1887

Abstract

Summary

Faults have a strong impact on the fluid flow in sedimentary basins. In carbonated rocks, the role of faults is complicated. Indeed, when affected by a fault, the initial permeability of carbonate host-rocks is altered by secondary processes such as dissolution and cementation throughout the fault evolution. Thus, the current properties measured in field analogues are the outcome of a long-lasting fault history.

The goal of this study is to decipher the petrophysical evolution of faults during the last 130My. To this end, our study focused on the Castellas polyphase fault resulting from (1) the Durance Uplift (middle Cretaceous) and (2) the Pyrenean shortening (Late-Cretaceous-Paleocene). We made 13 high resolution cross-sections and a structural map to characterize the fault zone architecture. The diagenetic analysis on 62 thin sections in LPA and with cathodoluminescence evidenced 11 diagenetic stages that affected the carbonate host rocks over ∼130 My. This sequence highlighted that the fault zone petrophysical property results from the addition of multiple, alternating tectonic and diagenetic events.

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/content/papers/10.3997/2214-4609.201701649
2017-06-12
2024-03-29
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