SQL & PL/SQL

In my DB i have more then 20 sequence are there i need to get all the next values

here i have written the code

please correct me

DECLARE 
v_max              NUMBER;
BEGIN

for rec in (select sequence_name from user_sequences where sequence_name='SEQ_ACHDETAILLOG')  loop

select rec.sequence_name.nextval into v_max from dual;

dbms_output.put_line(v_max);
end loop;
END;

thanks in advance
shk