Evolution of electrical resistivity and NMR during early-stage maturation of an organic-rich chalk

This paper studies the changes in electrical resistivity of an organic-rich source rock chalk containing a Type-IIs kerogen during early-stage maturation kerogen. As bitumen is generated maturation, from water wet to complex mixed-wet pore system, with micritic space remaining while expelled into macro pores converts some oil wet. system results non-Archie behavior pronounced curvature I-S w curve. We find that this well fit by connectivity theory. The theory parameters are determined both on native state core and artificial laboratory pyrolysis which generates bitumen. NMR used distinguish brine micritic, water-wet spaces intergranular, spaces, observed may be independently estimated. Comparison between dielectric logs show match over calcareous section more than 300 m thick.