Real Time Formation Fluid Characterization with Integration of Gas While Drilling Evaluation Techniques in Deepwater Suriname

Summary Accurate reservoir characterization is vital for successful exploration wells, but traditional evaluation methods like wireline logging and well testing can be slow and costly. To tackle these issues, a new approach was applied in a deepwater exploration well in the Guyana-Suriname basin, focusing on Campanian clastic reservoirs. This method uses advanced gas data to enable early fluid characterization during drilling. The integration of gas analysis with Logging While Drilling (LWD) data enhances the understanding of reservoir fluids and optimizes wireline log acquisition. The analysis revealed a lower Gas-Oil Ratio (GOR) oil in the shallow reservoir compared to the deeper reservoir. The results from Gas While Drilling (GWD) analysis helped to optimize wireline formation pressure data acquisition: pretests were attempted mainly where gas peaks indicated hydrocarbon zones. In conclusion, the application of Gas While Drilling (GWD) analysis has proven highly reliable for gaining early insights into hydrocarbon types in Campanian reservoirs in Guyana-Suriname basin. It allows for precise targeting of pressure testing and sampling at identified hydrocarbon intervals. Additionally, GWD helps reduce uncertainties in log interpretation of potential hydrocarbon zones, increasing the chances of successfully acquiring pressure data and samples from specific locations of interest.