I-Associated petroleum gas (APG), noma igesi ehlotshaniswayo, iwuhlobo lwegesi yemvelo etholakala nediphozithi ye-petroleum, encibilika kuwoyela noma “njengesivalo segesi” samahhala ngaphezu kukawoyela esizindeni. Igesi ingasetshenziswa ngezindlela eziningi ngemva kokucutshungulwa: ithengiswe futhi ifakwe kumanethiwekhi okusabalalisa igesi yemvelo, isetshenziselwe ukuphehla ugesi esizeni ngezinjini noma izinjini zomoya, iphinde ifakwe ukuze ilulame futhi isetshenziswe ekutholeni kabusha uwoyela othuthukisiwe, iguqulwe isuka kugesi. oketshezini olukhiqiza izinto zokubasa zokwenziwa, noma ezisetshenziswa njenge-feedstock embonini ye-petrochemical.