Abstract

In the Permian Basin, sequence stratigraphic interpretations typically relate variations of stratal geometry to changes in the rates of eustatic sea-level change, tectonic subsidence and sediment supply. Here, we also recognize the important role of compaction as a primary control of sequence architecture and development. In particular, compaction-enhanced sequence boundaries are substantially modified by compaction-induced differential subsidence. They are characterized by rotated toplap strata which dip basinward and are onlapped by less steeply dipping strata of the succeeding sequence. Changes of platform physiography as a direct result of compaction-induced deformation frequently exert a strong control on karst formation, and the stacking patterns and development of succeeding sequences. These effects are most significant when progradation occurred over antecedent aggradation or erosional platform margins. Direct comparison between the geometry and relationships of ‘compaction-enhanced’ unconformities observed at outcrop to those commonly seen in seismic sections points towards compaction as a common cause. Compaction-induced differential subsidence played a significant role in shaping the geometry, architecture and development of depositional sequences in the Permian Basin.