Petrophysical characterization of the Los Humeros geothermal field (Mexico): from outcrop to parametrization of a 3D geological model

Geothermal Energy

Science – Society – Technology

Table 2 Rock properties transferred to reservoir conditions of the Los Humeros geothermal field

Lithology	Model unit*	M	P	T	ɸ	K	ρB sat	λ sat	α sat	Cp sat	VHC sat	V_P sat	V_S sat
Lithology	Model unit*	[m]	[MPa]	[°C]	[%]	[m²]	[g cm⁻³]	[W m⁻¹ K⁻¹]	[10 ⁻⁶ m² s⁻¹]	[J kg⁻¹ K⁻¹]	[J m³ K⁻¹]	[m s⁻¹]	[m s⁻¹]
Undefined pyroclastic deposits	U1	50	≤ 0.93	15–67	41.1–40.5	2.4E-13–2.2E-13	1.89	0.52–0.57	0.27–0.28	2245–2268	3028–3100	2667–2703	1070–1106
Rhyodacite, andesite, basalts	U2	200	0.93–5.56	67–179	15.9–15.6	1.2E-15–8.2E-16	2.37–2.36	0.93–0.97	0.50–0.42	1379–1471	2530–2674	5184–5649	3156–3621
Rhyodacite and Zaragoza ignimbrite	U3	150	5.56–8.85	179–210	21.0–20.7	2.8E-15–2.6E-15	2.24	0.99	0.59–0.57	1658–1689	2726–2742	4489–4528	2783–2822
Faby tuff and andesites	U4	100	8.85–11.04	210–240	20.7–20.5	2.6E-15–2.5E-15	2.24–2.23	0.99–0.97	0.57–0.55	1689–1736	2742–2764	4528–4512	2822–2806
Xaltipan ignimbrite	U5	450	11.04–20.48	240–255	36.4–15.5	4.2E-14–9.9E-15	1.75–2.14	0.60–1.27	0.41–0.72	2339–1569	2787–2387	2355–3330	1352–1966
Teziutlán andesites (30% porous and 70% nonporous lava)	U6	1150	20.48–49.63	255–310	6.81–6.68	7.1E-17–7.0E-17	2.58	1.37–1.33	0.56–0.52	1227–1318	2668–2758	6179–6406	4022–4248
Basement (until 3 km depth, 80% marble, 10% granites and 10% skarn)	U9	1000	49.63–73.58	310–340	1.80–1.81	6.41E-18–6.42E-18	2.72–2.71	2.36–2.38	1.03	1170–1214	2994–3038	7832–7948	4998–5114

*Classification after Calcagno et al. (2020), (weighted) arithmetic mean values in normal font, ρ_B = bulk density, ɸ = porosity, K = permeability, λ = thermal conductivity, α = thermal diffusivity, V_P = p-wave velocity, V_S = s-wave velocity, cp = specific heat capacity, VHC = volumetric heat capacity, sat = saturated, T = reservoir temperature range, P = calculated overburden pressure range, M = estimated average thickness of the unit