微米CT在烃源岩微观结构表征方面的应用

Application of micron CT in the characterization of microstructure in source rocks

黄振凯 陈建平 王义军 王华建 邓春萍

Huang Zhenkai Chen Jianping Wang Yijun Wang Huajian Deng Chunping

页岩油气富集机理与有效开发国家重点实验室, 北京 100083 2. 中国石化 石油勘探开发研究院, 北京 100083 3. 南京大学 地球科学与工程学院, 南京 210093 中国石油 勘探开发研究院, 北京 100083 5. 大庆油田有限责任公司 第一采油厂, 黑龙江 大庆 163000

State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Beijing 100083, China 2. Petroleum Exploration and Production Research Institute, SINOPEC, Beijing 100083, China 3. School of Earth Sciences and Engineering, Nanjing University, Nanjing, Jiangsu 210093, China 4. Research Institute of Petroleum Exploration and Development, CNPC, Beijing 100083, China 5. First Oil Production Plant of Daqing Oil Field Company, Daqing, Heilongjiang 163000, China

对松辽盆地白垩系青山口组一段烃源岩的微观结构进行微米CT的三维成像研究。其微观结构特征为:孔隙直径主要在0.7~25 μm之间,孔隙类型主要以粒间孔隙、晶内孔隙为主,孔隙在孔喉的连接下形成连通性较好的孔隙通道。生物碎屑(或有机质)大小由几微米到几百微米不等,主要分布在中等密度的矿物基质中,生物类型以浮游生物和介壳类生物为主。微米CT三维重建技术为精细刻画岩石微观结构特征提供了新的研究方法和手段,但也存在诸如成像分辨率、二维切片的图像处理以及实验结果的地质代表性等问题,针对上述问题产生的原因进行了探讨并提出了初步的解决方案。

Three dimensional imaging micron CT was used to observe microstructure character of hydrocarbon source rocks in the first member of Cretaceous Qingshankou Formation of the Songliao Basin. The pore diameter is in the range of 0.7-25 μm, and the pore types are mainly intergranular and intragranular. Pore channels are formed with connected pore throats. The sizes of biological detritus (or organic matter) are micrometers to a hundred micrometers, mainly distributed in medium-density mineral matrix, and the biological types are mainly plankton and shellfish organisms. As a new tool and research method, the micron CT 3D reconstruction technology can be applied for the description of microstructure character in rocks. However, there are still some problems such as image resolution, image processing of 2D scans and the geological representativeness of the experimental results. In this paper, reasons for these problems have been discussed and subsequently preliminary solutions have been put forward.

国家重点基础研究发展计划(973计划)项目(2014CB239101)和中国石油天然气股份有限公司项目(2014A-0211)资助。

https://doi.org/10.11781/sysydz201603418