Well-seismic ties allow rock properties measured at well locations to be compared to seismic data, and therefore are useful for seismic interpretation. We propose to simultaneously tie multiple wells to the seismic image 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 flattened synthetic and real seismograms. Our two-step 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 demonstrated our method using a 3D real seismic image with multiple wells.