With source and receivers in place, the source is fired and a recording is made. In traveltime tomography, this recording is later used to compute the time required for the seismic energy to travel from source to receiver. Data are acquired for every combination of source and receiver stations. Ray paths connecting sources and receivers for a typical survey are shown in [[:file:cross-borehole-tomography-in-development-geology_fig2.png|Figure 2]]. These traveltime data are then used to infer the seismic velocity field between the wellbores. If attenuation measurements can be made on the data, then the seismic Q-factor can also be imaged in the reservoir. Since the number of source/receiver pairs is usually in the thousands, data acquisition can be a slow process. Wirelines with multiple receivers appropriately placed can reduce the survey time. | With source and receivers in place, the source is fired and a recording is made. In traveltime tomography, this recording is later used to compute the time required for the seismic energy to travel from source to receiver. Data are acquired for every combination of source and receiver stations. Ray paths connecting sources and receivers for a typical survey are shown in [[:file:cross-borehole-tomography-in-development-geology_fig2.png|Figure 2]]. These traveltime data are then used to infer the seismic velocity field between the wellbores. If attenuation measurements can be made on the data, then the seismic Q-factor can also be imaged in the reservoir. Since the number of source/receiver pairs is usually in the thousands, data acquisition can be a slow process. Wirelines with multiple receivers appropriately placed can reduce the survey time. |