基于地震沉积学方法的煤层厚度预测
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摘要
为获得中裕地区的精细煤厚资料,基于相控沉积理论,借助地震沉积学在地层岩性识别及沉积相带划分等方面的优势,提出利用地震沉积学方法预测煤厚的思路。通过对研究区山西组2~#煤层聚煤前后沉积相带分布及其演化与煤厚相关性分析,实现对2~#煤层厚度的预测。结果表明:研究区2~#煤层聚煤前为下三角洲沉积环境,聚煤后为上三角洲沉积环境。后期构造及聚煤后沉积环境对煤厚变化影响较小,而聚煤前沉积环境及其相带分布对煤厚变化起控制作用。煤厚预测结果与钻孔揭露吻合较好,最大绝对误差厚度为0.24 m,最大相对误差为9.19%,精度相对较高,证实了该方法的可行性。
In order to obtain the fine coal thickness data of Zhongyu area,based on theory of facies control sedimentation,the authors put forward the idea of using seismic sedimentology method to predict the thickness of coal seam with the help of seismic sedimentology in lithology identification and sedimentary facies classification and other advantages.The thickness of No.2 coal seam was predicted by analyzing the correlation between distribution and evolution of the sedimentary facies belt and coal thickness before and after the coal accumulation of the No.2 coal seam of Shanxi Formation in research area.The results showed that the No.2 coal seam was in lower delta deposit environment before the coal accumulation and in upper delta deposit environment after the coal accumulation.Later geologic structure and the depositional environment after coal accumulation had little influence on change of coal thickness,while the depositional environment and its facies belt distribution before the coal accumulation played a controlling role in the change of coal thickness.The coal thickness prediction results were in good agreement with the drilling results,the maximum absolute error of the coal thickness was 0.24 m and the maximum relative error was 9.19%,the accuracy was relatively high,which confirmed the feasibility of the method.
In order to obtain the fine coal thickness data of Zhongyu area,based on theory of facies control sedimentation,the authors put forward the idea of using seismic sedimentology method to predict the thickness of coal seam with the help of seismic sedimentology in lithology identification and sedimentary facies classification and other advantages.The thickness of No.2 coal seam was predicted by analyzing the correlation between distribution and evolution of the sedimentary facies belt and coal thickness before and after the coal accumulation of the No.2 coal seam of Shanxi Formation in research area.The results showed that the No.2 coal seam was in lower delta deposit environment before the coal accumulation and in upper delta deposit environment after the coal accumulation.Later geologic structure and the depositional environment after coal accumulation had little influence on change of coal thickness,while the depositional environment and its facies belt distribution before the coal accumulation played a controlling role in the change of coal thickness.The coal thickness prediction results were in good agreement with the drilling results,the maximum absolute error of the coal thickness was 0.24 m and the maximum relative error was 9.19%,the accuracy was relatively high,which confirmed the feasibility of the method.
引文
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[2]刘天放,陈斌,付金生等.地震反演煤层厚度的谱矩法及其应用[A].煤田地球物理岩性勘探技术文集[C].北京:煤炭工业出版社,1996
[3]刘建华,刘天放,李德春.薄层厚度定量解释研究[J].物探与化探,1997(1)
[4]周霞.沁水盆地山西组沉积相及其对煤储层的控制作用[D].中国地质大学(北京),2011
[5]杨帅,陈洪德,侯明才等.基于地震沉积学方法的沉积相研究——以涠西南凹陷涠洲组三段为例[J].沉积学报,2014(3)
[6]高世臣.袁照威.地震属性在沉积相预测中的方法研究——序贯随机模式识别[J].地球物理学进展,2016(3)
[7]Hongliu Zeng,William A Ambrose.Seismic sedimentology and regional depositionalsystems in Mioceno Norte,Lake Maracaibo,Venezuela[J].The Leading Edge,2001(11)
[8]赵海华,吴明荣.关于地震沉积学几个问题的讨论[J].油气地球物理,2009(3)
[9]高荣斌,贺志强,来争武等.豫西新安煤田煤层厚度变化规律及其控制因素[J].煤田地质与勘探,2011(4)
[10]介伟.煤田小构造精细解释方法研究及应用[J].中国煤炭,2015(1)
[11]邱占林,冯金炜,寇贵存等.东坑仔矿区地质构造对煤层的影响[J].中国煤炭,2016(8)