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基于全国主要矿区和勘探区统计资料,总结了煤级、煤岩类型、显微组分组成等煤的岩石物理学因素与煤层含气量、吸附性、渗透性等之间的关系,探讨了煤储层岩石物理学特征的控气作用机理。发现煤级-含气量的“包络线”具有阶段性演化规律,最大含气量的显著变化与煤化作用阶跃高度一致,煤储层含气量较高的地区沿纬向等间距展布且与较高煤级分布区吻合,煤的兰氏体积与镜质组含量关系中存在一个镜质组含量临界值。指出不同煤化作用阶段控气作用的实质在于煤物理结构和化学结构的演化,沉积作用控气的思路对煤储层渗透率非均质性预测具有一定实践意义。
Based on the statistical data of major mining areas and exploration areas in the country, the relationship between petrophysical factors such as coal grade, coal type and microscopic composition of coal and gas content, adsorption capacity and permeability of coal seam is summarized. Mechanism of controlling gas in reservoir rock physics. It is found that the “envelope” of coal-gas content has a gradual evolutional pattern. The significant change of the maximum gas content is consistent with the height of the coalification step. The areas with high gas content in coal reservoirs are equally spaced along the latitudinal and The higher coal rank distribution area is consistent with the existence of a vitrinite content critical value in the relationship between the Rankine volume of coal and the vitrinite content. It is pointed out that the essence of controlling the gas during different coalification stages lies in the evolution of the physical structure and the chemical structure of the coal. The idea of controlling the gas by sedimentation is of practical significance for the prediction of coal reservoir permeability heterogeneity.