(EnergyAsia, March 20) — Exxon Mobil Corporation said that its subsidiaries Mobil Cepu Ltd. and Ampolex (Cepu) Pte Ltd have signed a Joint Operating Agreement (JOA) with PT Pertamina EP Cepu, a subsidiary of Indonesia’s state energy company Pertamina, for the Cepu contract area located in East and Central Java.   The signing of the…