Associated petrol gas (APG), ma ọ bụ gas jikọtara, bụ ụdị gas nkịtị nke a hụrụ na nkwụnye ego nke mmanụ ala, ma gbazee na mmanụ ma ọ bụ dịka "okpu gas" n'efu na mmanụ ahụ. Enwere ike iji gas rụọ ọrụ n'ọtụtụ ụzọ mgbe emechara ya: rere ma sonye na netwọkụ gas na-ekesa, ejiri maka igwe eletrik na saịtị yana injin ma ọ bụ turbines, weghachi maka mgbake nke abụọ ma jiri ya mee ka mgbake mmanụ dịwanye elu, gbanwere site na gas na mmiri mmiri na-emepụta mmanụ ọkụ sịntetik, ma ọ bụ jiri ya mee ihe maka ụlọ ọrụ petrochemical.