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Services >Well Data Analysis >Conventional Data Analysis
Conventional Data Analysis

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.

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.
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.
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.
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.
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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