Total organic carbon evaluation using geophysical well-logs in Lorraine Coal Basin (NE France)

Open Access

Table 4

Equations used in the calculation of TOC for the Fols 1A well. R²: determination coefficient for each method. RMSE: Root Mean Squared Error for each method compared to TOC values obtained using the method by Schmoker (1979, 1981).

Methods calibration	Eq	Modified TOC equations	R²	RMSE (wt. %)
TOC Schmoker/Passey Ratio	11	$TOC = Δ Log R * 10^{(2.297 - 0.1688 * LOM)} * (19.15 * l n (Δ T) - 83.48)$	0.82	8.52
(Delta log R separation) vs. Rock Eval TOC(Delta log R separation) vs. Schmoker TOC	13	$TOC = 22.117 * Δ Log R^{2} + 6.997 * Δ Log R$	0.79	9.12
	14	$TOC = e^{2.6136 * Δ Log R}$	0.58	14
	15	$TOC = 16.262 * Δ Log R^{2} + 6.5631 * Δ Log R$	0.79	7.04
	16	$TOC = e^{2.4374 * Δ Log R}$	0.62	5.23
Multivariate regression	19	$TOC = 0.73 * Δ t - 0.065 * G a m m a R a y + 0.02 * R - 46.29$	0.82	6.6

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