01806nab a2200193 4500 20260520001752.0 260224s2010 xxu Bouffin, N. 42514 Jensen, J.L. 42515 Efficient detection of productive intervals in oil and gas reservoirs mar. 2010 14/06/2010 ; 10/06/2010 6 p. ; 58-63 Transcripción del resumen del autor. The utility and evaluation of cutoff values for net pay or net-to-gross determination have been hotly debated topics since the 1950s. There are numerous subtleties to cutoffs, but exactly how the values are calculated has largely been overlooked. Most cutoff users have been content to use a regression line to calculate the cutoff value. We show that cutoffs obtained using a regression line are likely to be inferior to estimates produced by other methods. When four methods were applied to two field datasets and compared, regression-based porosity cutoffs were between 1 and 2 pu different than the values that give the smallest number of errors. Monte Carlo simulations broadly support the results obtained from the datasets. One method, the "trial-and-error" method, performed well through most of the tests, reducing errors by 40% from those obtained using the regression line-based cutoff. All cutoff estimation methods have errors, caused by the imperfect relationships we have between variables, such as porosity and permeability. This study shows we have a choice of methods. Because the better method can be easily applied in spreadsheet software, this should be a valuable addition to the petrophysicist's toolbox. 3 Journal of Canadian Petroleum Technology 49 ARTICULO 170901 170901 0 0 0 0 238720 BAAB BAAB 2026-03-05 200045757 0 200045757 2026-03-05 15:13:16 2026-03-05 ARTICULO