Dual-lateral horizontal wells successfully target bypassed pay in the san andres formation,vacuum field,New Mexico

摘要

This case study of the san andres formation in the mature Vacuum field,new mexico,shows how seismic data can be used to target bypassed pay with horizantal wells.These dual-lateral wells were the first attempt at horizontal development in the Vacuum san Andres field and in the San Andres Formation in New Mexico.The primary reservoire facies consist of ramp crest and outer ramp dolomitized peloidal packatones,skeletal and ooid grainstones,and fuslinid packstones.Vertical facies successions form numerous highfrequency carbonate depositional cycles and cycle sets that create distinct reservoir zones.Structural blocks created by small-scale faults (<=25 ft[8m]vertical displacement)and bypassed pay located in thin deposistional cycles were identified with three-dimensional compressional-wave seismic amplitude and coherency volumes and well data and targeted using medium-radius horizontal wels.Horixontal wells penetrated fault blocks and depositional cycles that were not adequately drained by existing vertical wells.Production curves show a significant increase in productin from the horizontal wells and no interference wtih production from offset vertical wells.This suggests that the faults are partially sealing.