The Evolution of Diagenetic Fluids and Accumulation Characteristics of Tight Sandstone Reservoir in Upper Paleozoic, Southwestern Ordos Basin

Table 4

Results of laser Raman analysis of liquid phase composition of Paleozoic inclusions in southwestern Ordos Basin (molar relative content %).

Well number	Sample number	Description	Depth(m)	Stratum/lithology	Gas phases%
					CO2	H2S	CH4	SO2	H2O	Cl2	O2	CO	F2	N2	H2	C2H2	C2H4	C2H6	C3H6	C3H8	C4H6	C6H6	Total
Qingtan 2 well	5-1	Late stage	4722.8	Shanxi formation/magenta medium-coarse quartz sandstone				0.04	99.96														100.0
	5-2	Early stage	4722.8						100.00														100.0
	29	Early stage	4728.1	Shanxi formation/gray-white medium-coarse quartz sandstone	0.07				99.93														100.0
	35-1	Early stage	4729.4	Shanxi formation/gray-white medium-coarse quartz sandstone	0.12				99.88														100.0
	35-2	Late stage	4729.4						100.00														100.0
	47	Late stage	4732.0	Shanxi formation/grayish-white gravel medium-coarse quartz sandstone			0.04		99.96														100.0
Lian 1 well	Li98-1	Early stage	3467.7	Shanxi formation/gray-black fine sandstone					100.00														100.0
	Li98-2	Late stage			0.07				99.93														100.0
	Li93-1	Late stage	3423.3	Shanxi formation/gray-white medium-fine-grained sandstone	2.03		1.37		96.60														100.0
	Li93-2	Late stage			Dark single gas phase																		100.0
Zitan 1 well	TZ1,116-2	Early stage	3736.2	Shihezi Group/gray-white fine sandstone					100.00														100.0
He 3 well	132-1	Late stage	4073.1	Shihezi Group/gray-white medium-fine lithic sandstone	0.17		0.02		99.80														100.0
	132-2	Early stage	4073.1		Dark single gas phase																		100.0
	138-1	Early stage	4081.7				0.06		99.94														100.0