Around Rs 1.83 lakh crore has been invested and over 3 lakh people have been employed so far in four petrochemical investment regions being developed in Gujarat Odisha and Tamil Nadu, the government said Thursday.In an official statement, Minister of State for Chemicals & Fertilisers Mansukh L Mandaviya said the department of chemicals & petrochemicals has registered good progress by facilitating increased investments in Petroleum, Chemicals and Petrochemical Investment Regions (PCPIRs) for boosting industrial development and employment generation.Under the cluster-based development model, the department has identified four PCPIRs - in Gujarat, Andhra Pradesh, Odisha and Tamil Nadu – that are in advanced stages of implementation."Upon completion, these PCPIRs will have an estimated investment of approximately Rs 8 lakh crore and are expected to generate employment for approximately 40 lakh people. So far, around Rs 1,83,000 crore have been invested in these PCPIRs and more than 3 lakh people have been employed," the minister was quoted as saying in the statement.On the successful implementation of PCPIR in Gujarat, Mandaviya said ONGC Petro Additions Ltd (OPaL) has been established as the anchor unit at Dahej.As many as 170 industrial units are already functional, while over 830 units are in different stages of implementation at PCPIR Dahej, the minister said, adding that Rs 86,000 crore have been invested so far generating 1,32,000 jobs.