THE APPLICATION OF THE COMBINATION OF NMR LOGGING AND NMR MEASUREMENTS AT RSWC SAMPLES AT THE WELL SITE TO IDENTIFY PRODUCIBLE OIL IN TIGHT ROCKS

摘要

The process by which fluid is lost from a core during retrieval to the surface by hydrocarbon expansion in tight rocks mimics hydrocarbon production under depletion drive in these reservoirs. Therefore, a comparison of hydrocarbon saturation in situ with that of a core sample at standard conditions provides a measure of producible hydrocarbons in tight rocks. From the point of view of hydrocarbon recovery, the core plug can be considered as a reservoir depleted to 1 atm pressure. This of course cannot be achieved physically and hence the difference between the residual hydrocarbon saturation in the plug and that in situ should be regarded as an upper bound on producible hydrocarbon.