Method for determining acidization effectiveness for wellbore operations

A method of determining an effectiveness of acidizing a geological formation, the method comprising:

• recording a first nuclear magnetic resonance (NMR) spectrum of the geological formation over a micro-pore relaxation range, a meso-pore relaxation range, and a macro-pore relaxation range;
• calculating a first interconnectivity number by dividing a first micro-meso interconnectivity number to a first meso-macro interconnectivity number, wherein the first micro-meso interconnectivity number is a ratio of an intensity of the first NMR spectrum at a micro-meso diffusional coupling to a peak intensity of the first NMR spectrum in the micro-pore relaxation range or the meso-pore relaxation range, and the first meso-macro interconnectivity number is a ratio of an intensity of the first NMR spectrum at a meso-macro diffusional coupling to a peak intensity of the first NMR spectrum in the meso-pore relaxation range or the macro-pore relaxation range;
• acidizing the geological formation by delivering a stimulation fluid to the wellbore, thereby forming an acidized geological formation, wherein the acidizing includes injecting the stimulation fluid into the geological formation at a pressure of 100 psi to no more than 5,000 psi;
• recording a second NMR spectrum of the acidized geological formation over the micro-pore relaxation range, the meso-pore relaxation range, and the macro-pore relaxation range;
• calculating a second interconnectivity number by dividing a second micro-meso interconnectivity number to a second meso-macro interconnectivity number, wherein the second micro-meso interconnectivity number is a ratio of an intensity of the second NMR spectrum at a micro-meso diffusional coupling to a peak intensity of the second NMR spectrum in the micro-pore relaxation range or the meso-pore relaxation range, and the second meso-macro interconnectivity number is a ratio of an intensity of the second NMR spectrum at a meso-macro diffusional coupling to a peak intensity of the second NMR spectrum in the meso-pore relaxation range or the macro-pore relaxation range;
• and
• comparing the first interconnectivity number with the second interconnectivity number to determine the effectiveness of acidizing the geological formation.