Geochemical characteristics and coal-forming environments of deep coal rocks of Permian Shanxi Formation in central and eastern Ordos Basin

被引：0
|
作者：
Fan, Liyong [1 ,2 ]
Shi, Yunhe [1 ,2 ]
Dong, Guodong [1 ,2 ]
Zhang, Junying [1 ,2 ]
Pan, Bo [1 ,2 ]
Wang, Yanqing [1 ,2 ]
机构：
[1] Exploration and Development Research Institute, PetroChina Changqing Oilfield Company, Shaanxi, Xi′an,710018, China
[2] National Engineering Laboratory of Low-permeability Oil & Gas Exploration and Development, Shaanxi, Xi'an,710018, China
来源：
Natural Gas Industry | 2024年 / 44卷 / 10期
关键词：
The Ordos Basin is rich in coal-rock gas resources; showing great potential in the exploration and development of coal-rock gas. The geochemical characteristics of coal rocks and their indications in sedimentary conditions and paleoclimate information can provide an important basis for the formation and favorable area selection of coal-rock gas. In order to explore the geochemical characteristics of No.5 coal rock and the controlling factors of coal rock development in the Permian Shanxi Formation of central and eastern Ordos Basin; this paper tests and analyzes the coal industrial components; total sulfur content; vitrinite random reflectance (Ro); and major and trace elements of No.5 coal rock by observing and sampling drilling cores; and then reveals the coal-forming environments of coal rocks. The following results are obtained. First; the types of No.5 coal rock are mainly bright coal and semi-bright coal; with the ash content ranging from 6.04% to 29.00%; averaging; 17.23%; the volatile content ranging from 12.21% to 35.05%; 21.61%; the moisture content ranging from 0.49% to 0.78%; 0.63%; the total sulfur content ranging from 0.10% to 1.49%; 0.53%; and the Ro ranging from 1.75% to 1.84%; 1.79%; Second; the main element compounds are mainly SiO2 and Al2O3; the trace elements are mainly Sr and Ba; and the rare earth element is dominated by Ce; with an overall higher content. The enriched rare earth elements are mainly light rare earth elements. The supracrustal distribution pattern curve exhibits the characteristics of Eu negative anomaly; indicating that No.5 coal rock is not affected by deep hydrothermal fluid in the process of coal accumulation. Third; based on mSr/mBa; GI*; mSr /mCu and distribution characteristics analysis; it is suggested that No.5 coal rock is mainly formed in the low swamp facies of delta front and the humid forest swamp facies of delta plain. On the whole; saline water; and water body in a warm and humid reducing environment are dominant; and the sedimentary water body is acidic in the north and alkaline in the south. The coal accumulation process of No.5 coal rock is controlled by transgression as a whole. In conclusion; the research results deepen the insights into the geochemical characteristics of No.5 coal rock and the controlling factors of coal rock development in Shanxi Formation in the central and eastern Ordos Basin; and provide a theoretical basis for the exploration and development of deep coal-rock gas. © 2024 Natural Gas Industry Journal Agency. All rights reserved;
D O I：
10.3787/j.issn.1000-0976.2024.10.009
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页码：113 / 125
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