The Depositional Environment of the Eocene Singer Sand in Southwest Beauregard Parish, LA

Samantha E. Leone
University of Louisiana at Lafayette

An interpretation of geological and geophysical data was completed for the Eocene Age Singer Sand in southwest Beauregard Parish, LA. The Singer Sand is a member of the Cockfield Formation. In this study the structure and stratigraphy of the Singer Sand was determined through the interpretation of well logs and 3D pre-stack time migrated seismic data using the IHS Kingdom suite.

The Singer Sand was interpreted where it is present within the study area. All faults in the area, both syndepositional and post-depositional, were found to be normal faults. The syndepositional faults strike parallel to the coastline and display growth on the downthrown side of the fault. The SP and resistivity responses on the electric logs were used to delineate the extent and thickness of the sand as well as to help determine the depositional environment. Amplitude variation with offset (AVO) seismic volumes were studied to confirm the location and thickness of sands in the study area. Similarity volumes were also used to delineate the extent of the Singer Sand. Net sand isopach and structure maps derived from well logs were compared with equivalent maps constructed from the seismic data to confirm the interpretations and correct for discrepancies between the two types of data.

The Singer Sand was interpreted to be a shelf sand bar complex. By integrating seismic interpretations, AVO offset volumes, similarity volumes, and well log information net sand maps were produced to better understand the depositional environment of the Singer Sand within the study area.

AAPG Search and Discovery Article #90182©2013 AAPG/SEG Student Expo, Houston, Texas, September 16-17, 2013