| 车春林,姚磊博,李雪浩,汪飞.甘肃宁县付家山勘查区煤层特征及聚煤规律分析[J].甘肃地质,2026,35(3):12-18 |
| 甘肃宁县付家山勘查区煤层特征及聚煤规律分析 |
| COAL SEAM CHARACTERISTICS AND COAL ACCUMULATION PATTERN IN FUJIASHAN EXPLORATION AREA OF NINGXIAN COUNTY, GANSU PROVINCE |
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| DOI： |
| 中文关键词: 煤层分布 聚煤规律 延安组 甘肃宁县 |
| 英文关键词:coal seam distribution coal accumulation pattern Yan’an Formation Fujiashan exploration area |
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| 中文摘要: |
| 甘肃宁县付家山勘查区地处鄂尔多斯盆地西南缘，是陇东地区重要煤炭勘查区块。 本文以勘查区钻探、测井及样品测试数据为基础，系统分析区内含煤地层、煤层赋存、煤质与构造特征，并从沉积环境、构造演化、古地理背景三方面开展聚煤规律研究。 区内主要含煤地层为中侏罗统延安组，共发育4层可采煤层，其中煤8为主采煤层，呈中厚—巨厚、较稳定分布；煤类以不黏煤、弱黏煤为主，具低灰、低—中高硫、中高挥发分、高发热量、高热稳定性特点；
沉积环境由早期河流相向中期三角洲平原相、晚期湖泊相演化，同沉积褶皱与基底差异沉降控制煤层厚度与空间展布；聚煤作用受温暖湿润古气候、陆内坳陷稳定沉降、河湖—沼泽交替沉积环境共同制约，形成多层系、分带性赋存
的煤炭资源。 研究成果可为该区煤炭资源勘探开发与资源评价提供地质依据。 |
| 英文摘要: |
| The Fujiashan exploration area in Ningxian County, Gansu Province, is situated on thesouthwestern margin of the Ordos Basin and represents an important coal exploration area in the Longdong region.Based on drilling, well logging and sample test data of the exploration area, the study analyzed the coal-bearing strata, coal seam occurrence, coal quality and structural characteristics in the study area, and explores the coal accumulation rules from three aspects: sedimentary environment, tectonic evolution and paleogeographic setting.The main coal-bearing stratum in the area is the Middle Jurassic Yan’an Formation, which contains four minable coal seams. Among them, No.8 Coal Seam is the primary working seam, with a medium-thick to extra-thick and relatively stable distribution. The coal is dominated by non-caking coal and weakly caking coal, and features low ash yield, low to medium-high sulfur content, medium-high volatile matter, high calorific value and high thermal stability. The sedimentary environment evolved from fluvial facies in the early stage to delta plain facies in the middle stage and lacustrine facies in the late stage. Syndepositional folds and differential basement subsidence control the thickness and spatial distribution of coal seams. Coal accumulation is jointly controlled by warm and humid paleoclimate, stable subsidence of intracontinental depressions, and alternating fluvial -lacustrine and swamp sedimentary environments, forming coal resources with multi-layered and zonal occurrence characteristics. The research results can provide a geological basis for coal exploration, development and resource evaluation in this area. |
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