沁水盆地重点区块煤储层吸附特征及影响因素

煤储层吸附特征参数是评价煤层气资源和开发潜力的重要参数,煤储层的吸附能力是影响煤层气含量的关键因素之一,也直接影响煤层气井的产能,因此研究煤储层的吸附特征、分析煤储层吸附能力的影响因素对于煤层气的开发具有重要意义。根据等温吸附试验结果,对沁水盆地某区块煤储层的吸附特征进行研究,并探讨煤储层吸附能力的影响因素。结果表明:该区块含气量高,具有较强的吸附能力。煤阶、孔隙率、灰分和煤体结构对煤储层吸附能力有较大影响;孔隙率越大、煤体结构越完整,煤储层吸附能力越强;灰分的增加会降低煤的吸附能力;随煤阶的增加,煤储层吸附能力先增加后减小。

Adsorption characteristics of coal reservoirs in key block of Qinshui Basin and its influencing factors

The adsorption characteristic parameters of coal reservoirs are important parameters for coalbed methane resources evaluation and development potential. Adsorption capacity of coal reservoirs is one of the key factors influencing the coalbed methane content,which directly affect the coalbed methane well production, so research of influencing factors on adsorption capacity of coal reservoirs affects the coalbed methane development in China deeply. Based on the results of isothermal adsorption experiments, investigate the adsorption characteristics of coal reservoirs in key block of Qinshui Basin, meanwhile, research its influencing factors. The results show that, the coal reservoirs have high gas content and strong adsorption capacity. Coal rank, gas content, porosity and coal structure have great influence on adsorption capacity of coal reservoirs. The adsorption capacity increases with the increase of porosity and completion of coal structure. High ash content lead to poor adsorption capacity. With the increase of coal rank, the adsorption capacity increase first, then decrease.