应用测井方法计算泥页岩有机碳质量分数

Application of logging method for calculating TOC of mud shale

陈柯童 刘华 鲁雪松 田华 张宝收 芦慧 乔柱

中国石油大学（华东）地球科学与技术学院，山东 青岛 266580 中国石油天然气集团公司盆地构造与油气成藏重点实验室，北京 100083 中国石油勘探开发研究院，北京 100083 塔里木油田勘探开发研究院，新疆 库尔勒 841000 东北石油大学地球科学学院，黑龙江 大庆 163318

有机碳质量分数（TOC）是评价页岩气资源潜力的重要参数之一。利用测井信息的特殊响应，可以快速识别井下泥页岩地层。依据大量的实测数据，结合测井方法计算泥页岩TOC，可以有效地筛选富有机质泥页岩层段。以塔里木盆地2口井为例，探讨测井方法计算TOC的适用性。研究认为：经典的?驻lg R法对高—过成熟阶段的海相泥页岩TOC的计算并不适用，对中等成熟阶段的陆相泥页岩TOC的计算具有一定的适用性；对海相、陆相泥页岩利用U曲线法计算TOC具有很好的应用效果；在缺乏成熟度数据的非高—过成熟阶段的泥页岩层段，使用?驻lg R与U曲线组合法计算TOC，可以提高计算值的精确度。

Organic carbon mass fraction is one of the most important parameters for evaluation of the shale gas resources potential. Using the logging information, shale layer can be fast recognized. Based on large quantities of measured data，TOC of marine shale is calculated by using logging method and the favorable shale layers which are rich in organic matters are screened effectively. Taking two wells in Tarim Basin as an example, the applicability for TOC calculation is discussed by using logging methods. The study shows that the classic ?驻lgR method is not fit for TOC calculation of high-over mature marine shale and has certain applicability for medium mature continental shale; while TOC calculation by using uranium logging curve has got good results for marine and continental shale. In the non high-over mature shale interval which is lack of maturity data, a combination of ?驻lgR method and uranium logging curve for TOC calculation can improve the accuracy of calculated value.

10.6056/dkyqt201503017