E. Texas Upper Jurassic reefs: An expanding Cotton Valley Lime play
- Montgomery (Scott L.), Seattle, WA (United States)
- Saker Geological Services, Houston, TX (United States)
- SK Resources, Houston, TX (United States)
- Sigmund, Kane and Hatch Inc., Houston, TX (United States)
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. To date, reefs have been found productive along a fairway 6--10 miles wide and up to 75 miles long trending northeast through Robertson, Leon, and Freestone counties. The following report presents an introduction to the basic geology of the reef play. Debate exists among industry geologists as to the precise nature, origin, and occurrence of these reefs, which are characterized by considerable diversity. An attempt is made here to include mainly information about which some degree of consensus exists.
- OSTI ID:
- 533009
- Journal Information:
- Oil and Gas Journal, Vol. 95, Issue 38; Other Information: PBD: 22 Sep 1997
- Country of Publication:
- United States
- Language:
- English
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