深部煤储层游离气含量计算方法研究——以鄂尔多斯盆地L区为例  

Study on Calculation Method of Free Gas Content in Deep Coal Reservoirs--A Case Study of L Area, Ordos Basin

作　　者：蔡瑞豪[1] 张兵[1] 晁薇薇 郭明强[1] CAI Ruihao;ZHANG Bing;CHAO Weiwei;GUO Mingqiang(China United Coalbed Methane Corporation Ltd,Beijing 100013;China United Coalbed Methane Corporation Ltd,Shangxi 030200)

机构地区：[1]中联煤层气有限责任公司,北京100013 [2]中联煤层气有限责任公司,山西030200

出　　处：《中国煤层气》2024年第4期19-22,共4页China Coalbed Methane

摘　　要：文章根据深部煤储层特点,游离气含量由总含气量与吸附气含量获得。其中总含气量由煤层工业组分拟合法获得,煤储层的吸附气以物理吸附为主,主要吸附在煤储层的孔隙表面上,因为分形几何公式中的分形维数可以表达孔隙的复杂程度,所以煤层气吸附气含量和分形维数存在一定的相关性,分形维数越高,甲烷吸附量越多,煤储层的吸附气含量越大。根据这一特性构建起L区8+9号煤层吸附气含量模型。最终根据深部煤储层特点获得游离气含量拟合模型,该研究成果为鄂尔多斯盆地L地区8+9号煤层的游离气含量预测提供一种有效手段。Based on the characteristics of deep coal reservoirs, the free gas content is derived from the total gas content and the adsorbed gas content. The total gas content is obtained using the industrial component analogy method for coal seams, while the adsorbed gas in coal reservoirs primarily involves physical adsorption, mainly occurring on the surface of coal reservoir pores. Since the fractal dimension in the fractal geometry formula can express the complexity of pores, there is a certain correlation between the adsorbed gas content of coalbed methane and the fractal dimension. A higher fractal dimension indicates a greater methane adsorption capacity and higher adsorbed gas content in the coal reservoir. According to this characteristic, the adsorbed gas content model for 8+9 Coal Seams in the L Area is established. Ultimately, a fitting model for free gas content is developed based on the characteristics of deep coal reservoirs. This research provides an effective method for predicting the free gas content in the 8+9 Coal Seams of the L Area in the Ordos Basin.

关 键 词：8+9号煤层 游离气 分形维数 吸附气含量 

分 类 号：P618.13[天文地球—矿床学]