基于地震沉积学方法的煤层厚度预测

发布时间：2018-01-29 02:20

本文关键词： 地震沉积学地层切片岩性识别沉积相煤厚预测　出处：《中国煤炭》2017年03期 　论文类型：期刊论文

【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。
[Abstract]:In order to obtain fine coal thickness data in Zhongyu area, based on facies controlled sedimentary theory, the advantages of seismic sedimentology in stratigraphic lithology identification and sedimentary facies zone division are obtained. This paper puts forward the idea of predicting coal thickness by seismic sedimentology, and analyzes the correlation between the distribution of sedimentary facies and the evolution of sedimentary facies and coal thickness before and after coal accumulation in Shanxi formation 2# coal seam in the study area. The results show that the lower delta sedimentary environment is prior to the coal accumulation in the 2 # coal seam in the study area. The later structure and sedimentary environment after coal accumulation have little influence on the change of coal thickness. The sedimentary environment and the distribution of facies belt before coal accumulation control the change of coal thickness. The prediction results of coal thickness are in good agreement with drilling exposure. The maximum absolute error thickness is 0. 24m and the maximum relative error is 9.19%. The accuracy is relatively high, which proves the feasibility of the method.
【作者单位】：太原理工大学矿业工程学院;煤与煤系气地质山西省重点实验室;山西山地物探技术有限公司;
【基金】：山西省煤基重点科技攻关资助(MQ201401)
【分类号】：P631.4;P618.1
【正文快照】： 煤储层既是煤层气的源岩,又是煤层气的储形态进行精确预测具有重要意义。煤层属于薄层,层,是影响煤层气赋存的一个关键因素,其重要性而薄层的定量预测一直是业界公认的难题之一。不言而喻,因此对煤储层的厚度变化及其空间展布 20世纪80年代,我国煤田地质人员主要根据威得

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