Codell SS A Review of the Northern DJ Oil Resource Play Laramie County, WY & Weld County, CO Robert Sterling Richard Bottjer Kevin Smith Cirque Resources LP AAPG ACE, Denver June 2, 2015
Cretaceous Petroleum System 3.65 Billion BO Cum to Date Powder River Basin DJ Basin Activity 2010 Noble Gemini K01-99HZ 500 BOD first 60 days avg Started horizontal program in Wattenberg EOG Jake 2-01H 1500 BOD IP 645 BOD first…
Denver Julesburg Basin Horizontal Drilling Evolution and Permits 2009 2015Wells Drilled In five years, horizontal drilling reenergized Silo Brennsee the DJ Basin and led to new Codell discoveries In the last 5 years DJ oil…
Codell Producing Wells before 2010 Wells with shows in Codell Wells with Production from Codell 5,062 BO Very few vertical completion attempts 1,018 BO north of Wattenberg Field DST In Codell Silo Vertical Wells in oil window…
DST Noted on mudlog critical for understanding Basin Centered Oil (BCO) Potential of area Slight overpressuring seen on DST suggested a BCO accumulation DST Data never made it into Wyoming State Database making mudlog a critical piece…
Codell Cores Taken in 2010 Wells with core in CODELL SS 3 verticals wells drilled by Noble & Cirque with cores taken in Niobrara & Codell 1 vertical well drilled by SM Energy with core in Niobrara & Codell Cirque conducted a…
Core Critical in Reservoir Characterization Cirque/Noble Energy Cirque/Noble Energy Cirque/Noble Energy Berry UN 13-9 Child VO 30-9 Lazy D ZN 03-09 Cirque had three Niobrara/Codell cores taken in 2010. All cores show significant…
Development History of Codell SS Laramie County, WY Initial drilling for Codell Laterals 2012 Drilling as of 12/31/2012 First four wells drilled as 640 ac DSU SM Tomahawk 1-30 SW-NE lateral KF Roadrunner 1-6H Kaiser Francis…
Development History of Codell SS Laramie County, WY Several operators permitting large number of wells Drilling and permitting as of 4/25/15 EOG is most active operator in the play Kaiser Francis has drilled many Codell wells in the…
Regional Structure Map DJ Basin Regional Structure on Top of Niobrara FM Asymmetrical basin with thrust contact on the western margin against the Laramide orogeny (Rocky Mountains) Top of Niobrara ranges from 7,200 TVD to…
DJ Basin Pay Zone Stratigraphy Stratigraphic Column Niobrara The DJ Basin produced over 2.2 Bboe from Cretaceous reservoirs, primarily from Historically productive at Wattenberg, Silo & several smaller fields Codell and Niobrara,…
Paleogeographic Setting Western Interior Cretaceous Seaway (85 Ma) Western Interior Cretaceous Seaway (WIC) is asymmetric foreland Cretaceous seaway from Arctic to Gulf of Mexico Following regional Codell Sandstone deposition in low…
Codell Paleogeography Paleogeography of the Late Middle Turonian, Zone Prionocyclus Hyatti Deposition occurred along the eastern margin of the Cretaceous Epeiric Seaway Represented by sandstones deposited in a shallow marine…
Regional Codell Sandstone Gross Thickness N. Wattenberg to Brennsee Codell Sandstone Thickens to the North Codell Sandstone is ubiquitous over a large regional area from Wattenberg Field in Weld County to Laramie County in Wyoming…
N Goshen Co N Goshen Co Codell SS pinches out in southern Goshen CO, WY Wall Ck Member of the Frontier FM develops in S S Goshen CO and north Mistaken for Codell SS in Wall Ck Goshen CO Isopach N S Ft. Hays LS Codell SS…
Regional Thermal Maturity Niobrara Tmax Contours and Burial Histories Type Log Tmax Contours for the Niobrara Brennsee/Fairway area lies within a favorable Thermal Maturity fairway for the cretaceous petroleum sustem TMax values in…
Regional Thermal Maturity Vitrinite Reflectance (Ro) for J Sand Interval Overview Samples were analyzed using vitrinite reflectance in the J Sand for a view of the thermal maturity of the rocks deeper than the Niobrara
Regional Unconformity in the Codell Maximum Preservation of Codell is in Project Area B Brennsee/Fairway Area Wattenberg Field Codell 20 to 30 thick Codell 10 to 20 thick B 18
Codell Isopach in Laramie County, WY Silo Field Gross Isopach shows Codell thickness ranges from 20 30 and is ubiquitous over the Brennsee/Fairway Area Fairway Field Gross sandstone thickness is comprised of: Upper…
Codell Subsea Structure Map Faulting in Silo is not as extensive as previously thought based on modern 3D seismic data. Faulting away from Silo and the Borderline Fault is minimal Codell TVD ranges from 7,800 to 9,400 20
Codell Core Analysis Distinct Lithologies Within the Codell Cirque/Noble Child VO 30-09 UV Photos of Slabbed Core Laminated Facies Best reservoir characteristics Always saturated with oil Usually in middle of the Codell section…
Codell Lithology / X-Ray Diffraction Selected Observations Codell sandstone is dominated by quartz with other major minerals being clays and feldspars Sales Area Minor minerals include Calcite, Apatite, Glauconite, and Pyrite…
Codell Thin Section Analysis Thin Sections show porosity in both plain and epiflourescent light Under epiflourescent light 50x intergranular microporosity is apparent in Feldspars Very difficult to differentiate facies in thin…
Codell Porosity and Permeability Selected Observations Core Porosity vs Core Sw Codell Sw decreases as porosity increases Core data in Sales Area range from 12-14% Phi and 30-50% Sw Laminated zone has slightly better reservoir…
Fluid Analysis Oil gravity = 38 API GOR = 900 scf/bbl average Water cut ranges from a low of 20% to a high of 45% Reservoir pressure has not been directly measured by bottom hole pressure but DFIT & DST indicates a range of .51 to…
It is important to be In Zone 640 acre spacing lateral effective lateral lengths need to exceed 3,500 to yield favorable results Effective Lateral length refers to the amount of lateral actually residing within the Codell…
Lateral Length Matters in the Codell All new wells are drilled on 1280 ac DSUs 1280 ac DSU 22 EOG Fairway Field Codell Laterals Includes Newly released wells 640 ac DSU 960 ac DSU Warren Tomahawk Chastanet Codell…
Oil Sourcing, Generation & Migration
Codell Oil is from the Niobrara FM.
Distribution of Oil Maturities from Niobrara Sourced Oils Oil found in Codell SS is generally higher maturity than oil found in Niobrara, though all sourced from Niobrara Nio C Silo Codell
CODELL SANDSTONE Injection Pressure vs Mercury Saturation MERCURY INJECTION CAPILLARY PRESSURE Mercury Injection Cirque Resources Composite of All Samples Capilliary Pressure as a 100,000 proxy for oil saturation Plot (1-Sw) from…
CODELL SANDSTONE Injection Pressure vs Mercury Saturation MERCURY INJECTION CAPILLARY PRESSURE Plotting 1-Sw regionally Composite of All Samples Cirque Resources Composite of All Samples 1-6A Moonstone LamFluo suggests an oil…
Thermal Maturity Vitrinite Reflectance in the J Sand More variability in the J Sand Ro Highest thermal maturity in the area near the state line Injection Pressures from MICP data are listed next to the wells cores were taken from
Distribution of C Marl is critical to Oil Generaton and migration into the Codell SS B Bench Chalk B Marl C Bench Chalk C Marl Ft. Hays LS Sage Breaks SH Codell SS Carlisle SH
Niobrara C Chalk Distribution relative to J Sand Ro Thermal Maturity Well with highest oil saturations and highest MICP injection pressures is located where the C Chalk is not present C Marl is organic rich Catagenesis without an…
Generation and Explulsion Model Oil Generation in the Oil generated in C Chalk finds C Marl porosity to occupy in the Chalk, Oil is expelled through fractured Ft. thus less is expulsed into Codell Hays into Codell SS SS. B Marl…
Summary A new Sweet Spot has been found in Laramie County, Wyoming Codell SS is primary driver of the play C Bench is being actively developed AB Bench wells are planned Careful correlation of core data and well logs led to the…
Acknowledgements Cirque Resources LP Weatherford Labs & Mudlogging Noble Energy GeoMark Triple O Slabbing
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