Directly mounting Blob storage as a drive (like in your case D:) in SSIS IR isn't supported. SSIS does not natively understand Azure Blob storage as a filesystem.
I think with the Azure Feature Pack for Integration Services, which includes tasks and components that allow SSIS to connect and work with Azure services like Blob storage, you will be able to use the Azure Blob Source and Destination components to read from and write to Blob storage.
So you can modify your existing SSIS packages to replace file paths with Azure Blob storage paths.