Geochemistry of Formation Water and Implications for Ultradeep Tight Sandstone of DK Gas Field in Kuqa Depression

Table 2

The trace element concentrations, stable isotopes of Sr, H, and O of different type formation water samples analyzed.

Sample ID	Type	Mn (mg/L)	B (mg/L)	Ba (mg/L)	Rb (mg/L)	Sr (mg/L)	^87Sr/^86Sr	δ^2H	δ^18O
K-1	Condensate water	0.6	2.1	2.0	0.1	5.0
K-2		0.1	1.4	0.0	0.5	0.2
K-3		0.2	4.0	0.0	0.4	1.6	0.7109	-68.5	-6.7
K-4		0.1	1.3	0.0	0.1	0.3	0.7115	-64.3	-6.9
K-5		0.9	2.8	3.8	0.1	1.6	0.7123	-65.1	-7.1
K-6		2.8	3.1	0.9	0.3	6.1
K-7		0.7	4.5	0.1	0.1	1.6	0.7129	-45.9	-4.5
K-8		0.8	7.4	0.1	0.1	1.8	0.7121	-45.2	-3.8
K-9		0.4	7.2	0.4	0.0	0.1
K-10	Mixed water	1.1	3.6	2.0	0.3	14.9
K-11		2.9	4.8	0.9	0.8	36.4	0.7119	-74.3	-8.4
K-12		2.1	3.6	0.8	0.5	15.4	0.7121	-64.9	-7.4
K-13		1.3	4.6	0.3	0.5	17.5	0.7117	-68.0	-6.3
K-14		21.3	8.2	5.8	2.2	94.1	0.7118	-67.0	-9.7
K-15		0.3	8.8	0.1	1.3	7.8	0.7105	-69.4	-6.8
K-16	Isolated formation water	9.6	25.4	2.6	7.2	326.6
K-17		14.9	29.2	2.4	8.4	430.3	0.7122	-64.3	-7.2
K-18		14.7	13.6	4.7	7.3	510.8
K-19		16.3	17.9	2.6	8.6	561.2	0.7110	-64.9	-6.6
K-20		86.7	28.0	1.7	9.4	418.9	0.7120	-61.4	-7.3
K-21		71.7	17.0	2.5	6.5	363.0	0.7129	-55.7	-4.3
K-22	Transition zone water	3.8	59.6	2.2	4.4	331.2
K-23		63.7	24.4	2.5	6.3	285.2	0.7104	-66.2	-6.3
K-24		44.4	48.8	3.8	8.3	426.7	0.7120	-55.1	-5.8
K-25		14.1	42.5	3.3	9.2	464.3
K-26		194.5	21.5	16.0	8.4	330.5
K-27		17.3	42.0	7.2	4.0	146.5	0.7128	-52.8	-4.8
K-28		404.6	54.8	3.4	8.4	402.4	0.7104	-64.9	-6.4
K-29		25.6	32.7	9.5	8.7	377.6
K-30		8.0	39.1	5.1	8.2	414.8