- Tanker accident. Oil spills at sea are caused by various oil tanker accidents every year , most of which are oil tanker collisions caused by weather (such as sea storms), oil tanker hull fractures and intensive shipping routes.
- Deliberate oil leakage due to human factors. For example, improper operation of the operator, operation after drinking, etc., may be important reasons.
- Offshore or offshore oil pipeline leakage.
- The offshore drilling platform exploded.