Page 15: of Offshore Engineer Magazine (May/Jun 2025)

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MARKETS EXPLORATION iscovered in 2014, Chevron’s Anchor feld in the 80th–95th percentile range. Normalized over the targets Lower Tertiary Wilcox reservoirs at frst 90 days, Anchor wells exceed the Lower Tertiary aver- vertical depths of 30,000–34,000 ft. Four ap- age by 60–70%, placing them among the most productive

D praisal wells were drilled, including Anchor in the Gulf of America/Mexico basin to date.

#2, which encountered 690 ft of net pay across the Wil- The Inboard Lower Tertiary is characterized by elevated cox 1–4 sands. Anchor #3, drilled three miles northwest, pressures, with Anchor reaching 16,700 psi – this neces- confrmed a separate northern fault block, delineating the sitates the use of 20k-rated equipment. The Inboard play broader feld structure. features superior reservoir quality relative to the Outboard,

Two production wells were drilled in early-2023 and characterized by coarser-grained sands, higher porosity brought online in August 2024. Both were completed and permeability, and larger structural traps. In the central across approximately 890 ft of net pay, utilizing fve and six Inboard, the thick overlying salt complicates seismic imag- hydraulic fracturing stages respectively. Current produc- ing and drilling but moderates thermal gradients, creating tion is sourced from the Wilcox 1–3 intervals, with Wilcox a cooler HPHT regime at extreme depths. For reference, 4 targeted for future development. Core and log analyses Perdido well perforations average ~15,000 ft TVD, Out- indicate reservoir quality varies across the four sands, with board wells range from 25,000–28,000 ft TVD, while An- permeability ranging from 1 to 100 mD and porosity be- chor exceeds 30,000 ft TVD.

tween 18–24%.

Could We See Reserve Upgrades at Anchor?

Anchor well performance is Top Tier With two wells online and early production exceeding in the Lower Tertiary expectations, Anchor shifts into full-scale Phase 1 develop-

The initial Anchor wells compare favorably to recent ment. Five additional wells are planned over 2025-2027,

Lower Tertiary developments. A benchmarking analysis bringing the total to seven producers tied back to a 75,000 against a reference set of Outboard Lower Tertiary and Per- bbl/d semi-submersible FPU, focused on the southern dido felds (brought online within the past 15 years) shows fault block. Phase 2 will target the northern fault block

Anchor’s 3 and 6-month cumulative production volumes with up to four wells. Waterfooding remains a potential © Welligence Energy Analytics may/june 2025 OFFSHORE ENGINEER 15