Effects of Physical Processes and Sampling Resolution on Fault Displacement Versus Length Scaling: The Case of the Cantarell Complex Oilfield, Gulf of Mexico

Autor: L. G. Velasquillo-Martinez, J.M. Grajales-Nishimura, Gustavo Murillo-Muñetón, Shunshan Xu, Susana A. Alaniz-Álvarez, Ángel F. Nieto-Samaniego
Rok vydání: 2015
Předmět:
Zdroj: Pure and Applied Geophysics. 173:1125-1142
ISSN: 1420-9136
0033-4553
Popis: In this paper, we first review some factors that may alter the fault D max /L ratio and scaling relationship. The three main physical processes are documented as follows: (1) The D max /L ratio increases in an individual segmented fault, whereas it decreases in a fault array consisting of two or more fault segments. This effect occurs at any scale during fault growth and in any type of rock. (2) Vertical restriction decreases the D max /L ratio along the fault strike due to mechanical layers. (3) The D max /L ratio increases or decreases due to fault reactivation depending on the type of reactivation. Thus, using data from the normal faults of the Cantarell oilfield in the southern Gulf of Mexico, we document that the displacement (D max ) and length (L) show a weak correlation of linear or power-law scaling, with exponents that are much less than 1 (n ≈ 0.5). This scaling relation is due to the combination of the physical processes mentioned above, as well as sampling effects, such as technique resolution. These results indicate that sublinear scaling (n ≈ 0.5) can occur as a result of more than one physical process during faulting in a studied area. In addition to the physical processes associated with brittle deformation in the studied area, the sampling resolution dramatically affects the exponents of the D max –L scaling.
Databáze: OpenAIRE
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