宿东矿区8煤和10煤煤体结构特征及其差异性成因研究
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摘要
目前人们对煤体结构的分类较多,在研究测井曲线判识构造煤方面取得了宝贵的经验,而对煤体结构成因研究相对较少。本文通过对宿东矿区主采煤层8煤和10煤的钻孔测井曲线的解译和井下采样观察,分析了8、10煤层煤体结构特征。从地质力学、分形理论和煤岩学等角度,研究了8、10煤层煤体结构差异及其成因,探讨了构造煤对瓦斯涌、突出的影响。取得了以下成果和认识:
1.8煤层为特厚煤层,煤体结构破碎,构造煤全区发育,呈层状分布,厚薄不均一,在构造复杂区域构造煤厚度所占煤层总厚度较大;而10煤层煤体结构相对较为完整,原生结构和碎裂煤所占比重较大,构造煤分布主要集中在东部拐头和褶皱轴部等构造复杂块段。表现为不同煤层煤体结构存在差异,同一煤层不同部位煤体结构也不相同;
2.褶皱平面变形系数大,构造煤厚度相对较厚;同样分维值大,构造煤也较厚,构造发育程度对构造煤发育有重要影响。
3.8、10煤层位于宿东向斜褶皱中和面以下,8煤离中和面较近,所受构造作用力较大,断层和顺层滑动构造发育,而10煤层离中和面较远,所受构造作用力相对较小,层间滑动不发育,煤体结构相对完整,煤体结构差异性受到构造作用的控制。
4.8煤和10煤的煤岩成分存在一定差异,对煤体结构差异性有一定影响,8煤均质镜质体含量高,质脆易碎,而10煤基质镜质体含量高,胶结作用较强,不易破碎,结构相对完整。
5.矿井瓦斯突出资料表明,发生煤与瓦斯突出区域,构造煤发育,且单层厚度均大于0.5m,进一步说明构造煤是控制煤与瓦斯突出的重要因素,利用构造煤指标进行煤与瓦斯突出危险性区域预测是可行的。
At present,classification of coal structure was researched more,but the cause of coal structure was researched less,valuable experience was gained by researching logging curve to distinguish tectonic coal.The character of coal structure of No.8&10 coal seam was analysed by explaining the drilling logging curve of No.8&10 coal seam in sudong diggings.The difference and the cause of coal structure of the difference and the cause of coal structure of No.8&10 coal seam was researched, with the view of geomechanics,fractal theory and coal petrology etc.The influence of structural coal to gas outburst and emission.Achievements and understanding was acquired as fllows.
1.No.8 coal seam was very thick coal seam,coal structure was crushing,tectonic coal was developed in all the area,tectonic coal was layer distribution and thickness was in homogeneity.The account for tectonic coal was more in the total of coal seam in complex area in constitution.But coal structure of No.10 was relative integrity,the account for fragmentation coal and primary texture was a large proportion,distribution of tectonic coal was focused on structure complex block,such as axial zones of folds and concealed bend of east.The difference of coal structure was existed in different coal seam and in different part of the same coal seam.
2.Coefficients of plane deformation was larger,the thickness of the structural coal was relative thicker.Also the fractal dimension value was larger;the thickness of the structural coal was relative thicker.So the structures development degree has great effect on tectonic coal.
3.No.8&10 coal seam situated under the syncline neutral plane of Sudong,No. 8 coal seam was closer to neutral plane,it endured greater tectonic force,structure of faults and bedding sliding developed.No.10 coal seam was farther to neutral plane,it endured less tectonic force,bedding sliding less developed,coal body structure was relative integrity,the difference of coal structure was controlled by tectonic.
4.Some difference existed in petrography composition of No.8&10 coal seam,it has some effect on coal structure.Telocolinite vitrinite of No.8 coal seam had high content and was fragile,but desmocollinites of No.10 coal seam had high content,and cementation was stronger and unease crushing,and structure was relative integrity.
5.Information of gas outburst hazard zone in a mine suggested,tectonic coal developed in the area of gas outburst hazard zone,and single thickness were all more than 0.5m,this all further showed tectonic coal was important factors for controlling coal and gas outburst,using index of structural coal for forecasting dangerous region of coal and gas outburst was feasible.
1.8煤层为特厚煤层,煤体结构破碎,构造煤全区发育,呈层状分布,厚薄不均一,在构造复杂区域构造煤厚度所占煤层总厚度较大;而10煤层煤体结构相对较为完整,原生结构和碎裂煤所占比重较大,构造煤分布主要集中在东部拐头和褶皱轴部等构造复杂块段。表现为不同煤层煤体结构存在差异,同一煤层不同部位煤体结构也不相同;
2.褶皱平面变形系数大,构造煤厚度相对较厚;同样分维值大,构造煤也较厚,构造发育程度对构造煤发育有重要影响。
3.8、10煤层位于宿东向斜褶皱中和面以下,8煤离中和面较近,所受构造作用力较大,断层和顺层滑动构造发育,而10煤层离中和面较远,所受构造作用力相对较小,层间滑动不发育,煤体结构相对完整,煤体结构差异性受到构造作用的控制。
4.8煤和10煤的煤岩成分存在一定差异,对煤体结构差异性有一定影响,8煤均质镜质体含量高,质脆易碎,而10煤基质镜质体含量高,胶结作用较强,不易破碎,结构相对完整。
5.矿井瓦斯突出资料表明,发生煤与瓦斯突出区域,构造煤发育,且单层厚度均大于0.5m,进一步说明构造煤是控制煤与瓦斯突出的重要因素,利用构造煤指标进行煤与瓦斯突出危险性区域预测是可行的。
At present,classification of coal structure was researched more,but the cause of coal structure was researched less,valuable experience was gained by researching logging curve to distinguish tectonic coal.The character of coal structure of No.8&10 coal seam was analysed by explaining the drilling logging curve of No.8&10 coal seam in sudong diggings.The difference and the cause of coal structure of the difference and the cause of coal structure of No.8&10 coal seam was researched, with the view of geomechanics,fractal theory and coal petrology etc.The influence of structural coal to gas outburst and emission.Achievements and understanding was acquired as fllows.
1.No.8 coal seam was very thick coal seam,coal structure was crushing,tectonic coal was developed in all the area,tectonic coal was layer distribution and thickness was in homogeneity.The account for tectonic coal was more in the total of coal seam in complex area in constitution.But coal structure of No.10 was relative integrity,the account for fragmentation coal and primary texture was a large proportion,distribution of tectonic coal was focused on structure complex block,such as axial zones of folds and concealed bend of east.The difference of coal structure was existed in different coal seam and in different part of the same coal seam.
2.Coefficients of plane deformation was larger,the thickness of the structural coal was relative thicker.Also the fractal dimension value was larger;the thickness of the structural coal was relative thicker.So the structures development degree has great effect on tectonic coal.
3.No.8&10 coal seam situated under the syncline neutral plane of Sudong,No. 8 coal seam was closer to neutral plane,it endured greater tectonic force,structure of faults and bedding sliding developed.No.10 coal seam was farther to neutral plane,it endured less tectonic force,bedding sliding less developed,coal body structure was relative integrity,the difference of coal structure was controlled by tectonic.
4.Some difference existed in petrography composition of No.8&10 coal seam,it has some effect on coal structure.Telocolinite vitrinite of No.8 coal seam had high content and was fragile,but desmocollinites of No.10 coal seam had high content,and cementation was stronger and unease crushing,and structure was relative integrity.
5.Information of gas outburst hazard zone in a mine suggested,tectonic coal developed in the area of gas outburst hazard zone,and single thickness were all more than 0.5m,this all further showed tectonic coal was important factors for controlling coal and gas outburst,using index of structural coal for forecasting dangerous region of coal and gas outburst was feasible.
引文
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[2]中华人民共和国煤炭工业部制定.防治煤与瓦斯突出细则.北京:煤炭工业出版社,1995.1-67
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[5]朱兴珊,徐凤银,肖文江.破坏煤分类及宏观和微观特征.焦作矿业学院学报,1995.2,14(1):28-44
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[8]徐宏武.煤层电性参数的测试和研究.煤田地质与勘探,1995,24(2):53-56
[9]吕绍林,何继善.瓦斯突出煤体的导电性质研究.中南工业大学学报,1998,29(6):511-513
[10]焦作矿业学院瓦斯地质研究所.煤体结构力学特征及煤体结构类型的定量划分分项研究报告,1993,1-18
[11]汤友谊.利用钻孔资料预测矿井未采掘区煤层瓦斯含量.煤田地质与勘探,2001,29(5):23-25
[12]Passey QR,Creaney S.A practical model for organic richness from porosity and resitivity log.AAPG Bulletin.1990.7,4(12):1777-1794
[13]Olszewski A J,Zuber M D,Schraufuagel R A,etal.Integration of log,core and well test data improves coalbed methane reservoir evaluation.International Coalbed Methane Symposium Tuscaloosa,1993:436-451
[14]Wkins JM,Schruagel RA,Olszewski AJ,et al.Estmating coalbed gas content and sorption isotherm using well log data.SPE24905,1992:147-159
[15]傅雪海,陆国桢,秦杰等.用测井响应值进行煤层气含量拟合和煤体结构划分,测井技术.1999,23(2):112-115
[16]Hawkins JM,Schraufugel RA,Olszewaki AJ,et al.Estimating Coalbed Gas Content and Sorption Isotherm Using Well Log Data.SPE24905,1992
[17]hoyer DL,Eealuation and Confirmation of Coal Seam Fractures From Dual-laterolog.Proceedings of the 1993 International Coalbed Methane Symposium,1993
[18]煤炭科学研究院抚顺研究所.煤矿抽放瓦斯技术译文集.北京:煤炭工业出版社,1984:78-81
[19]Mullen M J.Log evaluation in well drilled for coalbed methane.Rocky Mountain Association of Geologists,1989:113-124
[20]张玉贵,樊孝敏,王世国.测井曲线在研究构造煤中的应用.焦作矿业学院学报,1995,14(1):76-78
[21]严家平,王定武.利用测井曲线判别煤的破坏类型及意义.东北煤炭技术,1999.3:50-53
[22]王定武.利用模拟测井曲线判识构造煤的研究.中国煤田地质,1997,9(4):70-73
[23]龙王寅,朱文伟,徐静等.利用测井曲线判识煤体结构探讨.中国煤田地质,1999,11(3):64-69
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