Magnetic Resonance Imaging Analysis (MRIAN)
| MRIAN is
an analysis technique that combines MRIL® and
conventional data to identify potential hydrocarbon
zones. MRIAN uses the dual-water model technique to
estimate the volume of formation fluids in a virgin
zone. Using the dual-water model within the MRIAN
program allows identification of free water volume.When
the computed effective volume of water equals the MRIL
irreducible volume of water, then production is water
free. T2 distributions and permeability calculations are
provided to indicate reservoir quality. |
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| MRIL
stand-alone analyses, such as TDA, DIFAN, and EDM™,
provide hydrocarbon typing interpretation within the
depth of investigation of the MRIL measurements. When
MRIL data is combined with other logs, analysis can
furnish even more information about the reservoir. MRIAN
is one of the interpretation models that use this data
combination. |
| » MRIAN Analysis Features |
| MRIAN
combines MRIL and deep-resistivity data from any
induction tool . MRIL data is used to provide two
important parameters needed in the dual-water model: The
clay-bound water porosity (MCBW) and total porosity
(MPHIT). |
| » MRIAN Analysis Benefits |
| MRIAN
Analysis offers the following benefits: |
- Enhanced permeability calculations
- Indicates zones of potential water production
- Identifies hydrocarbon-water contacts
- Calculates water saturation in the uninvaded zone
- A solution for low-resistivity pay reservoirs
- Confirms dual-water Rw by reconstructing spontaneous potential (SP)
- Uses a robust implementation of the dual-water resistivity model to provide improved water saturation (Sw) calculations, especially in shaly reservoirs.
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| The
MRIAN analysis indicates an oil/water contact at X940.
The MRI T2 distribution in Track 3
demonstrates a change in relaxation times verifying the
MRIAN analysis. |
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| Inputs |
MRIL porosity data.
The main data requirements for MRIAN processing are true
formation resistivity (Rt), total porosity
(φt), and clay-bound-water saturation
(Swb). Density, neutron, and/or sonic porosity are
optional inputs. MRIL activation planning is critical for
successful interpretation. |
| Outputs |
Permeability, Effective
Porosity, Total Porosity, Water Saturation, Free Water Volume,
Irreducible Water Volume |
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