Associated petroleum gas (APG), ama gaaska la xidhiidha, waa nooc ka mid ah gaaska dabiiciga ah kaas oo laga helo kaydka batroolka, ama ku milmay saliidda ama sida "koofiga gaasta" ee bilaashka ah ee ka sarreeya saliidda kaydka. Gaaska waxaa loo isticmaali karaa dhowr siyaabood ka dib markii la farsameeyo: la iibiyo oo lagu daro shabakadaha qaybinta gaaska dabiiciga ah, oo loo isticmaalo korontada goobta ee matoorada ama marawaxadaha, dib u soo kabashada labaad oo loo isticmaalo soo kabashada saliidda, laga beddelay gaaska dareerayaasha soo saara shidaalka synthetic, ama loo isticmaalo sida quudinta warshadaha petrochemical.