Isolation and Characterization of Viscosity-Reducing and Biosurfactant-Producing Bacteria in Low-Permeability Reservoir

Table 1

The geological and geochemical factors of Zhuanjing and 154 blocks in Hujianshan oilfield.

Factors	Zhuanjing block	154 block
Lithological characteristics	Sandstone	Sandstone
Initial temperature (°C)	67.8	67.5
Salinity (g/L)	46.01	37.48
Average porosity (%)	12.79	12.54
Average permeability (mD)	1.2	3.6
pH	6	6
Groundwater type	CaCl2	CaCl2
Depth (m)	2143	2160

This is the well temperature before water flooding. The current temperature of the oil well is about 40-50°C.