305-pp13 - UNIVERSITY OF SOUTH ALABAMA Last Time Seismic...

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GY 305: Geophysics GY 305: Geophysics Lecture 13: Lecture 13: Sequence Stratigraphy 1 Sequence Stratigraphy 1 UNIVERSITY OF SOUTH ALABAMA Last Time Last Time Seismic Stratigraphy More on Sonic Logs (AKA Acoustic logs) More on Synthetic seismic profiles More on Seismic sections (how they work) More on Interpretations of seismic sections Peter Vail Side Scan Sonar Side Scan Sonar ht p:/ www.abc.se/~m10354/mar/img/sture/system2.jpg Sideways looking sonar developed in the 1960s. Has the ability to locate interesting features on the sea floor ht p:/ www.l-3klein.com/image_gal ery/530_images/scours/scours.html Iceberg scars of the Newfoundland coast Side Scan Sonar Side Scan Sonar High Tech High Tech “Sonar Sonar ” Techniques Techniques •GLORIA: First deployed in the 1980’s •Capable of surveying 18,000 km 2 per day •50 m resolution High Tech High Tech “Sonar Sonar ” Techniques Techniques •TOBI: First deployed in the late 1980’s •Capable of 70 m penetration •2 m resolution
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Sonic Logs ht p:/ www.spwla.org •Sonic (acoustic logs) display the travel time of P-waves through a formation. •The tool emits a sound wave that travels from the source (T) to the formation and back to receiver(s) (R). •It is used to establish baseline seismic wave transmission data (e.g., to produce synthetic seismic profiles ) Sonic Logs Ultimately, we are going to have to interpret reflection characteristics of rock units. Consider controls on reflection strength and polarity… ht p:/ pangea.stanford.edu/~sklemp/bering_chukchi/images/seismic.section.gif Recall from an earlier lab… •Acoustic impedance of a formation (1) is simply defined as:
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This note was uploaded on 02/05/2012 for the course GLY 305 taught by Professor Staff during the Fall '10 term at S. Alabama.

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305-pp13 - UNIVERSITY OF SOUTH ALABAMA Last Time Seismic...

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