Explanation
You can request a bulk export of audit logs, and within 3-4 business days Oracle support will begin making copies of the logs and adding them to buckets in your tenancy. The export includes logs for the specified regions, beginning after you make the request and continuing into the future Exported logs remain available indefinitely.
Specify all the regions you want exported in your request. If you only request some regions, then decide later you want to add other regions, you must make another request Files list a single audit event per line. but in json format
https://docs.cloud.oracle.com/en-us/iaas/Content/Audit/Concepts/bulkexport.htm
https://docs.cloud.oracle.com/en-us/iaas/Content/Audit/Reference/logeventreference.htm