Abstract
Fischer plots are a technique that is used to graph changes in accommodation in cyclic carbonate successions. They typically depict the cumulative departure from the average cycle thickness as a function of the cycle number or stratigraphic depth. Many applications of Fischer plots focus on their construction from exposed cyclic carbonate successions. No published programs allow the direct construction of Fischer plots from digital wireline well-logs or dynamic presentations of Fischer plots. Here, we introduce a program known as FischerLab, which facilitates the generation and analysis of Fischer plots. In addition to accepting interpreted stratigraphic data input, FischerLab facilitates the interpretation of digital wireline logs for the generation of Fischer plots in cycle and depth domains, as well as in a dynamic evolving cycle and relative depth domain from an easy-to-use interface. The dynamic construction facilitates the correlation of specific stratigraphic packages to parts of the accommodation cycle while simultaneously tracking the locus of the mean subsidence vector. We demonstrate the use of FischerLab on data derived from the carbonate succession outcrops of the Al-Athrun Formation, Libya, and the Glen Rose Formation, Central Texas, USA, as well as on wireline well-log data from the Western Great Bahama Bank, the Bahamas.
Highlights
Fischer plots are diagrams that depict the change in accommodation derived from the aggradational stacking patterns in cyclic carbonate successions composed of multiple genetic cycles
The study originally labeled the vertical axes as ‘vertical space’ and the horizontal axes as ‘time.’ The plots display a cumulative departure from the mean cycle thickness plotted against the cycle number
The cumulative departure from the mean thickness (CDMT) is the difference between the actual depth and the depth that the cycle top would have occurred at if all of the cycles were of the same thickness, as given by Day [3]
Summary
Fischer plots are diagrams that depict the change in accommodation derived from the aggradational stacking patterns in cyclic carbonate successions composed of multiple genetic cycles. The study originally labeled the vertical axes as ‘vertical space’ and the horizontal axes as ‘time.’ The plots display a cumulative departure from the mean cycle thickness plotted against the cycle number. Fischer plots are useful tools for the investigation of the variation of thickness within a cyclic carbonate succession. Dynamic construction facilitates the interpretation of the Fischer plots and the correlation of parts of a stratigraphic succession with cycles of the Fischer plot in order to investigate which accommodation regime corresponds to each genetic package. Dynamic Fischer plot analysis depicts the subsidence history of the succession by tracking the locus of the mean subsidence vector as each new cycle is added
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