基于"三瞬"地震属性融合的煤厚预测方法研究
Research on coal thickness prediction method based on'three instantaneity'seismic attribute fusion
李蔚林 1孙坤 1王磊 2王东阳 1赵传伟 2吴海波3
作者信息
- 1. 潞安化工集团潞宁煤业有限责任公司,山西 忻州 036700
- 2. 中国煤炭地质总局 物测队,河北 邢台 054000;河北省煤炭地球物理勘探技术创新中心,河北 邢台 054000
- 3. 安徽理工大学地球与环境学院,安徽 淮南 232001;合肥综合性国家科学中心能源研究院(安徽省能源实验室),安徽合肥 230031
- 折叠
摘要
煤层厚度是煤及煤层气开采所关注的重要参数.本文采用"三瞬"地震属性融合的方法进行煤厚预测.通过构建煤厚变化的楔形模型,利用正演数值模拟分析揭示"三瞬"地震属性与煤厚间的映射关系.基于叠后三维地震数据体提取"三瞬"地震属性,利用改进的熵权法计算3个属性的权重值,进而融合计算2层主采煤层的厚度.对比分析验证井位置的煤厚预测与揭露结果,表明利用"三瞬"地震属性融合预测煤厚是可行的,但预测精度依赖于地震资料信噪比与层位拾取精度.因此,针对高质量的叠后地震数据体,本文的方法是煤厚预测的有效手段.
Abstract
Coal seam thickness is an important parameter concerned by coal and coalbed methane mining.In this paper,the method of'three instantaneity'seismic attribute fusion was used to predict coal thickness.By constructing a wedge model of coal thickness variation,the mapping relationship between'three instantaneity'seismic attributes and coal thickness was revealed by forward numerical simulation analysis.Based on the post-stack three-dimensional seismic data volume,the'three instantaneity'seismic attributes were extracted.Improved entropy weight method was used to calculate the weight values of the three attributes,and then the thickness of the two main coal seams was calculated by fusion.The comparative analysis of the coal thickness prediction and exposure results of the verification well position showed that it was feasible to use the'three instantaneity'seismic attribute fusion to predict the coal thickness,but the prediction accuracy depended on the signal-to-noise ratio of seismic data and the accuracy of horizon picking.Therefore,for high-quality post-stack seismic data,the method in this paper was an effective means for coal thickness prediction.
关键词
"三瞬"地震属性/楔形模型/煤厚/熵权法Key words
'three instantaneity'seismic attributes/wedge model/coal thickness/entropy weight method引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据