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SPWLA Distinguished Speaker Series. The quantity of light hydrocarbon and natural gas in tight-oil and gas shales respectively is one of the primary indicators of reservoir quality (RQ). The measurement of RQ therefore depends on the ability to distinguish the quantity of the light oil or gas from other fractions of the total organic carbon, namely the immobile hydrocarbons such as kerogen, bitumen, heavy oil and formation water. Additionally, the separation of the oil into fractions hosted in organic versus inorganic porosity is important for determining the potentially producible fraction. Although multidimensional diffusion-relaxation correlation experiments can distinguish hydrocarbons from other fluids in conventional reservoirs, their use is restricted owing to the presence of short relaxation times in most tight oil and gas shale plays. The feasibility of nuclear magnetic resonance (NMR) relaxometry for determining the different constituents in shale based on the frequency dependence of their relaxation times is elaborated in this course. Two-dimensional NMR T1-T2 experiments take advantage of this frequency dependence to provide a robust method for the clear identification of the different fractions.
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