鄂尔多斯盆地中部湖相有机质沉积环境特征

doi:10.11743/ogg20220313

Abstract

Abstract:

The numbers of measurable elements in lacutrine shale sampels by energy dispersive X-ray fluorescence （ED-XRF） technology are often limited due to insufficient energy configuration. This makes it difficult to fully restore the paleosedimentary environment for samples concerned. Furthermore， some lacutrine organic matter can be of river input origin or indigenously produced in lake water， quantitatively distinguishing one from the another is challenging. In this study， energy configuration of ED-XRF is improved to increase the number of accurately measurable elements to 28. Shale samples from the seventh member of Yanchang Formation （Chang 7） in central Ordos Basin are tested for geochemical characterization of organic carbon， major elements， trace elements and carbon isotopes. The results are used to restore the paleosedimentary environment of organic matter from Chang 7， including the water column， redox and productivity. A mathematical model is established to analyze the organic matter. The results show that the organic matter of Chang 7 shale is formed in fresh water with oxygen deficiency or anoxia， high paleoproductivity but a moderate primary productivity against a warm and humid climate background. For shale in the central Ordos Basin， organic matter is rather lake water produced than terrestrial input.

Key words: organic matter, element geochemistry, sedimentary environment, shale, Yanchang Formation, Wuqi-Ansai area, Ordos Basin

CLC Number:

TE122.1

Bojiang Fan, Liang Shi, Jie Yang, Shan Su, Rong Ma, Yaoli Yuan, Cengyu Zeng. Sedimentary environment of lacustrine organic matter in the central Ordos Basin[J]. Oil & Gas Geology, 2022, 43(3): 648-657.

Figures/Tables 14

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Table 1

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元素	含量/10^-6
元素	范围	平均值
Na	2 990.32～4 645.05	3 777.75
Mg	3 308.94～17 719.90	10 166.78
Al	58 133.92～92 155.36	76 457.26
Si	202 186.51～269 343.95	241 139.00
K	17 498.39～31 706.56	24 754.35
Ca	6 174.31～44 762.47	18 647.80
Ti	2 673.77～4 572.67	3 822.25
Fe	29 800.16～54 079.39	43 159.72
Ba	636.97～4 775.12	1 622.07
Mn	415.69～1 779.19	878.16
P	306.92～1 316.63	631.08
V	32.09～169.37	86.13
Cr	29.29～110.18	78.49
Co	9.47～50.88	26.04
Ni	42.09～73.01	57.25
Cu	20.18～63.25	42.61
Zn	71.55～124.72	102.85
Ga	14.46～31.11	22.86
As	5.93～50.25	16.88
Pb	13.01～33.69	18.72
Th	7.84～17.44	12.67
U	2.09～17.54	7.57
Y	27.75～41.23	32.98
Zr	90.93～190.26	139.23
Nb	8.58～15.48	11.33
Mo	0.19～7.03	2.75
Rb	95.02～211.47	157.28
Sr	303.15～508.52	391.40

微量元素	EF值	微量元素	EF值
Ba	1.14～8.57（2.91）	As	4.62～39.08（13.13）
Ni	0.82～1.42（1.11）	Pb	0.76～1.97（1.09）
U	0.79～6.60（2.85）	Th	0.63～1.39（1.01）
V	0.27～1.41（0.72）	Y	1.20～1.78（1.42）
Cr	0.34～1.29（0.92）	Zr	0.51～1.06（0.77）
Co	0.55～2.97（1.52）	Nb	0.56～1.00（0.73）
Cu	0.47～1.48（0.99）	Mo	0.22～8.20（3.20）
Zn	0.98～1.71（1.41）	Rb	0.69～1.54（1.15）
Ga	0.84～1.81（1.33）	Sr	1.77～2.97（2.28）

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Sedimentary environment of lacustrine organic matter in the central Ordos Basin

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