Log Interpretation And Quantitative Evaluation Of The Kexia Group Water-flooded Layer In East District 7-1,karamay Oilfield

As a typical conglomerate reservoir,the Kexia Group formation in east district 7-1,Karamay Oilfield is characterized by complex lithology,variable physical properties and strong heterogeneity because of the special depositional environment and geological structure background,which brings great difficulties to oil field exploitation.After the development of more than half a century,the reservoir has now entered the expansion phase of polymer flooding,The original log interpretation models and quantitative evaluation technology of water-flooded layer have been unable to meet the actual needs of production and must be rebuilt.In this dissertation,on the basis of lithological classification,we study contrastively core description data and logging curve material,finally we establish sub-regional lithology identification charts and recognition rules.According to core analysis data and well logging data,we reveal the relation between features of logging response and reservoir evaluation parameters such as porosity,permeability and shale content,then obtain the formula for calculating each parameter by the method of linear regression,finally we establish fine log interpretation models based on sub-regional and lithological classification.Aiming at solving the problem in evaluating quantitatively water-flooded layer in conglomerate reservoir,we select three characteristic parameters such as oil saturation,water production rate and mining index to divide water-flooded level,finally establish an evaluation criterion and recognition rules.According to above results,we develop a set of programs to interpret water-flooded layer and process 183 production wells,obtaining a satisfying result with coincidence 87%,which has a directive function to evaluate conglomerate reservoirs of other districts in Karamay Oilfield.