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SCRIPT OVERVIEW
Crain’s
Petro/Fusion Scripts
comprise a set of log analysis algorithms
based on Chapters 10
through 17 of Crain’s Petrophysical Handbook. The code covers
conventional and organic-rich oil and gas reservoirs, bitumen
bearing oil sands, and mechanical rock properties for
stimulation design and seismic attribute analysis.
QUICK
FACTS:
Item #PF-00:
9 code script modules in text format, plus Overview and List of
Abbreviations
Bonus Feature: Item #RF-01 Crain’s Petrophysical Pocket Pal with
algorithm usage rules, numerical examples, 10 real-world examples.,
Crain’s Petro/Fusion Scripts
are written with the syntax used in GeoGraphix Prizm User
Defined Equation language. With some careful find-and-replace
commands, this code can be converted to Python or Java, or added
to commercial software like PowerLog or any other package that
supports user defined equations.
To use
Crain’s Petro/Fusion Scripts
as user defined equations in commercial software, load the
scripts, fix any syntax issues, declare variables as required,
and test carefully.
To write your own program, you will need to do some or all of
the following:
1. Declare data types as log curve or as single-valued
parameter.
2. Create an equivalent to the “isNull(XXX[])” function used in
these scripts.
3. Create parameter-value and logic-switch interface with
defaults and definitions.
Go to
www.spec2000.net/downloads/SPR-04-META-LOG-ESP-Advanced-Log-Analysis-Oil-Gas-Metric-English.xlsx
to see an example executed in Excel. This spreadsheet is a
working model with all the analysis models in
Crain’s Petro/Fusion Scripts.
4. Parameters and logic switches apply to a single depth
interval, eg. IntervalTop to IntervalBase. If you need different
parameters or logic for another interval, you will need to
create a code overlay for interval zoning and an interface for
that purpose.
Crain’s Petro/Fusion Scripts
span the most common petrophysical analysis models but do not
include LAS file input, output, or management, depth plot or
crossplot support, or a run-time
environment.
Put
my 50+ years of practical world-wide petrophysical experience to work for
you!
License:
Single-User •
Corporate •
Academic
SCRIPT CONTENTS
MODULE 09 - Overview
MODULE 01 – Data Housekeeping CPH Chapter 7
MODULE 02 – Shale Volume CPH Chapter 11
MODULE 03 – Effective Porosity CPH Chapter 12
MODULE 04
– Organic Rich Reservoirs CPH Chapter 17
MODULE 05
– Lithology CPH Chapter 13
MODULE
06 – Water Saturation CPH Chapters 5 and 14
MODULE 07 – Permeability CPH Chapter 15
MODULE 08 – Mappable Properties CPH Chapter 16
MODULE 09 – Mechanical Properties / Closure Stress CPH Chapter
10
MODULE 10 – List of Abbreviations
SCRIPT SAMPLE
; Shale volume from gamma ray - linear model
;
IF (IsNull(GRcor[]==1) OR runVshg = 0)
Vshg[] = 1
ELSE
Vshg[] = min(1, max(0, (GRcor[] - GRcln) / (GRshl - GRcln))
END IF
Crain’s Petro/Fusion Scripts
contain many IF statements that handle English and Metric
units, missing data, user-selected algorithms options, and
internal logic based on the author's long experience in
petrophysics and software development.,
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