Lithofacies palaeogeography of the Carboniferous and Permian in the Qinshui Basin, Shanxi Province, China

被引:62
|
作者
Shao, Long-Yi [1 ]
Yang, Zhi-Yu [1 ]
Shang, Xiao-Xu [1 ]
Xiao, Zheng-Hui [1 ,2 ]
Wang, Shuai [1 ]
Zhang, Wen-Long [1 ,3 ]
Zheng, Ming-Quan [1 ,4 ]
Lu, Jing [1 ]
机构
[1] China Univ Min & Technol Beijing, Sch Geosci & Surveying Engn, State Key Lab Coal Resources & Safe Min, Beijing 100083, Peoples R China
[2] Hunan Univ Sci & Technol, Hunan Prov Key Lab Shale Gas Resource Utilizat, Xiangtan 411201, Hunan, Peoples R China
[3] 105 Geol Brigade Qinghai Adm Coal Geol, Xining 810007, Qinghai, Peoples R China
[4] Fujian Inst Geol Survey, Fuzhou 350013, Fujian, Peoples R China
来源
JOURNAL OF PALAEOGEOGRAPHY-ENGLISH | 2015年 / 4卷 / 04期
基金
中国国家自然科学基金;
关键词
Palaeogeography; Shanxi Province; Qinshui Basin; Shanxi Formation; Taiyuan Formation; Coal measure; Coalbed methane; Permian; Carboniferous; COAL MEASURES;
D O I
10.1016/j.jop.2015.06.001
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
The Qinshui Basin in the southeastern Shanxi Province is an important area for coalbed methane (CBM) exploration and production in China, and recent exploration has revealed the presence of other unconventional types of gas such as shale gas and tight sandstone gas. The reservoirs for these unconventional types of gas in this basin are mainly the coals, mudstones, and sandstones of the Carboniferous and Permian; the reservoir thicknesses are controlled by the depositional environments and palaeogeography. This paper presents the results of sedimentological investigations based on data from outcrop and borehole sections, and basin-wide palaeogeographical maps of each formation were reconstructed on the basis of the contours of a variety of lithological parameters. The palaeogeographic units include the depositional environments of the fluvial channel, flood basin (lake), upper delta plain, lower delta plain, delta front, lagoon, tidal flat, barrier bar, and carbonate platform. The Benxi and Taiyuan Formations are composed mainly of limestones, bauxitic mudstones, siltstones, silty mudstones, sandstones, and economically exploitable coal seams, which were formed in delta, tidal flat, lagoon, and carbonate platform environments. The Shanxi Formation consists of sandstones, siltstones, mudstones, and coals; during the deposition of the formation, the northern part of the Qinshui Basin was occupied mainly by an upper delta plain environment, while the central and southern parts were mainly occupied by a lower delta plain environment and the southeastern part by a delta front environment. Thick coal zones occur in the central and southern parts, where the main depositional environment was a lower delta plain. The thick coal zones of the Taiyuan Formation evidently occur in the sandstone-rich belts, located mainly in the lower delta plain environment in the northern part of the basin and the barrier bar environments in the southeastern part of the basin. In contrast, the thick coal zones of the Shanxi Formation extend over the mudstone-rich belts, located in the areas of the lower delta plain environments of the central and southern parts of the Basin. The Xiashihezi, Shangshihezi, and Shiqianfeng Formations consist mainly of red mudstones with thick-interbedded sandstones. During the deposition of these formations, most areas of the basin were occupied by a fluvial channel, resulting in palaeogeographic units that include fluvial channel zones and flood basins. The fluvial channel deposits consist mainly of relatively-thick sandstones, which could have potential for exploration of tight sandstone gas. (C) 2015 The Authors. Production and hosting by Elsevier B.V. on behalf of China University of Petroleum (Beijing). This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
引用
收藏
页码:384 / 412
页数:29
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