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Geothermal Energy

Science – Society – Technology

Table 4 Petrophysical rock properties of the outcropping andesite units and reservoir core samples of the Los Humeros geothermal field

From: The impact of hydrothermal alteration on the physiochemical characteristics of reservoir rocks: the case of the Los Humeros geothermal field (Mexico)

Lithology

ρP

ρB

ɸ

K

λ (dry)

λ (sat)

α (dry)

α (sat)

[g cm−3]

[g cm−3]

[%]

[m2]

[W m−1 K−1]

[W m−1 K−1]

[10 −6 m2 s−1]

[10 −6 m2 s−1]

Outcrop samples

 Teziutlán andesites total

2.72/2.72

(142) ± 0.06

2.53/2.60 (131) ± 0.19

6.9/2.7 (126) ± 7.3

1.0E-14/4.6E-17 (92) ± 3.1E-14

1.32/1.35 (112) ± 0.32

1.50/1.52 (112) ± 0.12

0.82/0.86 (110) ± 0.15

1.10/1.09 (110) ± 0.16

  Teziutlán a. porous

2.76/2.75 (37) ± 0.04

2.30/2.35 (37) ± 0.15

16.9/14.7 (37) ± 4.6

3.0E-14/9.5E-15 (24) ± 4.4E-14

0.89/0.90 (32) ± 0.10

1.47/1.48 (32) ± 0.08

0.81/0.74 (30) ± 0.24

1.00/1.00 (32) ± 0.06

  Teziutlán a. massive

2.71/2.71 (105) ± 0.05

2.63/2.65 (94) ± 0.10

2.7/2.1 (89) ± 2.5

3.1E-15/4.3E-18 (68) ± 2.0E-14

1.49/1.56 (80) ± 0.18

1.52/1.54 (80) ± 0.13

0.83/0.86 (80) ± 0.10

1.14/1.14 (78) ± 0.17

 Cuyoaco andesites

2.64/2.65

(50) ± 0.02

2.55/2.61

(32) ± 0.10

4.0/1.4 (32) ± 4.1

4.0E-15/5.1E-18 (26) ± 1.6E-14

1.46/1.47 (47) ± 0.26

1.67/1.63 (38) ± 0.21

0.84/0.86 (48) ± 0.10

1.38/1.38 (38) ± 0.18

Reservoir samples

 Ignimbrite

2.36/2.43 (3) ± 0.14

1.64

(2)  ± 0.01

32.9 (2)  ± 0.04

5.3E-18 (2)

 ± 1.5E-18

0.67/0.70 (3) ± 0.16

1.31/1.37 (3) ± 0.22

0.48/0.47 (3) ± 0.08

0.87/0.86 (3) ± 0.13

 Ignimbrite/andesite breccia

2.66/2.69 (4) ± 0.08

2.17/2.12 (3) ± 0.10

19.6/22.1 (3) ± 4.7

1.4E-14/1.5E-14 (3) ± 1.3E-14

0.99/0.85 (4) ± 0.43

1.41/1.41 (4) ± 0.22

0.59/0.63 (4) ± 0.19

0.91/1.41 (38) ± 0.62

 Rhyolite

2.58/2.58 (4) ± 0.01

2.39/2.40 (4) ± 0.01

7.1/7.1 (4) ± 0.3

7.3E-17/3.6E-17 (3) ± 6.8E-17

2.22/2.24 (4) ± 0.09

2.39/2.45

(4) ± 0.16

1.23/1.22 (4) ± 0.04

1.63/1.66 (4) ± 0.12

 Trachyandesite

2.69/2.71 (9) ± 0.07

2.34/2.31 (8) ± 0.16

13.22/14.7 (8) ± 8.0

8.1E-16/1.7E-16 (8) ± 1.1E-15

1.67/1.76 (9) ± 0.28

1.82/1.86 (9) ± 0.11

0.93/0.98 (9) ± 0.11

1.41/1.48 (9) ± 0.29

 Basaltic—andesitic lava

2.69/2.72 (62) ± 0.11

2.36/2.36 (39) ± 0.14

13.99/15.1 (39) ± 4.9

1.4E-15/1.9E-16 (40) ± 3.2E-15

1.68/1.68 (61) ± 0.32

1.97/2.01 (61) ± 0.24

0.91/0.91 (61) ± 0.15

1.40/1.43 (61) ± 0.29

 Silicified lava

2.64/2.63 (9) ± 0.05

2.27/2.27 (6) ± 0.12

14.5/13.4 (6) ± 3.9

1.2E-15/2.5E-16 (5) ± 2.3E-15

2.08/2.06

(9) ± 0.55

2.39/2.48

(9) ± 0.53

1.15/1.17

(9) ± 0.11

2.39/2.48 (9) ± 0.53

 Skarn

2.82

(2)  ± 0.03

2.78 (1)

1.2 (1)

3.6E-15 (1)

2.65

(2)  ± 0.45

2.87

(2)  ± 0.51

2.36

(2)  ± 1.48

1.78 (2)  ± 0.31

 Marble

2.72/2.73 (6) ± 0.01

2.67/2.67 (4) ± 0.04

1.9/1.9 (4) ± 0.9

2.6E-14 (2)  ± 2.6E-14

2.10/2.18 (4) ± 0.35

2.80/2.86 (4) ± 0.38

1.10/1.11 (4) ± 0.13

1.88/1.90 (4) ± 0.37

Lithology

cp

VHC

VP (dry)

VP (sat)

VS (dry)

VS (sat)

χ

 

[J kg−1 K−1]

[J m3 K−1]

[m s−1]

[m s−1]

[m s−1]

[m s−1]

[10-3 SI]

Outcrop samples

 Teziutlán andesites total

765/766 (14) ± 40

1963/2044 (15) ± 148

3787/3879 (138) ± 1204

5341/5425 (117) ± 1022

2200/2286 (132) ± 683

3168/3213 (114) ± 619

6.10/5.70 (80) ± 2.85

    Teziutlán a. porous

772/774 (5) ± 27

1767/1761 (4) ± 59

2863/2972 (37) ± 826

4908/5196 (28) ± 799

1667/1762 (37) ± 474

2889/3009 (28) ± 523

4.11/4.11 (25) ± 1.55

    Teziutlán a. massive

762/765 (10) ± 46

2035/2044 (11) ± 92

4125/4384 (101) ± 1145

5476/5556 (89) ± 1050

2407/2561 (95) ± 639

3259/3285 (86) ± 622

7.00/6.52 (55) ± 2.86

 Cuyoaco andesites

752/744 (7) ± 26

1941/1924 (7) ± 127

4142/4029 (48) ± 1039

5280/4893 (37) ± 1314

2457/2377 (48) ± 602

3083/2972 (37) ± 775

2.37/2.47 (23) ± 1.27

Reservoir samples

 Ignimbrite

795 (1)

1272 (1)

2925/2955 (3) ± 214

2875/2842 (3) ± 119

1642/1727 (3) ± 185

1665/1691 (3) ± 87

4.15 (2) ± 0.03

 Ignimbrite/andesite breccia

769

(2) ± 17

1685 (2) ± 136

3345/3379 (4) ± 1495

4140/3575 (3) ± 1102

2007/1982 (4) ± 1026

2122/1934 (3) ± 540

7.31/10.68 (3) ± 6.08

 Rhyolite

–

–

3188/3418 (4) ± 775

4821/4856 (4) ± 811

1723/1865 (4) ± 337

2549/2473 (4) ± 514

2.09/2.18 (4) ± 0.29

 Trachyandesite

755/745 (3) ± 23

1758/1726 (3) ± 67

3750/3812 (9) ± 570

4173/3876 (9) ± 923

2061/2053 (9) ± 261

2405/2239 (9) ± 483

4.46/0.23 (6) ± 6.61

 Basaltic – andesitic lava

791/783 (21) ± 39

1867/1856 (21) ± 198

3854/3836 (60) ± 571

4126/4017 (61) ± 700

2148/2145 (60) ± 312

2304/2200 (61) ± 416

3.40/0.27 (40) ± 4.69

 Silicified lava

776/776 (4) ± 5.4

1823/1824 (4) ± 93

3933/3777 (7) ± 605

4128/4251 (7) ± 545

2060/2029 (7) ± 313

2331/2360 (7) ± 339

0.29/0.03 (7) ± 0.66

 Skarn

762

(2) ± 9.8

1966 (2) ± 242

3483 (2) ± 416

3022 (2) ± 1427

1677 (2) ± 16

1659 (2) ± 827

0.045

(1)

 Marble

807/808 (3) ± 3.3

2146/2134 (3) ± 35

2616/2797 (5) ± 459

4189/4555 (5) ± 1005

1490/1549 (5) ± 206

2265/2634 (5) ± 634

0.12/0.008 (5) ± 0.28

  1. Arithmetic mean values in normal font, the numbers in bold represent the median
  2.  ± = standard deviation; () = number of analyzed plugs; ρP = particle density; ρB = bulk density; ɸ = porosity; K = permeability; λ = thermal conductivity; α = thermal diffusivity; VP = P-wave velocity; VS = S-wave velocity; cp = specific heat capacity; VHC = volumetric heat capacity; X = magnetic susceptibility; (dry) or (sat) = analyzed at dry or saturated conditions; for sample classifications refer to Tables 5 and 6
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