16 March 2017 | Oamaru, New Zealand
“Basaltic volcanism on a carbonate shelf: facies and diagenesis"
Open to GTW Delegates, this field trip is available exclusively as a part of this Geosciences Technology Workshop and will demonstrate how volcanism has affected geological structure and depositional and diatenetic facies in the vicinity. As an example, see Thompson et al, 2014: "The on cool-water carbonate facies during maximum inundation of Zealandia in the Waitaki-Oamaru region. New Zealand Journal of Geology and Geophysics" 57:2, 149-169. Read here.
This trip to the outcrop localities will show the features observed in seismic sections and exploration wells offshore in the late Cretaceous and Tertiary Caterbury basin. This opportunity enhances the focus of this GTW:
- Volcanic and igneous intrusive structures in sedimentary basins: morphology and modes of emplacement
- Igneous activity, source rock maturation and charge
- Volcanic and volcaniclastic oil and gas reservoirs
- Reservoir quality of conventional reservoir systems in conjunction with magmatic systems
Field Trip Details
The field trip is organized privately by the technical committee. Registration for the field trip is open only to GTW Delegates and should be made when registering for the GTW. Registration fee will be available soon.
The field trip will visit local outcrops of basaltic pillow lavas, seamounts, and feeder dykes and sills into an Oligocene carbonate shelf. Features similar to those seen in outcrop can be observed in seismic sections and exploration wells offshore in the late Cretaceous and Tertiary Canterbury basin and so are representative of the effects of volcanism on the petroleum system. The pyroclastic deposits around the seamounts may function either as reservoirs or as seals and their emplacement clearly affected the distribution of carbonate reservoir facies around the seamounts on and around the volcanic platform. Local intrusions interact with carbonate minerals and seawater producing local to regional diagenetic changes possibly also affecting maturation. Delegates will be taken to outcrop localities that will show all of these features.
More details will be made available in due course.
Field Trip Information