Abstract
Production of oil and gas from unconventional source rock reservoirs has surged in recent years in the United States, which led to a massive increase in exploration activities globally. The complexity in the rock matrix lithology, pore fluids, and nanoscale pore sizes and permeability make the evaluation of unconventional reservoirs extremely challenging. Nuclear magnetic resonance (NMR) has emerged as a key technology to evaluate and measure porosity, hydrocarbon-in-place, fluid properties, saturation, and productivity in unconventional reservoirs. This chapter first introduces the basic NMR physics and NMR measurement concepts for formation rocks. It then presents an NMR downhole application example for the measurement of total porosity and partial porosity in organic matter of an unconventional source rock gas reservoir. Lastly, it introduces two newly developed NMR technologies that extend the NMR measurement capability to long whole cores and drill cuttings in unconventional source rocks in the laboratory.
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