There are two sets of source rocks in Carboniferous in the Malang sag, namely upper Haerjiawu Formation and lower Haerjiawu Formation. And source control effect is obvious on reservoir formation in this area. It is found that the formation and distribution of different types of crude oil are strictly controlled by the distribution of the corresponding source rocks using the geochemical comparative analysis of the source rock and crude oil as well as the oilsource correlation. Our analysis indicates that the main controlling factor of hydrocarbon accumulation is the reasonable configurations of high quality source rock, strongly recharging of hydrocarbon into faults connecting source rock and reservoir, and favorable volcanic rock facies belt. There are two models of the carboniferous reservoir formation based on the configuration relations between the source rock and reservoir. One is weathering crusttype hydrocarbon accumulation model, in which oil and gas from the below source rock accumulate in the highquality reservoirs of carboniferous volcanic top which is transformed by weathering and leaching, and migration channels are faults connecting source rock and reservoir. The other is inner hydrocarbon accumulation model, in which the reservoir is reconstructed by fluid dissolution and the oil and gas are derived from the nearby carbonaceous mudstone deposited during the volcano eruption break.