Identification of Waterflooded Layers and Analysis of Waterflooded Conditions in Block X of Low Porosity and Permeability Oilfield

On the basis of the original interpretation of flooded layer, aiming at the reservoir property and development situation of X block in low porosity and permeability oilfield, the interpretation of flooded layer adopts the method of qualitative identification and quantitative calculation of logging response, comprehensive analysis of coring data and production data, and the combination of static analysis results and dynamic production conditions to analyze the flooding condition of X block infilling well. The results show that there are three characteristics in the logging response identification of the waterlogged layer: U-shape change of resistivity curve, increase of acoustic time difference curve and distortion of natural gamma curve. Quantitative calculation of displacement efficiency is an important parameter to predict the ultimate oil recovery, evaluate the oil field development effect and determine the flooding condition. The water-flooded interval of the infill well in Block X is concentrated in the main reservoir or banded sand body. Select the combined fishing test beds with fishing test beds or those that have been in operation for more than 3 months (the connection between sand bodies and injection Wells is emphasized) to verify the interpretation results of waterlogged beds. Compared with 11 Wells with higher water content, 9 Wells were consistent with the original water flooding interpretation results, and the coincidence rate was 82%. On this basis, the remaining potential of the unopened horizon in the infill block is analyzed to provide a theoretical basis for filling holes in the future.