4 years ago

Insight into oil and gas-shales compounds signatures in low field 1H NMR and its application in porosity evaluation

Insight into oil and gas-shales compounds signatures in low field 1H NMR and its application in porosity evaluation
The low field 1H NMR characterization of rock components that are specific for oil- and gas- shales is presented. 1D T2 distributions together with T1-T2 maps and T1/T2 ratios for the samples of smectite, illite, illite-smectite, kaolinite, chlorite and kerogen served to obtain characteristic features. T1-T2 maps measured in three saturation states (native, saturated and dried) allowed the observation of different fractions of water such as water confined in interlayer spaces, filling pore spaces and hydroxyl groups from crystallographic lattice. Differential images are proposed for the evaluation of water distribution in the pore spaces and values of porosity, directly related to the fluid removed after the drying of the sample. Porosity values for exemplary shale samples, calculated for differential results are consistent with the porosity obtained using T2 cut-offs. The relations between cation exchange capacity and T2 log-mean values for the samples at different saturation states are also shown.

Publisher URL: www.sciencedirect.com/science

DOI: S1387181117303888

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