Determination of representative elemental length based on subsurface formation data

A method for forming Representative Elemental Length (REL) of well data comprising:

• inputting log data from a borehole in a formation into an information handling system;
• identifying an initial length of a REL investigation section and divide the log data into a plurality of REL investigation sections that are of substantially equal length;
• fixing a center for each of the plurality of REL investigation sections;
• selecting a sub-segment for each center in the plurality of REL investigation sections;
• calculating an average value of a formation property for each sub-segment;
• checking the formation property is stable in the sub-segment, and when the formation property is stable for each of the plurality of REL investigation sections, each of the plurality of REL investigation sections become a REL section;
• deriving the formation property for each of the REL sections as an output;
• and
• forming a model of the formation based at least in part on the formation property of each of the REL sections.

A system comprising:

• a downhole device, wherein the downhole device is configured to be disposed in a borehole and to take a plurality of measurements of a formation;
• and
• an information handling system configured to:
• form log data from the plurality of measurements;
• identify an initial length of a Representative Elemental Length (REL) investigation section and divide the log data into a plurality of REL investigation sections that are of equal length;
• calculate an average value of a formation property for each of the plurality of REL investigation sections;
• select a maximum value and a minimum value of the plurality of REL investigation sections;
• check whether the maximum value and the minimum value are stable for each of the plurality of REL investigation sections, and when the maximum value and the minimum value are stable for each of the plurality of REL investigation sections, each of the plurality of REL investigation sections become a REL section;
• derive the formation property for each of the REL sections as an output;
• and
• form a model of the formation from each of the REL sections.