Details of the Abstract
| Title of paper | A high-precision and fast 3D CSEM forward method for the multi-scale hydraulic fracturing model considering anisotropy and micro-fracture structures |
| List of authors | Zhitao XIONG, Xingong TANG, |
| Affiliation(s) | Key Laboratory of Exploration Technologies for Oil and Gas Resources of MOE, Yangtze University, Wuhan 430100, China |
| Summary | In the forward calculation of multi-scale hydrofracturing geo-electrical models, efficiency and accuracy when handling very thin hydraulic fractures is still a big challenge. The quantitative interpretation of electromagnetic monitoring data for hydraulic fracturing involves multi-scale simulations of millimeter-scale fractures within kilometer-scale background formations. This requires designing complex grids and solving large Maxwell equations, leading to low computational efficiency. This paper employs effective medium theory to establish the relationship between the microscopic geometric parameters of hydraulic fractures and the macroscopic anisotropic conductivity of the fractured formation. In the forward modeling, the effective anisotropic medium, which can describe the microscopic geometric structure of fractures, is used to replace the fracture medium in the hydraulic fracturing section. This approach achieves efficient forward modeling of controlled-source electromagnetic methods for multi-scale hydraulic fracturing models that consider the microscopic geometric structure of fractures. Model calculations reveal that even under the same transformation volume and fracturing fluid content, the deflection of hydraulic fractures significantly affects the anomalous distribution of the surface monitoring electric field. This study indicates that in the interpretation of fracturing electromagnetic monitoring data, besides the known significant steel casing effect, the anisotropy of the fractured formation is another crucial factor that needs to be considered. |
| Session Keyword | 2.0 EM theory, modelling and Inversion |
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