Complex sentence: The ESR is in use since time ago for the analysis of underground soils to determine it potential for crude oil production but this innovation not intended for exploration of new oil reserves but for what is called Production Logging.
Split into simpler sentences: The ESR is in use since time ago for the analysis of underground soils to determine it potential for crude oil production. The PL-ESR is not intended for exploration of new oil reserves but for Production Logging.