Integrated Gas and Oil Zone Evaluation using NMR, Conventional, and Mud Gas Logging Data – A Norwegian Logging-While-Drilling Case History
Speaker: Holger Thern, Baker Hughes, a GE company
Holger Thern is a Technical Lead for NMR research at
the Celle Technology Center at Baker Hughes, a GE company, in Germany. In this
role, Holger aims to connect research activities to the needs of the petroleum
industry for the development of NMR logging services and integrated reservoir
In 1998, Holger joined Western
Atlas’ research department in Houston, Texas, focusing on data interpretation
and technical support for NMR wireline logging applications. In 2000, he became
part of the NMR logging while drilling (LWD) development team for Baker Hughes
INTEQ in Celle, Germany. During the past 18 years, he held different positions
in NMR product development and geoscience research teams. In addition, he was
active in numerous NMR LWD job support activities, many with direct customer
collaboration around the world.
Holger earned a B.Sc. in Physics from the University
of Constance and a M.Sc. in Geophysics from the University of Cologne. He has
authored and co-authored more than one dozen patents and two dozen technical
presence of gas and light oil in hydrocarbon reservoirs has a distinct effect
on commonly used porosity logging measurements such as density, neutron, and
nuclear magnetic resonance (NMR). In case of changes in hydrocarbon composition
along the wellbore, it can be difficult to compensate for gas and light oil
effects resulting in inaccurate estimates of true formation porosity and
saturation. Variations in lithology further complicate the usage of bulk density
and neutron porosity. A new method for improved estimation of formation volumetrics
is presented, combining lithology-independent NMR porosity log data with hydrocarbon
compositional information from surface logging mud gas data. The discussion includes
the compensation of a light HC effect by including bulk density data, as well
as potential complicating matters such as mud filtrate invasion, variations in
mineralogy, and the limited vertical resolution of mud gas data. Data from two
wells drilled across gas, oil, and water intervals in a North Sea clastic
reservoir illustrate the determination of a continuous HI log and the resulting
improvements for porosity and saturation estimates.
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Morning - Tuesday, March 6th, 8am – 9am US Central Time;
Evening - Wednesday, March 7th 8pm – 9pm US Central Time.
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