吉林大学学报(地球科学版) ›› 2020, Vol. 50 ›› Issue (2): 608-616.doi: 10.13278/j.cnki.jjuese.20190252
侯伟1, 赵天天2,3, 张雷1, 熊先钺1, 许浩2,3, 巢海燕1, 张伟1, 王伟1, 张慧1
Hou Wei1, Zhao Tiantian2,3, Zhang Lei1, Xiong Xianyue1, Xu Hao2,3, Chao Haiyan1, Zhang Wei1, Wang Wei1, Zhang Hui1
摘要: 煤层气开发过程中储层应力的变化对束缚水饱和度有重要影响。通过对不同煤阶煤储层的煤样进行覆压低场核磁共振系列实验,采用谱图形态经验判定法对核磁T2截止值进行标定,在此基础上分析了不同煤阶储层束缚水饱和度随应力的变化规律,并对保德和韩城区块的束缚水饱和度开展了动态计算。实验结果表明:束缚水饱和度具有较强的应力敏感性,并且在有效应力增加初期变化最为强烈;由于孔隙结构的差异,这种应力敏感性在保德区块表现得更为强烈。动态预测结果表明:由于保德区块储层埋深变化范围较小,其初始束缚水饱和度受埋深影响的总变化量小于韩城区块;埋深较浅的储层束缚水饱和度在开发过程中的应力敏感性更强,但开发过程进行到末期后,束缚水饱和度总的增加幅度基本一致。
中图分类号:
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