Study On The Environmental Correction Method Of High Resolution Acoustic Log And Self-potential Log

Log information is affected by measuring environment which conclude well diameter,mud density,mud cake,temperature,pressure,sidewall asperity,mud invaded zone,apparatus outside diameter,interspace,decenter unavoidably. These factors distort actual log information on different degree. So the environmental correction to primary log information becomes important link which can ensure quality of log information and raise use value.The article derives new formula of formation water resistivity in view of fresh waterflooded reservoir and Derives computing method in view of high density mud well. The article builds the method of height and shale correction. Finally it creates a suit of systematizing SP environmental correction and formation water resistivity calculating software which can complete the interpretation work speedily. The article derives new formula of formation water resistivity in view of fresh waterflooded reservoir and derives computing method in view of high density mud well. The article builds the method of height and shale correction. Finally it creates a suit of systematizing SP environmental correction and formation water resistivity calculating software which can complete the interpretation work speedily.Because the log environments have large effect to SDT log, it is necessary to make environmental correction to SDT log. The article builds a suit of numerical modeling software which is used to calculate SDT in different borehole environment by building single-pole centralized blazing and decenter blazing borehole model,vertical stratification medium borehole model out the well. The article researches interval that hole diameter is saltatory with two-dimensional finite difference method. It also builds SDT correction formula which can calculate formation porosity exactly when layer has lamina.