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Pockmarks in Pliocene-Quaternary continental slope deposits offshore Angola show features related to: (1)
fluid leakage craters that formed repeatedly, (2) authigenic methane-derived carbonates that indicate the
(former) presence of hydrocarbons and (3) erosional--depositional structures that are clearly related to
current activity. Depending on topography, the...
A new type of gas chimney exhibiting an unconventional linear planform is found. These chimneys are termed “Linear Chimneys”, which have been observed in 3-D seismic data offshore of Angola. Linear Chimneys occur parallel to adjacent faults, often within preferentially oriented tier-bound fault networks of diagenetic origin (also known as anisotropic polygonal faults, PFs), in salt-deformational domains...
Supplementary materials for The Alternative Hypothesis Of Gas Chimney Formations In Hanging Walls – Fluid Migrations Along Pre-ExistingVertical Fractures in Section 5.2.4. of «Formation of linear planform chimneys controlled by preferential hydrocarbon leakage and anisotropic stresses in faulted fine-grained sediments, Offshore Angola»
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