In this forum we commonly discuss connections from Oracle to foreign databases. When you want to connect with your SQL Server to Oracle it would be better to ask that in a Microsoft forum as they support their LINKED SERVER mechanism.
The linked server set up is for example described in the Microsoft knowledge base as:
280106 - HOW TO: Set Up and Troubleshoot a Linked Server to Oracle in SQL Server
In newer SQl Server releases the name changed see for example:
How to run a SQL Server 2005 Integration Services package as a SQL Server Agent job step
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Article ID : 912911
As you can see they are commonly using OLEDB driver. So you might have to install Oracle's OLEDB driver as well. Else you might think about using OLEDB to ODBC bridge