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Ohio Utica Shale

Antero Resources reports 47 percent hike in proved reserves

By Bob Downing Published: July 29, 2013

From Colorado-based Antero Resources today:


Antero Reports 47% Increase in Proved Reserves to 6.3 Tcfe

Denver, CO, July 29, 2013


Antero Resources announced today that its proved reserves at June 30, 2013 were 6.3 Tcfe, a 47% increase compared to its proved reserves at December 31, 2012, in each case assuming ethane rejection as described below. Antero’s June 30, 2013 proved reserves exclude 178 MMBbls of ethane, which are not recovered in the SEC price case through processing under current pricing assumptions for ethane and methane.

Proved, probable and possible reserves (3P) taken in the aggregate totaled 27.7 Tcfe at June 30, 2013, a 28% increase compared to 3P reserves in the aggregate at December 31, 2012, in each case assuming ethane rejection. Aggregate 3P reserves at June 30, 2013 exclude 984 MMBbls of ethane due to pricing assumptions. Our 3P reserves at June 30, 2013 were comprised of 18.7 Tcfe in the Marcellus Shale, 5.3 Tcfe in the Utica Shale and 3.8 Tcfe in the Upper Devonian Shale.

Antero’s proved, probable and possible reserves at June 30, 2013 were audited by DeGolyer and MacNaughton (D&M). D&M’s reserve audit covered properties representing virtually all of Antero’s total estimated Marcellus and Utica Shale proved, probable and possible reserves at June 30, 2013 and was within 3% of Antero’s internal reserve estimates.

Proved Reserves

The following discussion provides a summary of Antero’s estimated reserves as of June 30, 2013, assuming both ethane "rejection" and, alternatively, ethane "recovery." Ethane rejection occurs when ethane is left in the wellhead natural gas stream when the natural gas is processed, rather than being separated out and sold as a liquid after fractionation. When ethane is left in the gas stream, the Btu content of the residue natural gas at the outlet of the processing plant is higher. Producers will generally elect to "reject" ethane at the processing plant when the price received for the ethane in the natural gas stream is greater than the price received for the ethane being sold as a liquid after fractionation, net of fractionation costs. When ethane is recovered in the processing plant, the Btu content of the residue natural gas is lower, but a producer is then able to recover the value of the ethane sold as a separate natural gas liquid (NGL) product. In addition, natural gas processing plants can produce the other NGL products (propane, normal butane, isobutene and natural gasoline) while rejecting ethane.

Antero’s June 30, 2013 reserves assume ethane rejection, as hydrocarbon pricing required by the Securities and Exchange Commission (SEC) economically favored leaving the ethane in the natural gas stream whereas year-end 2012 SEC pricing economically favored ethane recovery. Antero has included June 30, 2013 reserves assuming ethane recovery in order to present a "pricing sensitivity" case comparable to its December 31, 2012 reserves. Unless otherwise noted, mid-year 2013 reserves assume ethane rejection.

The Marcellus Shale accounted for 95% of Antero’s proved reserve volumes at June 30, 2013, and the Utica Shale accounted for the remaining 5%. Also at mid-year 2013, 91% of Antero’s proved reserves by volume were natural gas, 8% were NGLs and 1% was crude oil. As of June 30, 2013, 27% of Antero’s 320,000 net acres of leasehold in the Marcellus were classified as proved. Given Antero’s successful



drilling results to date as well as those of other operators in the vicinity of Antero’s leasehold, Antero believes that a substantial portion of its Marcellus Shale acreage will be added to proved reserves over time as more wells are drilled.

Proved developed reserves increased by 55% from year-end 2012 to 1.4 Tcfe as of June 30, 2013 as a result of Antero’s successful execution of its development drilling plan. Aggregate proved undeveloped reserves increased by 44%, primarily due to a 41% increase in Marcellus proved undeveloped reserves and a 137% increase in Utica proved undeveloped reserves. Proved undeveloped reserves accounted for 77% of total proved reserves at June 30, 2012 as compared to 78% at December 31, 2012.

Under SEC rules, proved undeveloped reserves are limited to reserves that are planned to be developed in the five years after initial booking. Antero’s 4.8 Tcfe of proved undeveloped reserves will require an estimated $4.7 billion of development capital over the next five years, resulting in an average development cost for such proved undeveloped reserves of $0.96 per Mcfe. The estimated average development cost for Marcellus proved undeveloped reserves is $0.96 per Mcfe and for Utica proved undeveloped reserves is $0.90 per Mcfe. Antero plans to utilize a combination of operating cash flow, credit facility capacity and potential capital markets transactions to fund this development.

Pre-Tax PV10 of Proved Reserves

SEC rules require that reserve calculations be based on the average first day of the month prices for the previous 12 months (SEC prices). SEC prices for June 30, 2013 reserves averaged $3.44 per MMBtu, while benchmark natural gas prices at the basin were $3.43 per MMBtu in the Appalachian Basin, a 23% increase from the $2.78 per MMBtu benchmark basin price used at December 31, 2012. Using SEC prices adjusted for energy content and quality, the pre-tax present value discounted at 10% ("pre-tax PV10"), a non-GAAP measure, of the June 30, 2013 proved reserves was $4.5 billion excluding Antero’s natural gas and oil hedges. Including Antero’s hedges as of June 30, 2013 using SEC prices and discounted at 10%, the pre-tax PV10 value of proved reserves and hedges was $5.4 billion, a 67% increase from year-end 2012. The pre-tax PV10 value of proved developed reserves increased by 102% from year-end 2012 to $2.1 billion, excluding hedges. The pre-tax PV10 value of proved developed reserves increased by 29% to $3.0 billion including the PV10 value of commodity hedges. GAAP does not prescribe any corresponding measure for pre-tax PV10 calculated other than at year end. As a result, it is not practicablfor Antero to reconcile the pre-tax PV10 values included herein to GAAP standardized measure.


For the six months ended June 30, 2013 Antero added 2 Tcfe of proved reserves through the drill bit, gained 10 Bcfe through positive price revisions and gained 82 Bcfe through positive performance revisions.


Summary of Changes in Proved Reserves

(in Bcfe and assuming ethane rejection)



Balance at December 31, 2012






Extensions, discoveries and other additions











Performance revisions






Price revisions

















Balance at June 30, 2013








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