Abstract
Fracture-filling hydrate reservoirs have been widely discovered, and electrical properties are typically employed for the characterization of fractured reservoirs. However, fractured hydrate reservoirs are usually electrically anisotropic, and the distribution of hydrate in the fractures will significantly affect the anisotropic electrical properties of the reservoirs. Therefore, the accurate quantification of hydrate requires understanding the effects of hydrate distribution on the anisotropic electrical properties of fractured reservoirs. We have developed a two-step effective medium modeling approach for the anisotropic electrical properties of reservoirs with floating and bridging hydrate in the aligned fractures, and applied it to studying the effects of floating and bridging hydrate on the anisotropic electrical properties of fractured reservoirs with varying fracture parameters and background electrical properties. The aspect ratios for the hydrate with distinct distribution, the only unknown parameters in the model, are determined by best fitting the modeling results to a published numerical data set for the hydrate saturation dependent anisotropic electrical conductivity of a fractured reservoir with floating and bridging hydrate in the aligned fractures. The fracture parameters and the background conductivity are found to both affect the anisotropic electrical properties of the fracture-filling hydrate reservoirs, and the effects are systematically impacted by the hydrate with different distribution in the fractures. The results reveal the effects of hydrate distribution on the anisotropic electrical properties of fractured reservoirs, and provide a modeling basis for the accurate quantification of hydrate in fractured reservoirs through measured anisotropic electrical properties.
Published Version
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