paper usethe foreign and domestic development experience on carbonate reservoir and sandstonereservoir and considering the special geological-Physical conditions of thefracture–cavity unit, integrated analyzing the applicability of the approach ofdetermining the size of water bodies, selecting of the method of water-oil volume ratioto estimate the water body size of the fracture-cavity unit.Water flooding curve has been widely applied in China for many years, bothgenerally limited to the sandstone reservoirs in theory and practisely,but the waterflooding law of the carbonate reservoirs are more complex and changeable than that ofthe sandstone reservoirs. Tahe Oilfield is the Ordovician carbonate reservoir,the waterflooding curves have 3 types, single- stage,multi-stage,irregular shape.And themulti-stage shape is the particular curve of carbonate reservoirs, reflecting they are ofdeveloped fractures, instability water energy and complex characteristics of the water flooding law,energy declines spread to different water bodies. Ultiliazation the wellwater analysis of regional and typical wells can verify that there are several water bodyin a fracture cave unit. sums up water drive characteristic of three typical wells,pointsout the influence of geologic condition, concludsthe way of controlled the speed ofwater cut.After comprehensive evaluation of various development techniques in Teheoilfield,this paper maintains that waterflooding, shut-in coning controld and pertinencemeasures of water plugging are very effective ways to increasing the production of oilwell. Making different plan to different fracture and cavity unit characteristic makesvery important sense to guidie the exploitation.