Upload
gunner-paskett
View
221
Download
0
Tags:
Embed Size (px)
Citation preview
Integration of Core and Log Petrophysics: Case Studies in the Mississippian of Kansas
John H. Doveton
Mississippian Play in Southern Kansas
Spivey-Grabs Basil is the largest Mississippian oil field in Kansas with 69 million BO & 850 BCFG
Gerlach, Sept. 2011
Spivey Grabs example: McCoy #1 Cornelius
McCoy #1 Cornelius
McCoy #1 Cornelius
McCoy #1 Cornelius : CyberlookMcCoy #1 Cornelius : Cyberlook
High BVW : typical for commercial production in the Mississippi “Chat”
McCoy #1 Cornelius
The beginning of “Chat” petrophysics
Jack Duran (Shell) 1960
Duren (Shell) 1960:
“Chat” core samples from Glick Field
Porosity range: 30 – 50%
Cementation exponent, m:
Average: m =2.36 (range: 2.24 – 2.73)
Saturation exponent, n = 1.8
PERFORATED PERFORATED 4370 – 4385 4370 – 4385 IPP 63.5 BOPD IPP 63.5 BOPD + 40 MCFGPD + + 40 MCFGPD + 43% WTR43% WTR
McCoy #1 Cornelius
More on “Chat” petrophysics
Watney, Guy, and Byrnes (KGS)
2001
Watney, Guy, and Byrnes (Bull. AAPG, 2001)
General Atlantic #A1 Tjaden
Watney, Guy, and Byrnes (Bull. AAPG, 2001)
“Context petrofacies” in Tjaden :
Lithofacies + position in cycle as related to paleoperched water table?
Watney, Guy, and Byrnes (Bull. AAPG, 2001)
General Atlantic #A1 Tjaden
Conversion of m into a profile of non-connected porosity from Watfa-Nurmi equation
THE WAY FORWARD?
• Software : saturation-height function modeling
• Hardware : more logging tools (NMR, EPT, ….)
Capillary pressure
curves
Duren (1960)Duren (1960)
Watney et al (2001)
HELPFUL ADDITIONAL LOGGING MEASUREMENTS?
• Magnetic resonance (NMR/CMR/MRI)
Pore-body size distribution
• Dielectric properties (EPT)
Water volume evaluation
- variable m
KGS #1-32 Wellington
Siliceous karst breccia (cave fill?) 3660- 3670 above siliceous dolomite
KGS #1-32 Wellington :
Match of core porosities with MRI effective porosities
KGS #1-32 Wellington :
Mississippian core porosities and grain densities
a*[ ]k = 2
nmr( )FFI
BVI
2Timur-Coates equation
FFI = Free fluid index BVI = Bulk volume irreducible nmr = FFI + BVI
SDR equation
b*[ ]k = 2
nmr( )2
logavT2
MRI estimation of permeability
KGS #1-32 Wellington :Prediction of permeability based on MRI porosity and SDR equation versus core Kmax, K90, and Kvert permeabilities
KGS #1-32 Wellington: The Mississippian section
3927- 3939: olive gray, argillaceous dolomitic siltstone; 50% silt; wispy shale laminations; indistinct bedding; faint discontinuous laminations; gradational contact
3939-3975.6: medium dark gray; very argillaceous dolomitic siltstone; faintly laminated irregular; 30% silt; 3972-3973 cm-sized irregular calcareous nodules/coarse calcite; faint lenticular bedding alternating olive gray and medium dark gray
3975.6-3993: very dark greenish gray; shale; tight; dolomitic; around 20% silt; scattered black shale laminae; uniform; scattered pyrite; 3983 starts increasing silt; gradational contact
PIERSON LIMESTONE : “Dark Cowley Facies”
“The Pierson Formation”
KIMELEON spectral GR image of the Pierson – addition of thorium, uranium, and potassium
The Bindley Field – Warsaw dolomites - 3.5 million barrels oil
Gerlach, Sept. 2011
Moving northwards to Hodgeman County …
Radiation-Guard
(RAG)logsfor Oasis #1
Deutsch,Bindley
field, Hodgeman
County, Kansas
From Ebanks et al (1977)
DRILL-STEM TESTS:
DST #1: 4603 – 4641
480 feet GIP, recovered 3300 feet oil, no water
DST #2: 4641 – 4694
60 feet GIP, recovered 690 feet very heavily oil & gas-cut muddy water, 60 feet oil-cut water, 60 feet water
PRODUCTION
Perforated: 4616 – 36
IP : 205 BOPD, No water
Oasis #1 Deutsch NE-SE 33-21S-24W Hodgeman County, KansasSummary of Meramec core (modified after Reed Johnson, 1990)
Mississippian core porosities and permeabilities from Oasis #1 Deutsch NE-SE 33-21S-24W Hodgeman County, Kansas
(modified after Reed Johnson, 1990)
Stratigraphic cross-section of the Bindley Field perpendicular to the long-axis, with Oasis #1 at the center. The distribution of lithotypes dictates the flow-unit architecture (modified from Johnson and Budd, 1994)
REFERENCES:
Duren, J.D., 1960, Some petrophysical aspects of the Mississippian “Chat” Glick Field, Kiowa County, Kansas : The Shale Shaker, September, p. 316 –321.
Watney, W.L., Guy, W.J., and Byrnes, A.J., 2001, Characterization of the Mississippian chat in south-central Kansas: AAPG Bulletin, v. 85, no. 1, p. 85 – 113.
Ebanks, W.J., Jr., Euwer, R.M., and Nodine-Zeller, D.E., 1977, Mississippian Combination Trap, Bindley Field, Hodgeman County, Kansas : AAPG Bulletin, v. 61, no. 3, p. 309 – 330.
Johnson, R.A., 2009, Distribution and Architecture of Subunconformity Carbonate Reservoirs: Lower Meramecian (Mississippian) Subcrop Trend, Western Kansas: Unconformity Controls 1994 Symposium : Rocky Mountain Association of Geologists, p. 231 – 244.
Johnson, R.A., and Budd, D.A., 1994, The Utility of Continual Reservoir Description: An Example from Bindley Field, Western Kansas: AAPG Bulletin, v. 78, no. 5, p. 722 – 743.