| 煤层非均质程度测井定量评价方法 |
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| 引用本文： | 罗兵,谢小国.煤层非均质程度测井定量评价方法[J].煤田地质与勘探,2016,44(5):155-159. |
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| 作者姓名： | 罗兵 谢小国 |
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| 摘 要： | 针对强非均质性对煤层气开采影响大的特点，通过分析测井渗透率分布规律可定量评价煤层的平面和纵向非均质程度。采用达西公式确定煤层基质渗透率，运用双侧向测井资料估算裂缝渗透率，绘制煤层渗透率贡献率在序数百分数坐标下对应的累积分布曲线，定义坐标变换后累积分布曲线的斜率为非均质程度系数。实际应用表明:非均质程度系数能够反映不同煤层物性在横向和纵向上的差异，进而可定量评价煤层的非均质性。
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| 关 键 词： | 煤层 非均质性 测井 定量评价 非均质程度系数 渗透率贡献率 |
| 收稿时间： | 2015-09-22 |
Quantitative evaluation of reservoir heterogeneity of coal seam by using logging data |
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| Abstract: | Aiming at the big influence of heterogeneity on CBM extraction, through analyzing the permeability distribution law by using logging data, the planar and vertical heterogeneous degree of coal seam can be evaluated quantitatively. Darcy formula was used to determine the permeability of coal matrix, dual lateral logging data were used to estimate the permeability of fissures, the cumulative distribution curve corresponding to the contribution rate of seam permeability under the ordinal percentage coordinate was drawn, the slope of the cumulative distribution curve after transformation of definition coordinate is the coefficient of heyerogeneous degree. The actual application shows the coefficient of heterogeneous degree can reflect the horizontal and vertical difference of the phsical properties of coal seam, and then the hetrogeneity of seam can be evaluated quantitatively. |
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