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The AAPG/Datapages Combined Publications Database

GCAGS Transactions


Gulf Coast Association of Geological Societies Transactions
Vol. 50 (2000), Pages 399-409

Crossplots of Nuclear Logging Relationships Aid in Estimating Sizes and Shapes of Sands to Improve Maps

Rob L. Allen


Much more detailed maps of clastic formations can be made by extracting large quantities of additional depositional information from commonly available well logs. Quantitative analysis of log patterns and extractions of log wavelets can provide improved estimates of the shapes of sandstone reservoirs and other sediments. Traditional interpolation and extrapolation techniques have been replaced with current laws, wave evaluations, and particle diffusion models. Integrated sedimentation emulation (ISE) programs apply mathematics derived to model actual natural processes that distributed clastics. Combinations of properties extracted from gamma ray, neutron, and density type logs have been used to make horizontal lithofacies patterns on crossplots. Characteristics of plot patterns have frequently revealed shapes of sedimentary units such as channels, lacustrine sediments, marshes, beaches, and bars.

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