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DPS December 2022 Meeting – Electromagnetic Methods for Formation Saturation Determination
8th December 2022 @ 4:00 pm - 6:00 pm CETFree
On Thursday 8th December 2022 we will be holding our December meeting with the topic “Electromagnetic Methods for Formation Saturation Determination”.
The meeting will be held at our usual venue KIVI in Den Haag (Prinsessengracht 23, 2514 AP Den Haag) with doors opening for pre-meeting coffees at 15:30, and the meeting commencing at 16:00. Note we will be holding the meeting in the ‘Molkamer’ on the first floor rather than our usual venue the Grote zaal.
You can register for the meeting using the usual DPS email, or via the form below.
We will have two presenters: Geoff Page, Europe Region/Global Petrophysics Advisor, Baker Hughes and Scott J. Jacobsen, Vice President Interpretation Development, NoHiddenPay, LLC, who will share their expertise in two talks. Abstracts and presenter biographies are below.
After the meeting there will be our traditional pre-Christmas social with drinks at a local cafe.
As always, thanks to the generosity of our sponsors, attendance is free for members of the DPS.
Looking forward to seeing you at the meeting,
The Dutch Petrophysical Society Board
Title: Converting Resistivity to Saturation: The Development of Saturation Equations – “Which one should I use?”
Speaker: Geoffrey C. Page, Europe Region/Global Petrophysics Advisor, Baker Hughes.
Quantitative water saturation analysis was introduced by Archie in 1942, and since then has been refined by many people, resulting in a wide variety of equations, all based on detailed lab work. However; today core is expensive, it is very easy to pick an equation from a list of computer options, press a button, and get a result that we like – but do we know the equation origins and is it applicable to the reservoir we are working on?
Is resistivity even the best method today??
Geoff(rey) Page is Baker Hughes Europe Region/Global Petrophysics Advisor based in Aberdeen. He began logging in France with “Dresser Atlas” (Now Baker Hughes) in 1980, and was one of the first members of the “International MWD Society” (Now merged into SPWLA) in the late 1980’s, and was President of the Aberdeen Chapter of SPWLA in 1988. For over 30 years Geoff has spent many weeks a year teaching Logs/Petrophysics to engineers, customers, and for several Msc courses at Aberdeen University and has introduced the topic to over 1500 people over the years. In 2019 he was awarded the SPWLA distinguished Technical achievement award at the Annual conference.
Title: The Petrophysics of Dielectric Permittivity at LWD Frequencies: Observations in a High-Permeability Sandstone Reservoir in the North Sea
Speaker: Scott J. Jacobsen, Vice President Interpretation Development, NoHiddenPay, LLC
Logging While Drilling (LWD) resistivity tools use electromagnetic propagation-resistivity measurements in formation evaluation to determine the water saturation of rocks. These measurements provide phase shift (PS) and attenuation (AT) from the signal ratio between a pair of receivers. As electromagnetic measurements in the frequency range from mid-100-kHz to low-MHz, they depend on both the dielectric permittivity and the electric conductivity of the surrounding medium. Traditionally, PS and AT have been independently converted to apparent resistivities where the dielectric permittivity was considered small enough to be replaced by a conductivity-based estimate.
This assumption of small dielectric permittivity proved to be not always valid. In some rock types with fairly high clay content and especially in some hydrocarbon-rich shales the relative dielectric permittivity could become large. In all formations however, dielectric permittivity shows a strong frequency dependence, which is called “dispersion”. An efficient and accurate inversion of any common type of axisymmetric LWD propagation resistivity tool has been recently developed and implemented to provide formation permittivity dispersion in this LWD frequency band. This allows petrophysical exploitation of these new, mid-frequency, formation properties.
Wireline dielectric tools, which typically operate in the high-100-MHz to low-GHz frequency range provide formation permittivity dispersion that is used to derive salinity-independent, water-filled porosity and formation resistivity factor in clean carbonates. We make use of a recently published wideband dielectric property model, and focusing on the new, LWD mid-frequency formation properties, we investigate the validity of deriving the same salinity-independent, water-filled porosity in shaly sands in a North Sea reservoir using 2 MHz formation permittivity at radial distances which far exceed the shallow investigation volume of the GHz measurements of just a few inches.
We also share observations of LWD band permittivity dispersion as it relates to characteristic dispersion provided by concurrent wireline low-frequency (26 kHz) induction tool and high-frequency dielectric tool permittivity and conductivity data in both conventional and unconventional types of reservoirs. We assert that wideband formation permittivity dispersion may be approximated by LWD band permittivity dispersion for practical operational and drilling efficiency, and will potentially open up a whole new set of opportunities for more petrophysical insight into controls on well productivity.
Scott J. Jacobsen is currently Vice President of Interpretation Development with NoHiddenPay LLC, in Houston. His primary focus is on resistivity and EM technology log modeling and interpretation, and subsequent application to well productivity. Prior to this, he spent 10 years as a Technical Expert –Petrophysics at Southwestern Energy, working with both exploration and then asset development teams in most U.S. unconventional plays, from Niobrara to Marcellus. He began his career with Schlumberger as a field engineer in 1975 and held many application development positions in the US, North Sea, and the Middle East, including Manager of Interpretation Development for North America. He retired from Schlumberger as a Petrophysics Advisor and as Petrophysics Domain Champion for the U.S. Scott is a member of SPWLA and SPE. He was co-author of an SPWLA Best Symposium Paper award in 1987 and was an SPWLA Distinguished Speaker in 1991 and in 2006. He has a BS in Electronics Technology from Northern Ill. U. and a BS in Electrical Engineering from the U. of Notre Dame.