E. Texas Upper Jurassic reefs: An expanding Cotton Valley lime play

Scott L. Montgomery Petroleum Consultant Seattle Gus Wilson Saker Geological Services Houston Dan Ziegler SK Resources Houston Keith Hatch Sigmund, Kane & Hatch Inc. Houston Exploration for gas reserves in reefs of the Upper Jurassic Cotton Valley Lime (Haynesville) interval, East Texas basin, provides an excellent example of a frontier play in a maturely drilled province. Small, pinnacle-shaped reef bodies, 15-100 acres in area and 250-650 ft or more in height, were not known to exist in East Texas prior to their serendipitous discovery in the early 1980s despite the existence of over 900 wells penetrating the Cotton Valley Lime interval....

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