Abstract: The disclosure relates to a method for analyzing earth samples of a geological formation, comprising: performing a Fourier Transform InfraRed (FTIR) spectrometry measurement on an earth sample collected in the formation by: Irradiating the sample with infrared energy Measuring a spectrum representative of the infrared energy absorbed by the earth sample, analyzing the measured spectrum and obtaining from the analyzed measured spectrum a reconstructed spectrum corresponding to a combination of a plurality of standard spectra representative of elements contained in the earth sample, based on the measured spectrum and on the reconstructed spectrum, detecting a tar layer in the geological formation.

Abstract: Oil-based mud cuttings are cleaned of drilling fluid and mud additives. After sorting and rinsing the cuttings with diesel, the cuttings are put in a syringe, which is repeatedly filled and emptied of diesel. The cuttings are then washed in the syringe with pentane. The cuttings are then crushed and exposed to a solvent a second time. Instead of placing the cuttings in the syringe, alternatively, the cuttings remain on a sieve and the syringe is used to spray the cuttings with diesel, followed by pentane.

Abstract: Oil-based mud cuttings are cleaned of drilling fluid and mud additives. After sorting and rinsing the cuttings with diesel, the cuttings are put in a syringe, which is repeatedly filled and emptied of diesel. The cuttings are then washed in the syringe with pentane. The cuttings are then crushed and exposed to a solvent a second time. Instead of placing the cuttings in the syringe, alternatively, the cuttings remain on a sieve and the syringe is used to spray the cuttings with diesel, followed by pentane.

Abstract: The disclosure relates to a method for analyzing earth samples of a geological formation, comprising: performing a Fourier Transform InfraRed (FTIR) spectrometry measurement on an earth sample collected in the formation by: Irradiating the sample with infrared energy Measuring a spectrum representative of the infrared energy absorbed by the earth sample, analyzing the measured spectrum and obtaining from the analyzed measured spectrum a reconstructed spectrum corresponding to a combination of a plurality of standard spectra representative of elements contained in the earth sample, based on the measured spectrum and on the reconstructed spectrum, detecting a tar layer in the geological formation.