American Oil and Gas Reporter - January 2021 - 82

Tech Trends 2021
31% of the 10-foot core interval. Carbonate-dominated lithotypes form 24.9% of
the ditch-cutting interval, which again is
a very close match with the core. It is important to note that in both of these example intervals, the dominant mineral
does not correspond to a comparable proportion of that end member.
For instance, Interval 2 has an average
carbonate volume of 50.1%, but most of
the carbonate is portioned into " limestone " lithotypes that form only 24.9% of
the interval. These observations can have
important implications for the geomechanical behavior of the formation in
terms of fracture propagation and how
the thickness, composition and lateral
continuity of these brittle carbonate beds
vary along lateral well stages.
As illustrated in the Midland Basin application, there are strong benefits of de-

lineating lithotypes from cuttings intervals. The end-user has the capacity to
evaluate the distribution of minerals
within each lithotype, allowing for a dynamic evaluation of reservoir parameters
(e.g., clay/carbonate volumes or image
porosity) when new rock types are encountered in a well. This significantly increases the accuracy of the reservoir
description in comparison with alternative
techniques, which are confined to simply
(homogenized) bulk mineralogy values.
Second, incorporating lithotype distribution in zones where wireline log data
underappreciates the formation heterogeneity (as a result of thin bed effects, for
example) can lead to a more accurate appraisal of net reservoir within any given
well or interval. Reservoir models built
from petrophysical logs alone could lead
to upscaling of errors, affecting volumet-

ric calculation by over- or underestimating reserves within a field. A good coreto-cuttings calibration utilizing this
lithotyping approach enables an operator
to run multiple wells within a field and
build their reservoir maps on the basis of
a consistent and comprehensive rock-calibrated petrophysical model.
Ultimately, the ready availability of
cuttings from all wells, combined with the
application of this workflow, allows for
consistent objective lithological description of subsurface formations. The lower
cost of cuttings analysis, compared with
log collection, also allows for the cost-effective generation of a detailed lithological database from cuttings. This database
then becomes an effective tool in mapping
and interpreting the spatial reservoir quality of a target formation and allows for
more informed landing zone decisions.❒

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American Oil and Gas Reporter - January 2021

Table of Contents for the Digital Edition of American Oil and Gas Reporter - January 2021

Contents
American Oil and Gas Reporter - January 2021 - Intro
American Oil and Gas Reporter - January 2021 - Cover1
American Oil and Gas Reporter - January 2021 - Cover2
American Oil and Gas Reporter - January 2021 - Contents
American Oil and Gas Reporter - January 2021 - 4
American Oil and Gas Reporter - January 2021 - 5
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American Oil and Gas Reporter - January 2021 - Cover3
American Oil and Gas Reporter - January 2021 - Cover4
https://www.nxtbook.com/nxtbooks/aogr/202404
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https://www.nxtbook.com/nxtbooks/aogr/pbios2014_programguide
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