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December Meeting – Nuclear Magnetic Resonance
8th December 2016 @ 3:30 pm - 7:00 pm CETFree
Generously Sponsored by Baker Hughes
The next meeting of the Dutch Petrophysical Society will be at the Kivi building in Den Haag on Thursday 8th December 2016.
The theme of the meeting will be
“Nuclear Magnetic Resonance”
At the meeting we will present two talks by Holger Thern (Baker Hughes and SPWLA 2016 Distinguished Lecturer) and Wim Looyestijn (Consultant)
Joint Interpretation of Magnetic Resonance- and Resistivity-Based Fluid Volumetrics – A Framework for petrophysical evaluation
Holger Thern (presenter) and Geoffrey Page, Baker Hughes
The accurate quantification of fluid volumes is one of the most important tasks for determining the economic value of hydrocarbon reservoirs. Fluid saturation calculation from resistivity logging data has been established for many decades with known benefits and challenges. More recently, the nuclear magnetic resonance (NMR) logging technology has developed as an alternative, robust method for direct fluid volume estimation by separating movable from bound fluids. As today’s reservoirs are becoming more challenging, conventional resistivity logging data evaluation involves increasing difficulties and ambiguities, for instance in complex lithology due to the presence of conductive minerals, low formation water salinity, fractures and vugs, or local variations in water resistivity. NMR logging data processing and interpretation are also not straight-forward in complex carbonates and heavy oil reservoirs, as well as in case of wettability alteration and due to the presence of magnetic minerals. Ambiguities in either of the measurements can be efficaciously addressed by combining data from both logging services.
We present a systematic compilation and discussion of main properties affecting resistivity and NMR fluid volume estimations such as Archie parameters and T2 cutoffs. Several log examples illustrate a wide range of reservoir scenarios. In addition to the log interpretation aspect, we also relate the results to their applications ranging from real-time drilling optimization through hydrocarbon-in-place estimates and reservoir modeling input to production and completion decisions.
About the Authors
Holger Thern is a Technical Lead for NMR research at the Celle Technology Center at Baker Hughes in Germany working with NMR technology for 18 years. Holger earned a B.A. in Physics from the University of Constance and an M.Sc. in Geophysics from the University of Cologne. His work experience includes data interpretation development and technical support for NMR wireline logging applications with Western Atlas in Houston, Texas, and the development of the MagTrak NMR LWD tool in Celle, Germany. Currently he is working on new NMR applications and interpretation methods for both wireline and LWD NMR applications.
Geoffrey Page studied physics at the Royal College of Science in London. He began his oilfield career as a Dresser Atlas field engineer 36 years ago, moved into Petrophysics in Aberdeen 28 years ago, and is now Region Petrophysical Advisor for Baker Hughes based in Aberdeen. He is a former President of the Aberdeen chapter of the SPWLA (AFES) and was honoured with a “life membership.” He has written and presented many papers over the years, helped organise many of the conferences including SPWLA 2008 in Edinburgh, and in his spare time teaches the Petrophysics course of Aberdeen University’s “Integrated Petroleum Geoscience” MSc course.
Forward Modelling of NMR Logs in a Chalk Reservoir
Wim Looyestijn (consultant)
It is well known that interpretation of NMR logs on the basis of core-derived parameters often fails because the down-hole situation is much different from that in the laboratory. Core measurements at full in-situ conditions are in principle possible, but very expensive and therefore bound to span a limited range of properties.
We demonstrate that the same can be achieved by forward modelling of the NMR response. Starting point is a representative set of water-saturated core samples measured at ambient conditions. Forward modelling then introduces changes in the NMR response corresponding to full in-situ conditions, including effects due to the presence of native hydrocarbons, mud filtrate invasion and wettability. Interpretation parameters, such as (variable) T2-cutoff, and permeability exponents can now be computed on NMR data as they appear on the log. Once the workflow has been set-up, any change in conditions is automatically translated in an update of the correlations; this would not be possible with laboratory experiments.
We show that the actual log response is faithfully predicted by our modelling for two wells in a N-Sea chalk reservoir.
This study was presented at the SPWLA symposium in Cartagena, 2012, and received a Best Paper award.
About the Author
Wim Looyestijn is a professional researcher with more than 30 years’ experience with Shell, and since a few years as consultant. His main topic has become interpretation of NMR core and log data on which he became an internationally acknowledged expert. Wim pioneered in utilizing diffusion effects to discriminate oil from water, leading to Shell’s NMR processing packageMacNMR, which set a standard in the Industry. Other developments include derivation of capcurves from NMR, and, more recently, wettability and modeling of in-situ NMR log response.
Wim holds a PhD from Leiden University in The Netherlands, and is a member (and past President) of DPS, SPWLA and SPE. He has been Editor of Petrophysics, and was twice an SPWLA distinguished speaker.
After the talks there will be the opportunity to socialise with fellow professionals over drinks and snacks.
Doors will open for registration and coffee at 3:30 pm and the talks will commence at 4:00 pm. The social hour will begin at 5:30pm.
Thanks to the generosity of our sponsors, attendance will again be free. However please inform us of your intention to attend before 1st December 2016 by sending an email to firstname.lastname@example.org with your name, position and affiliation.