All-Reflector-Tracking-Based 3D Seismic Sequence Analysis for Shale Gas Reservoir Prediction: Case Study From the Lower Silurian Longmaxi Formation, Southern Sichuan Basin, Southwest China Available to Purchase

In this study, seismic sequence analysis based on all-reflector tracking method (Zhong et al., 2010) was successfully applied to a 3D seismic data volume in the lower Silurian Longmaxi Formation, southern Sichuan Basin, southwest China for gas shale reservoir prediction. As a result, nine horizons (events) in the interval were tracked, six of which were identified as unconformable sequence boundaries by the truncation and/or onlap reflection terminations against them. By the boundaries, the lower Silurian Longmaxi Formation was subdivided into five seismic sequences. Based on the temporal and spatial distribution of the sequences, two sequences, which are sequence 1 at the bottom and sequence 5 at the top were predicted as favorable intervals for shale gas reservoirs, which matched well with existing well test data.