Primary sedimentary characteristics and major geologic features of regressive barrier sands are summarized in Fig. 24. Regressive barriers are depositional in nature and prograde seaward through time. The morphology of these barriers is characterized most commonly by a series of shore-parallel, tightly-spaced beach ridges. Vertical sedimentary sequences coarsen-upward and are generally comprised of fine-grained quartzose sand, with gradational internal contacts between depositional units (Fig. 24).
Figures & Tables
Depositional Models of Shelf and Shoreline Sandstones
This lecture course is designed to provide geologic insights towards the development of depositional and exploration models for sandstone reservoirs associated with one or more of a variety of shelf and shoreline environmental settings. Sedimentologic and stratigraphic criteria will be utilized to more accurately predict the subsurface distribution and trend of reservoir quality sandstones. These criteria include a number of basic geologic “tools” such as well logs, cores, outcrop, seismic, and isopach and structure maps, all of which will be utilized in varying degrees during this course. Equally important in the development of models for shelf and shoreline sandstones is the subsurface analysis of modern depositional systems. An understanding of the three dimensional framework of modern clastic sedimentary environments is critical to the proper interpretation of vertical sequences, lateral facies relationships, sand body geometries and inhomogeneities of sandstone reservoirs.