Strontium Isotope Geochemistry of Ordovician Paleokarst Reservoirs in Huanghua Depression

doi:10.19657/j.geoscience.1000-8527.2020.04.17

Abstract

Abstract:

To study the strontium (Sr) isotopic characteristics of paleokarst reservoirs, the origin of Sr isotope in Ordovician karst reservoirs in Huanghua depression was discussed via isotopic experiments and comparison with the global Sr isotope background. Isotopic differences between the southern and northern parts of the Huanghua Depression were analyzed. The results show that the ⁸⁷Sr/⁸⁶Sr variation range of the Ordovician strata in the Huanghua depression is wider than that of the global Ordovician sedimentation, but their ⁸⁷Sr/⁸⁶Sr variation trends are similar. The Ordovician primitive carbonate strata have undergone late paleokarstification and fluid transformation, and the paleo-continental ⁸⁷Sr-rich fluids were used for various types of karst and filling. The dolomite ⁸⁷Sr/⁸⁶Sr values are distinctly higher than those of the limestone in the same horizon, suggesting that the dolomite captures ⁸⁷Sr more readily than the limestone. Duration of supergene karstification in the northern Huanghua depression is much longer than that in the southern part. The karstification intensity of the former is also higher, and its ⁸⁷Sr-rich fluid displacement stronger, which probably generates the higher ⁸⁷Sr/⁸⁶Sr values in the northern part of Huanghua depression.

Key words: strontium isotope, karstification, reservoir, Huanghua depression, geochemistry, Ordovician

CLC Number:

TE122.2

ZHANG Jinning, ZHOU Jiansheng, FU Lixin, LI Hongjun, LOU Da. Strontium Isotope Geochemistry of Ordovician Paleokarst Reservoirs in Huanghua Depression[J]. Geoscience, 2020, 34(04): 821-827.

Figures/Tables 7

References 23

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井号	层位	岩性	⁸⁷Sr/⁸⁶Sr	误差(2σ)	井号	层位	岩性	⁸⁷Sr/⁸⁶Sr	误差(2σ)
BS6	Of	灰岩	0.708 64	±0.000 01	KG8	Of	灰岩	0.708 64	±0.000 01
BS6	Of	白云岩	0.709 00	±0.000 09	KG8	Of	灰岩	0.709 87	±0.000 03
BS6	Of	白云岩	0.709 06	±0.000 01	K19	Of	灰岩	0.708 59	±0.000 08
BS701	Ox	灰岩	0.709 57	±0.000 03	K19	Of	灰岩	0.708 60	±0.000 06
BS701	Ox	灰岩	0.709 12	±0.000 01	K19	Of	灰岩	0.709 45	±0.000 01
BS701	Ox	白云岩	0.709 51	±0.000 02	K19	Of	白云岩	0.709 65	±0.000 06
BS701	Ox	白云岩	0.709 88	±0.000 06	K19	Of	白云岩	0.709 43	±0.000 03
BS701	Ox	白云岩	0.709 55	±0.000 01	K19	Of	白云岩	0.709 32	±0.000 03
BS701	Ox	白云岩	0.709 77	±0.000 02	K19	Of	白云岩	0.709 33	±0.000 04
BS701	Ox	灰岩	0.709 7	±0.000 06	K19	Of	灰岩	0.709 25	±0.000 02
BS701	Ox	白云岩	0.709 71	±0.000 02	K24	Of	白云岩	0.710 42	±0.000 03
BS701	Ox	灰岩	0.709 37	±0.000 01	K24	Of	灰岩	0.708 52	±0.000 02
BS701	Ol	白云岩	0.709 51	±0.000 04	K24	Of	灰岩	0.709 34	±0.000 04
BS701	Ol	白云岩	0.709 42	±0.000 05	K24	Of	灰岩	0.709 43	±0.000 04
BS701	Ol	白云岩	0.709 79	±0.000 05	K24	Of	白云岩	0.709 33	±0.000 05
BG1	Ox	灰岩	0.709 09	±0.000 03	LG1	Of	灰岩	0.710 83	±0.000 01
BG1	Ox	白云岩	0.709 27	±0.000 07	LG1	Of	灰岩	0.709 16	±0.000 03
CC1	Of	灰岩	0.708 39	±0.000 01	YG1	Ox	灰岩	0.709 23	±0.000 04
CC1	Of	灰岩	0.708 91	±0.000 02	T12	Of	灰岩	0.708 87	±0.000 03
CC1	Ox	灰岩	0.708 75	±0.000 03	T13	Of	灰岩	0.710 02	±0.000 04
CG1	Of	灰岩	0.708 91	±0.000 07	T13	Of	白云岩	0.709 54	±0.000 03
CH1	Of	灰岩	0.708 9	±0.000 08	T14	Of	灰岩	0.709 33	±0.000 05
CH1	Os	灰岩	0.709 28	±0.000 03	T14	Of	白云岩	0.709 92	±0.000 02
CH1	Os	白云岩	0.709 33	±0.000 07	T15	Of	灰岩	0.709 34	±0.000 03
CH1	Os	灰岩	0.709 46	±0.000 06	T4	Of	灰岩	0.709 88	±0.000 02
CH1	Of	白云岩	0.709 14	±0.000 08	WG1	Of	灰岩	0.709 26	±0.000 02
G2035	Ol	灰岩	0.709 77	±0.000 06	WG1	Of	灰岩	0.710 13	±0.000 01
G2035	Ol	灰岩	0.709 37	±0.000 05	WG1	Of	白云岩	0.710 81	±0.000 03
G2035	Ol	灰岩	0.709 53	±0.000 04	X12	Of	白云岩	0.709 98	±0.000 02
GG4-1	Of	灰岩	0.709 33	±0.000 04	X12	Of	白云岩	0.709 80	±0.000 06
KG1	Of	白云岩	0.709 13	±0.000 07	X12	Of	白云岩	0.709 40	±0.000 04
KG7	Os	白云岩	0.709 81	±0.000 02	X12	Of	灰岩	0.708 94	±0.00001
KG7	Os	白云岩	0.709 61	±0.000 03	X12	Of	白云岩	0.710 38	±0.000 03
KG7	Os	白云岩	0.709 25	±0.000 02	X14	Of	灰岩	0.708 76	±0.000 01
KG7	Os	灰岩	0.709 36	±0.000 05	X14	Of	灰岩	0.708 88	±0.000 04
KG7	Os	灰岩	0.709 45	±0.000 06	X14	Of	灰岩	0.709 14	±0.000 02
ZG2	Os	灰岩	0.708 94	±0.000 06	X7	Of	灰岩	0.709 58	±0.000 02
ZG2	Os	白云岩	0.709 30	±0.000 01	X7	Of	白云岩	0.709 44	±0.000 03
X13	Of	白云岩	0.708 48	±0.000 05	QG1	Of	白云岩	0.708 93	±0.000 04
X13	Of	白云岩	0.708 84	±0.000 06	QG1	Of	白云岩	0.709 01	±0.000 04
X13	Of	白云岩	0.708 98	±0.000 03	QG1	Of	灰岩	0.709 30	±0.000 03
X13	Of	灰岩	0.708 57	±0.000 06

井号	层位	岩性	⁸⁷Sr/⁸⁶Sr	误差(2σ)	井号	层位	岩性	⁸⁷Sr/⁸⁶Sr	误差(2σ)
BS6	Of	灰岩	0.708 64	±0.000 01	KG8	Of	灰岩	0.708 64	±0.000 01
BS6	Of	白云岩	0.709 00	±0.000 09	KG8	Of	灰岩	0.709 87	±0.000 03
BS6	Of	白云岩	0.709 06	±0.000 01	K19	Of	灰岩	0.708 59	±0.000 08
BS701	Ox	灰岩	0.709 57	±0.000 03	K19	Of	灰岩	0.708 60	±0.000 06
BS701	Ox	灰岩	0.709 12	±0.000 01	K19	Of	灰岩	0.709 45	±0.000 01
BS701	Ox	白云岩	0.709 51	±0.000 02	K19	Of	白云岩	0.709 65	±0.000 06
BS701	Ox	白云岩	0.709 88	±0.000 06	K19	Of	白云岩	0.709 43	±0.000 03
BS701	Ox	白云岩	0.709 55	±0.000 01	K19	Of	白云岩	0.709 32	±0.000 03
BS701	Ox	白云岩	0.709 77	±0.000 02	K19	Of	白云岩	0.709 33	±0.000 04
BS701	Ox	灰岩	0.709 7	±0.000 06	K19	Of	灰岩	0.709 25	±0.000 02
BS701	Ox	白云岩	0.709 71	±0.000 02	K24	Of	白云岩	0.710 42	±0.000 03
BS701	Ox	灰岩	0.709 37	±0.000 01	K24	Of	灰岩	0.708 52	±0.000 02
BS701	Ol	白云岩	0.709 51	±0.000 04	K24	Of	灰岩	0.709 34	±0.000 04
BS701	Ol	白云岩	0.709 42	±0.000 05	K24	Of	灰岩	0.709 43	±0.000 04
BS701	Ol	白云岩	0.709 79	±0.000 05	K24	Of	白云岩	0.709 33	±0.000 05
BG1	Ox	灰岩	0.709 09	±0.000 03	LG1	Of	灰岩	0.710 83	±0.000 01
BG1	Ox	白云岩	0.709 27	±0.000 07	LG1	Of	灰岩	0.709 16	±0.000 03
CC1	Of	灰岩	0.708 39	±0.000 01	YG1	Ox	灰岩	0.709 23	±0.000 04
CC1	Of	灰岩	0.708 91	±0.000 02	T12	Of	灰岩	0.708 87	±0.000 03
CC1	Ox	灰岩	0.708 75	±0.000 03	T13	Of	灰岩	0.710 02	±0.000 04
CG1	Of	灰岩	0.708 91	±0.000 07	T13	Of	白云岩	0.709 54	±0.000 03
CH1	Of	灰岩	0.708 9	±0.000 08	T14	Of	灰岩	0.709 33	±0.000 05
CH1	Os	灰岩	0.709 28	±0.000 03	T14	Of	白云岩	0.709 92	±0.000 02
CH1	Os	白云岩	0.709 33	±0.000 07	T15	Of	灰岩	0.709 34	±0.000 03
CH1	Os	灰岩	0.709 46	±0.000 06	T4	Of	灰岩	0.709 88	±0.000 02
CH1	Of	白云岩	0.709 14	±0.000 08	WG1	Of	灰岩	0.709 26	±0.000 02
G2035	Ol	灰岩	0.709 77	±0.000 06	WG1	Of	灰岩	0.710 13	±0.000 01
G2035	Ol	灰岩	0.709 37	±0.000 05	WG1	Of	白云岩	0.710 81	±0.000 03
G2035	Ol	灰岩	0.709 53	±0.000 04	X12	Of	白云岩	0.709 98	±0.000 02
GG4-1	Of	灰岩	0.709 33	±0.000 04	X12	Of	白云岩	0.709 80	±0.000 06
KG1	Of	白云岩	0.709 13	±0.000 07	X12	Of	白云岩	0.709 40	±0.000 04
KG7	Os	白云岩	0.709 81	±0.000 02	X12	Of	灰岩	0.708 94	±0.00001
KG7	Os	白云岩	0.709 61	±0.000 03	X12	Of	白云岩	0.710 38	±0.000 03
KG7	Os	白云岩	0.709 25	±0.000 02	X14	Of	灰岩	0.708 76	±0.000 01
KG7	Os	灰岩	0.709 36	±0.000 05	X14	Of	灰岩	0.708 88	±0.000 04
KG7	Os	灰岩	0.709 45	±0.000 06	X14	Of	灰岩	0.709 14	±0.000 02
ZG2	Os	灰岩	0.708 94	±0.000 06	X7	Of	灰岩	0.709 58	±0.000 02
ZG2	Os	白云岩	0.709 30	±0.000 01	X7	Of	白云岩	0.709 44	±0.000 03
X13	Of	白云岩	0.708 48	±0.000 05	QG1	Of	白云岩	0.708 93	±0.000 04
X13	Of	白云岩	0.708 84	±0.000 06	QG1	Of	白云岩	0.709 01	±0.000 04
X13	Of	白云岩	0.708 98	±0.000 03	QG1	Of	灰岩	0.709 30	±0.000 03
X13	Of	灰岩	0.708 57	±0.000 06

层位	岩性	⁸⁷Sr/⁸⁶Sr范围	⁸⁷Sr/⁸⁶Sr平均值
峰峰组	灰岩	0.708 39~0.710 83	0.709 21
峰峰组	白云岩	0.708 48~0.710 81	0.709 46
上马家沟组	灰岩	0.708 94~0.709 46	0.709 27
上马家沟组	白云岩	0.709 25~0.710 98	0.709 48
下马家沟组	灰岩	0.708 75~0.709 70	0.709 26
下马家沟组	白云岩	0.709 27~0.709 88	0.709 61
亮甲山组	灰岩	0.709 37~0.709 77	0.709 56
亮甲山组	白云岩	0.709 42~0.709 79	0.709 59

层位	岩性	⁸⁷Sr/⁸⁶Sr范围	⁸⁷Sr/⁸⁶Sr平均值
峰峰组	灰岩	0.708 39~0.710 83	0.709 21
峰峰组	白云岩	0.708 48~0.710 81	0.709 46
上马家沟组	灰岩	0.708 94~0.709 46	0.709 27
上马家沟组	白云岩	0.709 25~0.710 98	0.709 48
下马家沟组	灰岩	0.708 75~0.709 70	0.709 26
下马家沟组	白云岩	0.709 27~0.709 88	0.709 61
亮甲山组	灰岩	0.709 37~0.709 77	0.709 56
亮甲山组	白云岩	0.709 42~0.709 79	0.709 59