Determining Type and Range of Reservoir Fluid Change From 4D Seismic Data

4D seismic plays an important role in dynamic monitoring of reservoir development, which can be used to directly image reservoir fluid changes at different development stages, thus helping to optimize and adjust the reservoir development plan. 4D seismic differential attributes are important technical tools to characterize fluid changes. It is difficult to distinguish and identify the different fluid changes occurring in the development process rapidly from traditional 4D attributes; Differential waveform information has a certain indication effect on different fluid changes, but the judgment of positive and negative waveforms has strong subjectivity and multi-solution ( Li et al. 2014 ). A new 4D seismic attribute, 4D seismic fluid change indicator, is defined. The type and range of fluid change can be quickly determined from 4D seismic fluid change indicator. The calculation of the new attribute is fast and the judgment of fluid changes is accurate, and fully meets the demands of reservoir management for the accuracy and timeliness of 4D seismic interpretation.