Abstract: Seismic
Detection of the Rose Run in Southcentral Ohio
James Morris
With sparse well control along the Rose Run subcrop fairway in southcentral Ohio, exploration for Rose Run sand remnants is seismic
dominated. The purpose of this paper is to describe a method for acquiring high resolution dynamite
seismic
data
, and to discuss
interpretation
techniques for identifying remnants and predicting reservoir parameters.
Seismic
acquisition parameters for maximizing Rose Run remnant signatures in the 3,000 to 4,000 foot depth range of southcentral Ohio include small charge arrays, 75 foot station intervals, and a 27 hertz lowcut field filter. To maximize temporal and spatial resolution in the processing sequence, wavelet processing to zero phase, and post stack spectral whitening are most critical.
Since seismic
reflections are complex composites of many formation contacts, exact identification of reflection events using synthetic seismograms is crucial to understanding remnant
seismic
signatures. Follow up with two dimensional well log interpolation modeling gives a clearer understanding of what indicators to look for, and which attributes to measure for reservoir prediction.
By retaining a wide temporal bandwith with frequencies in our target zone in the 100 hertz range, maximum information can be extracted from our seismic
sections in the
interpretation
stage. Within this Rose Run subcrop area of Ohio,
seismic
remnant indicators include, rollover of reflectors above, reflector sag below, and event pull-up at the unconformity with an associated amplitude anomaly. With a reference well for calibration, measurement of these indicators is used to estimate sand presence and thickness.
AAPG Search and Discovery Article #90954©1995 AAPG Eastern Section, Schenectady, New York