Fluid Inclusion Evidence for Oil Charge and Cracking in the Cambrian Longwangmiao Dolomite Reservoirs of the Central Sichuan Basin, China

Table 2

Measured Th and salinities (S) of fluid inclusions in the Longwangmiao Formation, Well MX20.

Well	Depth (m)	Host minerals	Cause of formation	Type	Th (°C)		Salinity (wt.%NaCl)		Type of synchronous hydrocarbon inclusions
					Range	Average	Range	Average
MX20	4597.29-4598.73	Dolomite in dissolution pore and cave	Primary	Aqueous inclusion	134.7-147.8	141.7	14.9	14.9	SB and gas
			Secondary	Aqueous inclusion	154.2	154.2	14.8	14.8	SB and gas
			Secondary	Aqueous inclusion	179.8-192.3	187.8	4.6-6.6	5.6	SB and gas
		Dolomite in vein	Primary	Aqueous inclusion	142.2-154.6	148.5	11.0	11.0	SB and gas
			Primary	Aqueous inclusion	163.1-165.1	164.1	6.6	6.6	SB and gas
		Quartz in vein	Primary	Aqueous inclusion	214.3	214.3	-	-	SB and gas
	4605.34-4605.59	Dolomite in dissolution pores	Primary	Aqueous inclusion	74.3	74.3	-	-	Oil
			Primary	Oil	65.1	65.1			Oil of blue-white fluorescence
			Primary	Aqueous inclusion	108.2-125.9	117.5	2.4-4.6	3.5	Oil
			Primary	Oil	85.7	85.7			Oil of blue fluorescence
	4607.25	Dolomite in dissolution pores	Primary	Aqueous inclusion	118.4-136.9	126.7	18.1-23.7	20.5	SB and gas
			Primary	Aqueous inclusion	142.2-154.2	148.2	13.1-21.5	17.8	SB and gas
		Dolomite in vein	Primary	Aqueous inclusion	123.5-137.3	131.5	18.7-21.5	19.7	SB and gas
	4618.64-4618.86	Dolomite in dissolution pores	Primary	Aqueous inclusion	127.5-135.6	131.8	15.2-15.8	15.5	SB and gas
			Primary	Aqueous inclusion	141.1-154.2	148.0	13.2-18.5	15.9	SB and gas
			Primary	Aqueous inclusion	177.6-184.9	181.3	11.0-11.5	11.2	SB and gas

-: means not detected. SB: means solid bitumen.