papg may meeting taylor mcclain range resources strata are a 2nd-order transgression utica shale...
TRANSCRIPT
Introduction
Objectives
Study area and dataset
Geologic Setting
Sequence stratigraphy Present understanding
Cross-sections and interpretations
Regional maps
Petrophysics Passey TOC, density TOC
Regional TOC maps
Porosity and water saturation modeling
Hydrocarbon potential Normalized oil
Peak porosity
Initial production and percent liquids reported to date
Upper Ordovician black shale and limestone
Historic production dating to early 1900’s
Modern organic source-rock play
Vernon/Sandy Creek
Bluetail-Rooster
Albion-Scipio
Lima Indiana
Fractured interbedded play
Point Pleasant Play
Create a depositional model for the Utica-Point Pleasant interval in eastern OH and western PA.
Create stratigraphic architecture consistent between states
Correlate core data and wireline logs to calculate and map total organic carbon (TOC) and porosity.
Investigate relationship of high TOC intervals to sequence stratigraphy and basin structure
Identify prospective production fairways
Map geochemisty to determine source potential and maturity
Late Middle-Ordovician Paleogeography
N.E. North America situated 20-25°S latitude
Great American Carbonate Platform
Collision with island arc sets up Taconic foreland basin
Blakey, 2005, Northern Arizona Univ. Dept. of Geology; http://jan.ucc.nau.edu
Brett and Baird (2002)
Atypical foreland basin
Cross-strike lineaments create sub-basins
Sebree trough
Pennsylvania basin
Point Pleasant sub-basin
Normal faulting sets up Point Pleasant sub-basin
Organic marl deposited in sub-basin
Clean limestones on flanking platforms
N S
Point Pleasant
Lexington/Logana
Middle Utica
Lower Utica
Lexington Platform
Trenton Platform
M5
M6
C1
PPLN grades into Lexington platform carbonates
Utica downlaps, becomes less shale-rich
Lexington
N S
Lexington Platform
M5
M6
C1
Subsidence and relative sea level increasing
Trenton Platform develops
Gentle slope
Clean LS at edge, lagoonal facies behind
Sub-basins with marl
Sharp edge at platform
Water depth differences
Subsidence, relative sea level increase
Platform retreating
Sebree trough becoming apparent
Trenton-Utica strata are a 2nd-order transgression Utica shale marks maximum flooding surface
Four, 3rd-order sequences present (M5, M6, C1, C2)
Lowstand deposits absent, sequences separated by type 3 sequence boundaries
Amalgamation of the TS with the SB
Normal faulting along CSD’s creates steep paleo-topography, resulting in sharp facies changes
Upper Utica recognized to the north Younger than Utica shale in the south
Passey Method Porosity and resistivity respond to organic matter
Overlay logs, magnitude of separation proportional to organic content
Works best with sonic-logR, rhob-logR has two different baselines ΔLogR
0 1 2 3 4 5
LOGR - Log10(HLLD)
3
2.9
2.8
2.7
2.6
2.5
2.4
2.3
2.2
2.1
2
RH
OB
- B
ulk
Density
{F
13.4
}
0
10
20
30
40
50
60
70
80
90
100
110
120
130
140
150
160
170
180
190
200
GR
_U
TIC
A_N
RM
- GR
Utic
a N
rm L
og - c
ut fo
r Utic
a in
terv
a
6900
6950
7000
7050
7100
7150
7200
7250
7300
7350
7400
7450
7500
LOGR
(0-5)
RHOB
(3-2)
GR_UTICA_NRM
(0-200)
RHOB = 0.05359223*LOGR + 2.5384 StdErr=0.0967
WELL: 34029215930000 (1267 samples)
Utica Database - TMcClain
PETRA 12/19/2012 5:51:13 PM Plot Log10 of resistivity
Best fit line on non-organic rock (limestone)
Compute pseudo bulk density log (RhobR)
-0.2 -0.1 0 0.1 0.2 0.3 0.4
DELTRHOBR - Delta RHOBR - RHOB
0
1
2
3
4
5
6
7
8
9
10
CO
RE
_T
OC
-
0
10
20
30
40
50
60
70
80
90
100
110
120
130
140
150
160
170
180
190
200
GR
_U
TIC
A_N
RM
- GR
Utic
a N
rm L
og - c
ut fo
r Utic
a in
terv
a
CORE_TOC = 9.41689881*DELTRHOBR + 1.2086 Corr=0.819 StdErr=0.5379
91 Samples f or 5 out of 7 Wells
Utica Database - TMcClain
PETRA 3/1/2013 5:17:21 PM Calculate magnitude of separation between density and pseudo-density
Plot against TOC
Slope of line varies with LOM
0 1 2 3 4 5
LOGR - Log10(HLLD)
3
2.9
2.8
2.7
2.6
2.5
2.4
2.3
2.2
2.1
2
RH
OB
- B
ulk
Density
{F
13.4
}
0
10
20
30
40
50
60
70
80
90
100
110
120
130
140
150
160
170
180
190
200
GR
_U
TIC
A_N
RM
- GR
Utic
a N
rm L
og - c
ut fo
r Utic
a in
terv
a
6900
6950
7000
7050
7100
7150
7200
7250
7300
7350
7400
7450
7500
LOGR
(0-5)
RHOB
(3-2)
GR_UTICA_NRM
(0-200)
RHOB = 0.05359223*LOGR + 2.5384 StdErr=0.0967
WELL: 34029215930000 (1267 samples)
Utica Database - TMcClain
PETRA 12/19/2012 5:51:13 PM Plot Log10 of resistivity
Best fit line on non-organic rock (limestone)
Compute pseudo bulk density log (RhobR)
-0.2 -0.1 0 0.1 0.2 0.3 0.4
DELTRHOBR - Delta RHOBR - RHOB
0
1
2
3
4
5
6
7
8
9
10
CO
RE
_T
OC
-
0
10
20
30
40
50
60
70
80
90
100
110
120
130
140
150
160
170
180
190
200
GR
_U
TIC
A_N
RM
- GR
Utic
a N
rm L
og - c
ut fo
r Utic
a in
terv
a
CORE_TOC = 9.41689881*DELTRHOBR + 1.2086 Corr=0.819 StdErr=0.5379
91 Samples f or 5 out of 7 Wells
Utica Database - TMcClain
PETRA 3/1/2013 5:17:21 PM Calculate magnitude of separation between density and pseudo-density
Plot against TOC
Slope of line varies with LOM
Organic matter has low density
Trends strongly with bulk density log (r2=0.8)
2 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 3
RHOB - Bulk Density {F13.4}
0
1
2
3
4
5
6
7
8
9
10
CO
RE
_T
OC
-
0
10
20
30
40
50
60
70
80
90
100
110
120
130
140
150
160
170
180
190
200
GR
_U
TIC
A_N
RM
- GR
Utic
a N
rm L
og - c
ut fo
r Utic
a in
terv
a
CORE_TOC = (-21.34105257)*RHOB + 58.0943 Corr=-0.704 StdErr=0.8694
499 Samples f or 6 out of 6 Wells
Utica Database - TMcClain
PETRA 12/19/2012 5:11:16 PM
Organic-rich strata focused in sub-basin
Clean carbonates on platforms
Point Pleasant sub-basin
Trenton platform
Lexington platform
Very low Sw in Point Pleasant
Utica organic lean
Shallow-deep resistivity separation indicates perm
Sw Phi TOC Vclay/Vcarb
S1 - generated HC’s
S2 – Potential HC’s
S1 decreases into dry gas phase
Gaseous HC’s lost during sample recovery
Density shows strong correlation with TOC and porosity ΔLogR method based on maturity
Point Pleasant contains highest TOC and porosity, lowest Sw Utica Shale contains low organic strata
TOC concentrated in Point Pleasant sub-basin
Normalized oil content mapping shows source potential and thermal maturity
Peak porosity map identifies “sweet spot” PPLN thickness increases to the north
Porosity increases to the south
Larger production rates to the south Higher PPLN porosity
Utica Shale acts as a seal?