论文部分内容阅读
非常规油气储集孔隙结构复杂多样,以纳米级孔喉系统为主,局部发育毫米-微米级孔隙和裂隙。孔、裂隙大小、形态及三维连通性等微观结构特征对油气赋存状态、运移方式、渗流特征等地质问题研究具有重要意义。常规方法无法实现微纳孔隙多尺度三维结构及连通性分析。本文采用同步辐射多能CT技术,结合数据约束模型(DCM)方法对非常规油气储集微纳孔、裂隙研究,可实现多尺度三维可视化表征,进一步获得孔、裂隙体积统计分布及其三维连通结构等信息。基于上海光源显微CT实验平台,针对碳酸盐岩及陆相页岩两种样品,成功获得了孔、裂隙三维结构以及统计分布、三维连通结构等定量信息。实验结果表明,该方法有望成为非常规油气储集研究强有力的手段。
Unconventional oil and gas reservoirs are complex and diverse in pore structure, dominated by nano-scale pore-throat systems, with locally developed mm-micron pores and fissures. The microstructural features such as pore, fissure size, shape and three-dimensional connectivity are of great significance for the study of geological conditions such as oil-gas occurrence, migration patterns and seepage features. Conventional methods can not achieve micro-nano-pore multi-scale three-dimensional structure and connectivity analysis. In this paper, synchrotron radiation multi-energy CT technology and data constraint model (DCM) method are used to study the unconventional hydrocarbon reservoir micro-nano-pores and fissures, and multi-scale and three-dimensional visualization can be achieved. The statistical distribution of pore and fracture volume and its 3D connectivity Structure and other information. Based on the experimental platform of Shanghai Light Source Microscope (CT), the quantitative information about the three-dimensional structure of pores and fractures, as well as the statistical distribution and three-dimensional connectivity structure were successfully obtained for two samples of carbonate rock and continental shale. Experimental results show that this method is expected to become a powerful means of unconventional hydrocarbon reservoir research.