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Book Chapter

Depositional Environments and their Flow Characteristics

Published:
January 01, 2009

Abstract

The theme of this section is that specific depositional environments, deltas for instance, show common patterns of production behavior. Many of these themes repeat again and again from field to field in different basins and in various geographical areas around the world. The knowledge of the production patterns from one field in a specific environment may be applicable to reservoirs with the same depositional environment elsewhere.

Each of the depositional environments has a specific character in terms of the flow geology. The macroforms making up a reservoir will have a typical size range and geometry for a particular depositional environment. These combine to give one of the distinctive geometric types; shoreline deposits are commonly layer-cake in geometry whereas meander belts are labyrinthine in form. Certain lithofacies will act as flow barriers; for example, marine shales in deep-water marine reservoirs or coals in fluvial reservoirs. Permeability profiles can be particular to a specific type of depositional environment; channel fills commonly show upward-decreasing permeabilities whereas sediments prograding into standing water will typically exhibit an upward-increasing permeability profile. Production characteristics, the sweep efficiency, and the location of bypassed hydrocarbon volumes can to a large degree be predicted according to the particular depositional environment.

The flow character of a reservoir is strongly influenced by how the various macroforms within a reservoir connect to each other (Larue and Friedmann, 2005). Although individual sand-prone packages tend to link up as connected volumes, on occasion, the boundary between two sand prone macroforms can form a flow restriction.

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Contents

AAPG Memoir

Oil Field Production Geology

Mike Shepherd
Mike Shepherd
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American Association of Petroleum Geologists
Volume
91
ISBN electronic:
9781629810294
Publication date:
January 01, 2009

GeoRef

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