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The AAPG/Datapages Combined Publications Database

AAPG Bulletin

Abstract


Volume: 60 (1976)

Issue: 2. (February)

First Page: 184

Last Page: 195

Title: Subsurface Environmental Analysis of North Sea Sediments

Author(s): Richard C. Selley (2)

Abstract:

The diagnosis of depositional environments is essential to facies analysis and hence to the search for porous reservoir formations. Modern sedimentary environments tend to generate characteristic vertical sequences of grain size and sedimentary structures. SP and gamma-ray logs can reflect grain-size profiles. Certain log patterns thus can help to identify the environments of sand bodies. Ideally these must be integrated with paleoecologic studies and sedimentologic core logs. Where such data are inadequate or absent, additional useful information includes the presence or absence of glauconite and carbonaceous detritus. Easily recognized in ditch cuttings, these indicate marine/nonmarine and low/high-energy environments, respectively. Integrated with gamma-log patterns th se criteria define some characteristic North Sea facies models.

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