甲烷是最丰富的天然气,主要通过微生物对有机化合物的吸收（微生物成因）和对有机物的热分解（生热成因）而形成。虽然对地球深处地幔甲烷的生成仍有争论,但根据从贫沉积物的洋中脊流出的高温流体、具陆地超铁镁岩区域的渗流、前寒武纪地盾的流体以及地幔和火成岩的流体包裹体 Methane is the most abundant natural gas and is mainly formed by microbial absorption of organic compounds (microbial genesis) and thermal decomposition of organic matter (genesis of thermogenesis). Although there is still debate about the formation of methane in the deep mantle of the Earth, based on the high-temperature fluids exiting the mid-ocean ridge of lean sediments, seepage through the terrestrial ultra-ferrimagite zone, fluids from the Precambrian shield and mantle and igneous rocks Fluid inclusions