Porous medium hydrate sample preparation method with controllable hydrate distribution

The invention discloses a porous medium hydrate sample preparation method with controllable hydrate distribution. The method includes the following steps: 1. generating a three-dimensional (3D) printing mold; 2. calculating the mass of a required dry porous medium and water; 3. mixing the water and the dry porous medium; 4. in a constant-temperature refrigerator 3, prefabricating an ice-containingporous medium sample and a low-temperature dry porous medium sample; 5. making the temperature of a methane gas lower than the ice point; 6. filling the low-temperature dry porous medium sample and the ice-containing porous medium sample into a reaction kettle by layers; and 7. filling a low-temperature methane gas into the reaction kettle until a predetermined hydrate synthesis pressure is reached, regulating the temperature of a sample testing system 5 to a predetermined hydrate synthesis temperature, and synthesizing a hydrate. An artificial sample prepared by this method can simulate a porous medium hydrate sampl