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By Robert J. Weimer

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Additional info for Deltaic and Shallow Marine Sandstones: sedimentation, tectonics, and petroleum occurrences (AAPG Course Notes 2)

Example text

The references chosen are believed to be a representative sampling of the major processes controlling sedimentation. The examples of ancient petroleum-producing sandstones are likewise believed to best illustrate the geology of known stratigraphic traps. By better understanding the origin of the reservoir rock of known fields, the explorationist has a better chance to discover and to develop efficiently the new fields which are so vital to society. /> ~ <5 "" o 3 « o? u O 2Z at s z o > z s o _J a.

In the following abstract, Coleman and Wright (1974) summarize deformational processes in delta front deposits: River-mouth depositional patterns are modified by sediment deformational processes of sufficient magnitude to endanger severely bottom-supported structures. Several types of deformations are present and include (a) peripheral slumping, (b) differential weighting and diapirism, (c) graben faulting, (d) mass wasting by sediment degassing, and (e) deep-seated flowage. High depositional rates are present near the river mouth and decrease seaward; with time, the bar front oversteepens and rotational slump planes form peripheral to the bar front, moving sediment into deeper water.

The use of this simple classification is illustrated by the authors in a map showing areal distribution of minor internal structures north and east of the modern Mississippi delta (Fig. 5). Variation in distribution of minor structures are related to rates of deposition and other processes (Figs. 7). Near the east side of the delta regular layers occur where rates of sedimentation are high and burrowing intensity by organisms is low. Mottles, irregular layers and homogeneous structures occur on the shelf where rates of sedimentation are slow and oceanic processes predominate.

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