Abstract：The fault vertical sealing hydrocarbon ability with mudstone caprocks is mainly influenced by the displacement pressure of fault rocks, the caprock-fault juxtaposition thickness, and the hydrocarbon residual pressure in underlying reservoirs.The greater of displacement pressure of fault rocks, the thicker of caprock-fault juxtaposition thickness, and the smaller of hydrocarbon residual pressure in underlying reservoirs, the stronger of fault vertical sealing hydrocarbon ability with mudstone caprocks, and vice versa.A comprehensive evaluation of fault vertical sealing hydrocarbon ability with mudstone caprocks is proposed in the paper based on the displacement pressure of fault rock, the caprock-fault juxtaposition thickness, the hydrocarbon residual pressure in underlying reservoirs, and hydrocarbon permeation and dissipation velocity within mudstone caprocks.The proposed comprehensive evaluation is applied to the structures of Huhe and Nuoren in Hailar Basin.The permeation and dissipation velocity at 14 measuring points within mudstone caprocks are less than 0, which indicates that the vertical sealing hydrocarbon ability is relatively strong and it is conducive to the hydrocarbon accumulation.These evaluation results are coincident with the hydrocarbon discovery in the area and prove the validity of the proposed approach.
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