The SPWLA Permian Basin Chapter
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Tuesday, May 24 11:50 - 1:00 PM CDT
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"Integrated Petrophysical Evaluation of Unconventional Formations, in the Delaware Basin,
With a Customized NMR Acquisition."
Mohammed Azeem Chohan
Unconventional shale reservoirs have
complex lithology, porosity and fluid systems where hydrocarbons are stored in
both inter- and intra-particle pores. Hence, conventional log measurements and
petrophysical techniques often fail to provide a consistent analysis for key
petrophysical properties such as porosity and hydrocarbon saturation.
Nuclear magnetic resonance (NMR) logging
has gained an importance in unconventional resource evaluation, for its promise
to allow in-situ differentiation of various fluid phases and their
potential to flow. However, in unconventional reservoirs, pore sizes may range
from only a few nanometers to a few hundred micrometers: in these small pores
the NMR signal relaxes rapidly, making it challenging to measure using standard
NMR acquisition modes and methodologies.
This paper introduces a custom NMR log
acquisition mode that is designed to measure these fast-relaxing components, to
improve porosity identification and fluid typing in unconventional shale
reservoirs. This is implemented through both tool improvements and novel
processing techniques in the T2 and T1-T2
logging modes. Furthermore, the methodology can optionally incorporate other
conventional and advanced measurements (such as, elemental spectroscopy, and
multi frequency dielectric) as part of an integrated system to further
constrain and compute key petrophysical properties.
The methodology was applied to the Bone
Spring and Wolfcamp formations of the Delaware Basin, integrating the NMR data
with open hole log data, including density, porosity, and total organic content
from elemental spectroscopy logs to identify organic rich zones. Integration of
multifrequency dielectric measurements further increases confidence in
estimating water filled porosity and hydrocarbon saturation within the
reservoir. This methodology results in improved quantification of key reservoir
properties such as porosity and hydrocarbon saturation.
Compared to existing methodologies,
benefits include increased logging speed, therefore saving rig time, improved hydrocarbon typing and
quantification, and the ability to integrate with laboratory-based
measurements, advanced logging suites and cuttings analysis to better identify
and quantify productive zones.
We present a case study applying the new
NMR acquisition mode and demonstrating the improvements in quantification of
the reservoir properties.
Mohammad Azeem Chohan is a Petrophysicist at Baker Hughes.
He joined the Reservoir Technical Services team in 2013 after graduating from
University of Houston with a B.S. in Geophysics. He also attained a Master of
Engineering in Petroleum Engineering from Texas A&M University in 2019. His
experience includes open hole formation evaluation and geomechanics as well as remote
monitoring of real-time drilling operations.
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Permian Basin Chapter of the SPWLA
Next Meeting: August 23, 2022
Monthly Meetings: 4th Tuesday of Most Months
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President: Veronica Montoya ([email protected] )
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Secretary: Violeta Flores ([email protected])
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PermianBasin at spwla.org