Method for detecting hydrocarbons by comparing NMR response at different depths of investigation

   
   

A method for detecting hydrocarbon-bearing zones in a formation penetrated by a wellbore includes acquiring at least two nuclear magnetic resonance measurements, each of the at least two nuclear magnetic resonance measurements acquired from a volume of investigation at a different radial depth from the wellbore; and determining whether the formation bears hydrocarbons by comparing the at least two nuclear magnetic resonance measurements. A method for detecting fines invasion in a formation surrounding a wellbore includes acquiring at least two nuclear magnetic resonance measurements, each of the at least two nuclear magnetic resonance measurements acquired from a volume of investigation at a different radial depth from the wellbore; and determining whether the fines invasion has occurred by comparing the at least two nuclear magnetic resonance measurements.

Un método para detectar zonas del hidrocarburo-cojinete en una formación penetrada por un pozo incluye adquirir por lo menos dos medidas de la resonancia magnética nuclear, cada uno de las por lo menos dos medidas de la resonancia magnética nuclear adquiridas de un volumen de investigación en una diversa profundidad radial del pozo; y determinándose si la formación lleva los hidrocarburos comparando las por lo menos dos medidas de la resonancia magnética nuclear. Un método para detectar la invasión de las multas en una formación que rodea un pozo incluye adquirir por lo menos dos medidas de la resonancia magnética nuclear, cada uno de las por lo menos dos medidas de la resonancia magnética nuclear adquiridas de un volumen de investigación en una diversa profundidad radial del pozo; y determinándose si la invasión de las multas ha ocurrido comparando las por lo menos dos medidas de la resonancia magnética nuclear.

 
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