Insights into the Development of the Ghana Transform Margin and Its Future Play Potential

Insights into the Development
of the Ghana Transform Margin
and Its Future Play Potential

Insights into the development of the Ghana Transform Margin and its future play potential

June 3 | 9:00 AM CDT - Insights into the Development of the Ghana Transform Margin and Its Future Play Potential
Presented by Neil Hurst

In 2018, ION acquired the WEASPAN 2D survey, offshore Ghana. The data are imaged to 40 km depth allowing the entire sedimentary section and crustal structure to be mapped across the whole of offshore Ghana. In the Tano Basin, the data reveal the presence of large syn-rift sediment thicknesses accommodated by large throw pull-apart faults that clearly offset the Moho where they intersect. The data show that crustal thickness varies significantly and is extremely low over large parts of the Tano Basin.

To date, discoveries in the Tano Basin have been found in post-rift U. Cretaceous turbidites within structural-stratigraphic traps. Source rocks are post-rift Cenomanian-Turonian shales and late syn-rift Albian shales (Dailly et al. 2017). Additional syn-rift source rocks are likely to be present including L. Cretaceous sampled in the shallow-water Tano Basin and pre-rift Mid to U. Devonian shales encountered in the Saltpond Basin.

We show clear evidence of fluid escape from below the Albian Unconformity that are potential hydrocarbon migration routes from the syn- to post-rift section. Basin modelling highlights areas where syn-rift source rocks are mature for hydrocarbon generation. Within these areas there is potential for deeper syn-rift hydrocarbon plays with reservoirs in structural traps formed during compression.


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