In-situ stress and pore pressure in the South Eugene Island field, Gulf of Mexico

T. Finkbeiner*, M. D. Zoback

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

6 Scopus citations

Abstract

Analysis of minifracs and pore pressure surveys from sand reservoirs in a Gulf of Mexico oil field show effective stress ratios, K, that scatter significantly and do not correlate with previously published fracture gradient models for this area. The lower-bound value of K is 0.33, which corresponds to the expected value for Coulomb failure for a coefficient of friction of 0.6 in normal faulting environments. However, in some sands K approaches unity, thus indicating an essentially isotropic stress field. Hence, the data indicate a highly variable state of stress that cannot be simply related to depth or pore pressure, but appears to reflect an interaction between deformational processes and material properties. Borehole breakout analysis in vertical wells reveals stress orientations that are predominantly perpendicular to normal faults and, hence, consistent with an extensional stress regime. Analysis of breakouts in inclined wells in two sand reservoirs allows to constrain the magnitude of the maximum horizontal principal stress, SHmax, and further indicates an active normal faulting environment with a clear, but small degree of horizontal stress anisotropy (i.e., Sv > SHmax > Shmin).

Original languageEnglish (US)
Title of host publicationProceedings of the SPE/ISRM Rock Mechanics in Petroleum Engineering Conference
PublisherSoc Pet Eng (SPE)
Pages69-78
Number of pages10
Volume1
StatePublished - 1998
Externally publishedYes
EventProceedings of the 1998 SPR/ISRM Rock Mechanics In Petroleum Engineering, EUROCK. Part 1 (of 2) - Trondheim, Norway
Duration: Jul 8 1998Jul 10 1998

Other

OtherProceedings of the 1998 SPR/ISRM Rock Mechanics In Petroleum Engineering, EUROCK. Part 1 (of 2)
CityTrondheim, Norway
Period07/8/9807/10/98

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)
  • Engineering(all)

Fingerprint Dive into the research topics of 'In-situ stress and pore pressure in the South Eugene Island field, Gulf of Mexico'. Together they form a unique fingerprint.

Cite this