The well was drilled to a total depth of 12,276ft and has an average porosity of 21% in the primary CDO sandstone reservoir. Last year, Canacol also made the Lulo gas discovery. This was drilled ...

another process affecting sandstone reservoirs, has also been studied in relation to deformation bands. Research indicates that silicification can drastically reduce porosity and permeability in ...

While sandstones have normally 15-25% porosity and pore sizes of tens to hundreds of microns, shales are quite likely to have 2-15% porosity and pores only a hundredth the size of sandstone pores.