Light Hydrocarbon Geochemistry of Oils in the Alpine Foreland Basin: Impact of Geothermal Fluids on the Petroleum System

Table 1

Sample list with selected reservoir conditions, chemistry, and isotopic composition of reservoir water.

Sample code	Sample type	Res. age	Depth	Res. temp.	°API	Mch/Tol	Ch/B	C15−/	Water chemistry [mg/l]											Water [V-SMOW]
			[m]	[°C]				C15+	Li^+	Na^+	K^+	Mg^2+	Ca^2+	F^−	Cl^−	Br^−	J^−			H	O
A	OA	Eo			31.8	85.7	257.1	2.6
B1	OA	Eo				19.1	72.1	4.2
B2	OA	Eo				23.3	174.2	3.3
B3	OA	Eo				15.5	98.4	3.5
C	O, W	Eo	1151		36.1	10.2	28.2	4.3	0.2	1965	12	12	44	8.5	2910	22.2	5.2	0	11
D1	OA	Eo	1059			83.7	904.0	2.7
D2	O, W	Eo	1142	55	32.6	79.9	517.3	3.3	0.2	1335	7	7	36	10.0	1945	13.1	2.2	1	5
D3	OA	Eo				98.2	40.1	2.2
D4	O, W	Eo	1048	48	32.6	82.7	209.7	2.8	0.6	1626	12	9	25	9.0	2104	15.2	3.7	0	1		−7.1
E1	OA	Eo				4.5	6.3	3.6
E2	O	Eo	1869	65	33.1	3.3	3.8	3.4
F1	O	Eo + Ce	2030		34.8	3.3	4.2	4.2
F2	O	Ce	2381		33.1	3.8	5.2	4.0
G1	OA	Ce				5.1	8.9	3.5
G2	OA	Eo				2.4	2.6	4.0
H	OA	Eo				3.3	3.3	3.3
I1	O, W	Eo	2463	86	32.1	2.4	3.2	3.4	3.2	4357	47	25	215	2.7	6862	59.8	9.9	3	45	−24.6	−0.6
I2	O	Eo	2465	86	32.1	2.8	3.6	4.2
J1	O	Eo	2058	68	35.3	1.7	3.0	3.8	1.3	6337	51	38	472	6.1	9498	102.4	24.3	0	75
J2	O	Eo	2118	80	37.1	1.8	2.3	0.5
J3	WA	Eo							1.2	4002	58	24	194	2.1	6562	50.4	9.3	1	1	−39.6	−4.3
J4	WA	Eo							0.9	4073	53	20	168	2.3	6769	38.2	7.1	1	22	−39.5	−2.7
J5	O	Eo	2067	79	35.3	1.9	3.0	3.9
J6	O	Eo	2106	69	35.8	1.9	2.4	4.0
J7	WA	Eo							1.2	5028	74	29	365	2.8	8804	43.0	7.6	1	128	−29.1	−3.45
K	O	Ce	2341	71	33.2	6.8	6.4	3.4
L1	OA	Eo				2.8	4.1	3.5
L2	O, W	Eo	2059	69	36.6	2.0	2.7	4.9												−23.1	−1.3
L3	O, W	Eo	2038	69	36.6	2.2	2.7	5.2												−12.9	0.6
M	OA	Eo				3.0	6.4	3.1
N1	O	Eo	1700	62	36.4	2.1	3.6	3.2
N2	O	Eo	1754	62	36.4	2.6	3.4	4.7
N3	O	Eo	1752	62	36.4	2.7	3.5	4.8
N4	O, W	Eo	1683	62	36.4	2.4	3.3	5.6	2.4	5926	45	53	212	1.5	9299	74.6	18.2	2		−30.6	−2.2
N5	O	Eo	1694	62	36.4	2.3	3.7	3.6
N6	O, W	Eo	1761	62	36.4	2.4	3.3	4.9	3.0	6758	47	84	338	2.1	10748	96.5	24.7	1	2	−23.0	−0.4
O	O	Eo	1620	60	37.8	3.0	4.4	5.3
P	O	Eo	1706	58	37.2	2.5	5.2	8.1
Q	OA	Ce			34.4	5.8	9.4	3.8
R	OA	Eo			33.4	3.8	6.0	3.0
S1	OA	Eo				6.5	15.7	3.0
S2	O	Ce	2754	90	31.7	6.4	4.4	2.6
S3	O	Eo	2230	85	31.9	9.6	7.7	3.4
T	O	Eo				8.3	11.4	4.5
U1	OA	Ce				59.3	130.2	1.6
U2	O, W	Ce	1611	62	30.2	45.9	30.2	2.1	0.2	929	19	5	17	8.4	888	4.7	1.2	1	19
U3	O, W	Ce	1577	57	30.2	56.5	38.9	2.4												−51.4	−5.8
U4	O, W	Ce	1574	57	30.2	43.1	30.6	2.2	0.5	1990	30	5	24	0.6	1821	5.0	1.7	116	30	−41.4	−4.8
V	OA	Ce				50.4	88.8	1.9
W	O	Eo	2780	87	34.7	1.7	2.7	3.0
X	O	Eo	3342	110	31.4	2.2	2.9	3.3
Y	O, W	Eo	2240	85	32.8	3.5	4.4	2.7	1.7	4994	41	30	70	1.8	7557	51.2	6.5		159
Z	OA	Eo			33	4.6	15.1	4.1
AA1	O, W	Eo	1819	70	35.5	3.3	9.8	3.4	2.0	2681	40	18	49	4.1	3433	26.1	6.8	3	192
AA2	O, W	Eo	1810	73	35.6	2.8	4.9	3.1												−36.5	−2.5
AA3	O, W	Eo	1855	71	35.3	3.3	10.3	4.1	2.0	3117	33	12	20	4.7	4155	31.8	9.1	18	76	−48.3	−4.2
AA4	OA	Ce				6.1	18.5	2.6
AB	O, W	Eo	1408	63	35.5	4.5	15.0	3.0	1.1	4143	83	55	139	2.0	5823	54.0	15.1	1	3
AC	O	Eo	2197	85	34.5	3.1	9.3	4.3
AD	O	Eo	2503	86	33.5	2.0	4.9	4.1

True vertical depth subsurface. Ratio calculated based on all peaks above chromatographic baseline. O, oil; OA, oil archival; W, water; WA, water archival; Res. age, reservoir age; Ce, Cenomanian; Eo, Eocene; Res. temp., reservoir temperature; Mch, methylcyclohexane; Tol, toluene; Ch, cyclohexane; B, benzene.