黔西六盘水煤田煤层气资源特征与有利区优选

发布时间：2018-04-13 21:10

本文选题：六盘水煤田 + 多煤层　；参考：《中国矿业大学》2017年硕士论文

【摘要】：六盘水煤田煤层气资源量大,资源丰度高,是我国重要的煤层气富集区。但由于该区是典型的多煤层地区,构造煤和高应力发育,煤层气资源赋存的地质条件复杂多变,使得目前比较常见的选区方法和选区指标很难在该区直接应用。本论文以六盘水煤田为研究对象,系统总结了前人的研究成果,在大量煤田地质勘探资料和煤层气井资料基础上,结合实验室测试分析数据,对研究区资源条件、解吸渗流条件、工程条件以及煤储层能量展布特征进行了系统研究和分析;在此基础上,运用一票否决+递阶优选法和煤储层能量系统法进行了煤层气有利区优选,分析对比优选结果,提出了一套适合研究区的多煤层煤层气地质选区指标体系和方法。研究区构造复杂,整体显示为中至高地应力状态、正常—异常高压的储层压力状态。区内煤层气成分主要为甲烷,平均含气量12.24m3/t,具有明显的向斜控气特征,煤层含气量随层位呈波动性变化,风化带深度大约为150m。采用体积法计算了13个主要次级向斜的煤层气资源量及资源丰度,分析了资源分布特征。结果表明,青山向斜、盘关向斜、格目底向斜、郎岱向斜和土城向斜的煤层气资源量较大;盘关向斜、平关向斜、土城向斜、旧普安向斜、大河边向斜的煤层气丰度较高;六枝向斜、杨梅树向斜、补郎向斜和蟠龙向斜资源量和资源丰度都较低,煤层气资源条件较差。研究认为,在六盘水煤田等多煤层地区进行煤层气有利区优选时,应先采用一票否决+递阶优选法,在最大程度保留整个向斜总体特征的基础上,将不适合煤层气开采的向斜排除,优选出煤层气赋存条件较好的向斜;进而采用煤储层能量系统法,在剩余向斜中定量评价煤层气有利区三元判识参数,依次选出有利区、较有利区和一般区。评价结果显示,土城为最有利向斜,格目底和盘关为较有利向斜,青山、小河边和旧普安为一般向斜,六枝、郎岱、大河边、平关、补郎、蟠龙和杨梅树等为不利向斜。
[Abstract]:Liupanshui coalfield is an important coalbed methane rich area with large amount of resources and high abundance of resources.However, because this area is a typical multi-seam area, tectonic coal and high stress are developed, and the geological conditions of coalbed methane resources are complex and changeable, it is difficult to apply the common selection method and selection index directly in this area.This paper takes Liupanshui coalfield as the research object, systematically summarizes the previous research results, on the basis of a large number of coalfield geological exploration data and coalbed gas well data, combined with laboratory test and analysis data, the resource conditions of the study area are analyzed.The desorption and percolation conditions, engineering conditions and the characteristics of coal reservoir energy distribution are systematically studied and analyzed.Based on the analysis and comparison of the optimal selection results, a set of index system and method for the geological selection of multi-seam coalbed methane in the study area are put forward.The structure of the study area is complex, the whole shows the medium to high ground stress state, the normal and abnormal high pressure reservoir pressure state.In this area, methane is mainly composed of methane, with an average gas content of 12.24 m3 / t, which has obvious syncline controlled gas characteristics. The gas content of coal seam fluctuates with the horizon, and the depth of weathering zone is about 150 m.The CBM resources and abundance of 13 major secondary synclines were calculated by volume method, and the distribution characteristics of resources were analyzed.The results show that the coalbed methane resources of Qingshan syncline, Panguan syncline, Gmudhi syncline, Langdai syncline and Tucheng syncline are relatively large, the coalbed methane abundance of Panguan syncline, Pingguan syncline, Tucheng syncline, old Puan syncline and big riverside syncline are relatively high.The resources quantity and abundance of Liuzhi syncline, Myrica syncline, Bulong syncline and Panlong syncline are low, and the conditions of CBM resources are poor.It is considered that in the optimal selection of coal-bed methane favorable areas in Liupanshui coalfield and other multi-seam areas, one vote veto hierarchical optimization method should be adopted first, on the basis of preserving the overall characteristics of the whole syncline to the maximum extent.The syncline which is not suitable for coalbed methane exploitation is excluded, and the syncline with better occurrence condition is selected, and then, by using the method of coal reservoir energy system, the ternary identification parameters of favorable areas of coalbed methane are quantitatively evaluated in the residual syncline, and the favorable areas are selected in turn.More favorable area and general area.The evaluation results show that Tucheng is the most favorable syncline, Gmuddy and Panguan are more favorable synclines, Qingshan, Xiaohe edge and Old Puan are general synclines, six branches, Lang Dai, big river, Pingguan, Bulang, Panlong and bayberry trees are unfavorable synclines.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.13

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