永夏煤田可采煤层发育特征与沉积控制
投稿时间:2019-10-24  修订日期:2021-02-19  点此下载全文
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作者单位邮编
许亚坤 河南省地质矿产勘查开发局第四地质矿产调查院 476000
王 昆 河南省地质矿产勘查开发局第四地质矿产调查院 476000
基金项目:河南省自然资源厅2016年度“两权价款”地质科研项目资助(编号:豫国土资发〔2016〕56号-7)
中文摘要:为系统了解永夏煤田煤层发育特征,对永夏煤田以往地质资料进行综合统计分析,结果表明,研究区可采煤层为山西组的二2煤层、下石盒子组的三2煤层和三4煤层。其中,二2煤层是主力可采煤层,区内大部分可采,结构单一,层位稳定,平均厚度2.67 m;其他可采煤层均为局部可采,结构复杂,含1层到多层夹矸,平均厚度1.08~1.46 m,煤层稳定性相对较差。可采煤层形成于两大沉积体系,即二2煤层以下的潮坪-潟湖沉积体系和二2煤层以上的三角洲沉积体系,煤层厚度和煤层结构主要受研究区内泥炭沼泽持续发育时间、基底形态、碎屑物供给及河流冲刷作用等因素影响。
中文关键词:可采煤层  发育特征  沉积控制  稳定性  永夏煤田
 
Development characteristics and sedimentary control of mineable coal seams in the Yongxia coalfield
Abstract:In order to investigate the development characteristics of mineable coal seam of the Yongxia coalfield,this paper systematically analyzed previous geological data of the study area. The results show that the mineable coal seams in study area are 二2 coal seam of the Shanxi formation and 三2 coal seam and 三4 coal seam of the lower Shihezi formation. 二2 coal seam is the main mineable coal seam. It is minable in most areas with single and stable structures and the average thickness is 2.67 m. The others are locally mineable, they are generally 1.08-1.46 m thick, poorly stable, and have complex structure with 1 layer to multi-layer gangue. The minable coal seams are formed in two major sedimentary systems, which are the tidal-lagoon sedimentary system below 二2 seam coal and the delta sedimentary system above 二2 coal seam. The thickness and structure of coal seams are obviously affected by persistent development time and basement morphology of peat marshes, debris supply, and river scouring.
keywords:mineable coal seam  development characteristics  sedimentary control  stability  Yongxia coalfield
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