Investigation Of Water Flooded Layer On Logging Interpretation Method In HD1Area Of HD Oilfield

Due to the early exploitation without water injection, the formation pressure continued to decline since well area1of the HD oil field put into exploitation in1999. Along with the increase of water injection exploitation time, the injected water and formation water began to invade into the reservoir since the exploitation began in September2006, making different degrees of reservoir water flooding. In this paper, studies on the situation, carries out a small layer flooding level dividing the study area, an analysis on flooding regular pattern, and the distribution features of remaining oil.According to injection-production dynamic material and water injection well tracer analysis data of the research area, it is concluded that the flooding mode is formation water flooded in the study area. Combined with the analysis of water ratio variation in the flooded wells, there are three water flooded mechanisms summarized: edge water along the layer of water flooded, bottom water slow increase of water flooded and bottom water coning of water flooded.After water flooding, the reservoir performance in conventional logging as to reduce the flooding layer resistivity than the non-flooded reservoir resistivity, as the flooding intensity higher, the resistivity will lower in flooded layer. And in the dual lateral Logging on flooded layer performance for increased resistance invasion. The AC will increase after the flooding and the DEN will decrease, the GR will decrease. In order to analyze the impact of flooding on reservoir heterogeneity, propose models based on the core scale logging, introduction of the neural network to establish the detailed interpretation of models for vertical wells reservoir parameters in the study area. Based of detailed interpretation of reservoir parameters in the study area, the interlayer of Dong He sandstone in study area will be put into three categories:interlayer of calcareous sandstone, interlayer of laminated shaly sand calcium and interlayer of laminated shaly sand. From summing up the well logging response’s characteristics of three categories interlayer, and establishing the well logging criterion of identificationd and analyse their pattern.In order to accurately distinguish the reservoir flooded, this study application of qualitative and definite quantity methods to explain the flooded layer, and finally analyzed using the definite quantity calculation of reservoir water saturation (Sw), water content (Fw), oil displacement efficiency (η) to divided the water flooded-level method. This method based on pressure coring data analysis, establish the definite quantity calculate the water saturation model, the model of water content and oil displacement efficiency model. And using pressure coring data analysis to analyze the flooding situation and combined with the testing data to give a flooded level criteria for the classification in the study area, and application of standards combined with calculation of parameters to divide flooded leve for sublayer of13wells in the study area, the accuracy rate is up to88.9%. Using the flooding level divided of well sublayer in study area, analysis the water flooded layer of the vertical distribution characteristics of the study area and analysis the sublayer of No.4,5,6flat flood out pattern. Finally use numerical reservoir simulation technology, combined with the results of flooded layer explain, analyze the vertical distribution characteristics of the remaining oil in the study area and the sublayer of horizontal distribution characteristics, obtained the sublayer of the structural highs of the well of H48, H40, H36, H34wells around have a big remaining oil saturation, the available reserves is higher.