Dissertation/Thesis Abstract

Principal stress analysis of rock fracture data from the Long Beach oil field, Los Angeles basin, California
by Chavez, Jacqueline A., M.S., California State University, Long Beach, 2015, 136; 1587889
Abstract (Summary)

Twelve electric borehole-image logs from oil wells located in the Long Beach oil field were used to conduct a fracture analysis of principal stress orientations associated with the Newport-Inglewood Fault Zone. The fractures analyzed are located in the Puente, Repetto, Pico, and San Pedro formations. Fractures were grouped based on fracture type, orientation, and formation. In-situ SHmax orientation was interpreted to range between 320° to 40°. Variations form the in-situ stress were observed across every formation and interpreted as paleo-stress. The SHmax orientation begins to change from NW to N-NW in the Pico Formation, which may signal the onset of the dextral movement of the Newport-Inglewood Fault 2.5 million years ago or later. The NE SHmax orientation in the San Pedro Formation may reflect stress trajectory changes as the Newport-Inglewood Fault continues to propagate in the Pleistocene. Additional SHmax orientations indicate a more complex structural evolution of stress trajectories.

Indexing (document details)
Advisor: Kelty, Thomas
Commitee: Becker, Matthew, Camacho, Hilario
School: California State University, Long Beach
Department: Geological Sciences
School Location: United States -- California
Source: MAI 54/04M(E), Masters Abstracts International
Subjects: Geology
Keywords: Fractures, Long beach oil field, Los angeles basin, Newport-inglewood fault, Principal stress
Publication Number: 1587889
ISBN: 978-1-321-72340-3
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