Inyathelo loku-1: Ukucoca igesi-Igesi ekhutshiweyo yegesi okanye irhasi enxulumene negesi okanye i-oyile ye-oyile ikhuliswa ukucoca usebenzisa ubuchwephesha bokuziqhelanisa. Ukungcola kususwe ngokupheleleyo ngeli nqanaba, ukushiya umxube we-hydrocarbon (i-methane, ethane, propane, njalo njalo).