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Services >Well Data
Analysis >Conventional Data Analysis |
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Conventional
Data Analysis |
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SAND
SAND is a
log analysis program specially developed for the evaluation
of sandstone and shale-sand formations. SAND is not
applicable to those formations with a more complex lithology.
SAND utilizes
a neutron-density crossplot technique to determine clay
volume and porosity. Shale volume is evaluated by using
selected multiple indicators. Appropriate corrections
are made for the presence of light hydrocarbons.
Water saturation
is evaluated by using one of six saturation equations.
Absolute permeability is predicted by using one of four
relationships.
In addition,
hydrocarbon type is identified by evaluating hydrocarbon
density. Coal beds are identified, marked and analyzed
volumetrically by using a cross-plot technique. The SAND
program is a gas indicator and it can evaluate
clean and moderate shale-sandstone reservoirs, as well as
compute and present effective porosity, water saturation,
permeability, and clay and silt content. |
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CRA
CRA derives formation
components and their relative volumes from the data
recorded by downhole instruments and the parameter
input for modelling. The combination of several types
of data is required to accurately determine these components.
The solution of two minerals, shale, porosity, water
saturation, and hydrocarbon saturation requires data
from at least two porosity devices, a resistivity log,
and optionally, one or more shale indicators.
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DipAns
DipAns is a program that displays
diplog data graphically, and computing and displaying
formation geometric parameters from the displayed button
curves. The parameters that can currently be computed
are the dip magnitude and the azimuth of bed and fracture
planes.
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LES
Shaliness, porosity, mineral
composition of the matrix and fluid saturation can be
evaluated with LES. Several mineral volumes are calculated
when enough information is available.
LES utilizes statistical methods to estimate petrophysical
properties such as porosity, fluid saturation,
shale contents and several mineral volumes. |
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HWAS
HWAS (Horizontal Well Advisory
System) utilizes a minimum curvature method to calculate
the vertical depth, displacement in the east and west
directions and in the north and south directions,
and the offset in the horizontal direction. Vertical and horizontal
profiles can be drawn with these results as deviation and
azimuth data. |
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WfPro
An acoustic waveform is
a combination of a number of different wave types with
varying frequencies. Some of these wave types are unwanted
noise and may obscure wave types of interest. Generally
acoustic waveform data should be filtered.
The WfPro is used to analyze
all wave data. The slowness of compressibility, shear,
and Stoneley wave can then be used to obtain amplitudes
for energy analysis and to calculate rock strength and rock
properties, porosity, synthetic seismograms and hydrocarbon
indications. |
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