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An exception might be made either if the uncertainty of the tool is being driven by a curve at least partly determined by hole rugosity, or if you very carefully zone the uncertainty parameter. A value of 1, or even lower, is common in high-porosity rocks of the Gulf of Mexico.
In tight formations for which this was developped actually very low prosity limestones! Shallow-reading log measurements are assumed to respond only to volumes of formation components in the X zone.
An advantage of setting Clay to Wet is that only one clay response parameter is needed for each equation. This results in a gas parameter value of Even though there are enough response equations to solve for the number of formation components, which tool would be responsible for the orthoclase? Any interpretation system—and the ELANPlus system is no exception— must know the volume and type of hydrocarbon in the flushed zone in order to make the proper hydrocarbon corrections especially gas corrections to the porosity measurements.
What is the “archive” directory? How do I gain a volume between two horizons, using a geeoframe varying multiplier? All water response parameters should be set to Step 4 Choose Constraints If you wish to restrict the volume space available in the solution, you may wish to set some constraints. Parameters are the global and program control parameters, response parameters, binding parameters, and salinity parameters.
Singe-well ELANPlus can be run anytime after preliminary data editing such as patching, depth matching, environmental correction is complete. Use the appropriate formation water salinity or resistivity to compute those parameters with the Parameter Calculator.
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Occasionally, the subscript WC will be used to emphasize that a particular parameter or volume is a wet clay value. To be totally out of the solution, the equation must be removed from the model Solve process.
Schlumberger makes no warranties, express, implied, or statutory, with respect to the product described herein and disclaims without limitation any warranties of merchantability or? It assumes that the hydrocarbon density in the flushed and undisturbed zones is the same. Two against one in an optimized solution will have an answer weighted towards the two tools that agree no gas.
Instead you will settle for a model, a subset of reality.
DUG Insight User Manual
At every depth level if any response equation in the process is nonlinear. When a zone boundary is created for one response parameter, it will exist for all response parameters. Experience has shown that it is a good idea to write a constraint to force the volume of water to be greater than about 0. Using t and v to compute R is called the amnual problem.
Generally, equation or response equation will be used when the intent is to focus attention on the structure of the equation. The volume summation equation has a range of 0 to gfoframe.
The derivation is presented below. You can also de? Help, Insight just crashed! Such an approximation is valid only over a specific manuzl of porosities and fluid saturations. Note that the inverse problem solves for formation component volumes only. Never apply a constraint for the sake of aesthetic effect. You can run the ELANPlus application and produce results—even meaningful results—without the information presented in this document.
The mdw has a default value of 1. The minerals are a simple sum of the manuak times the endpoints. Also, some users would rather work with laboratory-established values for tool uncertainties. Rocks do not have default parameter values other than Absent. Therefore, some other tool must accurately resolve the clay volume in order to quantitatively distinguish between gas and oil.
The equations describe the logging data and supplementary response equations that are available. How do I perform an amplitude extraction at different angles through the volumes? One equation, which is always in effect, forces the sum of all volumes to 1. Tool will be used more conceptually in discussing interpretation models.