Step 1: Understanding the location of hydrocarbon fields in India.
India has both onshore and offshore hydrocarbon fields. Offshore fields are further divided into western offshore (Arabian Sea, off the coast of Maharashtra and Gujarat) and eastern offshore (Bay of Bengal, off the coast of Andhra Pradesh and Odisha).
Step 2: Check each option.
- Tapti: Located in the western offshore basin (Arabian Sea, off the coast of Gujarat and Maharashtra).
- Lakwa: Located in Assam (onshore, northeastern India), not offshore.
- Ravva: Located in the eastern offshore (Krishna-Godavari basin, Andhra Pradesh).
- Panna: Located in the western offshore (Arabian Sea, near Mumbai High region).
Step 3: Conclusion.
Thus, the hydrocarbon fields located in the western offshore of India are:
\[
\boxed{\text{Tapti and Panna}}
\]