The Study On Logging Evaluation Method Of Freshwater Flooded Layer In T Oilfield In Xinjiang

Xinjiang T oilfield has entered the high water-cut stage in the middle and later stages of waterflood development,the reservoirs are complex and changeable,the injection and production pattern is not perfect,the remaining oil is unevenly distributed,and it is difficult to evaluate the flooded layer by logging,and there is a lack of a more unified interpretation model and standard for flooded layers.Therefore,it is necessary to conduct comprehensive evaluation techniques for water flooding layers,complement and improve interpretation methods and interpretation standards for water-flooded formations,so that interpretation parameters and treatment results tend to be reasonable and stable,improve interpretation accuracy and the overall level of logging interpretation in flooded layers.Based on well log and core analysis data,the core analysis and test data were comprehensively used to study the characteristics of reservoir rock in the flooded section,such as basic rock properties,type and content of clay minerals,physical properties,electrical properties,oil content,and pore structure.At the same time,based on geological analysis,the effects of reservoir lithology,physical properties,pore structure,and wettability on flooding were analyzed,revealing the change characteristics of water flooded layer before and after water flooding and its effect on the water flooded layer.Reveal the change characteristics of the flooded layer before and after water flooding and its impact on the interpretation of the flooded layer.Based on the water flooding experiment,a theoretical numerical simulation method for the simulation of the water flooding process using the material balance method of variable multiple injection water was studied to obtain the key parameters for the quantitative assessment of water flooded reservoirs.By analyzing the production test and well logging data,the characteristics of well logging response in freshwater flooded layers are analyzed and summarized,and the characteristics parameters of water flooded layers are effectively extracted to study the criteria for the classification of flooding levels and interpretation of the maps.The qualitative identification method of water flooded layers such as three saturation differences and multi-parameter comprehensive identification of water-flooded layers are proposed.Using a combination of qualitative identification and quantitative evaluation methods to form a complete set of comprehensive logging evaluation system of freshwater flooded layers,to achieve the unity of water flooded layer evaluation methods and models,it provides technical support for horizontal comparison of multiple wells and deployment description of remaining oil regions.