We conducted a seismic-sedimentological study to advance interpretation and prediction of lacustrine shale-gas reservoirs in the Yanchang Formation, Ordos Basin, China. The seismic volume was converted into a log-lithology volume and was stratal-sliced to extract seismic geomorphological information. Deltaic facies and depositional history were interpreted. Detailed core analysis data on total organic carbon (TOC), mineral composition, and mechanical properties were correlated to gamma-ray logs, seismic-derived lithology, and facies. Microseismic data were evaluated for reservoir performance in production wells. Finally, shale-gas sweet spots were predicted by mapping relatively high brittleness lithofacies in 3D using seismic attributes. The high-TOC Ch7-1 shale unit is not ideal for shale-gas development because of its ductile nature and a tunnel effect in fracking. Ch7-2 prodelta sediments are optimal drilling targets.
Presentation Date: Tuesday, October 18, 2016
Start Time: 10:20:00 AM
Location: Lobby D/C
Presentation Type: POSTER
