Reservoir reforming method

The invention provides a reservoir reforming method. The reservoir reforming method includes the steps that the maximum horizontal principle stress and the minimum horizontal principle stress of a predetermined reservoir are measured; a horizontal well comprising a vertical section and a horizontal section is drilled, wherein the included angle between the track of the horizontal section and the maximum horizontal principle stress or the minimum horizontal principle stress ranges from 30 degrees to 60 degrees; a well completion procedure is executed; the predetermined reservoir is cracked so that a crack can be formed in the predetermined reservoir in the direction of the maximum horizontal stress. At the initial design stage, in consideration of the possible extension direction of the crack when the reservoir is cracked, the included angle between the extension direction of the horizontal section and the maximum horizontal principle stress or the minimum horizontal principle stress of the predetermined reservoir is made to range from 30 degrees to 60 degrees, so that the horizontal well has good experience completeness and a good oil-guiding effect of the crack, and then the oil and gas production rate is easily increased.