Logging evaluation of ultra-low porosity and super-low permeability reservoirs in Silurian, middle Tarim Basin

The Silurian reservoirs in Shuntuoguole area of the middle Tarim Basin are featured by ultra-low porosity and super-low permeability. Based on conventional logging, NMR logging and core data, the logging responses and micro features of reservoirs were analyzed. The features of oil and water beds as well as the properties of fluids were identified. The oil/water interfaces were evaluated. The studies provided technical supports for the fine description and exploration of reservoirs with ultra-low porosity and super-low permeability.