METHOD FOR POROSITY ESTIMATION OF A GEOLOGICAL FORMATION FROM A NMR RELAXATION SPECTRUM, ASSOCIATED DEVICE

The present disclosure concerns a method for porosity estimation of a geological formation implemented in a porosity estimation device. The method comprises, obtaining (110) data of an initial NMR relaxation spectrum of a rock sample taken from the geological formation and a measured porosity. The r...

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Bibliographische Detailangaben
Hauptverfasser:	BILLIOTE, Joel, AMMAR, Mahdi, BREVIERE, Jerome, BONDABOU, Karim
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES MEASURING MEASURING ELECTRIC VARIABLES MEASURING MAGNETIC VARIABLES PHYSICS TESTING
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Beschreibung
Zusammenfassung:	The present disclosure concerns a method for porosity estimation of a geological formation implemented in a porosity estimation device. The method comprises, obtaining (110) data of an initial NMR relaxation spectrum of a rock sample taken from the geological formation and a measured porosity. The rock sample includes cuttings and liquid.The method comprises decorrelating (120,130) a first contribution peak of free liquid and a second contribution peak in the NMR relaxation spectrum to obtain at least a second decorrelated NMR relaxation spectrum representative of pore's liquid disposed in intact pieces of rock of the cuttings.The method comprises determining (144) a NMR integration correction factor from a contribution of the pore's liquid in the rock sample calculated (142) based on the second decorrelated NMR relaxation spectrum.The method comprises estimating an estimated porosity from the measured porosity and the integration correction factor.