US 11,668,664 B2
Detection of solid organic material and fluids in a shale rock by means of low field NMR
Rodolfo Hector Acosta, Córdoba (AR); Emilia Victoria Silletta, Córdoba (AR); Gustavo Alberto Monti, Córdoba (AR); Yamila Garro Linck, Alta Gracia (AR); Paula Cecilia Bedini, Hudson (AR); Gabriela Soledad Vila, La Plata (AR); Diana María Masiero, Ranelagh (AR); Esteban Alejo Domené, Ciudad Autónoma de Buenos Aires (AR); and Manuel Isaac Velasco, Córdoba (AR)
Assigned to YPF TECNOLOGIA S.A., Ciudad Autonoma de Buenos Aires (AR); CONSEJO NACIONAL DE INVESTIGACIONES CIENTIFICAS Y TECNICAS (CONICET), Ciudad Autonoma de Buenos Aires (AR); and UNIVERSIDAD NACIONAL DE CORDOBA, Ciudad de Cordoba/Prov. de Cordoba (AR)
Filed by YPF TECNOLOGÍA S.A., Ciudad Autónoma de Buenos Aires (AR); CONSEJO NACIONAL DE INVESTIGACIONES CIENTÍFICAS Y TÉCNICAS (CONICET), Ciudad Autónoma de Buenos Aires (AR); and UNIVERSIDAD NACIONAL DE CÓRDOBA, Ciudad de Córdoba (AR)
Filed on Oct. 27, 2020, as Appl. No. 17/81,561.
Claims priority of provisional application 62/927,383, filed on Oct. 29, 2019.
Prior Publication US 2021/0123874 A1, Apr. 29, 2021
Int. Cl. G01N 24/08 (2006.01); G01R 33/50 (2006.01); G01V 3/32 (2006.01)
CPC G01N 24/081 (2013.01) [G01R 33/50 (2013.01); G01V 3/32 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A method for detection of solid organic matter and fluids in a geological formation sample by means of low field NMR (Nuclear Magnetic Resonance) in a single measurement, the method comprising the steps of:
i. providing a rock sample;
ii. submitting the sample to a 2D Nuclear Magnetic Resonance (NMR) assay comprising the application of a 2D pulse sequence with a saturation-recovery, or inversion-recovery, in an indirect dimension and a FID-CPMG in a direct dimension;
iii. obtaining a 2D T1-T2 map from the NMR assay;
iv. determining relaxation times;
v. assigning solid organic matter and fluid contributions based on the relaxation times, wherein solid organic matter is assigned transverse relaxation times shorter than approximately 200 microseconds;
vi. quantifying the amount of 1H nuclei in predefined regions in the 2D map by using a pre-calibration of an equipment response.