Estimating time-lapse property changes of a subsurface volume

A computer-implemented method of estimating time-lapse property changes of a subsurface volume, comprising:

• providing actual baseline-monitor pairs of baseline seismic traces of a physical subsurface Earth volume and monitor seismic traces of the physical subsurface Earth volume as obtained from physical seismic measurements in the physical subsurface Earth volume acquired at respectively a first time and second time which is later than the first time by a time lapse;
• feeding the actual baseline-monitor pairs of seismic traces to a trained backpropagation enabled model, and obtaining as output estimates of the time-lapse property changes of the actual subsurface Earth volume,
• wherein the trained backpropagation enabled model has been obtained by:
• generating synthetic models of the subsurface volume with pre-determined property changes before and after a time lapse, said synthetic models comprising seismic velocities;
• computing baseline-monitor pairs of synthetic seismic traces using the models generated before and after the time lapse wherein the baseline synthetic traces are computed from the synthetic model before the time lapse and the monitor synthetic traces are computed from the synthetic model after the time lapse;
• deriving a ground truth 4D attribute characterizing the time-lapse property changes in the synthetic models;
• training a backpropagation enabled model by feeding the baseline-monitor pairs of synthetic seismic traces and the corresponding ground truth 4D attribute, whereby obtaining the trained backpropagation enabled model.