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The AAPG/Datapages Combined Publications Database

AAPG Bulletin

Abstract


Volume: 63 (1979)

Issue: 5. (May)

First Page: 846

Last Page: 846

Title: Late Ordovician Stratigraphy and Sedimentation in Northern Appalachian Basin: ABSTRACT

Author(s): Earl H. Linn

Article Type: Meeting abstract

Abstract:

Recently drilled wells have led to a better understanding of the Upper Ordovician delta complex in the northern Appalachian basin. Regional cross sections and isolith maps show areas that should be favorable for natural gas exploration. The Upper Ordovician delta sequence preceded Medina deposition and was the first true geosynclinal deposition in the basin; in the western area, the formation is of marine origin and is principally sandstone. The area where the sandstones grade into shales and siltstones seems to be most favorable for future gas exploration. Past production has been influenced by regional tectonics as well as by stratigraphy and sedimentation. The occurrence and orientation of the fracture patterns are revealed by stream drainage patterns as well as by ign ous intrusive patterns. Detailed studies of this part of the basin should be rewarding to venturesome explorers. Drilling depths are shallow (1,800 to 3,200 ft; 540 to 960 m) and the potential reservoir rocks are thick (more than 600 ft; 180 m). Reserves are similar to other low-permeability reservoirs, and have become economically attractive owing to recent gas price increases.

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