You have touched on an important subject that is currently hot on the agenda in Nigeria now, in the light of the recent attacks on oil pipe lines in that region.
There are quite a few research studies that have examined this issue. So if you're looking at the subject as a potential topic for your PhD research, you may want to look out the findings from these studies, and identify the suggested areas for further research. A Google Scholar search will reveal quite a few articles on the subject.
However, it is important to mention that CSR is just one aspect of the issues affecting Niger Delta. Most of the oil companies (Shell, Chevron, Exxon-Mobil, etc) at the centre of this debate will tell you that they have appropriate CSR policies in place to address the social issues in the Niger Delta. The issues are rather complex and reflect the socio-cultural and political malaise facing the country. These cannot be studied in isolation.
Corporate Social Responsibility (CSR) is a means by which companies can contribute to the social, economic, and environmental well-being of the communities in which they operate. In the Niger Delta region of Nigeria, multinational oil companies have adopted CSR as a means of addressing the challenges of their relationship with the local communities, which have been turbulent for several decades as a result of the ecological devastation of the Niger Delta region.
However, CSR in the Niger Delta has been challenging due to poor governance and regulatory standards in the region.