NDLI: Applications of 2D-NMR maps and geometric pore scale modeling for petrophysical evaluation of a gas well

Content Provider	Springer Nature Link
Author	Romero, Pedro Gladkikh, Mikhail Azpiroz, Guillermo
Copyright Year	2008
Abstract	This paper presents the petrophysical evaluation of a gas reservoir from the Gulf of San Jorge basin, Argentina, by means of two-dimensional nuclear magnetic resonance (2D-NMR) maps and a geometric pore scale modeling of the NMR response of the wetting phase. The reservoir contains gas and irreducible water saturation at the top with a sharp transition into the water zone. The well has been logged with conventional tools such as gamma ray, neutron, density, and also the MRExplorerSM (MREXSM) to acquire the NMR data for determining the irreducible water saturation. Data from special core analysis, scanning electron microscopy, thin sections, and capillary pressure tests have also been acquired. The core-log evaluation shows a very good agreement between the laboratory and log field data, especially in terms of irreducible water saturation, porosity, and permeability, which was also modeled using the Timur–Coates equation for purposes of field delivery. The 2D-NMR maps as T1 vs. T2 apparent (T2app) and diffusivity vs. T2 intrinsic (T2int) from both hydrocarbon and water zone lead to characterize the clay-bound and capillary-bound water and the under-called porosity due to the low hydrogen index of the gas. We use a pore scale model to quantify the effect of pendular water on T2 distribution. The methodology is based on constructing physically representative model rocks numerically, which allows precise geometric description of pore space. Unlike many other approaches to pore-level modeling, this approach introduces no adjustable parameters and can be used to produce quantitative, a priori predictions of the rock macroscopic behavior.
Starting Page	171
Ending Page	180
Page Count	10
File Format	PDF
ISSN	14200597
Journal	Computational Geosciences
Volume Number	13
Issue Number	2
e-ISSN	15731499
Language	English
Publisher	Springer Netherlands
Publisher Date	2008-09-03
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	NMR logging T1 T2 Diffusivity Pore scale modeling Gas reservoir Pendular water Mathematical Modeling and Industrial Mathematics Soil Science & Conservation Hydrogeology Geotechnical Engineering
Content Type	Text
Resource Type	Article
Subject	Computers in Earth Sciences Computational Theory and Mathematics Computer Science Applications Computational Mathematics

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