岩性油气藏 ›› 2026, Vol. 38 ›› Issue (5): 4050.doi: 10.12108/yxyqc.20260504
黄力1,2(
), 赵龙梅1,2, 陈东1,2, 赵浩阳1,2, 张艺馨1,2, 石石1,2, 张稳1,2, 季亮2
HUANG Li1,2(
), ZHAO Longmei1,2, CHEN Dong1,2, ZHAO Haoyang1,2, ZHANG Yixin1,2, SHI Shi1,2, ZHANG Wen1,2, JI Liang2
摘要:
以鄂尔多斯盆地宜川地区石炭系本溪组8号煤、二叠系山西组5号煤为研究对象,通过岩心实验测定煤质组分、全硫含量、镜质体反射率、含气量等指标,结合测井解释资料,系统剖析了这2套煤层的岩石学、物性、吸附性能及微观裂缝发育特征,进而开展了煤岩气有利区评价与预测。研究结果表明:①宜川地区8号煤与5号煤在煤体结构、煤岩煤质及热演化程度等方面高度相似,均以原生结构煤为主,煤阶达贫煤—无烟煤阶段,生烃潜力强,Ro均值分别为2.31%、2.24%;孔隙类型均以有机质孔为主,微孔体积占孔隙总体积比例超过67%,且比表面积贡献率超过99%,为吸附气赋存的主要空间。②研究区8号煤层的资源丰度、储层厚度及顶板封盖性能均更优;5号煤层的割理与微裂隙更发育,开发中需扩大开发井井距、降低单井配产,同时控制压裂规模,避免井间串扰与地层压窜问题。③研究区西部为2套煤层共同的Ⅰ类“甜点”区,区内煤层厚度大于5 m,热演化程度、含气量、可压性均表现良好,顶、底板灰岩和泥岩组合封闭条件好,水动力较弱,具备纵向立体开发有利条件。
中图分类号:
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