上海庙矿区长城六号井田地质特征及可采煤层对比  

Geological characteristics and correlation of minable coal seams in Changcheng No.6 mine field of Shanghaimiao mining area

作　　者：沈建军 倪月琴 SHEN Jianjun;NI Yueqin(Coal Geology Bureau of Ningxia Hui Autonomous Region,Yinchuan 750002,China)

机构地区：[1]宁夏回族自治区煤炭地质局,宁夏银川750002

出　　处：《陕西煤炭》2024年第11期106-111,共6页Shaanxi Coal

基　　金：地勘基金项目“宁夏石嘴山市惠农区煤层气资源调查及水平井开发应用技术研究”(项目编号:6400-2019-02171)。

摘　　要：上海庙矿区长城六号井田位于鄂尔多斯盆地西北缘,蕴藏着丰富的煤炭资源。以上海庙矿区长城六号井田为研究对象,在充分研究井田地质特征的基础上,从可采煤层地质特征、岩性标志层和测井曲线3个方面进行了可采煤层的对比分析。长城六号井田含煤地层主要为石炭-二叠系山西组和太原组,井田可采煤层自上而下划分为1、3^(-1)、3^(-2)、5^(-1)、5^(-2)、9^(-1)、9^(-2)和10号煤层,煤层厚度变化小,结构简单,煤层间距稳定,可进行全区对比。长城六号井田内比较稳定的标志层主要有3层,自上而下分别为K_(0)黏土岩、K_(1)泥质灰岩和K_(2)泥质灰岩。K_(0)黏土岩是1号煤顶部的标志层,全区可靠的标志层;K_(1)泥质灰岩为7号煤直接或间接顶板,同时也是区分山西组和太原组的标志性层,在整个研究区广泛分布;K_(2)泥质灰岩全区均有分布,是9号煤层直接或间接顶板。此外,3号煤顶部砂岩和8号煤顶部砂岩也可作为长城六号井田的辅助对比标志层。井田内1、5和9号煤层的三侧向电阻率曲线、长源距伽马-伽马曲线和自然伽马曲线形态特征变化规律明显,可作为煤层对比的重要依据。可采煤层地质特征、岩性标志层和测井曲线3个角度相互验证,进一步提高了煤层对比的可靠性。Changcheng No.6 minefield of Shanghaimiao mining area is located in the northwest edge of Ordos Basin,which contains rich coal resources.We study the geological characteristics of minable coal seams,lithologic marker beds and logging curves to make a comparative analysis of the minable coal seams.The coal-bearing series in Changcheng No.6 minefield from top to bottom are mainly the Carboniferous-Permian Shanxi Formation and Taiyuan Formation.The minable coal seams in the minefield are divided into coal seams of 1,3^(-1),3^(-2),5^(-1),5^(-2),9^(-1),9^(-2)and 10.The thickness of the coal seams changes little,the structure is simple,and the coal seam spacing is stable,which can be compared in the whole minefield.There are three stable marker beds in Changcheng No.6 minefield,including K_(0)claystone,K_(1)argillaceous limestone and K_(2)argillaceous limestone from top to bottom.K_(0)claystone is the marker bed at the top of coal seam 1 and a reliable marker bed in the minefield;K_(1)argillaceous limestone is the direct or indirect roof of coal seam 7,and it is also the marker bed to distinguish Shanxi Formation and Taiyuan Formation,which is widely distributed in the whole study area;K_(2)argillaceous limestone is distributed in the whole area and is the direct or indirect roof of coal seam 9.In addition,the sandstone at the top of coal seam 3 and the sandstone at the top of coal seam 8 can also be used as auxiliary marker beds in Changcheng No.6 minefield.The three lateral resistivity curves,long source distance gamma-gamma curves and natural gamma curves of coal seams 1,5 and 9 in the minefield have obvious changes,which can be used as an important basis for coal seam correlation.The geological characteristics of minable coal seams,lithologic marker beds and logging curves are mutually verified,which further improves the reliability of coal seam correlation.

关 键 词：长城六号井田 地质特征 可采煤层 岩性标志 测井曲线 

分 类 号：TD163[矿业工程—矿山地质测量]