Volumes of petroleum resources data are archived in different companies. Complex geospatial heterogeneous data structures complicate the accessibility and presentation of data in petroleum industries. Objectives of the current research are to integrate the data from different sources and connect them intelligently and semantically. Petroleum exploration databases provide a central focus for scientific communities as well as providing useful resources to aide research. However, such resources require constant curation and often become outdated and discontinued. In this research work, we develop an ontology-based system for managing petroleum exploration data that addresses the issues of data integration and information sharing. Ontology approach ensures petroleum data validity that will support petroleum knowledge discovery process.