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Based on the successful utilization of advanced mud gas (AMG) for fluid identification in five production/injection wells in the Snorre field, the fluid identification while drilling technology was deployed for a seismic anomaly within the overburden at the Kyrre formation level. The main objective was to identify the reservoir fluid type (oil versus gas) within the anomaly and to use this information to potentially de-risk a similar shallower seismic anomaly - the Linga prospect at the top Shetland level. Fluid identification while drilling is an award-winning innovation that has been broadly used in exploration and production wells at Equinor. The digital technology combines mud gas and PVT data for accurate reservoir fluid typing and property predictions. Snorre field is one of the first users of the technology and accumulated good experiences regarding the capacity and limitations in reservoir zones. Due to the lack of other good tools to identify the hydrocarbon in overburden in a cost-efficient manner, the Snorre field decided to deploy the fluid identification technology for the task. Utilizing AMG data in the overburden for the four Snorre Expansion Project (SEP) wells showed satisfactory results. Reservoir oil was identified with confidence in the Kyrre formation for the first three wells, and no additional logging was necessary. The 4th well was drilled with higher ROP (above 30 m/hr) and proved a similar oil signature without compromising the data quality. The main objective was met, the fluid type in the Kyrre anomaly was confirmed, and this result was a de-risked Linga prospect. The probability of producing the Linga prospect has increased due to the accurate reservoir fluid type. The experiences in the overburden from the Snorre field show fluid identification from mud gas is a cost-efficient tool and has the potential to be utilized broadly in the overburden. With an accurate fluid identification in the overburden, we can achieve safety assurance, reduced drilling costs, and matured production prospects.

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