Analysis of a Pull-Apart Basin and Its Associated Fractures in the Woodford Shale, Central Oklahoma

Pull-apart basins are faulting and folding zones with high intensity of fractures that strongly affect the production in unconventional shale gas. While most observations pull-apart were from surface mapping or laboratory experiments, we investigated a nascent basin subsurface. We characterized along strike-slip fault within Woodford Shale by using seismic attributes analyses, including coherence, dip-azimuth, curvature. The results indicate 32 km long, N-S striking displays distinct but young basin, which is ~1.6 3.2 size bounded two quasi-circular faults. curvature attribute map reveals folds, depart main at ~25°, resulting an elliptical basin. Inside series echelon normal faults step into bottom ~80 m total subsidence. propose controls shape brittleness shale, suggest proper as useful tool for investigating fracture subsurface hydrofracturing horizontal drilling shale.