PanTerra and ENRES International have joined forces to form a new technical alliance. Through this tie up, PanTerra will market, sell and maintain CycloLog. A major part of CycloLog is a technology known as INPEFA®. In 2013 ENRES partnered with ARK CLS to develop INPEFA® plug-in for Petrel. Following PanTerra and ENRES technical alliance, ARK CLS have signed an agreement with PanTerra to ensure the continual development and maintenance of INPEFA® plug-in for Petrel. INPEFA®, a data driven method for well log correlation.