Deformation Zones of the active wall of the S-shaped Strike-Slip Fault: Forward Modeling and Analysis

摘要

S-shaped strike-slip faults are superposition products of strike-slip and extensional effects, and the deformation zones of the active wall developed along which have been verified as hydrocarbon enrichment areas in many cases of petroliferous basins. Therefore, it is essential to predict the distribution of deformation zones caused by S shaped strike-slip fault. However, there haven't been methods that can accurately predict them. In this paper, an innovative modeling method is proposed. Firstly, the S-shaped strike-slip fault and strata on its both walls are modeled, strength of strike-slip and extension on which can be adjusted by varying oblique slip angles. Then the active wall of S-shaped strike-slip fault featured by strike slip-extensional, tensional-shear, and extensional-strike slip properties are conducted with forward modeling, based on results of which the distribution model of deformation zones of the active wall can be established. Meanwhile, strata deformation attributes are integrated, which demonstrates restraining and releasing zones as areas favorable for migration and accumulation of oil and gas.