BACKGROUND GEOLOGY. Hoaglund 1. Wichita Orogeny to the south (10k 15k uplift) Rapid erosion and deposition of uplifted granitic basement rock ~18,000

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1 POST APPRAISAL OF THE MISSOURIAN HOGSHOOTER HYDROCARBON SYSTEM: IMPLICATIONS FOR FUTURE EXPLOITATION IN THE ANADARKO BASIN STEVE HOAGLUND (GEOLOGIST CHESAPEAKE ENERGY) BACKGROUND GEOLOGY Wichita Orogeny to the south (10k 15k uplift) Rapid erosion and deposition of uplifted granitic basement rock ~18, miles Ron Blakey Oklahoma Geological Survey, 2008 Thick accumulations of Missourian Aged Washes along the paleo-mountain front in Wheeler County, TX and Beckham County, OK 1

2 STRATIGRAPHY NW SE Roberts Co. Hemphill Co. Roger Mills Co. Wheeler Co. Beckham Co. Regionally extensive flooding surfaces can be correlated throughout the basin PRODUCTION HISTORY Hogshooter Wash Horizontal Prospect Vertical production is not always indicative of horizontal potential 2

3 UPPER HOGSHOOTER WASH: PLAY EXTENTS 6% Density Porosity Isopach with Subsea Structure Overlay 5 North UPPER HOGSHOOTER WASH: STRATIGRAPHIC TRAP 5.5 miles South MSSR L Edge? Limit of sand deposition HGSR Edge HGSR MSSR L N S Seismic data courtesy of CGG 6 3

4 EXPLORATION STRATEGY Forest Frye Ranch 6-29H Non-Op Well proposal (2011) Located in a mapped thick Steered 100% in zone Cum 64 MBO in first month of production EUR 1.4 BCF MBO Upper Hogshooter 6% Porosity Isopach Original Prospect Map May, st 15 days production Steering Plot Forest Oil Frye Ranch 6-29H 4

5 EARLY SUCCESS: THURMAN HORN 406H Pilot Hole Logs 1 st 10 days of production 45 API CUM: 546 MBO, 2.4 BCF EUR: 603 MBO; 4.3 BCF COI Thurman Horn 406H COI Meek 41 9H Forest Frye Ranch 6-29H Petrophysical Properties Effective Effective In-situ Oil Thickness SW OOIP Well Porosity Permeability Effective (Interval) ft Effective % % In-situ md Oil MBOE/SEC Thickness SW OOIP Thurman Well Horn 407H 94 Porosity Permeability (Upper (Interval) Hogshooter) ft % % md MBOE/SEC Thurman Horn 406H 407H (Upper Hogshooter) HOGSHOOTER FRAC MODEL Frac modeling suggests two discrete reservoirs when both Upper and Lower Hogshooter are present 2 5

6 PETROPHYSICAL MAPPING Porosity Feet Flow Unit Thickness Bulk Volume Hydrocarbon Permeability Feet Mapping of petrophysical parameters results in similar trends MEEK 41 10H: SANDS Subrounded igneous pebbles Tc S/R Sands show depositional characteristics of a deepwater channel/lobe complex Softsediment deformation Dish Structures Scour surface? Scour surface Ta/Tb? Subrounded igneous pebbles Lower Missourian Wavy lamination Cross bedding Flute Cast Upper Hogshooter HS Lower Hogshooter Scour surfaces? C1 Rip-up clasts Base Hogshooter LS Ta Debrites A. Seyedolali and S. (2012) Chesapeake Energy (Galloway & Hobday, 1996) 4 6

7 MEEK 41 10H: SOURCE ROCK Organic-rich shales bracketing the reservoir have excellent source-rock potential Facies Key Proximal-well mixed low clastic load-terrestrial organic matter high + high bacterial reworking Proximal-well mixed high clastic load-terrestrial organic matter high 7% TOC 0.95% R o -HI 15.4 S2 (mg/g) Open Marine-poorly mixed low clastic load-algal organic matter 3.5% TOC 1.0% R o -HI 7.5 S2 (mg/g) Seyedolali and S. (2012) Chesapeake Energy TOC Total Gamma Ray HI Th/U 6.7% TOC 0.98% R o -HI 17.3 S2 (mg/g) GEOCHEMICAL STUDY: TYPING THE OILS δ 13 C (per mille) Main Source Beds δ 13 C (per mille) V. Nowaczewski and others (2014) Chesapeake Energy Hogshooter Bitumen and oil is isotopically distinct from that of the Woodford shale oil. The fact that the Hogshooter oils are on the light side of the Hogshooter shale bitumen range further suggests that the open marine organic facies is largest contributor to the Hogshooter reservoir oil pool. Biomarker and bulk isotope analyses indicate that Hogshooter oils are sourced by Hogshooter Shales 7

8 GEOCHEMICAL STUDY Geochemical Analysis Complete Whole Core V. Nowaczewski and others (2014) Chesapeake Energy Hogshooter oils/condensates are genetically related to the inter-bedded shales within the system 8

9 EARLY SUCCESS: THURMAN HORN 406H Pilot Hole Logs 1 st 10 days of production 45 API CUM: 546 MBO, 2.4 BCF EUR: 603 MBO; 4.3 BCF COI Thurman Horn 406H COI Meek 41 9H Forest Frye Ranch 6-29H Petrophysical Properties Effective Effective In-situ Oil Thickness SW OOIP Well Porosity Permeability Effective (Interval) ft Effective % % In-situ md Oil MBOE/SEC Thickness SW OOIP Thurman Well Horn 407H 94 Porosity Permeability (Upper (Interval) Hogshooter) ft % % md MBOE/SEC Thurman Horn 406H 407H (Upper Hogshooter) HOGSHOOTER FRAC MODEL Frac modeling suggests two discrete reservoirs when both Upper and Lower Hogshooter are present 2 9

10 PETROPHYSICAL MAPPING Porosity Feet Flow Unit Thickness Bulk Volume Hydrocarbon Permeability Feet Mapping of petrophysical parameters results in similar trends MEEK 41 10H: SANDS Subrounded igneous pebbles Tc S/R Sands show depositional characteristics of a deepwater channel/lobe complex Softsediment deformation Dish Structures Scour surface? Scour surface Ta/Tb? Subrounded igneous pebbles Lower Missourian Wavy lamination Cross bedding Flute Cast Upper Hogshooter HS Lower Hogshooter Scour surfaces? C1 Rip-up clasts Base Hogshooter LS Ta Debrites A. Seyedolali and S. (2012) Chesapeake Energy (Galloway & Hobday, 1996) 4 10

11 MEEK 41 10H: SOURCE ROCK Organic-rich shales bracketing the reservoir have excellent source-rock potential Facies Key Proximal-well mixed low clastic load-terrestrial organic matter high + high bacterial reworking Proximal-well mixed high clastic load-terrestrial organic matter high 7% TOC 0.95% R o -HI 15.4 S2 (mg/g) Open Marine-poorly mixed low clastic load-algal organic matter 3.5% TOC 1.0% R o -HI 7.5 S2 (mg/g) Seyedolali and S. (2012) Chesapeake Energy TOC Total Gamma Ray HI Th/U 6.7% TOC 0.98% R o -HI 17.3 S2 (mg/g) GEOCHEMICAL STUDY: TYPING THE OILS δ 13 C (per mille) Main Source Beds δ 13 C (per mille) V. Nowaczewski and others (2014) Chesapeake Energy Hogshooter Bitumen and oil is isotopically distinct from that of the Woodford shale oil. The fact that the Hogshooter oils are on the light side of the Hogshooter shale bitumen range further suggests that the open marine organic facies is largest contributor to the Hogshooter reservoir oil pool. Biomarker and bulk isotope analyses indicate that Hogshooter oils are sourced by Hogshooter Shales 11

12 GEOCHEMICAL STUDY Geochemical Analysis Complete Whole Core V. Nowaczewski and others (2014) Chesapeake Energy Hogshooter oils/condensates are genetically related to the inter-bedded shales within the system 12