A computer implemented method for assessing porosity and water saturation cutoff values for hydrocarbon volume estimation, the method comprising: obtaining (502, 504), using an electronic processor, a plurality of water saturation and porosity value pairs for a plurality of locations in at least one borehole; plotting, using an electronic processor, the plurality of water saturation and porosity value pairs on a graph, wherein the graph comprises a water saturation axis and a porosity axis; estimating, using an electronic processor and based on the plurality of water saturation and porosity value pairs, an estimated maximal hydrocarbon volume for the at least one borehole; representing, using an electronic processor, a plurality of percentiles, for porosity and water saturation cutoffs values, of the estimated maximal hydrocarbon volume on the graph; causing, using an electronic processor, the graph to be displayed to a user, wherein the graph represents an estimated maximal hydrocarbon volume for porosity and water saturation cutoffs values whereby the user can visually observe a combined sensitivity of estimated maximal hydrocarbon volume to porosity and water saturation cutoffs values; from the displayed graph, selecting a porosity cutoff value and a water saturation cutoff value that reflect a limited combined sensitivity of the estimated maximal hydrocarbon volume to the selected porosity and water saturation cutoffs values; determining an estimated available hydrocarbon volume for the selected porosity cutoff value and the selected water saturation cutoff value; and deciding, based on the estimated available hydrocarbon volume and on the limited combined sensitivity of the estimated maximal hydrocarbon volume to the selected porosity and water saturation cutoffs values to extract at least some hydrocarbon from the borehole. obtaining (502, 504), using an electronic processor, a plurality of water saturation and porosity value pairs for a plurality of locations in at least one borehole; plotting, using an electronic processor, the plurality of water saturation and porosity value pairs on a graph, wherein the graph comprises a water saturation axis and a porosity axis; estimating, using an electronic processor and based on the plurality of water saturation and porosity value pairs, an estimated maximal hydrocarbon volume for the at least one borehole; representing, using an electronic processor, a plurality of percentiles, for porosity and water saturation cutoffs values, of the estimated maximal hydrocarbon volume on the graph; causing, using an electronic processor, the graph to be displayed to a user, wherein the graph represents an estimated maximal hydrocarbon volume for porosity and water saturation cutoffs values whereby the user can visually observe a combined sensitivity of estimated maximal hydrocarbon volume to porosity and water saturation cutoffs values; from the displayed graph, selecting a porosity cutoff value and a water saturation cutoff value that reflect a limited combined sensitivity of the estimated maximal hydrocarbon volume to the selected porosity and water saturation cutoffs values; determining an estimated available hydrocarbon volume for the selected porosity cutoff value and the selected water saturation cutoff value; and deciding, based on the estimated available hydrocarbon volume and on the limited combined sensitivity of the estimated maximal hydrocarbon volume to the selected porosity and water saturation cutoffs values to extract at least some hydrocarbon from the borehole.