Microseismic activity observed during depressurization of an oil storage cavern in rock salt

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In November 1978, the Los Alamos National Laboratory installed a triaxial downhole geophone package at the Bryan Mound Strategic Petroleum Reserve, a salt dome near Freeport, Texas. Monitoring was for the purpose of detecting microseismic activity during the depressurization of one of the oil storage caverns. Seismic activity started soon after the start of depressurization, reached a peak 5 days later, and rapidly died off. Nineteen locatable microearthquakes with magnitudes between -1 and -2 were observed during and after depressurization. All but two of these events were located near the side of the oil storage cavern. Because the shear-wave spectra ... continued below

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Pages: 13

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Albright, J. & Pearson, C. January 1, 1981.

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Description

In November 1978, the Los Alamos National Laboratory installed a triaxial downhole geophone package at the Bryan Mound Strategic Petroleum Reserve, a salt dome near Freeport, Texas. Monitoring was for the purpose of detecting microseismic activity during the depressurization of one of the oil storage caverns. Seismic activity started soon after the start of depressurization, reached a peak 5 days later, and rapidly died off. Nineteen locatable microearthquakes with magnitudes between -1 and -2 were observed during and after depressurization. All but two of these events were located near the side of the oil storage cavern. Because the shear-wave spectra of these events were characterized by well-defined corner frequencies we were able to calculate the radius of the rupture surface, the seismic moment, and the stress drop from the source spectra. Estimates of the source radius vary from 15 to 100 m, stress drops range from 0.3 to 0.01 bar, and seismic moments range from 3 x 10/sup 14/ to 3 x 10/sup 15/ dyne/cm. Important conclusions from this study are that comparatively small changes in the internal pressure of oil storage caverns may be enough to cause failure in the salt near the cavern walls and that downhole microseismic surveys can locate zones near large underground excavations that are undergoing rock failure.

Physical Description

Pages: 13

Notes

NTIS, PC A02/MF A01.

Source

  • 3. conference on acoustic emission/microseismic activity in geologic structures and materials, University Park, PA, USA, 5 Oct 1981

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  • Other: DE81030237
  • Report No.: LA-UR-81-2622
  • Report No.: CONF-811036-1
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 6175946
  • Archival Resource Key: ark:/67531/metadc1110987

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • January 1, 1981

Added to The UNT Digital Library

  • Feb. 22, 2018, 7:45 p.m.

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  • May 30, 2018, 6:06 p.m.

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Albright, J. & Pearson, C. Microseismic activity observed during depressurization of an oil storage cavern in rock salt, article, January 1, 1981; New Mexico. (digital.library.unt.edu/ark:/67531/metadc1110987/: accessed December 12, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.