Pore connectivity and tracer migration of typical shales in south China

摘要: Abstract Pore connectivity of shale is a critical factor in gas migration and production. In order to investigate the pore from three typical formations south China (Longmaxi, Niutitang, Longtan shales), we conducted complementary analyses with field emission-scanning electron microscopy (FE-SEM), mercury intrusion capillary pressure (MICP), (CO 2 N ) sorption isotherm, contact angle, spontaneous imbibition, as well saturated diffusion tracer distribution mapped laser ablation-inductively coupled plasma-mass spectrometry. The use water n-decane fluids enables us examine hydrophilic hydrophobic networks shale, resultant imbibition slopes demonstrate that Longmaxi has high its high-development both well-connected organic inorganic pores. Limited distances associated tortuosity (from MICP analyses) are consistent predominant presence nano-sized throats (3–50 nm) isotherm tests. types, development degree, connection directly supported by FE-SEM-imaging. Overall, variable limited samples will affect hydrocarbon preservation recovery.