松藻矿区构造特征及煤体变形程度定量评价研究

发布时间：2018-06-05 17:19

  本文选题：构造 + 煤储层　； 参考：《中国矿业大学》2015年硕士论文

【摘要】：本文以松藻矿区构造与煤体结构为研究对象,以矿井地质资料为基础,深入分析矿区构造特征,揭示了构造发育与分布规律;在区域构造背景基础上,阐明了构造演化序次,并对矿区构造复杂程度进行了定量评价;研究矿区主采煤层储层特征,划分矿区煤体结构类型,探讨了地质构造对构造煤的控制作用,并选择合适指标对矿区M8煤煤体变形程度进行了模糊综合评判。研究表明,研究区构造在平面上形成向西突的“鼓包”形态。“鼓包”内发育有一系列次级褶皱,褶皱表现出向北东方向收拢,西南端撒开的放射状。褶皱强度自东南向西北逐渐降低,最后形成单斜构造。研究区断裂较为发育,但分布不均匀,大中型断层与小型断层走向皆集中在N、NNE方向,具有很好的一致性,断层与褶皱的成生关系密切。研究区构造形态及其演化皆受边界控制,燕山期矿区受南北向挤压力,形成短轴状背斜雏形,喜山期形成了NNE向主体褶皱,是矿区构造的定型期。运用构造曲率法和煤层倾角绝对值对矿区褶皱构造进行了定量评价,矿区东部曲率值和倾角绝对值皆大于西部;运用断层强度和分维值对断裂进行了定量评价,矿区断层强度和分维最大值集中在松藻矿F1逆断层组、渝阳矿羊叉滩背斜核部正断层组和矿区南部逢春矿F2逆断层组三处。将以上各指标的评价成果归一化,并赋予不同权重进行了综合定量评价,“鼓包”内构造复杂程度综合指数值呈现出向东逐渐增大的趋势,在矿区北部则表现为由中部高指数值向四周递减的趋势,指数值与基于断裂和褶皱的定量评价特征保持一致。分析认为M8煤变质程度高,成熟度高,Ro,max在2.5%左右;镜质组含量介于52.1-78.3%之间,无机组分含量相对较高;小孔及微孔较为发育,具有较大的比表面积和孔体积,孔隙率达8.53%;显微裂隙也较为发育。M8煤煤体结构在不同构造部位差异明显:单斜处以Ⅰ类正常结构煤为主,煤体结构受构造扰动小;宽缓褶皱处煤体结构以Ⅱ类过渡性结构煤为主,地质构造对其影响明显;断层带附近及紧凑褶皱处煤体结构以Ⅲ类构造煤为主,构造对煤体结构有着明显的控制作用。运用模糊综合评判法对矿区M8煤煤体变形程度进行了评判,ⅲ类单元44个,ⅱ类单元61个,Ⅰ类单元24个,ⅱ+ⅲ类占总数的81.4%,松藻矿区M8煤体变形程度总体上是中等偏复杂,并从煤与瓦斯突出点分布特征与测井解译构造煤分布特征中得到了验证。
[Abstract]:This paper takes Songzao mining area structure and coal body structure as the research object, based on the mine geological data, deeply analyzes the structural characteristics of the mining area, reveals the tectonic development and distribution law, and on the basis of the regional tectonic background, clarifies the sequence of tectonic evolution. The structural complexity of the mining area is evaluated quantitatively, the reservoir characteristics of the main mining seam in the mining area are studied, the types of coal body structure in the mining area are divided, and the controlling effect of geological structure on the tectonic coal is discussed. The degree of deformation of M 8 coal body in mining area is evaluated by fuzzy comprehensive evaluation. The study shows that the structure of the study area forms a westward "bulge" shape on the plane. There are a series of secondary folds in the "tympanic fold". The fold shows a radial shape of the north-east direction and the southwest end. The fold strength gradually decreased from southeast to northwest, and finally formed monoclinal structure. The faults in the study area are relatively developed, but the distribution is not uniform. The strike of large and medium faults and small faults are concentrated in the NNNE direction, which has good consistency, and the fault is closely related to the formation of folds. The structural morphology and evolution of the study area are controlled by the boundary. The Yanshanian mining area was subjected to the south-north extrusion pressure, forming the embryonic form of the short axial anticline, and the Himalayan stage formed the NNE main fold, which is the formative stage of the ore area structure. The fold structure in mining area is evaluated quantitatively by using the method of structural curvature and absolute value of coal seam dip angle, the curvature value and the absolute value of dip angle in the eastern part of the mining area are larger than those in the west, and the fault strength and fractal dimension value are used to quantitatively evaluate the fault. The maximum fault strength and fractal dimension are concentrated in the F1 reverse fault group of Songzao ore deposit, the normal fault group of the Yangchitan anticline core in Yuyang Mine and the F2 reverse fault group of Fangchun Mine in the south of the mining area. The evaluation results of the above indexes are normalized and given different weights to carry out comprehensive quantitative evaluation. The comprehensive index values of the structural complexity in the "drum bag" show a trend of increasing gradually to the east. In the northern part of the mining area, there is a decreasing trend from the high index value in the middle part to the surrounding area, and the index value is consistent with the quantitative evaluation characteristics based on faults and folds. The results show that M8 coal has high metamorphic degree, high maturity, high Roxmax is about 2.5%, vitrinite content is between 52.1-78.3%, inorganic component content is relatively high, micropore and micropore are relatively developed, and have larger specific surface area and pore volume, the content of vitrinite is between 52.1-78.3%, and the content of inorganic component is relatively high. The porosity of coal is 8.53, and the microstructure of coal body of M8 coal is different in different structural parts. The coal structure is dominated by type I normal coal, and the structure of coal body is less disturbed by structure. The coal body structure in wide and slow fold is mainly type 鈪，

本文编号：1982815