DETERMINATION OF FAULT SLIP COMPONENTS USING SUBSURFACE STRUCTURAL CONTOURS: METHODS AND EXAMPLES |
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| Authors: | S-S. Xu,L. G. Velasquillo-Martinez,J. M. Grajales-Nishimura,G. Murillo-Muñ etó n,J. Garcí a-Hernandez,A. F. Nieto-Samaniego |
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| Affiliation: | Instituto Mexicano del Petróleo, Programa YNF, Eje Central Lázaro Cárdenas No. 152, Col. San Bartolo Atepehuacán, C. P. 07730, Mexico D. F., Mexico.;Petróleos Mexicanos Exploración y Producción Región Marina NE, Activo Cantarell (PEP-RMNE), Cd. del Carmen, Campeche, Mexico.;Universidad Nacional Autónoma de México, Centro de Geociencias, Apartado Postal 1–742, Querétaro, Qro., 76001, Mexico. |
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| Abstract: | Problems with measuring fault slip in the subsurface can sometimes be overcome by using subsurface structural contour maps constructed from well logs and seismic information. These maps are useful for estimating fault slip since fault motion commonly causes the dislocation of structural contours. The dislocation of a contour is defined here as the distance in the direction of fault strike between two contours which have the same value on both sides of a fault. This dislocation can be estimated for tilted beds and folded beds as follows: - (i)
If a dip-slip fault offsets a tilted bed, the dislocation (Sc) of contours can be estimated from the vertical component (Sv) of the fault slip and the dip (β) of the bedding according to the following relationship: Sc= Sv/tan β. Since Sc and β can be measured from a contour map, the vertical component of fault slip can be obtained from this equation. If a strike-slip fault offsets a tilted bed, the dislocation (Scs) of contours is equal to the strike-slip of the fault (Sc), that is, Scs= Ss.
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