Simultaneous multiple well-seismic ties using flattened synthetic and real seismograms

Well-seismic ties allow rock properties measured at well locations to be compared to seismic data, and therefore are useful for seismic interpretation. Numerous methods have been proposed to compute well-seismic ties by correlating real seismograms with synthetic seismograms computed from velocity and density logs. However, most methods tie multiple wells to seismic data one-by-one, and therefore often fail to maintain lateral consistency among multiple well ties. Moreover, tying a single well, especially a short one, to the corresponding real seismogram can be unreliable without considering nearby wells. We propose to simultaneously tie multiple wells by first flattening synthetic and real seismograms so that all seismic reflectors are horizontally aligned. By doing this, we turn multiple well-seismic tying into a 1D correlation problem. We then simply compute only vertically-variant but laterally-constant shifts to correlate these horizontally aligned (flattened) synthetic and real seismograms. Our two-step correlation method maintains lateral consistency among multiple well ties and improves accuracy of individual well-seismic ties by computing a laterally and vertically optimized correlation of all synthetic and real seismograms. We applied our method to a 3D real seismic image with multiple wells and obtained laterally consistent well-seismic ties.