Abstract
It is of great significance to determine the geographic orientation of in-situ stresses for the efficient development of oil and gas resources. Most existing in-situ stress orientation testing techniques can only obtain the relative orientation of in-situ stress and have certain limitations in field applications. In this paper, a new method is proposed to determine in-situ stress orientation by combining laboratory acoustic anisotropy test and paleomagnetic test. This method solves the difficulty in using acoustic anisotropy to determine the geographic orientation of horizontal in-situ stresses. Laboratory test and field case study shows that, compared with the method combining acoustic emission Kaiser effect test and paleomagnetic test, the new method has higher precision and reliability. Meanwhile, the new method has the advantages of higher core utilization rate, simpler test procedures, and lower cost.
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