--> Structural Origin of Henderson Dome: Stratigraphic & Geophysical Study of an Upper Ordovician Impact Crater

AAPG Eastern Section Meeting

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Structural Origin of Henderson Dome: Stratigraphic & Geophysical Study of an Upper Ordovician Impact Crater

Abstract

Henderson Dome is an anomalous 8km wide, roughly circular structural oil & gas field in Mercer Co, PA. Earliest production goes back more than a century in the Upper Devonian sandstones which are now used for gas storage. Deeper production from the Upper Silurian Lockport Dolomite is more notable, as commercial accumulations are uncommon outside of this field. The crest of the dome structure does not migrate with depth, though there is evidence of erosional beveling inferred from the absence of regionally persistent formations in the Lower Silurian and Upper Ordovician. Previous interpretations suggested deformation in the Cambrian basement that was linked to several speculative origins for the field. Stratigraphic analysis of Silurian formations suggest intermittent vertical reactivation of faults within the dome that may be related to Appalachian basin orogenic episodes.

With the help of modern 2D seismic data, the origin of this uplift can be linked to a late Ordovician disturbance that mimics the outline of the dome. This presentation will discuss evidence that this disturbance resulted from an ancient meteorite impact during the Ordovician. This study details how this impact may have caused the uplifted section seen throughout the Silurian and Devonian that defines Henderson Dome.