岩心裂缝重定向的古地磁方法研究  

A paleomagnetical method to redirect cracks in cores

作　　者：韦乐乐[1] 程鑫[1] 刘秀婷[1] 周亚楠[1] 吴汉宁[1] 

机构地区：[1]西北大学地质学系、大陆动力学国家重点实验室,西安710069

出　　处：《地质科学》2013年第4期1286-1294,共9页Chinese Journal of Geology(Scientia Geologica Sinica)

基　　金：国家自然科学基金项目(编号:41074045,41174055);中国地质调查局国土资源大调查综合研究基金项目(编号:1212010610102);陕西省普通高等学校重点学科专项资金(编号:081802)资助

摘　　要：裂缝信息对于低渗透储层的勘探开发具有重要意义。本文在深入探讨利用古地磁方法进行岩心裂缝重定向原理的基础上,详细介绍了岩心裂缝重定向的工作方法。针对垂直及平行于岩心中心轴的两种样品加工方式,推导出可直接利用退磁结果表达的裂缝方向的公式,并将这一结果应用于鄂尔多斯盆地一口有裂缝井的岩心,取得较好的应用效果。研究结果表明,利用古地磁方法进行岩心裂缝重定向具有操作简便、成本较低、且精度相对较高的特点。本文研究结果对于鄂尔多斯盆地的裂缝系统研究具有参考意义。The crack information is of great significance for the exploration and development of low- permeable reservoirs. After principle of reorientation core-cracks with paleomagnetic method was discussed, the operational approach of that was introduced specially. According to vertical and parallel drilling ways of samples, formulas for crack-redirection were elicited with the results of demagnetization. And the method was applied to the cores of a fractured well in Ordos Basin and achieved good results. The research shows that using paleomagnetic method to redirect cores-cracks has the characteristics of easy operation, low cost and high precision. At the same time,the research is reference for the study of Ordos Basin cracks.

关 键 词：古地磁 岩心定向 裂缝重定向 

分 类 号：P318.44[天文地球—固体地球物理学]