World Shale Gas Resources: An Initial Assessment of 14 by US Energy Information Administration

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7 p rovides an illustration of the relationship between thermal maturity and the development of nanopores in the shale matrix.  Geographic Location. The prospective area is limited to the onshore portion of the shale gas basin. February 17, 2011 2-7 Assessment of International Shale Gas Figure 2-6. Thermal Maturation Scale Figure 2-7. Thermal Maturity and Gas Storage Capacity Nanopores in Maturing Kerogen Source: Reed et al. PPT February 17, 2011 2-8 Assessment of International Shale Gas The prospective area contains the higher quality portion of the shale gas resource and, in general, covers less than half of the overall basin area.

Within this prospective ar ea, the s hale has a moderate resource concentration of 61 Bcf/mi2. A s such, the shale gas in-place is 83 Tcf risked. B ased on favorable reservoir mineralogy and other properties, we estimate a risked technically recoverable shale gas resource of 29 Tcf for the Cordova Embayment, Table I-1. Activity. Nexen has acquired a 38,000-acre lease position in the Cordova Embayment and has drilled one new exploration well. Penn West Energy Trust and Mitsubishi have formed a joint venture to develop the estimated 5 to 7 Tcf of recoverable shale gas resources on their 120,000-acre (gross) lease area, planning to drill 5 wells in 2010.

Ternary Diagram of Shale Mineralogy (Marcellus Shale). Quartz (Q) Calcite (C) Clay (Cly) Source: Modified from AAPG Bull. 4/2007, p. 4. Relationship of Shale Mineralogy (Q, C and Cly) and Thermal Maturity to Gas Flow Source: Modified from AAPG Bull. 4/2007, p. PPT  Depth. The depth criterion for the prospective area is greater than 1,000 meters, but less t han 5, 000 meters ( 3,300 feet t o 16 ,500 feet). A reas s hallower t han 1, 000 meters have lower pressure and a lower gas concentration. In addition, shallow shale g as formations h ave r isks o f hi gher w ater c ontent i n t heir nat ural fracture systems.

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