Reservoir core wettability testing method

The invention discloses a method for testing wettability of a reservoir core. The method comprises the following steps: dripping a liquid drop on a certain surface of the reservoir core; the spreading radius of the liquid drops spread on the surface of the reservoir rock core is obtained; obtaining the volume of liquid drops on the surface of the reservoir core; and obtaining the contact angle of the liquid drop on the surface of the reservoir core according to the spreading radius of the liquid drop spread on the reservoir core and the volume of the liquid drop on the surface of the reservoir core. The technical scheme provided by the invention has the beneficial effects that during operation, liquid drops only need to be dropped on the surface of the to-be-detected rock core, and the contact angle of the liquid drops on the surface of the reservoir rock core is obtained according to the spreading radius of the liquid drops spread on the reservoir rock core and the volume of the liquid drops on the surface o