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A Petrophysical Approach to Evaluation from Measured While Drilling Gamma Ray, Case Study in the Powder River and Delaware Basins

One 
of the most common subsurface data sets that is easily accessible and often 
underutilized is the acquired measuring while drilling (MWD) gamma ray 
(GR-GAPI) log. Data is acquired from a given gamma ray tool positioned within 
the drill string and pulsed up to the surface through the mud column in the 
wellbore. Typical use of the data is for subsurface geologists, drillers and 
others to correlate the data to known stratigraphic signatures and steer wells 
through horizontal target zones. Through that correlation, an association to 
the geologic stratigraphic column can be made and the team of subsurface 
scientists adjusts where, how fast, and why they choose to continue drilling. 
The technique of correlation applies to both the conventional and unconventional 
application. In the unconventional application, 
the data is also typically acquired along the length of the horizontal 
wellbore. From a petrophysical standpoint, just acquiring a gamma ray 
can limit the amount of information and 
ability to fully evaluate the properties along the length of the well. In this 
study, we share and demonstrate how to utilize the MWD GR for 
petrophysical evaluation beyond just a volume of shale or volume of clay 
interpretation. The workflow will allow full integration of a comprehensive 
petrophysical evaluation that can then be utilized to support all subsurface 
understandings and modelling efforts.