Model of potential multiphase methane evolution in the subsurface of Southern Ontario across a wide range of initial gas contents

Numerical modeling was performed to analyze the impacts of potential multiphase conditions on long-term subsurface pressure evolution in subsurface systems. An example site on the Bruce Peninsula in Southern Ontario, Canada was selected due to the large amount of available, high-quality data showing significantly underpressured water and the possible presence of gas phase methane. The system was represented by a 1-D model in which multiphase flow and hydromechanical coupling during the last glacial loading and unloading cycle were simulated. Single-phase flow simulations were performed with the USGS single-phase flow simulator SUTRA, and then both single- and multiphase simulations were performed with the multiphase simulator iTOUGH2-EOS7C from Lawrence Berkeley National Laboratory. This model archive data release contains all the input and output files for the simulations and is intended to accompany an article in the Journal of Geophysical Research: Solid Earth. Descriptions of the data in each subdirectory are given to facilitate understanding of this model archive. File descriptions are provided for select files to provide additional information for understanding this model archive. Support is provided for correcting errors in the data release and clarification of the modeling conducted by the U.S. Geological Survey. Users are encouraged to review the complete journal article to understand the purpose, documentation report construction, and limitations of this model.

本研究开展数值模拟，以分析潜在多相态条件对地下系统中长期地下压力演化的影响。研究选取加拿大安大略省南部布鲁斯半岛的一处典型场址，因其拥有大量高质量实测数据，可反映显著欠压地下水及潜在气相甲烷赋存状态。该系统采用一维模型表征，模拟了末次冰期加载与卸载循环过程中的多相流及水力-力学耦合作用。本研究首先使用美国地质调查局（United States Geological Survey, USGS）的单相流模拟器SUTRA开展单相流模拟，随后使用劳伦斯伯克利国家实验室（Lawrence Berkeley National Laboratory）开发的多相流模拟器iTOUGH2-EOS7C开展单相及多相流模拟。本模型存档数据发布包含所有模拟所需的输入与输出文件，旨在配合《地球物理研究杂志：固体地球》（Journal of Geophysical Research: Solid Earth）刊发的一篇论文使用。为便于理解本模型存档，各子目录内的数据均附有说明文档；同时针对部分选定文件提供了文件说明，以辅助理解该模型存档。本数据集提供支持服务，可协助修正数据发布中的错误，并对美国地质调查局开展的模拟工作进行阐释说明。我们鼓励用户查阅完整期刊论文，以全面了解本模型的研究目的、文档报告编制规范及局限性。