内蒙古自治区东胜煤田公尼召勘查区可采煤层分布及岩煤层对比

2017-07-08 08:38:11陈华飞
价值工程 2017年21期

陈华飞

摘要:公尼召勘查区位于东胜煤田的西南角,勘查区含煤地层为侏罗纪延安组,地层平均厚度249.22m,勘查区内钻孔单孔见煤12~26层,累计厚度12.60~30.80m,平均21.90m。含煤系数8.79%。通过研究东胜煤田侏罗纪陆相沉积特征及聚煤变化规律,采用了标志层、岩煤层组合对比、地球物理特征法、层间距、煤层结构、地震波阻抗追索辅以煤质及古生物化石等方法,对勘查区内岩层、煤层进行综合对比,其中对比成层的有13层,可采煤层为6层(3-1、3-2、4-1、5-1、6-2中、6-3),確定了该区主要煤层的赋存层位、形态、分布及变化特征,为该区资源量估算提供了可靠依据。

Abstract: Gongnizhao exploration area is located in the southwest corner of Dongsheng coal field. The coal-bearing strata in the exploration area is the Jurassic Yan'an Formation. The average thickness of the stratum is 249.22m. The single hole sees 12 to 26 layers of coal in drilling area. The cumulative thickness is 12.60 ~ 30.80m, an average of 21.90m. The coal content is 8.79%. Based on the study of Jurassic continental sedimentary characteristics and coal accumulation in Dongsheng coal field, the methods such as marker layer, rock coal seam combination, geophysical characteristic method, interlayer spacing, coal seam structure and seismic wave impedance as well as coal and fossil fossils are used for comprehensive comparison of the rock and coal seam in the exploration area. There are 13 layers through comparison, including 6 commercial beds (3-1, 3-2, 4-1, 5-1, 6-2, 6-3). The storage stratum, shape, distribution and variation characteristics of the main coal seam in this area are determined, which provides a reliable basis for estimating the resource quantity in this area.

关键词:可采煤层;岩煤层对比;公尼召勘查区;东胜;内蒙古自治区

Key words: minable seam;rock seam contrast;Gongnizhao exploration area;Dongsheng;the Inner Mongolia autonomous region

中图分类号:P62 文献标识码:A 文章编号:1006-4311(2017)21-0209-03

0 引言

公尼召勘查区位于东胜煤田的西南角,东胜煤田为早-中侏罗纪陆相沉积型煤田[1],缺乏稳定的标志层,且勘查区内钻孔间距较大、煤层层数较多(单孔见煤12~26层),煤层对比难度较大[2]。本文以东胜煤田资料汇编为基础,结合本次工作情况,根据二维地震勘探主要解释了3-1、4-2、5-1、6-2中四层煤,再结合标志层法、地球物理特征法、层间距对比法、煤层结构对比法、地震波阻抗追索辅以煤质及古生物化石等方法,综合对比勘查区内的主要可采煤层[3]。

1 地质概况

公尼召勘查区位于内蒙古自治区鄂尔多斯市境伊金霍洛旗境内,该区含煤地层为侏罗纪延安组。

1.1 地层

勘查区地层自下而上有三叠纪延长组(T3y■)、侏罗纪延安组(J1-2ya)、侏罗纪直罗组(J2■)、侏罗纪安定组(J2a)、白垩纪志丹群(K1■)及第四系(Q)。……

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