Analysis of large thermal maturity datasets: Examples from the Canadian Arctic Islands

The Paleozoic Hudson Bay Basin in northern Canada: New insights into hydrocarbon potential of a frontier intracratonic basin

“…Previous comparisons of Rock-Eval results with other thermal indicators have identified inaccuracies in some T max -based maturation interpretations, including incorrect evaluation of thermal rank in the case of hydrogen-rich organic matter (T max suppression; Snowdon, 1995;Dewing and Sanei, 2009) and erratic S2 and T max values in strata of low organic matter content (Dewing and Sanei, 2009). Samples with S2 > 0.35 mg HC/g rock provide the most reliable T max values (Dewing and Sanei, 2009).…”

“…Samples with S2 > 0.35 mg HC/g rock provide the most reliable T max values (Dewing and Sanei, 2009). The analyses presented here include data with S2 > 0.35 mg HC/g rock and T max above 410°C (770°F), with incremental corrections of 1°C (33.8°F) for every 50 mg HC/g TOC of HI values above 150 mg HC/g TOC (Snowdon, 1995).…”

Shale oil occurring between salt intervals in the Dongpu Depression, Bohai Bay Basin, China

“…5E), significantly decreasing the average value shown in Table 1. These abnormally low T max values could be caused by the presence of bitumens (Bordenave et al, 1993;Dewing and Sanei, 2009 and references therein). As shown in Fig.…”

Fractal characteristics of Upper Cretaceous lacustrine shale from the Songliao Basin, NE China

“…The samples have OSI (oil saturation index) values ranging from 3.09 to 186.19 mg HC/ g TOC, with an average value of 69.80 mg HC/g TOC (Table 1). The T max value represents the temperature at which the S 2 peak is at its maximum, ranging from 427 to 460 C, with an average of 443 C. It should be noticed that the poor S 2 values will decrease the confidence of T max values, especially those samples with S 2 values <0.5 mg HC/g rock (Dewing and Sanei, 2009), meanwhile, T max values might be anomalous or suppressed due to the carry-over effect of S 1 onto S 2 (Bordenave et al, 1993;Dewing and Sanei, 2009;Wang et al, 2015; and references therein). In samples studied, SLB12, SLB14, and SLB16 show poor S 2 values, and samples of SLB6, SLB7, SLB9 and SLB19 present high ratios of S 1 and S 2 , indicating the lower confidence of T max values of those samples, however, most of them should be in the oil generation stage, deriving from their burial depths and OSI values.…”