Abstract:

Based on the analysis of the natural gas occurrence features, component features, types and sources, this article shows
the contribution of source rock of the Carboniferous and Jiamuhe Formation of the Lower Permian to the gas reservoir and points
out that future research should be strengthened to the source rock geology, geochemistry characteristics, and gas-generating
potential. To natural gas, there is not only dissolved gas in oil pools but also pure gas in gas pools. The dissolved gases distribute
in both the Permian system and the Mesozoic, and were derived from the Fengcheng Formation source rocks. They migrate and
accumulate with crude oil and are oil-type gases. The natural gases in gas pools distribute chiefly in the Jiamuhe Formation and
the Upper Wuerhe Formation which overlays the Jiamuhe Formation in Wuba Area, were derived from the highly mature Jiamuhe
Formation source rock and migrated, accumulated in gaseous phase, and they are coal type gas. The Jiamuhe Formation source
rocks have an important controling role in gas pools in the Jiamuhe Formation and the strata overlying the Jiamuhe Formation. The
Carboniferous source rocks have contribution to coal-type gas in depth. There is certain natural gas exploration potential in the
structural downdip part of the discovered gas pools and deeper parts which will be the next main exploration target.

Key words: natural gas, source rock, Carboniferous;Jiamuhe formation, Junggar Basin