Gas Production from the Lower Mannville

Gas production from the Lower Mannville is widespnead throughout southern, central and western Alberta and northeast B.C. imunediately adjacent to the Peace River Block. There are many small fields which consist of numerous isolated gas pools. Negligible Lower Mannville gas production is found in northern Alberta, northernmost B.C or central or eastern Saskatchewan. Included are fields producing from the Ellerslie, Basal Quartz, Gething, Cadomin, Sunburst, McMurray, Dunlevy, Ostracod, Cut Bank, Cantuar Sand and Detrital.

There are 85 Lower Mannville gas fields, including 11 an B.C., with Initial Established Marketable Gas Reserves of over 1000 x 10⁶m³ (35 BCF). The ten largest Lower Mannville gas fields, listed in order of Initial Established Marketable gas reserves, are shown rn Table 1. Cumulative production data for Alberta and British Columbia are updated to the end of 1990 and for Saskatchewan to the end of 1989.

Table 1. Ten Largest Lower Mannville Gas Fields (in units of 10⁶m³).

**Initial Established**
No.	Field	Formation	No. of Pools	Marketable Reserves	In-place Volume	Cumulative Production	Discovery Year
1	Gilby	Basal Mnvl	39	13,830	19,775	8,896	1953
2	Caroline	Basal Mnvl	113	12,922	19,776	3,046	1956
3	Rigel	Dunlevy	3	12,221	13,684	9,803	1955
4	Buick Creek	Dunlevy	9	9,729	10,816	7,930	1954
5	Kaybob South	Geth/Cadmn	43	8,550	11,473	2,521	1956
6	Wapiti	Cadmn/Geth	39	7,086	11,477	321	1958
7	Medicine River	BslQtz/Ost	54	6,474	10,604	2,353	1953
8	Edson	Gething	14	5,958	7,970	4,214	1963
9	Elmworth	Cadomin	20	5,636	9,354	91	1977
10	Sylvan Lake	LMnvl/Ost	50	5,574	7,763	1,858	1958

All of these fields are in central or western Alberta except for Rigel and Buick Creek in B.C. Lower Mannville gas production is primarily derived from stratigraphic traps developed in valley-fill sands on the underlying Pre-Cretaceous unconformity.

Total recoverable gas reserves in the Lower Mannville ane estimated at 316.8 x 10⁹m³, of which 81.6 x 10⁹m³ have already been produced. Initial Estabhshed In-Place Volume of Lower Mannville gas reserves totals 476 x 10⁹m³. There are a total of 4452 Lower Mannville gas pools, with an average 71 x 10⁶m³ recoverable gas reserves/pool. Table 2 lists the distribution of Lower Mannville gas reserves according to In-Place Pool Size.

Table 2. Size Distribution of Lower Mannville Gas Pools (in units of 10⁶m³).

In-Place Pool Size Class	No. of Pools	Recoverable Reserves	Cumulative Production
1.0 to 10	598	1,955	609
10 to 100	2861	74,373	10,140
100 to 1000	939	149,392	42,861
1000 to 10000	54	91,079	27,938
over 10000	-	-	-
Total	4452	316,799 x 10⁶m³	81,550 x 10⁶m³

Last modified: August 15, 2008