NMR Data Processing Using Gamma Functions for the Evaluation of Heavy Oil Reservoir in the Peregrino Field
- Katherine Klein (Equinor) | José Barbosa (Equinor) | Jesus Pastor Salazar (Baker Hughes) | Javier Borri (Baker Hughes) | Roberto Arro (Baker Hughes)
- Document ID
- Society of Petroleum Engineers
- SPE Latin American and Caribbean Petroleum Engineering Conference, 27-31 July, Virtual
- Publication Date
- Document Type
- Conference Paper
- 2020. Society of Petroleum Engineers
- 5.2 Reservoir Fluid Dynamics, 1.6 Drilling Operations, 1.12.2 Logging While Drilling, 1.12 Drilling Measurement, Data Acquisition and Automation, 1.2.3 Rock properties, 5.2 Reservoir Fluid Dynamics, 5.1 Reservoir Characterisation
- petrophysics, Heavy Oil, Offshore, Gamma Inversion, NMR
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The use of Nuclear Magnetic Resonance (NMR) logs for petrophysical interpretation and evaluation in the oil and gas industry has increased in recent decades, especially in Brazil, where the use of this technology was increased by more than 400% from 2011 to 2018 (from 49 to 208 runs). This increased usaged occurred mainly because the porosity estimation provided by this technology is independent of lithology. Additionally, the porosity can be associated with different pore sizes. It can also be divided to quantify the fraction of porosity for the clay bound water, bound fluid by capillary forces and movable fluid by applying cutoff times in the spectrum of T2 distribution.
Nevertheless, the presence of heavy oil in the Peregrino reservoir, with oil viscosities ranging varying from 150 to 350 cP, complicates NMR interpretation because the signal from the oil decays with a time constant that is comparable with that of capillary or clay-bound water, affecting the determination of permeability and the fluid distribution.
This paper presents the results of applying innovative Gamma Inversion to process the logging-while-drilling (LWD) NMR data acquired in a well from the Peregrino Field, offshore Brazil. The Gamma Inversion process uses probabilistic functions, instead of exponential ones, to generate a T2 spectrum that is more consistent from a mathematical and geological point of view.
|File Size||1 MB||Number of Pages||16|
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