The present invention provides method for detecting the possible presence of surfaces layers of diagenetic origin by establishing divergence between well signatures such as logs, particularly for use in predominantly carbonate reservoirs. Free bandwidth is calculated by subtracting an already used band from the full band of the base station. Ultra-low field NMR systems are ideal for this purpose because they do not require large powerful magnets and because they can examine materials enclosed in conductive shells such as lead shells. Additionally, the approach includes generating a location-based notification based on the notification point, wherein the location-based notification is triggered when the user is within a predetermined proximity of the notification point. The delay circuit includes a buffer to store a bit pattern corresponding to a number of delay elements traversed in a partial clock cycle of the oscillator clock signal in response to the clock cycle of the clock signal based on outputs of the plurality of delay elements.