焦坪矿区煤层气资源特征

发布时间：2018-04-19 13:30

本文选题：地质构造 + 煤储层特征　；参考：《西安科技大学》2015年硕士论文

【摘要】：本文以焦坪矿区勘探和生产揭露相关资料为基础,运用构造地质学理论、煤层气赋存的构造控制理论、构造控气理论和煤层气地质综合理论,并采用定性、定量法,多元线性逐步回归等方法分析了地质构造的发育特征和煤层气的赋存与分布特征,总结分析了研究区煤层气资源特征。从而获得了以下新的认识:(1)研究区内断裂构造不甚发育,主要发育北东向和北西向双向交织的宽缓褶皱构造,可采煤层4-2煤层较稳定,厚度大,埋深浅到中等,煤层顶底板岩层相对致密,煤储层压力不大,水文地质条件简单,从而有利于煤层气赋存;(2)研究区大部分区域属于N2-CH4带内,区内矿井均为高瓦斯矿井,从南向北绝对瓦斯涌出量呈现降低的趋势,一般以普通涌出形式为主;(3)从煤层特征、构造特征、煤层的埋藏特征及水文地质特征四方面分析了影响煤层气分布的因素,认为上述各因素对研究区煤层气的分布都有不同程度的影响,但褶皱构造对煤层气的分布与赋存起控制作用,向斜部位煤层厚度大,埋藏深,有利于煤层气的保存,而背斜正好相反;(4)构造对煤层气的分布起主控作用,采用逐步回归分析法得出煤层气含量主要与小街砂岩厚度,含油强度、砂泥岩比率关系明显。(5)研究区煤层气地质储量9.84亿m3,平均资源量丰度0.3×l08m3/km2,可抽瓦斯面积达2.03km2,主采煤层煤层气资源量已达到9400×104m3,可抽采瓦斯资源量6580×104m3,资源丰富,可开发利用。
[Abstract]:Based on the related data of exploration and production disclosure in Jiaoping mining area, this paper applies the theory of tectonic geology, the theory of structural control of occurrence of coalbed methane, the theory of tectonic control gas and the comprehensive theory of geology of coalbed methane, and adopts qualitative and quantitative methods.The development characteristics of geological structure and the occurrence and distribution of coalbed methane are analyzed by multivariate linear stepwise regression, and the characteristics of coalbed methane resources in the study area are summarized and analyzed.Thus, the following new understanding is obtained: (1) the fault structure in the study area is not very developed, mainly developed a wide and gentle fold structure intertwined in the direction of NNE and NW, which can be used for mining coal seam 4-2, which is relatively stable, thick, and buried deep to medium.The roof and floor strata of coal seam are relatively compact, the pressure of coal reservoir is not large, and the hydrogeological conditions are simple, which is advantageous to the occurrence of coalbed gas in the study area. Most of the areas in the study area belong to the N2-CH4 zone, and the mines in the study area are all high gas mines.From the south to the north, the absolute gas emission presents a decreasing trend, generally in the form of ordinary emission. The factors affecting the distribution of coalbed methane are analyzed from four aspects: coal seam characteristics, structural characteristics, buried characteristics of coal seam and hydrogeological characteristics.It is considered that the above factors have different effects on the distribution of CBM in the study area, but the fold structure controls the distribution and occurrence of CBM, and the coal seam in the syncline is thick and buried deep, which is beneficial to the preservation of CBM.The anticline, on the contrary, plays a major role in controlling the distribution of CBM. By using stepwise regression analysis, it is concluded that the content of CBM is mainly related to the thickness and oil-bearing intensity of small street sandstone.The relationship between sand and mudstone ratio is obvious.) in the study area, the coal bed methane reserves are 984 million m3, the average resource abundance is 0.3 脳 10 8 m 3 / km 2, the area of gas drainage is 2.03 km 2, the coal bed methane resource of main coal seam has reached 9400 脳 10 4 m 3, the amount of gas resource can be extracted and produced 6580 脳 10 4 m 3, which is rich in resources and can be exploited and utilized.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD712.6

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