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

Table 1

The petrophysical meaning of Archie parameters.

Archie parameter		petrophysical meaning
	Tortuosity index	Describe the geometrical characterization of current flow path
	Cementation factor or porosity exponent	Model 1: pore space is composed of capillary tubes with identical cross-sectional area	Indicate pore channel tortuosity
		Model 2: pore space is subdivided into conductive channels and nonconductive traps	A relative partition between conductive and nonconductive parts
		Model 3: a more realistic system of pore bodies connected by pore throats	An effective area ratio of pore-throat to pore-body in logarithms
		expresses the degree of pore connectivity and consolidation
	Saturation exponent	was linked to many factors such as wettability, lithology, fluid properties, and pore structure