The near-miss and discovery of the Shwe Gas Field Complex, offshore Myanmar

U3 Explore

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In late 2003, Daewoo International drilled the Shwe-1 exploration well in Myanmar's Rakhine Basin, targeting shallow amplitude anomalies (DHIs) but initially encountering gas traces in poor-quality sands and a deeper shale zone. A sidetrack well, drilled just 310m away, discovered over 60m of gas-bearing Pliocene sands, leading to the eventual discovery of over 5 TCFG across multiple biogenic gas fields. The reservoirs, located at depths of 2900-3300m, are complex stratigraphic traps formed by shingled turbidite lobes, with appraisal drilling over the next decade defining two key Pliocene intervals (G3.2 and G5.2) connected through extensive sand injection processes. Daewoo's comprehensive coring program was crucial in unraveling this intricate reservoir architecture. Production began in 2013 with wells SHD-K, SHD-G, and SHD-I, and subsequent discoveries in the Rakhine Basin include Thalin, Shwe Yee Htun, Mahar, and Shwe Pyi Htay.

Dr. Stephen Cossey is a geologist with a PhD from the University of South Carolina, who began his career in uranium and oil & gas exploration with Conoco and BP before founding Cossey & Associates Inc., a deepwater clastics consulting firm. Over the past 30 years, he has developed extensive deepwater field databases, conducted global field courses, and consulted for over 150 companies, with ongoing projects in Somalia, Belize, and Mexico.

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