Disable auditing of select statements
All enabled audit rules can be found in the below views:
Standard audit + FGA:
select * from dba_stmt_audit_opts;
select * from dba_priv_audit_opts;
select * from dba_obj_audit_opts;
select * from dba_audit_policies;

Unified audit (12c and above):
select * from audit_unified_enabled_policies;

Unified audit policy details:
select * from audit_unified_policies;

With the above, you can find whatever audit was enabled, and disable/modify as needed.