Abstract：The acoustic emission(AE) technique is investigated to measure rock in-situ stress using the Kaiser effect of rock under uniaxial compression，which characterizes AE increase in an increasing stress exceeds the previous stress. The rock cores are obtained from the vertically drilled exploratory boreholes in Jingan oil field. It is shown that the commonly used Kaiser effect method for estimating in-situ stress is in accordance with the results obtained by instantaneous shut-in method of hydraulic fracturing. And the orientation of the maximum horizontal stress in reservoir by Kaiser effect combining paleomagnetic orientation of cores is also accordance with the results obtained by diplog.
