Sedimentary characters and Depositional models of the upper Sha-Ⅲ member of the oligocene Shahejie formation in the central Uplift zone, Huimin depression, China

摘要

This paper deals with the sedimentology and depositional model for a shore to shallow lake shoal, which developed during the upper Sha-Ⅲ Member of the Oligocene Shahejie Formation (abbreviated as Es3u) according to analyses of core, thin sections, heavy minerals, well-logging and seismic reflections. Five microfacies, i.e., fore-shoal, outer shoal edge, shoal core, inner shoal edge, and back-shoal, have been regognized in this shore to shallow lake shoal. The sandbody and its petrophysics are the best with respect to reservoir property. The shoal depositional environment was associated with storm deposits.