**Exhibit 99.4**

 

**POGO PRODUCING COMPANY**

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**Estimated**

**Future Reserves and Income**

**Attributable to Certain**

**Leasehold and Royalty Interests**

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**(SEC Case)**

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**As of**

**December 31, 2006**

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|            |                  | RYDER SCOTT COMPANY |       |       |       |                      | FAX (713)  651-0849 |
|------------|-----------------------|---------------------|------------|------------|------------|---------------------------|---------------------|
|       | PETROLEUM CONSULTANTS |                |       |       |       |
|       | 1100 LOUISIANA        |                |       | SUITE 3800 |       | HOUSTON, TEXAS 77002-5218 |                | TELEPHONE (713)  651-9191 |
| ** ** | ** **            | ** **          | ** ** | ** ** | ** ** | ** **                |                |   |
| ** ** | ** **            | ** **          | ** ** | ** ** | ** ** | ** **                | ** **          |   |   |
|            |                       |                     |            |            |            |                           |                     |  |  |  |  |

 

February 5, 2007

Pogo Producing CompanyPost Office Box 2504Houston, Texas  77252-2504

Gentlemen:

At your request, we have reviewed the estimatesprepared by the engineering staff of Latigo Petroleum Inc. (a wholly owned subsidiary of Pogo ProducingCompany) of net proved hydrocarbon reserves attributable to theinterests of Latigo in certain properties, as of December 31, 2006.  In our opinion on an aggregate basis, theproved reserves information associated with the properties comply with thedefinitions and disclosure guidelines of the Securities and Exchange Commission’sRegulation S-X Part 210.4-10 Sec.(a) as clarified by the Commission’s StaffAccounting Bulletin No. 40 and the Statement of Financial Accounting StandardsNo. 69.

**Estimated Net Reserves Cash Flow**

The net proved reserves attributable to theproperties we reviewed account for 80 percent of Latigo’s total net provedhydrocarbon reserves, on a gas equivalent basis, as prepared by Latigo as ofDecember 31, 2006.  Latigo’s estimate ofnet reserves attributable to Latigo’s interest in the properties that wereviewed and the reserves of properties that we did not review are summarizedas follows:

**SEC CASE**Estimated NetRemaining ReservesAttributable to the Interests of**Latigo Petroleum Inc.**As of December 31, 2006
|                           | ** **   | **Oil, Condensate** | ** **   | ** **   | ** **   | **Gas**         | ** **   |
|---------------------------|--------------|--------------------------|--------------|--------------|--------------|-----------------|--------------|
| ** **                | ** **   | **and NGLs**        | ** **   | **Gas**      | ** **   | **Equivalents** | ** **   |
| **Proved Developed** | ** **   | **(MBbls)**              | ** **   | **(MMCF)**   | ** **   | **(MMCFE)**     | ** **   |
| Producing                 |         |                     |         |         |         |            |         |
| Reviewed                  |         | 10,158.6                 |         | 48,099.6     |         | 109,051.2       |         |
| Not Reviewed              |         | 1,566.0                  |         | 21,453.5     |         | 30,849.5        |         |
| **Total PDP**             |         | 11,724.6                 |         | 69,553.1     |         | 139,900.7       |         |
|                      |         |                     |         |         |         |            |         |
| Non-Producing             |         |                     |         |         |         |            |         |
| Reviewed                  |         | 639.8                    |         | 9,679.2      |         | 13,518.0        |         |
| Not Reviewed              |         | 138.0                    |         | 2,743.7      |         | 3,571.7         |         |
| **Total PDNP**            |         | 777.8                    |         | 12,422.9     |         | 17,089.7        |         |
| *** ***              | *** *** | *** ***             | *** *** | *** *** | *** *** | *** ***    | *** *** |
| **Proved  Undeveloped**   | *** *** | *** ***             | *** *** | *** *** | *** *** | *** ***    | *** *** |
| Reviewed                  |         | 14,790.3                 |         | 50,377.0     |         | 139,118.8       |         |
| Not Reviewed              |         | 1,445.7                  |         | 21,269.9     |         | 29,944.1        |         |
| **Total PUD**             |         | 16,236.0                 |         | 71,646.9     |         | 169,062.9       |         |
|                      |         |                     |         |         |         |            |         |
| **TOTAL  PROVED**         | ** **   | ** **               | ** **   | ** **   | ** **   | ** **      | ** **   |
| Reviewed                  |         | 25,588.7                 |         | 108,155.8    |         | 261,688.0       |         |
| Not Reviewed              |         | 3,149.7                  |         | 45,467.1     |         | 64,365.3        |         |
| **Total**                 |         | 28,738.4                 |         | 153,622.9    |         | 326,053.3       |         |

1bbl liquid = 6 MCF gas equivalents
| 1200, 530 - 8TH AVENUE, S.W. |   | CALGARY, ALBERTA T2P 3S8    |   | TEL (403) 262-2799 |   | FAX (403) 262-2790 |
|------------------------------|--------|-----------------------------|--------|--------------------|--------|--------------------|
| 621 17TH STREET, SUITE 1550  |   | DENVER, COLORADO 80293-1501 |   | TEL (303) 623-9147 |   | FAX (303) 623-4258 |

 

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Liquid hydrocarbons are expressed in thousands ofstandard 42 gallon barrels (MBBL).  Gasvolumes are sales gas expressed in millions of cubic feet (MMCF) at theofficial temperature and pressure bases of the areas in which the gas reservesare located.

Theestimated quantities of reserves in this report are related to hydrocarbonprices.  Latigo has assured us thatDecember 31, 2006 hydrocarbon prices were used in the preparation of theirprojections as required by SEC guidelines; however, actual future prices mayvary significantly from December 31, 2006 prices.  Therefore, quantities of reserves actuallyrecovered may differ significantly from the estimated quantities presented inthis report.

**ReviewProcedure and Opinion**

Inour opinion, Latigo’s estimates of future reserves for the wells and locationsreviewed by Ryder Scott were prepared in accordance with generally acceptedprocedures for the estimation of future reserves.  In aggregate, Ryder Scott’s estimates were inreasonable agreement on a net equivalent barrel basis (at 6 MCF per barrel)with the estimates prepared by Latigo’s staff.

Certaintechnical personnel of Latigo are responsible for the preparation of reserveestimates on new properties and for the preparation of revised estimates, whennecessary, on old properties.  Thesepersonnel assembled the necessary data and maintained the data and work papersin an orderly manner.  Ryder Scottconsulted with these technical personnel and had access to their work papersand supporting data in the course of our review.

Inperforming our review, we relied upon data furnished by Latigo with respect toproperty interests owned, production and well tests from examined wells,geological maps, well logs, core analyses, and pressure measurements.  Latigo has assured us that, to the best oftheir knowledge they have supplied us with all material data for the properties.  These data were accepted as authentic andsufficient for determining the reserves unless, during the course of ourexamination, a matter of question came to our attention in which case the datawere not accepted until all questions were satisfactorily resolved.  Our review included such tests and proceduresas we considered necessary under the circumstances to render the conclusionsset forth herein.

**ReserveEstimates**

In general, the reserves for the wells and locationsreviewed by Ryder Scott were estimated by performance methods or the volumetricmethod; however, other methods were used in certain cases where characteristicsof the data indicated such methods were more appropriate.

The estimates of reserves by the performance methodutilized extrapolations of various historical data in those cases where suchdata were definitive.  Reserves wereestimated by the volumetric method in those cases where there was inadequatehistorical data to establish a definitive trend or where the use of productionperformance data as a basis for the reserve estimates was considered to beinappropriate and the volumetric data were adequate for a reasonable estimate.

The reserves presented herein are estimates only andshould not be construed as being exact quantities.  Moreover, estimates of reserves may increaseor decrease as a result of future operations.

The definitions of proved reserves are included asan attachment to this report.

**General**

In general, the estimates of reserves for the wellsand locations reviewed by Ryder Scott are based on data available throughDecember 2006.

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Gasimbalances, if any, were not taken into account in the gas reserve estimatesreviewed by Ryder Scott.

Neitherwe nor any of our employees have any interest in the subject properties or ownany Latigo stock and neither the employment to do this work nor thecompensation is contingent on our estimates of reserves for the propertieswhich were reviewed.

Thisreport was prepared for the exclusive use of Latigo Petroleum Inc. and may not be put to other use without our prior written consent forsuch use.  The data and workpapers used in the preparation of this report are available for examination byauthorized parties in our offices. Please contact us if we can be of further service.
|                                |       | Very truly yours,             |
|--------------------------------|------------|-------------------------------|
|                           |       |                          |
| ** **                     | ** ** | **RYDER SCOTT COMPANY, L.P.** |
| ** **                     | ** ** | ** **                    |
| ** **                     | ** ** | ** **                    |
| ** **                     | ** ** | /s/****Brad A.  Gouge         |
|                           |       | Brad A. Gouge, P.E.           |
|                           |       | Petroleum Engineer            |
| BAG/pl                         |       |                          |
|                           |       |                          |
|                           |       |                          |
| Reviewed by:                   |       |                          |
|                           |       |                          |
| /s/ Fred W. Zieche             |       |                          |
| Fred W. Ziehe, P.E.            |       |                          |
| Managing Senior Vice President |       |                          |

 

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