Key points:
-Syria has almost won terrorists.
-The country is mostly controlled by the Syrian Arab Army(government) in the center,west and south and the Syrian Democratic Forces(Kurds+"FSA" leftovers) northeast and the eastern part of the eufrates.
-Small turkish presence in Homs province(not related)
-Whoever controls oil will have more power at the peace negotiation table.
Soon to come:
We will see fights along the Syrian-Iraqi border specially in the eastern Eufrates and Raqqa province as we have seen now in Deir ErZoz, lets hope that Russian influence on both parties will avoid conflict and that the agreements reached do not violate Syrian territorial integrity since that would be a self-shot in the foot for reconstruction, geostrategic influence and policy shapping dominance.
Conclusion: Dividing Syria would benefit NATO/Israeli/Saudi position of avoiding a Shia commercial,political and economic axis from Beirut to Teheran that would counter balance the Wahabi-Zionist alliance so it is important for the Syrian Government who in this ideological battle is on the side of tolerance and religious coexistance to retain control of the oil fields.
More info(in spanish) here: http://annurtv.com/que-pasara-con-el-petroleo-sirio-tras-la-derrota-de-isis/