论文详情
分别从模型构建技术与测井实际应用两方面对数字岩心和数字井筒技术研究与应用进展进行了介绍。总结了单孔隙介质系统、双孔隙介质系统、多元多孔结构和多尺度融合的数字岩心建模方法, 探讨了数字岩心建模在电学特性、声学特性、渗流特性和核磁共振特性方面的应用。由于数字岩心技术的建模和数值模拟主要集中在微米级甚者纳米级, 探索微观尺度下的岩石物理属性不能有效地解释宏观因素(岩石结构、层理、裂缝等)对岩石物理属性的影响规律, 因此发展了数字井筒建模技术。基于多尺度数字岩心并结合电成像、常规测井等多种信息构建三维数字井筒是一门新兴技术。该技术能够在大尺度上反映井周孔隙度的连续变化, 结合核磁技术、压汞、常规测井等信息可应用于电性、弹性、渗流特性等的模拟, 为井震结合提供虚拟测井数据, 可用于解释各种微、宏观因素对地层岩石物理属性的影响规律, 有望成为未来三维测井数据处理与解释的主要辅助工具。
Digital cores can be used for the fine characterizations of rock microstructures.Currently, this technology is crucial for analyzing rock microstructures and rock physical properties.Generally, the methods of modeling digital cores can be divided into physical experimental methods, numerical reconstruction methods, and combination fusion methods.In this study, a digital core and digital wellbore are introduced from the aspects of model building and well logging applications.The digital core model building methods for single-and double-pore medium systems, multiporous structures, and multiscale fusion are summarized.The applications of digital core modeling in electrical, acoustic, seepage, and nuclear magnetic resonance properties are discussed.Because the modeling and numerical simulations utilized in the digital core technology are mostly concentrated at the micro or even nano level, exploring the petrophysical properties at the microscale cannot effectively explain the influence of macro factors(rock structure, stratigraphy, fractures, etc.) on the petrophysical properties.Notably, the digital wellbore modeling technology is an emerging technology adopted to construct three-dimensional digital wellbores based on multiscale digital cores combined with electrical imaging, conventional logging, and other information.This technology, combined with nuclear magnetic technology, mercury pressure, conventional logging, and other information, can reflect continuous changes of well periporosity on a large scale.Moreover, it can be applied to the simulations of electrical, elastic, and seepage characteristics and provide virtual logging for well seismic combinations, which can be used to explain the influence of various micro and macro factors on the petrophysical properties of the formation.It is also expected to serve as the main auxiliary tool for the processing and interpretation of three-dimensional logging data in the future.