Sorry but it's totally different:
1) Glorietta seems to be an explosion linked to a methane gas accumulation in the basement linked to waste water decomposition,
2) Batasan seems to be an explosion of a gaz bottle (LPG?) linked with explosives remotely detonated.
There is "gas" in both but they are totally different, there's no methane in Batasan but surely LPG (Liquefied Petroleum Gas) which is very common in the Philippines (IE Shellane).