AFES MONTHLY MEETING
Free entry to meeting and a wine buffet following the meeting
Date: Wednesday 14 January 2004 at 6:00pm
Venue: Lecture Theatre 1
Department of Geology
Meston Building, University of Aberdeen
Speaker: Simon Stromberg (Reservoir Management Ltd)
Title: Understanding NMR Logging in Carbonate rocks: Use and Application of the Carbonate NMR rock Catalogue and Innovative Techniques of Forward Modelling Log Response
Abstract: Strategies for the evaluation of sandstone pore space geometry using nuclear magnetic resonance (NMR) and special core analysis are well founded. Such studies on carbonate pore systems are rare. The ResLab ART NMR carbonate rock catalogue was established to provide an extensive database of rock properties for a wide range of carbonate rock types. The catalogue includes NMR T1 and T2 distributions on saturated and de-saturated samples, mercury injection and image analysis data and basic petrophysical parameters.
Examples from the database are presented with special reference to the problems encountered in NMR measurements on carbonates. The relative merits of using whole core and plug scale samples for NMR measurements will be evaluated. The effect of diffusion and paramagnetic minerals on NMR measurements within carbonates is also discussed.
Combining the carbonate rock catalogue with innovative forward modelling techniques allows NMR response for different logging tools and different reservoir hydrocarbon saturations to be evaluated. The modelling techniques include fluid substitution and synthetic log data generation. The synthetic data can be produced to replicate specific logging tools, acquisition sequences and signal to noise. Using synthetic data allows the impact of signal-to-noise and acquisition parameters to be evaluated. In this paper we will outline the principals of forward modelling and demonstrate the use of the carbonate catalogue in developing forward models for the understanding and interpretation of NMR logs in carbonate rocks.
Presenter: Simon is Senior Petrophysicist with Reservoir Management Ltd. Prior to this he worked as Senior Petrophysicist with Paradigm Geophysical, based in the Middle East. He has also worked on the development of NMR processing and interpretation software. Specialist interests include NMR logging, NMR SCAL, saturation height functions, optimising systems in petrophysics and LWD/MWD geo-steering applications.