ICE 2022


The high uncertainty of structure is one of well-known issue in Gulf of Mexico because of low solution of seismic data in most areas. The majority wells were drilled with oil-based mud in highly deviated or horizontal well trajectory. Although the famous wireline pad oil-based mud imager was released more than 5 years, there are lots of problematic well trajectories in offshore not allowed logging with wireline or mechanical conveyance. The recently released world-first dual-physical imager provided the great potential for the structural delineation and facies identification in offshore environment with lower quality seismic area. The bedding boundary dips were picked confidently from resistivity images; and micro-scale faults and fractures are identified and classified from images benefit from the dual-physical measurements. The near well structure was constructed with picked dips and provided the fundamental information for regional structure setting understanding. The crossbedding dips were crossed checked between resistivity image and ultra-sonic image. The paleocurrent analysis from crossbedding was the direct information for the depositional source direction; the fluvial channel and delta sedimentary environment were classified based on texture feature from high resolution images; and 3D sand body were predicted by integration with paleocurrent analysis and sedimentary interpretation. A case study from Gulf of Mexico was used to demonstrate the reservoir characterization from this dual imager. The structure with NE-SW strike was constructed from bedding boundary dips; the fractures and mini-faults are confidently picked and classified based on high quality images. The small angle of strike direction between reservoir structure and minor faults is indicating the history of regional tectonic evolution. The paleocurrent analysis from crossbedding picked from images was indicating the North-West depositional source direction; and dip vector plot for each sand group in three-dimension provided the fundamental information for sand body prediction. And the texture features of images were also used for formation evaluation besides of the sedimentary analysis. The near well reservoir characterization is achieved from single well log-while-drilling dual images.