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Carbonate Advisor
CBA -
Description
Description -
Details 1 - Details 2
- Online Demo -
| The Carbonate Advisor CBA is a well log
interpretation program for analyzing well logs from carbonate formations.
CBA was developed by The Logic Group and Dr. George Asquith an expert in
carbonate analysis. CBA is designed to help analysts with their
interpretation including determining the lithology, computing porosity,
estimating pore type, selecting a variable m model based upon pore type or
computing m based upon porosity-m correlations from core data, computing
water saturation, and determining net pay thickness based upon user
specified cut-offs. CBA is designed to be a flexible
program and can be used with a variety of well log suites ranging from
modern logs to old electric logs. Core data can also be utilized when
available to provide por-m correlations and to compare log derived porosity
values with lab porosities. |
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| Important to all carbonate reservoir
evaluations is an accurate estimate of lithology. To estimate lithology
several crossplots are available: dual lithology, tri-lithology (MID plot
and M+N crossplot) and the PE crossplot from the lithodensity log. In each
crossplot the lithology lines or mineralogy points are provided. Depth
intervals can be highlighted to see where that data appears on the
crossplot. Porosity calculations can be done from the lithology
crossplots after the lithology is specified. CBA
provides many crossplots to aid users in gaining insight into their
reservoirs. The neutron-density crossplot indicates if a gas zone is gas
bearing. Several plots are used to distinguish a hydrocarbon bearing zone
from a wet zone. Each of the crossplots includes notes from Dr. Asquith
which explain why data falls in various regions of the plot. |
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| Besides these crossplots, several crossplots
are provided to aid users in determining if the pore type is
intercrystalline/intergranular, fracture, vuggy, or bimodel. For each plot a
color key presents how the pore types are shaded. Because each plot shows
the various pore type differently, a review screen summarizes the results of
all graphs and selects the most likely pore type for each depth as indicated
by the crossplots. Once pore type is selected, users
choose to compute m (the cementation exponent used in Archies' equation)
from different models, or input m or use core derived values. A m-por
transformation can be obtained from core data using linear, power or
exponential curve fits. |
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| The m values and water saturations from
Archie's Equation, Ratio Method, and Carbonate Method (Archie's Equation
with a variable m) are computed and displayed. Users can compute a net pay
thickness from user specified cut-offs and obtain average formation results.
CBA is menu driven with instructions appearing on-screen.
Technical notes are provided including discussions about crossplots and
equations. CBA provides a step-wise procedure whereby well logs from
carbonate reservoirs can be analyzed quickly and accurately. CBA runs on
Windows computers and is available from The Logic Group |
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Description - Flow Chart -
Details 1 - Details 2
- Online Demo -
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