Lithology Estimation by Full Wave Sonic and 3-D Seismic Data at the Mississippian Pennsylvanian Boundary of Western Osage County, Oklahoma
We analyze 3D seismic and well log data in Western Osage County, Oklahoma for insight to
lateral variation of thickness and lithology in the ‘Miss Chat’ interval at the Mississippian-
Pennsylvanian contact. The Chat refers to the section at the top of the Mississippian, which is
variously interpreted as a chert-rich paleosol, collapse breccia, and/or tripolitic chert. We use
high-quality 3D post stack seismic data and calibration from a deep well in the survey area, that
includes full wave sonic, density, and a modern log suite to generate a precision synthetic
seismogram tuned to the Miss-Penn boundary by suitable wavelet extraction. To quantify the
Miss-Penn contact, post stack impedance inversion is generated from a lower Pennsylvanian
horizon to the upper Arbuckle. Well log acoustic impedance data from the well in the survey
various lithologies present in the vicinity of the contact (sandstone, shale, limestone, chert).
The full wave sonic log allows acoustic impedance results to be statistically mapped into other
elastic parameters as needed to aid with lithology identification. These are used to interpret the
field data impedance inversion results to estimate lithology of the Chat across the 45 square
mile 3D seismic survey.
AAPG Datapages/Search and Discovery Article #90350 © 2019 AAPG Annual Convention and Exhibition, San Antonio, Texas, May 19-22, 2019