US- based Halliburton has come up with a new logging-while-drilling technology- the ‘EarthStar Ultra-deep Resistivity Service’ that uses azimuthal electromagnetic measurements. The service will help achieve the depth of investigation of more than 200ft and will be used to map the geological structure around a wellbore; enhancing the operator’s knowledge of the reservoir for improvement of recovery potential. EarthStar has a number of applications including geomapping, geosteering and geostopping.