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The AAPG/Datapages Combined Publications Database
Houston Geological Society Bulletin
Abstract
Abstract: The Shanghai Delta Complex -
A Glimpse of the
Expanded Yegua Trend
By
The Upper Eocene Yegua Formation expands dramatically
across a regional flexure generally twelve to fifteen
kilometers wide. During each of several postulated Yegua
sea level drops, this flexure became a focal point for deltaic
deposition of excellent reservoir-quality sands. From the
western edge of the Houston Salt Dome Basin to the San
Marcos Arch, this trend has yielded, since 1982, at least five
noteworthy discoveries - Toro Grande and Lost 
Bridge
Fields in Jackson County and Black Owl, Shanghai, and El
Campo Fields in Wharton County.
Shanghai and El Campo Fields are located within what the authors have labeled the Shanghai Delta Complex. Integration of seismic and well data in this vicinity shows a marked increase in the expansion indices of growth faults as well as other structural and stratigraphic patterns characteristic of deltas deposited on Gulf Coast Tertiary shelf margins.
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