Associated petroleum gas (APG), ma ọ bụ gas jikọtara ya, bụ ụdị gas sitere n'okike nke a na-ahụ na mmanụ mmanụ, agbazere na mmanụ ma ọ bụ dị ka "okpu gas" n'efu n'elu mmanụ dị na ọdọ mmiri. Enwere ike iji gas ahụ mee ihe n'ọtụtụ ụzọ mgbe nhazichara: rere ma tinye ya na netwọk nkesa ikuku gas, nke a na-eji maka ọkụ eletrik na saịtị na engines ma ọ bụ turbines, reinjected maka mgbake nke abụọ ma jiri ya mee ihe na mgbake mmanụ, gbanwere site na gas. na mmiri mmiri na-emepụta mmanụ ọkụ sịntetik, ma ọ bụ jiri dị ka nri nri maka ụlọ ọrụ petrochemical.