An initial acoustic impedance modeling method based on seismic attributes

Abstract

It is common that an initial impedance model should be created first, while performing acoustic impedance inversion. The traditional modeling is horizontally interpolated using inverse distance power method for multiple wells, and vertically controlled by seismic horizons. This method was relatively simple, and could not reflect the seismic facies changes in complex geological conditions, inversion accuracy was not high.

Based on seismic attributes, the method introduced here calculated the weight coefficient with the amplitude of seismic data attributes, waveform correlation coefficient or other seismic attributes to build initial impedance model. The model built with this method could vertically reflect the trend of seismic facies changes and horizontally overcome the mismatching between local geological phenomenon and seismic horizons. This initial model built could descript more detailed changes in the seismic facies, and enhance inversion accuracy under the complex geological conditions.