In case 2, reservoir intervals from cores in different wells plot close to each other on ternary pore plots, permitting identification of regionally distributed pore facies. The positions of these point clusters on ternary pore plots record progressive diagenetic destruction of primary rock fabric, forming a diagenetic-intensity gradient. In case 1, multiple reservoir lithofacies from a single well form discrete clusters on ternary pore plots.
Carbonate ternary diagram plus#
Three components account for more than 95% of pores (moldic plus secondary intraparticle, interparticle, and intercrystalline) and define the apexes of ternary pore plots. More than 50 thin sections from 8 wells were point counted. The use of ternary pore plots is illustrated by two case studies of the upper Jurassic (Oxfordian) Smackover Formation in southwestern Alabama. Certain kinds of pore systems have characteristic fluid-flow properties therefore, when pore facies are calibrated to other petrophysical data, pore-facies assignments may become predictors of other reservoir characteristics, such as reservoir performance. Ternary pore plots provide insight into a variety of geological problems, including (1) identification of flow units i.e., stratigraphic intervals that have significantly different fluid-flow properties (2) recognition of diagenetic processes, gradients, and trends and (3) identification of pore facies or characteristic kinds of pore systems that may be of regional extent. Thin-section point-count data are inexpensive and easy to collect, and can be used to guide more expensive engineering analyses. Hence, ternary pore plots complement engineering data, which give information on the sizes of pore-system elements. Ternary pore plots provide information on the shapes and origins of pore-system elements. Lithology, pore network heterogeneity and fracturing represent represent the main controlling factors on carbonate reservoirs. The Reservoir Quality Ternary Plot (RQTP) is used for estimating reservoir properties from well logs. Ternary diagrams whose apexes are carbonate pore types (ternary pore plots) are used to summarize quantitative data derived from point counting of thin sections, using a modification of the genetic carbonate-rock porosity classification of Choquette and Pray (1970). The ternary diagram can be used for reservoir quality classification.
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