The Company is making the following supplemental disclosures of oil and gas producing activities, in accordance with ASC 932, Extractive Activities – Oil and Gas, as amended by ASU 2010-03, Oil and Gas Reserve Estimation and Disclosures, and SEC Regulation S-X. The Company uses the successful efforts accounting method for its oil and gas exploration and development activities.

Capitalized Costs

The aggregate amounts of costs capitalized for oil and gas exploration and development activities and the related amounts of accumulated depreciation, depletion and amortization are shown below and includes capitalized costs classified as “Noncurrent assets held for sale” on the Consolidated Balance Sheets:



	December 31,
	2018			2017
	(in millions)
Proved properties	$	12,140.7		$	12,470.9
Unproved properties, net	759.1			1,095.8
Total proved and unproved properties	12,899.8			13,566.7
Accumulated depreciation, depletion and amortization	(7,450.5		)	(6,642.9		)
Net capitalized costs	$	5,449.3		$	6,923.8

Costs Incurred

The costs incurred in oil and gas acquisition, exploration and development activities are displayed in the table below. Costs associated with the Company's midstream and corporate activities are not included. Development costs are net of the change in accrued capital costs of $59.2 million and ARO additions and revisions of $0.8 million during the year ended December 31, 2018. The costs incurred for the development of reserves that were classified as proved undeveloped were approximately $606.5 million in 2018, $389.3 million in 2017 and $258.1 million in 2016.



	Year Ended December 31,
	2018		2017		2016
	(in millions)
Proved property acquisitions	$	39.1	$	269.6	$	431.6
Unproved property acquisitions	25.8		532.4		208.7
Other acquisitions	0.8		13.2		—
Exploration costs (capitalized and expensed)	0.3		32.7		13.4
Development costs	1,133.1		1,189.3		509.2
Total costs incurred	$	1,199.1	$	2,037.2	$	1,162.9

Results of Operations

Following are the results of operations of QEP's oil and gas producing activities, before allocated corporate overhead and interest expenses. Revenues and expenses relating to the Company's midstream and corporate activities are not included.



	Year Ended December 31,
	2018			2017			2016
	(in millions)
Revenues	$	1,920.3		$	1,548.1		$	1,271.0
Production costs	507.3			675.4			616.7
Exploration expenses	0.3			22.0			1.7
Depreciation, depletion and amortization	836.4			735.1			852.3
Impairment	1,560.9			72.3			1,194.3
Total expenses	2,904.9			1,504.8			2,665.0
Income (loss) before income taxes	(984.6		)	43.3			(1,394.0		)
Income tax benefit (expense)	243.2			(16.0		)	517.2
Results of operations from producing activities excluding allocated corporate overhead and interest expenses	$	(741.4	)	$	27.3		$	(876.8	)

Estimated Quantities of Proved Oil and Gas Reserves

Estimates of proved oil and gas reserves have been completed in accordance with professional engineering standards and the Company's established internal controls, which include the oversight of a multi-functional Reserves Review Committee reporting to the Company's Audit Committee of the Board of Directors. The Company retained Ryder Scott Company, L.P. (RSC), independent oil and gas reserve evaluation engineering consultants, to prepare the estimates of all of its proved reserves as of December 31, 2018, 2017 and 2016. The estimated proved reserves have been prepared in accordance with the SEC's Regulation S-X and ASC 932 as amended. The individuals performing reserves estimates possess professional qualifications and demonstrate competency in reserves estimation and evaluation. The estimates of proved reserves are inherently imprecise and are continually subject to revision based on production history, results of additional exploration and development, price changes and other factors.

All of QEP's proved undeveloped reserves at December 31, 2018, are scheduled to be developed within five years from the date such locations were initially disclosed as proved undeveloped reserves. The Company plans to continue development of its leaseholds and anticipates that it will have the financial capability to continue development in the manner estimated. While the majority of QEP's PUD reserves are located on leaseholds that are held by production, any PUD locations on expiring leaseholds are scheduled for development during the primary term of the lease.

As of December 31, 2018, all of the Company's oil and gas reserves are attributable to properties within the United Sates. A summary of the Company's changes in quantities of proved oil and condensate, gas and NGL reserves for the years ended December 31, 2016, 2017 and 2018 are as follows:



	Oil and condensate		Gas		NGL		Total⁽¹³⁾
	(MMbbl)		(Bcf)		(MMbbl)		(MMboe)
Balance at December 31, 2015	193.1		2,108.9		58.8		603.4
Revisions of previous estimates⁽¹⁾	(9.7	)	412.8		(0.3	)	58.8
Extensions and discoveries⁽²⁾	13.0		158.1		3.3		42.6
Purchase of reserves in place⁽³⁾	62.7		54.6		11.5		83.3
Sale of reserves in place⁽⁴⁾	(0.2	)	(3.6	)	(0.1	)	(0.9	)
Production	(20.3	)	(177.0	)	(6.0	)	(55.8	)
Balance at December 31, 2016	238.6		2,553.8		67.2		731.4
Revisions of previous estimates⁽⁵⁾	3.7		12.5		(3.1	)	2.7
Extensions and discoveries⁽⁶⁾	59.1		101.9		10.4		86.4
Purchase of reserves in place⁽⁷⁾	46.6		125.5		8.7		76.3
Sale of reserves in place⁽⁸⁾	(7.9	)	(831.2	)	(12.6	)	(159.0	)
Production	(19.6	)	(168.9	)	(5.4	)	(53.1	)
Balance at December 31, 2017	320.5		1,793.6		65.2		684.7
Revisions of previous estimates⁽⁹⁾	2.1		314.0		6.7		61.0
Extensions and discoveries⁽¹⁰⁾	57.1		56.5		9.8		76.3
Purchase of reserves in place⁽¹¹⁾	8.2		7.9		1.3		10.9
Sale of reserves in place⁽¹²⁾	(24.9	)	(544.8	)	(7.1	)	(122.8	)
Production	(23.9	)	(139.6	)	(4.7	)	(51.9	)
Balance at December 31, 2018	339.1		1,487.6		71.2		658.2
Proved developed reserves
Balance at December 31, 2015	109.7		1,245.3		34.4		351.6
Balance at December 31, 2016	103.2		1,309.8		35.7		357.2
Balance at December 31, 2017	116.0		655.5		27.9		253.1
Balance at December 31, 2018	133.6		382.3		31.5		228.9
Proved undeveloped reserves
Balance at December 31, 2015	83.4		863.6		24.4		251.8
Balance at December 31, 2016	135.4		1,244.0		31.5		374.2
Balance at December 31, 2017	204.5		1,138.1		37.3		431.6
Balance at December 31, 2018	205.5		1,105.3		39.7		429.3

___________________________

⁽¹⁾

Revisions of previous estimates in 2016 include 77.3 MMboe of positive revisions, primarily related to successful workovers in Haynesville/Cotton Valley; reserves associated with increased density wells in areas that have been previously developed on lower density spacing; and 5.5 MMboe of positive performance revisions. These positive revisions were partially offset by 18.5 MMboe of negative revisions related to pricing, driven by lower oil, gas and NGL prices.


⁽²⁾	Extensions and discoveries in 2016 were primarily in the Permian and Uinta basins and related to new well completions and associated new PUD locations.


⁽³⁾	Purchase of reserves in place in 2016 primarily relates to QEP's 2016 Permian Basin Acquisition as discussed in Note 3 – Acquisitions and Divestitures.


⁽⁴⁾	Sale of reserves in place in 2016 relates to the divestiture of QEP's interest in certain non-core properties as discussed in Note 3 – Acquisitions and Divestitures.

⁽⁵⁾

Revisions of previous estimates in 2017 include 2.7 MMboe of positive revisions, primarily related to 32.0 MMboe of positive revisions related to pricing, driven by higher oil, gas and NGL prices and 2.2 MMboe of positive performance revisions. These positive revisions were partially offset by 11.0 MMboe of negative revisions related to higher operating costs and 20.5 MMboe of other revisions primarily from changing to a horizontal development plan from a vertical well development plan in the Uinta Basin and increased longer laterals in Haynesville/Cotton Valley. These negative other revisions are partially offset by positive other revisions from successful infill drilling in Haynesville/Cotton Valley and the Williston Basin.


⁽⁶⁾	Extensions and discoveries in 2017 primarily related to new well completions and associated new PUD locations in the Permian Basin.


⁽⁷⁾	Purchase of reserves in place in 2017 was primarily related to QEP's 2017 Permian Basin Acquisition and various other acquired oil and gas properties as discussed in Note 3 – Acquisitions and Divestitures.


⁽⁸⁾	Sale of reserves in place in 2018 was primarily related to QEP's Pinedale Divestiture as discussed in Note 3 – Acquisitions and Divestitures.

⁽⁹⁾

Revisions of previous estimates in 2018 totaling 61.0 MMboe of positive revisions include 23.4 MMboe of other revisions, primarily related to changing our development plans in the Haynesville/Cotton Valley; 17.3 MMboe of positive revisions related to pricing, primarily driven by higher oil prices; 11.7 MMboe of positive revisions related to lower operating costs; and 8.7 MMboe of positive performance revisions.


⁽¹⁰⁾	Extensions and discoveries in 2018 primarily related to new well completions and associated new PUD locations in the Permian Basin.


⁽¹¹⁾	Purchase of reserves in place in 2018 primarily relates to the additional acquisitions in the Permian Basin as discussed in Note 3 – Acquisitions and Divestitures.


⁽¹²⁾	Sale of reserves in place in 2018 was primarily related to QEP's Uinta Basin Divestiture as discussed in Note 3 – Acquisitions and Divestitures.


⁽¹³⁾	Generally, gas consumed in operations was excluded from reserves, however, in some cases, produced gas consumed in operations was included in reserves when the volumes replaced fuel purchases.

Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Reserves

Future net cash flows were calculated at December 31, 2018, 2017 and 2016, by applying prices, which were the simple average of the first-of-the-month commodity prices, adjusted for location and quality differentials, for each of the 12 months during 2018, 2017 and 2016, with consideration of known contractual price changes. The prices used do not include any impact of QEP's commodity derivatives portfolio. The following table provides the average benchmark prices per unit, before location and quality differential adjustments, used to calculate the related reserve category:



	For the year ended December 31,
	2018		2017		2016
Average benchmark price per unit:
Oil price (per bbl)	$	65.56	$	51.34	$	42.75
Gas price (per MMBtu)	$	3.10	$	2.98	$	2.48

Year ended operating expenses, development costs and appropriate statutory income tax rates, with consideration of future tax rates, were used to compute the future net cash flows. All cash flows were discounted at 10% to reflect the time value of cash flows, without regard to the risk of specific properties. The estimated future costs to develop proved undeveloped reserves are approximately $620.1 million in 2019, $882.0 million in 2020 and $1,025.1 million in 2021. Estimated future development costs include capital spending on major development projects, some of which will take several years to complete. QEP believes cash flow from its operating activities, cash on hand and borrowings under its revolving credit facility will be sufficient to cover these estimated future development costs.

The assumptions used to derive the standardized measure of discounted future net cash flows are those required by accounting standards and do not necessarily reflect the Company's expectations. The information may be useful for certain comparative purposes but should not be solely relied upon in evaluating QEP or its performance. Furthermore, information contained in the following table may not represent realistic assessments of future cash flows, nor should the standardized measure of discounted future net cash flows be viewed as representative of the current value of the Company's reserves. Management believes that the following factors should be considered when reviewing the information below:


•	Future commodity prices received for selling the Company's net production will likely differ from those required to be used in these calculations.


•	Future operating and capital costs will likely differ from those required to be used in these calculations and do not reflect cost savings of Company owned midstream operations on future operating expenses.


•	Future market conditions, government regulations, reservoir conditions and risks inherent in the production of oil and gas may cause production rates in future years to vary significantly from those rates used in the calculations.


•	Future revenues may be subject to different production, severance and property taxation rates.


•	The selection of a 10% discount rate is arbitrary and may not be a reasonable factor in adjusting for future economic conditions or in considering the risk that is part of realizing future net cash flows from the reserves.

The standardized measure of discounted future net cash flows relating to proved reserves is presented in the table below:



	Year Ended December 31,
	2018			2017			2016
	(in millions)
Future cash inflows	$	26,482.6		$	22,028.9		$	16,239.8
Future production costs	(9,539.9		)	(9,074.2		)	(7,789.0		)
Future development costs⁽¹⁾	(4,441.5		)	(4,726.0		)	(3,432.9		)
Future income tax expenses⁽²⁾	(2,553.6		)	(1,439.1		)	(913.4		)
Future net cash flows	9,947.6			6,789.6			4,104.5
10% annual discount for estimated timing of net cash flows	(4,991.9		)	(3,692.3		)	(2,176.5		)
Standardized measure of discounted future net cash flows	$	4,955.7		$	3,097.3		$	1,928.0

___________________________


⁽¹⁾	Future development costs include future abandonment and salvage costs.


⁽²⁾	The standardized measure of discounted future net cash flows for the year ended December 31, 2018 and 2017, were estimated assuming a 21% federal tax rate from the Tax Legislation enacted in December 2017.

The principal sources of change in the standardized measure of discounted future net cash flows relating to proved reserves is presented in the table below:



	Year Ended December 31,
	2018			2017			2016
	(in millions)
Balance at January 1,	$	3,097.3		$	1,928.0		$	2,476.3
Sales of oil and condensate, gas and NGL produced, net of production costs	(1,413.0		)	(872.7		)	(654.3		)
Net change in sales prices and in production (lifting) costs related to future production	1,632.5			1,457.2			(739.4		)
Net change due to extensions and discoveries	692.6			556.8			81.8
Net change due to revisions of quantity estimates	732.0			9.9			122.7
Net change due to purchases of reserves in place	117.0			342.7			256.5
Net change due to sales of reserves in place	(369.6		)	(504.7		)	(4.3		)
Previously estimated development costs incurred during the period	735.6			475.4			374.6
Changes in estimated future development costs	(28.3		)	(283.4		)	(476.5		)
Accretion of discount	375.4			235.7			311.1
Net change in income taxes	(615.7		)	(227.4		)	205.4
Other	(0.1		)	(20.2		)	(25.9		)
Net change	1,858.4			1,169.3			(548.3		)
Balance at December 31,	$	4,955.7		$	3,097.3		$	1,928.0