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ParaGeo files [dataset] Open Access

The East Coast Basin (ECB) is a complexactive convergent marginof the North Island of New Zealand, where high overpressures in the Cretaceous to Recent stratigraphy have evolved and often near lithostatic pressures can be encountered at shallow burial depths (<300 m). This study investigates the controls on overpressure generation and direct changes in mechanical properties of the sedimentary rocks as a result of rapid burial, uplift, active tectonic compression, and changes in effective stress. A regional investigation, which included analysis of the Cretaceous to Pleistocene tectono-stratigraphy, was combined with 2D and 3D seismics and well-log interpretation to understand the structural, stratigraphic and sedimentation history of the ECB and thus the main factors that could have contributed to overpressure generation and dissipation. 1D hydro-mechanical models, which capture the geological histories, were built for five key wells across the ECB to investigate the overpressure contribution generated by disequilibrium compaction and tectonic compression. Results show that the overpressure registered is significantly driven by tectonic compression as a result of the subduction of the Pacific Plate beneath the Australian Plate from the Pliocene to present-day (~6 Ma). Disequilibrium compaction has played a secondary role in overpressure generation (up to 3 MPa at 2,000 m depth). Tectonic and unloading events (e.g., erosive events) have an impact on the sediment mechanics of low permeability intervals, which are critical factors as these intervals could have changed their properties from elastic to plastic, increasing the risk of failure.

Descriptions

Resource type

Dataset

Contributors

Contact person: Jones, Stuart ¹
Editor: Jones, Stuart ¹
Creator: Calderon Medina, Erika ¹
Contact person: Calderon Medina, Erika ¹
Data collector: Obradors-Prats, Joshua ²
Editor: Aplin, Andrew ¹
Editor: Rouainia, Mohamed ²
Editor: Crook, Anthony ³

¹ Durham University, UK
² Newcastle University, UK
³ Three Cliffs Geomechanical Analysis, UK

Funder

This project was conducted as part of the GeoPOP4 group, an industry-supported research consortium funded by BP and Petrobras together with Durham University and the University of Newcastle.
The GeoPOP4 group also acknowledged the support of the New Zealand Petroleum and Mine Online Exploration Database (NZPAM) and the New Zealand Crown Research Institute (GNS) for permission to use the data.

Research methods

Other description

Keyword

ParaGeo files for models
Overpressure mechanisms
Geo mechanics

Subject

Geothermal resources
Sedimentary basins

Location

New Zealand

Language

Cited in

https://etheses.dur.ac.uk/15487/

Identifier

ark:/32150/r21c18df86c
doi:10.15128/r21c18df86c

Rights

Creative Commons Attribution 4.0 International (CC BY)

Publisher

Durham University

Date Created

File Details

Depositor

S.J. Jones

Date Uploaded

8 October 2024, 21:10:58

Date Modified

9 October 2024, 11:10:11

Audit Status

Audits have not yet been run on this file.

Characterization

File format: zip (ZIP Format)

Mime type: application/zip

File size: 1151224

Last modified: 2024:10:08 22:52:36+01:00

Filename: ParaGeo Files.zip

Original checksum: 572b80b77227def1d1372a48d4aeaa1b