Offshore sediments found in shallow water locations may comprise variably cemented material. These materials are of significant importance for offshore developments such as wind farms projects. Geotechnical characterisation of these materials is generally challenging because: - It is difficult to obtain continuous in-situ test and push tube sampling data due to refusal in hard layer. - Rock coring is often problematic due to highly weathered and variable nature of these materials. The sample recovery is generally low and often include poor quality fragmented samples. The sites with variably cemented materials are generally characterised using laboratory test data obtained from intermittent depth. However, using this approach it may be difficult to characterise all the key soil layers that may be critical for engineering purpose. Borehole specific drilling parameters (e.g., feed force, torque, penetration rate, rotation speed) are generally measured as a part of geotechnical site investigations. These data are generally used for operational purpose only and are not commonly used for geotechnical site characterisation purpose. This paper examines the use of drilling data for site characterisation purpose. Based on the data obtained from an offshore windfarm site, where variably cemented materials are found, it is shown that the specific energy calculated using the drilling data generally follow similar trend compared with the corresponding CPT data. Furthermore, it is shown that better correlation between drilling energy and test data can be obtained by comparing the complete stress-strain response and not only the peak strength values (as is commonly used in the literature). Based on these results, an alternative approach to correlate the drilling data with the laboratory strength tests is proposed. The proposed approach provides useful guide on how to use the drilling data to assess the continuous strength profile for variability cemented sites where limited/intermittent CPT, sampling data are available.