吉林大学学报(地球科学版) ›› 2016, Vol. 46 ›› Issue (3): 824-830.doi: 10.13278/j.cnki.jjuese.201603204
邹友琴1,2, 刘莉3, 李宏卿4, 颜春5, 曾马荪5, 兰盈盈6
Zou Youqin1,2, Liu Li3, Li Hongqing4, Yan Chun5, Zeng Masun5, Lan Yingying6
摘要:
通过对比页岩气定压开采与承压水定降深开采的相似性,建立起二者指标之间的对应关系;借鉴美国页岩储层典型参数及Barnnet页岩年产量变化规律,从水文地质的角度,建立起水文地质概念模型;利用GMS软件,对页岩气开采进行数值模拟。从模型结果看,11个拟合值中,6个相对误差在5%之内,4个在10%之内,只有一个接近20%,拟合结果较为理想。说明用水文地质方法研究页岩气开采是合理的;也表明开采过程中页岩气产量由游离气和吸附气组成,当游离气开采完毕后,产量主要由吸附气维持,解吸气还有再吸附现象。当盖层开启程度由微裂缝区的25%,50%,75%到100%依次增加时,开采年限按6 a,4 a,2 a,1 a依次减少;不同开启程度下,相同开采年的开采量也依次降低;在每种开启程度下,年产量与原来的年产量的比值也依次降低。任何侧向边界若出现断层,不论其开启程度为微裂缝区的25%,50%,75%还是100%,均达不到定压开采条件。从敏感分析可知,当页岩压裂达到一定程度时,页岩气的析出对页岩气产量影响是最关键的。最后对页岩气开采提出相应的建议。
中图分类号:
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