Go to this link friend.
Here you will be able to understand the animation trick used i.e. a smooth update of two layers of ocean modifier almost similar in dimension to give a turbulent ocean type effect. Refer to this video or else the above suggestion is not bad I have seen it and he is obviously correct.I have been interacting a lot with this person(EyeDee10Tee) and he is a highly skilled man and you can follow the above video too. But by blender I see the link I attached as useful.
Have a nice day Ouley