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The Wells drilled through steeply dipping beds can generate anomalously thick results. This tool attempts to calculate the true stratigraphic thickness of a lithologic package bounded by two calculated grids.
Data tab
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Upper Surface Grid
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This dropdown sets the upper surface grid. Generally, this will be a grid of the top of the formation.
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Lower Surface Grid
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This dropdown sets the upper surface grid. Generally, this will be a grid of the top of the formation.
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Output Isopach Grid
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This entry sets the name of the newly calculated isopach grid. Either enter a new name, or select an existing grid to overwrite.
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Isopach Grid Title
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This option sets the title of the computed isopach grid.
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TST tab
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Apply TST Correction
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This option applies the true stratigraphic thickness correction TST = TVD (cos θ), where θ is the true formation dip.
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Grids are Seismic Time
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By default, Petra assumes that the upper and lower grids are formation tops in TVD. This option adds an additional step to multipy the values in the grid by a specified velocity.
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Calculated Dip From
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This dropdown sets how the TST calculation finds formation dip. Formation dip can be calculated from the top grid, the bottom grid, or an average of the two.
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Dir tab
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Grid Folder
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Navigate to select folder to store Grids.
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