A matrix acidizing monitoring system comprising: a tool string carrying a bottom hole assembly, the bottom hole assembly configured to conduct matrix acidizing in a wellbore; a sensor array operably associated with the bottom hole assembly and having first and second sets (34a, 34b) of sensors, each of the first and second sets (34a, 34b) of sensors being operable to detect a matrix acidizing operational parameter at a location in the wellbore; wherein the first and second sets (34a, 34b) of sensors are disposed axially spaced apart from one another upon the bottom hole assembly, the first set of sensors detecting the parameter at the location at a first time, and the second set of sensors detecting the parameter at the location at a second time when the bottom hole assembly is moved within the wellbore past the location at a particular speed from a first position to a second position; and a processing equipment configured to control the rate of movement of the tool string and bottom hole assembly such that the rate of movement of the tool string and bottom hole assembly is coordinated with the timing of detection, by the first and second sets (34a, 34b) of sensors, of the parameter at the location and such that the first set of sensors detects the parameter at the location at the first time and the second set of sensors detects the parameter at the location at the second time, the processing equipment further configured to receive signals from the sensors representative of the detected parameters and to compare the parameter detected by the first set of sensors to the parameter detected by the second set of sensors. a tool string carrying a bottom hole assembly, the bottom hole assembly configured to conduct matrix acidizing in a wellbore; a sensor array operably associated with the bottom hole assembly and having first and second sets (34a, 34b) of sensors, each of the first and second sets (34a, 34b) of sensors being operable to detect a matrix acidizing operational parameter at a location in the wellbore; wherein the first and second sets (34a, 34b) of sensors are disposed axially spaced apart from one another upon the bottom hole assembly, the first set of sensors detecting the parameter at the location at a first time, and the second set of sensors detecting the parameter at the location at a second time when the bottom hole assembly is moved within the wellbore past the location at a particular speed from a first position to a second position; and wherein the first and second sets (34a, 34b) of sensors are disposed axially spaced apart from one another upon the bottom hole assembly, the first set of sensors detecting the parameter at the location at a first time, and the second set of sensors detecting the parameter at the location at a second time when the bottom hole assembly is moved within the wellbore past the location at a particular speed from a first position to a second position; and a processing equipment configured to control the rate of movement of the tool string and bottom hole assembly such that the rate of movement of the tool string and bottom hole assembly is coordinated with the timing of detection, by the first and second sets (34a, 34b) of sensors, of the parameter at the location and such that the first set of sensors detects the parameter at the location at the first time and the second set of sensors detects the parameter at the location at the second time, the processing equipment further configured to receive signals from the sensors representative of the detected parameters and to compare the parameter detected by the first set of sensors to the parameter detected by the second set of sensors.