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Experimental Measurement and Logging Calculation Method of Fracture Width Based on a Large-Scale Granite Physical Model

In recent years, some large-medium-sized buried-hill fractured reservoirs have been discovered in the Bohai Sea and South China Sea. As a result, the buried-hill fractured reservoirs gradually became an important area for offshore exploration and development in China. The reservoir space of buried-hill fractured reservoirs is mainly composed of pores and fractures. Many production practices show that fractures are the key factor in determining the production of buried-hill fractured reservoirs, and are also the focus and difficulty of reservoir evaluation. Since the 1990s, many researchers have used numerical simulation or physical models to study the method of quantitative evaluation of fracture width respectively. However, the physical model mainly uses smooth fractures without considering the roughness of fractures, and the physical model does not involve fractures below 200μm, which is quite different from the actual fractures in the buried- hill fractured reservoirs. To solve the problem of quantitative evaluation of fracture width, a large-scale granite physical model containing micrometer and irregular fractures is developed independently based on the previous work. Firstly, 40 pieces of 1m×1m×1m granite rocks with lithology similar to that of buried-hill fractured reservoirs are collected, and rough fractures with different widths and morphologies are designed. Fracture-bearing formations in borehole environments are simulated. A large-scale granite physical model with micrometer and irregular fractures for the data collected by electrical imaging logging instrument A and B is established. Secondly, the fractures of the physical model are observed and described, and accurate fracture widths are obtained by measuring with fracture width gauges, which are precise to 1μm. Finally, A and B electrical imaging logging of the physical model are collected under different mud conditions. The relationship between the response of electrical imaging logging of various widths and morphologies of rough fractures is analyzed under different formation contrasts.
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