15 March 2017. Following the previous advances in the area of Palmyra (here and here), Syrian government forces secured the area of the Mustadira gas field southeast of the ancient city and launched an attack against the ISIS terrorist group in the direction of the Arak gas field.

SOUTH FRONT

https://southfront.org/syrian-troops-retake-control-mustadira-gas-field-develop-advance-arak-gas-field-map-update

At industryabout.com:

Mustadira Gas Field

Arak Gas Field

Syria - Industrial Map