岩性油气藏 ›› 2016, Vol. 28 ›› Issue (3): 4857.doi: 10.3969/j.issn.1673-8926.2016.03.008
龚小平1,2,唐洪明1,2,赵 峰1,2,王俊杰1,2,熊 浩1,2
GongXiaoping 1,2, TangHongming 1,2, ZhaoFeng 1,2, WangJunjie 1,2, XiongHao 1,2
摘要:
页岩孔隙结构的定量表征可为页岩储层质量评价提供基础参数,但是利用常规方法很难准确表征页岩的微米—纳米级孔隙结构。 以四川盆地龙马溪组含气页岩为研究对象,综合对比常用的氮气( N 2 )吸附法、高压压汞法、核磁共振法等页岩测试手段的原理及优缺点,提出利用低压氮气吸附法测得的累计孔径分布来拟合页岩核磁 T 2 谱相对应的累计孔径分布,优化页岩核磁 T 2 谱与孔径的转换系数 C ,进而应磁共振测试结果来表征页岩中不同尺度的孔隙分布。 该方法可以弥补传统的低压氮气吸附与高压压汞联合表征方法的不足,因为高压压汞法测试可能会导致页岩破裂,产生大量微米级裂缝,这些微裂缝很难与天然微裂缝区分开。 此外,核磁共振具有对岩样加工简单、人工破坏性小、测试不需外来压力等优点,因此推荐低压氮气吸附法与核磁共振法联合表征页岩的孔隙结构方法,它能科学、准确地表征页岩的孔喉分布。 研究表明,龙马溪组页岩孔径分布曲线具有双峰或三峰特征,主要孔径为 0.2~100.0 nm ,介孔和微孔占优势,孔隙体积百分比分别为 67.75% 和 25.33% 。 最终明确了该区页岩储层孔隙结构的定量表征方法。
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