In-situ oil extraction method for oil shale

The invention relates to an in-situ oil extraction method for oil shale. The in-situ oil extraction method comprises the following steps that firstly, at least three wells are drilled side by side in the area of the oil shale, wherein the well in the middle is a heating well, and the wells located at the two sides of the heating well are a gas injection well and an extraction well correspondingly; secondly, fracturing is conducted on the top area of the oil shale through the heating well, so that a first horizontal fracture area covering the gas injection well and the extraction well is formed in the top of the oil shale; and thirdly, the oil shale is heated to the pyrolysis temperature by means of the heating well, so that oil gas is generated, and the oil gas is extracted out through the extraction well. By adoption of the method provided by the invention, efficient heating of the oil shale can be achieved, and thus in-situ oil extraction efficiency for the oil shale is improved.