岩性油气藏 ›› 2017, Vol. 29 ›› Issue (2): 139144.doi: 10.3969/j.issn.1673-8926.2017.02.017
艾林1,2, 周明顺3, 张杰4, 梁霄1,2, 钱博文1,2, 刘迪仁1,2
AI Lin1,2, ZHOU Mingshun3, ZHANG Jie4, LIANG Xiao1,2, QIAN Bowen1,2, LIU Diren1,2
摘要: 准确判识煤体结构是煤层气勘探开发研究的一个关键问题,不同煤体结构类型的煤层,因孔隙大小、裂隙网络和破碎程度不同,对煤层气富集和运移的影响也不相同。根据煤体的破碎程度,将沁水盆地F 区块3# 煤层煤体结构类型划分为原生结构、过渡结构和碎裂结构,并分析了不同煤体结构的测井响应特征。统计表明:随着煤体破碎程度增加,测井曲线上通常表现为密度与电阻率均降低、井径扩大、声波时差增大。在测井资料定性划分煤体结构的基础上,提出利用阵列声波测井资料计算煤岩脆性指数来定量判识煤体结构。通过实际应用认为,用煤岩脆性指数定量判识煤体结构是可行的,判识结果与实际钻井取心资料符合率较高,能够提高煤体结构研究的精度。
中图分类号:
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