Cheiron Holdings, through CÃ¡rdenas-Mora Oil Co., has reportedly signed for operatorship and 50% in the CNH-A3-CÃ¡rdenas-Mora/2017 block, offered in the 4 Oct â17 farm-out round. The 168-sq km block lies onshore Sureste Basin, near Villahermosa in Tabasco. 
Dea will take a 50%+op. share in the CNH-A4-Ogarrio/2017 block (Ogarrio oilfield), and Egypt's Cheiron Holdings operatorship and 50% in the CNH-A3-CÃ¡rdenas-Mora/2017 block.