Study on failure mechanism of tight sandstone based on moment tensor inversion.

AE events are mainly concentrated in AE events with 1∼5 microcracks, ranging from 0 MPa∼60 MPa, accounting for 99.06%, 98.16%, 98.01% and 97.6% of the total events, respectively, it shows a decreasing trend with the increase of confining pressure.

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From 0∼60 MPa, the number of AE events in the range of 6∼10 is 25, 79, 105, and 151, respectively, accounting for 0.81%, 1.6%, 1.8%, 2.3% of the total number, respectively, showing an increasing trend with the confining pressures, with the increase of confining pressures, there are more and more large magnitude AE events. 5.

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