The straight-notched Brazilian disc (SNBD) specimen is used to test the mode-I and mode-II fracture toughness of a shale gas reservoir. The tests are conducted on 14 shale specimens which are taken from the shale gas reservoir in the southwest Chongqing, China. The technique of high-pressure water jet cutting is applied to process the pre-existing notch within specimens to avoid the influence of central hole on the notch to ensure the accuracy of the testing results. Based on the testing results, mode-I and mode-II fracture toughness prediction models of the shale gas reservoir are established. The predicted fracture toughness and testing results show good agreement. The results indicate that the mode-I and mode-II fracture toughness of the shale gas reservoir are in direct proportion to the rock density and interval transit time, and inversely proportional to the shale content. The prediction models can be used to establish continuous fracture toughness profiles of the shale gas reservoir and effectively guide the selection of optimal layer before hydraulic fracturing.

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