A Laboratory Approach Considering Salinity to Investigate Archie’s Parameters in Deep Shale: A Case Study in Longmaxi Formation, Southern Sichuan

Table 3

Comparative analysis results of Archie’s parameters in different rocks [1, 3, 7, 26, 37, 49–59].

Lithology				Porosity
Sandstone	Pure sandstone (in Archie)	1	2	10~55%
	Unconsolidated sandstone	0.6	1.3
	Weak-cemented sandstone	0.7	1.9
	Medium-cemented sandstone	0.5	2.2
	Sandstone		1.6-2.3
Shaly sandstone		<1.5	2.28
Carbonate rock	Unconsolidated Shell limestone and dolomite	0.55	1.85
	Medium-tight coarse crystalline limestone and dolomite	0.6	2.5
	Tight fine crystalline limestone and dolomite	0.8	2.3
	Carbonate rock	1	2.5-5/2.3-3.0
Shale	Shale (relatively low values)	\	Gas shale reservoirs: 1.6-1.7; Oil shale reservoirs: <2	\
			Cauvery basin: 1.31-1.86	10%~33%
			Laboratory experiment: 1.6	9.7%~20.1%
	Shale (relatively high values)	\	Canning Basin: 2.9–3.6 (different salinity); 2.70 (reservoir stress)	7.9%~8.5%
			Eagle Ford: 2.2	2.1%
	Shale (in our paper)	1.47	LZ area: 1.26	1.0%~6.2%