particularly referred to, showing the reserve petroleum in the tideland area of California, and that was an oversight. I would like to have that in the record.

Senator MOORE. Yes, that will be put in.

ONE HUNDRED PERCENT ESTIMATE OF PROVED FUTURE PRODUCTION, TIDELAND OIL FIELDS, STATE OF CALIFORNIA, AS OF JULY 1, 1947

This report estimates that the proved future production of the tideland oil fields, State of California, as of July 1, 1947, to be 167,551,000 barrels. The total past production of all tideland wells, to June 30, 1947, amounts to 151,074,488 barrels, indicating an ultimate production of 318,625,488 barrels.

This report estimates, therefore, that 52.6 percent of the proved ultimate pro duction remains to be produced. The writer further estimates that the production of the present known reserves will extend over a period of the next 40 years. A summary schedule of the past production, 100 percent estimated future production, and ultimate production, by fields, is as follows:

Each pro

The following paragraphs will describe the methods used in determining the estimates of future production as indicated in the above schedule. ducing field will be discussed separately.

CAPITAN OIL FIELD

The total past production of oil from the tideland portion of the Capitan oil field; Santa Barbara County, Calif., to June 30, 1947, amounts to 45,334 barrels. At the present time only one well is producing from the tidelands. This well is operated by Mr. B. D. Owens under State oil and gas lease No. 169. During the first 6 months of 1947 the 100-percent production from State oil and gas lease No. 169 amounted to 1,047 barrels, or less than 6 barrels per day.

It is herein estimated that the 100-percent future production, as of July 1, 1947, from the one producing well will be 9,000 barrels. This estimate is based on a projection of a yearly curve of the past production. The future life of the well is estimated to be noncommercial after 5 years, or to a producing rate of about 3 barrels per day.

ELWOOD OIL FIELD

For the purpose of this report, the discussion of the Elwood oil field will be divided into two parts, namely, the old area (easterly portion of the field) and the new area (area lying west of State oil and gas lease No. 98).

A summary schedule of the cumulative past production and the 100-percent estimated future production for the two areas is as follows:

The "old area," as used in this report, is comprised of State oil and gas leases No. 88, 89, 90, 91, 92, 93, and 98.

The estimate of future production from the leases within the "old area" is based upon the extrapolation of monthly lease production curves drawn on cordinate paper; the 100 percent estimated future production amounts to 8,203,000 barrels.

This estimate, derived from individual lease curves, has been checked with a yearly field curve of all the wells producing in the "old area." This curve, plotted on log-log paper, indicates a future production of 8,200,000 barrels, which is an excellent check on the sum of the individual lease curves. The summary schedule of the 100 percent estimated future production of the leases in the "old area" is as follows:

The "new area" of the Elwood oil field is separated from the "old area" by a saddle. The wells on State lease No. 98 produce from this saddle area. The wells on State leases Nos. 129 and 208 have insufficient past history to use production curves on a basis for estimating future production.

It is necessary, therefore, to estimate the future production by the volumetric method. As this report is concerned with proved reserves, the following estimates of future production are for the productive limits of the "new area" as know on July 1, 1947, or thereabouts.

It is necessary, further, to divide the estimate of future production of the "new area" into two parts. Part 1 is for the Vaquerous zone reserves, and part 2 is concerned with the Sespe zone.

A volumetric estimate of proved reserves of the Vaquerous zone in the "new area," as of July 1, 1947, using the available core analysis data; would be as follows:

Subtracting the cumulative past production of the Vaquerous zone wells in the "new area," which amount to 1.908.473 barrels. leaves an indicated future production of approximately 16,803,000 barrels, as of July 1, 1947.

Subsurface well data available at this time indicates that the Vaqueros zone producing area will ultimately encompass a greater area than that used in the above volumetric estimate.

As additional wells are completed west of the present known productive limits, this estimate can be revised accordingly.

At this writing, three wells are producing from the Sespe zone in the "new area." Wells Nos. 129 S-1 and 208 S-1 are producing from an interval of equal stratigraphic depth; well 208-7 is producing from higher up in the Sespe

zone, and the performance of this upper Sespe interval has been disappointing. The writer is of the opinion that at this time it would be advisable to defer making an estimate of future production of this upper Sespe interval (as now being produced in well 208-7) until there is more reliable production performance and additional drilling to assist in evaluating this horizon.

The following volumetric estimate of reserves for the Sespe zone considers only the interval as presently known and producing in wells 129 S-1 and 208 S-1.

The total past production of the Sespe zone, to June 30, 1947, amounts to 34,862 barrels. Subtracting this figure from the estimate in the above computation indicates an estimated future production from the Sespe zone of some 2,168,000 barrels.

HUNTINGTON BEACH OIL FIELD

There are two principal producing horizons in the tideland portion of the Huntington Beach oil field; the upper is known as the Jones zone, and the lower, the Main zone.

At the westernmost part of the field the producing sands consist of stringers between the Jones zone and the Main zone.

The following discussion of proved reserves will be divided into three separate categories, and a summary schedule for the estimates of future production would be as follows:

The uppermost producing horizon in the tideland portion of the Huntington Beach oil field; namely, the "Jones" zone, has an insufficient production history to be applicable to the decline curve method of estimating oil reserves.

It is necessary, at this time, to rely on the volumetric method in arriving at an estimate of future production. The following calculation by the volumetric method considers the presently known available core analysis data:

Subtracting the past production of all Jones zone wells, which amounts to 11,940,171 barrels, leaves an estimated future production of 45,471,271 barrels. For the purpose of this report this figure is adjusted to 45,471,000 barrels. This estimate of Jones zone reserves, as of July 1, 1947, indicates that 79 percent of the estimated ultimate recoverable oil remains to be produced.

The first production from the tideland portion of the Huntington Beach oil field was from the Main zone. To June 30, 1947, the cumulative past production of this zone amounted to 79,334,408 barrels. All the early completions produced et open-flow rates, and it is possible to construct a family curve from the production records of many of these wells.

By the use of this family curve, the writer has estimated that the future production of the known productive limits of the Main zone, as of July 1, 1947, is 75,948,000 barrels. This estimate includes the present producing wells and proved, undrilled locations.

A summary schedule of this estimate is as follows:

It is possible to check a portion of the above estimate by means of the volumetric method. Sufficient data is available on the wells operated by the Southwest Exploration Co. to make a reasonable comparison to the ultimate production of 86,825,951 barrels as shown above.

This figure of ultimate production is to be compared with the estimate made by aid of the family curve referred to above. These two estimates check within approximately 1 percent of each other.

The development of the stringers of oil sand which are between the Jones and Main zones is confined to an area at the western limits of production in the tideland portion of the Huntington Beach oil field.

More specifically, the present production is from wells of the Signal Oil & Gas Co. under State oil and gas lease No. P. R. C. 163.

The following estimate of future production is based on curves from the present producing wells:

It is possible, by assuming certain factors (based on core analysis data of the Jones and Main zone sands), to check the estimate of ultimate production on the Signal Oil & Gas Co. leases No. P. R. C. 163. The following computation may be considered a reasonable check of a portion of the foregoing estimate:

This estimate is to be compared with the estimate of 5,690,456 barrels determined from a production-curve basis.

0.8696

_acre-feet__

3,532

0.20

__acre-feet__

706

7,758

.__barrels__5, 477, 150

RINCON OIL FIELD

It is herein estimated that the 100 percent future production from the tideland wells in the Rincon oil field, as of July 1, 1947, is 6,655,000 barrels.

A summary schedule of past production and estimated future production, by leases, is as follows: