Abstract

The prolific oil discovery in Fusselman dolomite by Enserch Exploration in June, 1978 ignited an exploration play on the Roosevelt Positive in Roosevelt County, New Mexico. Lambirth No. 1 flowed 638 BOPD on 1/4” choke on potential test and has produced nearly 2 MMBO and 1.5 BCFG. Energy Reserves Group (ERG) was poised to enter the play and started acquiring leases between the Enserch discovery and the known updip “granite knob” to the south based solely on subsurface geology.

ERG’s first well, Bledsoe No. 1, was drilled in March, 1980 and found the Fusselman truncated, but it was completed initially in a fractured granite zone that produced 3,334 BO. The well was plugged back to the Cisco limestone and recompleted as a gas producer. Vugular porosity in the Cisco/Canyon limestone is quite variable and is a large factor in reservoir quality within the anticlinal trap. The best Cisco/Canyon well is the ERG, El Paso-State No. 2 and it has produced over 6 BCFG and nearly 200,000 BO. ERG completed a total of 11 Cisco/Canyon wells in the South Peterson Penn field. Cumulative production from 16 producers in the field is 647 MBO and 13.4 BCFG.

ERG completed 3 Fusselman producers in South Peterson Fusselman field, a northwest plunging anticlinal nose where the trapping mechanism was created by updip truncation of the reservoir on the north flank of a “granite knob.” Two of these wells, Miller 10 Nos. 1 and 2, appear to be in a Fusselman truncation trap separated from the rest of South Peterson Fusselman field. Reported cumulative production from the field is 3.7 MMBO and 3.6 BCFG from 10 producers.