钻孔剖面多煤层物性X-CT响应及其地质意义.PDF

2012 年 9 月，第 18 卷，第 3 期，511-515页 高 　校　地　质　学　报 September 2012，Vol. 18， No.3， p. 511-515 Geological Journal of China Universities 钻孔剖面多煤层物性X-CT响应及其地质意义 1, 2 1 1 杨兆彪 ，秦 勇 ，兰凤娟 1. 中国矿业大学 煤层气资源与成藏过程教育部重点实验室，徐州 221008； 2. 中国石油大学(华东) 地球科学与技术学院，青岛 266555 摘要：基于钻孔剖面不同煤层的 X-CT 物性响应，分析了煤层物性及其在垂向序列上的非均质性特征。发现研究区 3 号、14 号、 23 号、26 号煤层的孔隙 - 裂隙较为发育，煤中孔隙呈星散状产出，裂隙不甚发育，且多被矿物充填。通过 CT 切片“顺层偏 差”来定量表征煤层的非均质性，发现研究区含煤地层 4 个三级层序主煤层的 CT 偏差在垂向上呈单峰分布，以层序Ⅲ最大， 指示其非均质性最强，同时也说明 CT 方法可用以定量表征煤层的非均质性特征。发现煤样 CT 偏差的垂向分布与海水进退 旋回具有高度的一致性，说明在海水进退控制下的成煤环境是影响煤层非均质性的关键因素。 关键词 ：煤储层；CT；三维重构；非均质性 中图分类号：P618.11　　　　　　　　文献标识码：A　　　　　　　　文章编号： 1006-7493（2012）03-0511-05 X-CT Response and Physical Properties of Multiple Coal Seams on Drilling Columnar Section its Geological Implication 1,2 1 1 YANG Zhaobiao , QIN Yong , LAN Fengjuan 1. Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process (CUMT), Ministry of Education, China University of Mining and Technology, Xuzhou 221008, China; 2. School of Geoscience, China University of Petroleum, Qingdao 266555, China Abstract: Based on physical properties of X-CT on different coal seams in histogram section of borehole, physical properties of coal seams and its heterogeneity on vertical sequence were analyzed. The research found that the pores diffusely distributed in coal of No. 3, 14, 23 and 26 coal seams are well developed in study area, and the fractures are not well-developed and mostly filled by minerals. The CT number deviation was introduced to quantify the heterogeneity of coal. The results showed that the dev