A laboratory approach for the calibration of seismic data in the western part of the Swiss Molasse Basin: the case history of well Humilly-2 (France) in the Geneva area

Hefny, Mahmoud; Zappone, Alba; Makhloufi, Yasin; de Haller, Antoine; Moscariello, Andrea

doi:10.1186/s00015-020-00364-4

Swiss Journal of Geosciences

Table 4 Velocities (m/s) at borehole conditions

From: A laboratory approach for the calibration of seismic data in the western part of the Swiss Molasse Basin: the case history of well Humilly-2 (France) in the Geneva area

Sample		P\(_{\text {conf}}\) (MPa)	Compressional waves (m/s)						Shear waves (m/s)
Sample		P\(_{\text {conf}}\) (MPa)	V\(_{\text {p}}\)	A (m/s)	B (m/s)	a	b	\(-\!\!\!\!Z\)\(_{\text {p}}\)\(\times \text {10}^{\text {7}}\)	V\(_{\textit{s}}\)	A (m/s)	B (m/s)	a	b	\(-\!\!\!\!Z\)\(_{\text {s}}\)\(\times \text {10}^{\text {6}}\)
HU01a	X	26	5459	5089	771	0	0.03	1.48	3037	2978	192	0.01	0.02	8.23
HU1b	Y		4826	4421	700	0.05	2.93	1.40	2714	2525	448	0.01	0.03	7.90
HU1b	Z		4907	4316	1078	0.01	0.04	1.33	2804	2757	249	0.01	0.02	7.60
HU03	X	26	4658	4186	892	0.03	0.04	1.26	2503	2309	548	0.01	0.02	6.80
	Y		NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
	Z		4676	4323	743	0.01	0.03	1.27	2570	2414	448	0.01	0.02	6.99
HU06	X	26	4412	4059	790	0.01	0.03	1.22	2425	2337	393	0.02	0.02	6.70
	Y		4633	4348	679	0	0.02	1.33	2480	2219	608	0.01	0.02	7.53
	Z		4408	4015	797	0.03	0.04	1.20	2380	2163	604	0.01	0.02	6.46
HU07	X	48	5404	5123	829	0.01	0.01	1.47	2931	2646	547	0.01	0.02	7.95
	Y		5591	4860	997	0.07	0.07	1.51	3233	2981	349	0	0.03	8.43
	Z		5284	5003	760	0.01	0.01	1.43	3016	2932	173	0.01	0.02	8.18
HU09	X	49	4802	4647	829	0.06	0.01	1.31	2871	2643	484	0.01	0.01	7.81
	Y		4969	4940	550	0.05	0.01	1.45	2866	2639	469	0	0.01	8.07
	Z		4922	4443	1363	0.01	0.01	1.34	2870	2615	526	0	0.01	7.83
HU12	X	53	5168	4478	1697	0	0.01	1.40	3098	2910	476	0.01	0.01	8.38
	Y		5325	4659	1583	0	0.01	1.61	3086	2817	552	0	0.01	8.69
	Z		5234	4562	1724	0.01	0.01	1.42	3075	2804	557	0.01	0.01	8.34
HU13	X	55	4765	4702	410	0.02	0.01	1.26	2941	2882	252	0.01	0.01	7.78
	Y		NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
	Z		4372	4094	834	0.02	0.01	1.17	2745	2670	263	0.01	0.01	7.33
HU14	X	61	5736	5696	686	0.01	0	1.54	3208	3196	57	0.01	0.01	8.59
	Y		5011	4421	700	0.05	2.93	1.60	3221	3207	143	0	0	8.60
	Z		5905	5782	312	0.01	0.01	1.59	3218	3216	56	0.01	0.01	8.65
BX107	X	74\(^{\mathrm{a}}\)	4179	3399	1413	0.01	0.01	1.19	2691	2117	678	0.04	0.03	7.64
BX107	Z	74\(^{\mathrm{a}}\)	5125	4210	1173	0.04	0.02	1.48	2890	2346	584	0.04	0.05	8.36
HU17	X	80	6158	6092	114	0.01	0.02	1.81	3397	3360	122	0	0	10.00
	Y		6608	6087	550	0.02	0.45	1.77	3707	3574	139	0	0.05	9.83
	Z		6157	6048	257	0.01	0.01	1.81	3440	3391	159	0	0	10.1
HU20	X	82	6707	5830	1161	0.01	0.02	1.91	3749	3649	140	0.02	0.02	10.7
	Y		6601	6349	527	0.04	0.01	1.92	3699	3306	511	0	0.02	10.6
	Z		6346	5557	1057	0.01	0.02	1.83	3670	3278	401	0	0.05	10.6
HU21	X	83	6062	5886	331	0	0.01	1.79	3300	3274	109	0	0	9.73
	Y		NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
	Z		5673	5464	390	0.01	0.01	1.66	3268	3118	192	0	0.02	9.59
HU24	X	83	6781	6414	485	0.01	0.02	1.94	3676	3506	309	0	0.01	10.5
	Y		6258	5611	700	0.05	0.18	1.84	3541	3193	410	0	0.02	10.2
	Z		6473	5701	1009	0.01	0.02	1.88	3469	2987	500	0.03	0.1	10.1
HU25	X	77	5186	4716	841	0.01	0.01	1.39	3466	3100	555	0.01	0.01	9.30
	Y		5231	5018	505	0.03	0.01	1.42	3507	3227	523	0	0.01	9.44
	Z		5095	4376	1274	0.01	0.01	1.36	3493	3071	613	0.01	0.02	9.30
HU26	X	77	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
	Y		5374	4791	924	0.01	0.01	1.46	3401	3123	370	0.01	0.02	9.31
	Z		5471	5066	691	0	0.01	1.44	3659	3452	291	0.01	0.02	9.62
HU27	X	87	5484	4443	1394	0.01	0.02	1.52	3441	2832	682	0.02	0.03	9.54
	Y		5448	4536	1308	0.02	0.01	1.48	3360	2820	634	0.01	0.02	9.23
	Z		5503	3711	1949	0.03	0.03	1.53	3353	2790	600	0.02	0.03	9.32
HU29	X	77	5670	5466	281	0.02	0.02	1.56	3350	3264	107	0.02	0.04	9.21
	Y		5440	4748	987	0.02	0.02	1.46	3407	3406	1827	0.01	0	8.82
	Z		5398	2339	3108	0.07	0.09	1.47	3214	3090	144	0.02	0.04	8.78

The in-situ confining pressure; (MPa) was derived using Equation (6) in text. A, B, a, and b are the parameters of the curve-fit of Wepfer and Christensen (1991) [Eq. (7) in text]. The acoustic impedance at borehole conditions \(\left( \text {Pa s/m}\right)\) for compressional- (\(-\!\!\!\!Z\)\(_{\text{ p }}\)) and shear-waves (\(-\!\!\!\!Z\)\(_{\text{ s }}\)) was calculated by the multiplication of seismic velocities and grain densities (Table 2)
NA Not available
a Lithostatic pressure for the sample BEX was considered as for a depth of 2630 m

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