Formation of phyllosilicates in a fault zone affecting deeply buried arkosic sandstones: their influence on petrophysic properties (Annot sandstones, French external Alps)

Swiss Journal of Geosciences

Table 2 Results of petrophysical measurements

Samples	Orientation	Positions (m)	K (mD)	Delta K (mD)	Nt (%)
RT01	N170	−17.16	0.036	0.002	1.80
RT01	V	−17.16	0.032	0.002	1.82
RT04	N170	−16.42	ND	ND	1.66
RT04	N170	−16.42	0.064	0.004	2.21
RT04	N80	−16.42	0.04	0.002	1.45
RT04	V	−16.42	0.036	0.002	1.38
RT04	V	−16.42	0.031	0.002	1.29
RT05	N170	−15.78	0.052	0.003	1.51
RT05	N80	−15.78	0.036	0.002	1.41
RT05	V	−15.78	0.04	0.002	1.39
RT07	N80	−12.62	0.037	0.002	1.85
RT07	N170	−12.62	0.035	0.002	3.03
RT07	N170	−12.62	ND	ND	2.19
RT07	V	−12.62	0.03	0.002	1.92
RT07	V	−12.62	0.038	0.002	2.55
RT08	N170	−4.07	0.048	0.003	3.51
RT08	V	−4.07	0.076	0.004	3.58
RT08	N80	−4.07	0.035	0.002	3.82
RT09	N170	−1.0	0.109	0.007	3.59
RT09	N80	−1.0	0.043	0.002	3.51
RT10	V	−0.5	ND	ND	1.88
RT10	V	−0.5	ND	ND	2.51
RT10	V	−0.5	ND	ND	3.54
RT15	N170	0.0	0.43	0.028	3.37
RT15	N80	0.0	0.621	0.039	3.64
RT15	V	0.0	0.252	0.016	2.75
RT15	V	0.0	ND	ND	2.67
RT15	V	0.0	ND	ND	3.17
RT12	N170	0.46	ND	ND	2.77
RT12	N80	0.46	1.132	0.073	2.39
RT12	N80	0.46	0.99	0.063	4.11
RT12	N80	0.46	ND	ND	3.02
RT12	N80	0.46	ND	ND	3.15
RT12	N80	0.46	ND	ND	2.37
RT12	V	0.46	0.344	0.022	2.22
RT12	V	0.46	0.227	0.015	2.52
RT12	V	0.46	0.135	0.009	2.69
RT16	N170	1.0	0.299	0.019	2.97
RT16	N80	1.0	0.161	0.01	2.45
RT16	V	1.0	0.217	0.013	2.87
RT22	N170	12.54	0.065	0.004	3.41
RT22	N170	12.54	0.073	0.004	3.78
RT22	N80	12.54	0.094	0.005	4.32
RT22	V	12.54	0.111	0.007	3.66
RT21	N170	16.0	0.069	0.004	1.59
RT21	N80	16.0	0.213	0.013	1.81
RT21	V	16.0	0.09	0.005	1.62

The orientation N170 refers to horizontal cores drilled parallel to the fault, N80 refers to horizontal cores drilled perpendicular to the fault and V refers to vertical cores. The positions of the sample are given following a reference point located in the fault core-zone and with positive values for samples located in the footwall. K(mD) corresponds to the permeability values and Nt corresponds to the total porosity values
ND non-determined