Evaluation shale oil and gas is cost effective interval

The present invention provides a method for evaluating a cost effective oil shale interval, the method comprising: determining the purpose of evaluation parameters shale interval according to the acquired log data and core data, evaluation parameters include: organic carbon content, pore degree, formation pressure coefficient and cumulative production of oil and gas and factor elastic parameters; by subtracting the respective cut-off value corresponding to the evaluation parameters to obtain the difference between each evaluation parameter; the difference of each evaluation parameter is greater than 0 point as an active site; the destination segment of a continuous layer of a thickness of accumulated points logging efficient point, the thickness of the continuous accumulation result as a single point active; shale oil and gas accumulation determining economic yield minimum thickness; the target layer in a continuous single efficient point layer thickness is greater than the minimum thickness equal interval cumulative economic yield cost-effective as oil shale interval. The present invention can be determined accurately and effectively cost effective oil shale interval, thereby improving the efficiency of shale oil and gas development.