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在以往研究的基础上,对煤层气地质选区评价方法进行了研究。结果表明,煤层气地质选区评价的实质是要寻找富集、高渗、高压的含煤区。在煤层气地质选区方法方面除了要考虑煤层的基本性质(如煤层厚度、埋深、变质程度、含气量)外,更重要的是要研究煤层气高产富集的主控地质因素,如构造运动、沉积史、生烃史及三者间的关系,煤层上覆地层连续沉积厚度、瓦斯风化带、水文条件等方面对煤层气保存条件的影响;还要考虑古、今应力场对煤层渗透率的影响。这样才能搞清煤层气高产富集条件,指导煤层气地质选区评价研究。以大城地区、开平向斜及沁水盆地为例分析了煤层气保存条件并预测了煤储层高渗区,预测结果与实际试验吻合程度较高。
Based on the previous studies, the method of CBM geological selection is studied. The results show that the essence of the CBM geological selection is to find the coal area with rich, high permeability and high pressure. In addition to considering the basic properties of coal seams (such as coal seam thickness, depth, degree of metamorphism and gas content), it is even more important to study the dominant geologic factors of high production and enrichment of coalbed methane, such as tectonic movement , Sedimentary history, hydrocarbon generation history and the relationship between the three, the coal seam overlying strata continuous deposition thickness, gas weathering zone, hydrological conditions and other aspects of the CBM preservation conditions; but also consider the ancient and modern stress field on the coal permeability Impact. In order to find out the conditions of high yield and enrichment of coalbed methane and guide the evaluation of the geological selection of coalbed methane. Taking the Aycheng area, the Kaiping syncline and the Qinshui basin as an example, the coal seam methane storage conditions are analyzed and the high permeability zone of the coal reservoir is predicted. The prediction results are in good agreement with the actual tests.