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
蔡瑞豪 1张兵 1晁薇薇 2郭明强1
作者信息
- 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
- 折叠
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.
Abstract
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 com-ponent analogy method for coal seams,while the adsorbed gas in coal reservoirs primarily involves physi-cal 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.Ul-timately,a fitting model for free gas content is developed based on the characteristics of deep coal reser-voirs.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Key words
No.8,9 Coal Seams/free gas/fractal dimension/adsorbed gas content引用本文复制引用
出版年
2024
NETL
NSTL
万方数据