A NEW METHOD FOR EVALUATING FRACABILITY OF SHALE RESERVOIRS

In this paper, the reservoir brittleness index is determined by mineral composition and content ratio of shale reservoir, and the cementation degree of rock in different reservoirs is predicted based on spontaneous potential and natural gamma logging, and combined with the fracture toughness characteristics of rock mechanics, a new evaluation and prediction method for fracturing ability of shale reservoir is established, which integrates rock mineral composition, cementation degree and fracture toughness of rock. This model can be used to obtain quantitative characterization of fracturing ability in laboratory and field through laboratory test or field logging data. The fracability model established in this paper has been applied and analyzed in typical shale Wells and the evaluation results are consistent with the productivity monitoring data after fracturing, which verifies the accuracy of the model established in this paper.