黔西珠藏向斜主要煤储层临界解吸压力研究

发布时间：2018-03-24 02:29

本文选题：煤层气　切入点：珠藏向斜　出处：《中国矿业大学》2015年硕士论文

【摘要】：本文以黔西珠藏向斜为研究对象,在统计大量煤田地质勘探资料和煤层气井勘探资料的基础上,结合实验测试数据,分析了研究区不同含气系统的吸附-解吸特征及临界解吸压力分布规律;利用灰色理论确定了不同含气系统临界解吸压力的主控因素,建立了GM(0,5)预测模型,并对16、23号煤层临界解吸压力进行了预测。研究区内,不同含气系统主采煤层均具有较强的吸附能力。在垂向上,VL和PL呈现波动式变化,16号煤层临界解吸压力在各井田分布规律不同;在平面上,16号煤层临界解吸压力与含气性分布规律基本一致。分析认为:临界解吸压力本质上受沉积环境等宏观因素以及煤物质组成等微观因素的共同作用,宏观因素制约微观因素,二者相互耦合共同控制煤储层的含气性和吸附性特征,同时受实验条件的影响,三者共同决定了临界解吸压力的大小。利用灰色系统理论,分别计算了不同含气系统临界解吸压力控制因素的灰色关联度。其中,埋深和储层压力对三个含气系统临界解吸压力影响均比较大,而其它因素只对个别含气系统产生较大影响;同时,依次在各含气系统内选取关联度最大的5个影响因素建立了GM(0,5)预测模型,预测结果符合精度要求和全区一般规律,所建模型能够用于研究区不同含气系统临界解吸压力值的预测。
[Abstract]:In this paper, taking the Zhu-Tibet syncline in western Guizhou as the research object, based on the statistics of a large number of coalfield geological exploration data and coalbed gas well exploration data, combined with the experimental test data, The characteristics of adsorption-desorption and the distribution of critical desorption pressure in different gas-bearing systems in the study area are analyzed, and the main controlling factors of critical desorption pressure in different gas-bearing systems are determined by using grey theory. The critical desorption pressure of coal seam 1623 is predicted. The main coal seams of different gas-bearing systems have strong adsorption capacity. VL and PL fluctuate in vertical direction, and the critical desorption pressure of No. 16 coal seam is different in each mine field. On the plane, the critical desorption pressure of No. 16 coal seam is basically consistent with the gas-bearing distribution law. The analysis shows that the critical desorption pressure is essentially affected by macro factors such as sedimentary environment and microscopic factors such as coal composition, etc. Macroscopical factors restrict microcosmic factors, and they control the gas-bearing and adsorptive characteristics of coal reservoir together with each other. At the same time, under the influence of experimental conditions, the critical desorption pressure is determined by the three factors, and the grey system theory is used. The grey correlation degree of critical desorption pressure control factors of different gas-bearing systems is calculated respectively, in which the influence of buried depth and reservoir pressure on critical desorption pressure of three gas-bearing systems is relatively large. At the same time, five factors with the largest correlation degree are selected in order to establish the GM0 / 5) prediction model. The prediction results accord with the precision requirements and the general law of the whole region, and the results of the prediction are in accordance with the requirements of accuracy and the general law of the whole region, and the prediction results are in accordance with the requirements of accuracy and the general law of the whole region. The model can be used to predict the critical desorption pressure of different gas-bearing systems in the study area.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.1

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