Naser Tamimi

Reservoir Characterization Project, Colorado School of Mines, Golden, CO

SIGMA3 (Sigma Cubed Inc.), Englewood, CO

November 2015

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CORRELATION BETWEEN ELECTRICAL RESISTIVITY AND ANISOTROPIC ELASTIC PROPERTIES OF PIERRE SHALE,

WATTENBURG FIELD, COLORADO

Case Study

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3

WATTENBERG FIELD

*

Geology

The Wattenberg Field is located in NE of Denver.

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MAP VIEWCROSS SECTIONVIEW

Top of the Niobrara Fm.

39.7 m

PIER

RE SH

ALE

VSP well

Methodology

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Methodology

q (vertical slowness)from Δt

ψ (polar polarization angle)

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Vibroseis

Polarization angle (ψ)

Ver

tica

lslo

wn

ess

(q

)

q (vertical slowness)from Δt

ψ (polar polarization angle)polarization

angle

7

Vibroseis

Polarization angle (ψ)

Ver

tica

lslo

wn

ess

(q

)

Methodology

q (vertical slowness)from Δt

ψ (polar polarization angle)polarization

angle

8

Vibroseis

Polarization angle (ψ)

Ver

tica

lslo

wn

ess

(q

)

Methodology

q (vertical slowness)from Δt

ψ (polar polarization angle)Ver

tica

lslo

wn

ess

(q

) model: m={δ, η}

Polarization angle (ψ)

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Vibroseis

Methodology

q (vertical slowness)from Δt

ψ (polar polarization angle)

m={δ, η}

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Joint Slowness-PolarizationMethod (JSPM)

Vibroseis

S-wave data

P-wave data

Ver

tica

lslo

wn

ess

(q

)

Polarization angle (ψ)

Anisotropy parameters δ and η

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Z-axis

VTI modelCijs are stiffness coefficients.

(Alkhalifah and Tsvankin, 1995)

(Thomsen, 1986)

Synthetic DataResults

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Improvement

Improvement

13

SE VerticalSymmetry Plane

MAP VIEW

JSPM Results

Results and Discussion

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Correlation between the estimated anisotropy parameter η and well logs

Ab

solu

te Valu

e of C

orrelatio

n

High Correlation

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Correlation between the estimated anisotropy parameter η and resistivity log

PIE

RR

E SH

ALE

FO

RM

ATIO

N

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Fabric vs. Concentration

Alignment of elements is important.Amount of elements is also important

Alignment of elements is NOT important.Amount of elements is important

Electrical properties

Elastic properties

Permeability

Radioactive properties(Gamma log, neutron log) Porosity

Density

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1. Using the joint P- and SV-wave slowness-polarization method (JSPM)

and borehole seismic data, I could determine anisotropic properties

of Pierre shale more precisely.

2. Comparing anisotropic properties (derived from seismic data) with

well logs showed a high correlation with resistivity logs.

3. Rock fabric properties are highly correlated and they could be good

source of information for confirming each other.

CONCLUSIONS

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End .

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