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Magnetic Resonance Imaging Logging, development and evolution as a fundamental evaluation tool in the reservoir management. Ron Cherry, Maged Fam and Emiliano López. Geological & Reservoir Overview. Formation Evaluation Problems

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slide1

Magnetic Resonance Imaging Logging, development and evolution as a fundamental evaluation tool in the reservoir management

Ron Cherry, Maged Fam and Emiliano López

slide2

Geological & Reservoir

Overview

Formation Evaluation Problems

High uncertainty in reservoir evaluation using conventional Log Analysis, due to:

  • Multilayer reservoirsmade up of an average of 20 stacked layers, about 5 mt. each.
  • Low formation water salinity
  • Several water/oil and gas/light oil contacts randomly distributed throughout a rock column of 1000 mts. (average 1500 to 2500 mts.)
  • Complex lithology (shaly and tuffaceous sand reservoirs)
  • Different hydrocarbon types
slide3

Core Porosity vs Permeability

Permeability (md)

Porosity (%)

Permeability (md)

Porosity (%)

Core measurements on samples from about 60 wells, 800 samples from San Jorge Basin

slide4

Matrix Density Distribution in so called “Sandstone” from San Jorge Basin

Grain Density Vs Core Porosity

Grain Density (G/c3)

Core Porosity (%)

slide5

Core Porosity Vs MRI Core Porosity

Core Porosity (%)

MRI Core Porosity (%)

MRI Core Porosity vs. Core Porosity

San Jorge Basin

slide6

Geometric Mean T2 Cutoff Vs. Depth

Depth (m)

Geometric Mean T2 Cutoff (ms)

Geometric Mean T2 Cutoff vs. Depth

The high degree of variation in the T2 cutoff range may cause some inconsistencies in the final Interpretation.

Thus the SBVI method is a better technique for determining BVI.

slide8

Core Permeability and MRI Permeability Models Vs Depth

Depth (m)

Core Permeability and MRI Permeability Models (md)

Core Permeability and MRI Permeability Models

Vs Depth

N.B.: MRI Permeability data is based on SVBI model

slide9

MRI Permeability Models Vs Core Permeability

Core Permeability (md)

MRI Permeability Models (md)

Core Permeability Vs MRI Permeability Models

N.B.: MRI Permeability data is based on SVBI model

slide10

MRIL Life Cycle

Met reservoir

Objectives

Specify Objectives

Reservoir Properties &

Problems

Borehole

Conditions

Size, mud, temp….etc

Test Results

Yes

MRIL

Pre-job

Planning

Compare

No

Data

Processing

&

Interpretation

Activation

Selection @

Logging speed

Prognosis

Selection of Zones

to Test

STIMRIL

Field Log

QC

Resistivity

log

Core Analysis

if available

slide11

water

oil

gas

water

oil

gas

oil

water

MRI Forward Model

Tool Physics

Acquisition Parameters

G, TE, TW

MRIL

Forward

Modeling

Planner

Expected Fm. Fluid

Properties

Temp., Pressure &

Viscosity

Mud Properties

Borehole Size

slide12

Petrophysical Solution!!!

MRI Specific Acquisition and

Interpretation Techniques

“one logging pass”

EDM

Enhanced Diffusion Method (Hydrocarbons 2-50 cp)

TDA

Time Domain Analysis (Hydrocarbons < 2 cp)

slide14

ShortTE

LongTE

MRI Prognosis:

Heavy OIL

1800 L/H

75 % SW

MRI Prognosis:

Water

2400 L/H

100 % SW

slide15

How can we distinguish

Heavy OIL from Water ???

Special Design for Heavy OIL detection…

MRIL Ultra Long TE Activation

slide16

ShortTE

LongTE

UltraLongTE

MRI Prognosis:

Heavy OIL

1800 L/H

75 % SW

MRI Prognosis:

Water

2400 L/H

100 % SW

slide17

ShortTE

LongTE

UltraLongTE

Heavy OIL Detection Example

Initial Test Result (8hs Swabbing): 2400 L/H – 100% SW

Final Test Result (24hs Swabbing): 2400 L/H – 88% SW

slide18

Halliburton Question regarding details on test results

Dear Customer:

“…If We understand well, the formation was producing water for 8 hours before starting to produce Oil …??

You have insisted to keep it producing because there was a very good signal on the MRI Ultra-Long Te activation,….. Is that correct …??...”

Customer’s response

“It\'s correct...It has been a very good news today, because up to yesterday, we couldn\'t believe that from that signal it would be only water... We insisted and it was 2400 l/h x 88% of water (may be the amount of water would have declined if we would wait more time... but for us it was enough seeing some oil)…”

slide19

Fluid Typing: Light OIL

Shot-Te/Long-Tw

TDA

EDM

Long-Te/Long-TW

Dif. S.-Te/L.TW-S.Tw

MRI Prognosis

Light Oil w/ HGOR

Composite Log MRI Interpretation EDM + TDA

Flow

920 L/H

40 % SW

slide20

Fluid Typing: GAS

MRI Prognosis

Light OIL

MRI Prognosis

GAS

Flow x 12mm

Wet GAS

P/D 280psi

P/E 1560 psi

MRI Prognosis

GAS

conclusions
Conclusions
  • Magnetic Resonance Imaging (MRI) Logs as a fundamental evaluation tool in the reservoir Management
  • Determination of Porosity, Independent to Matrix
  • Determination of Bulk Volume Irreducible Water
  • Reliable Permeability Indicator (absolute after Calibration)
  • Identify Fluid Type (Gas, Oil & Water) by zone
  • Identification of Rock Quality…Permeability, Porosity & Clay
  • Determine variations of Hydrocarbon types (Resistivity independent)…
  • …Heavy, Intermediate, Light Oil or Gas
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