Structural analysis of the Gamma closure, northern Horda Platform

Introduction

The northern Horda Platform (Fig. 1) consists of multiple tilted fault blocks that formed by rifting in the Permo-Triassic and later reactivation in the Jurassic-Cretaceous. Towards the east of the Platform, Mesozoic rocks (Triassic and Jurassic) provide potential fault-bound storage prospects for CO2 injection and storage. The Gamma (also known as Gladsheim) structure (Fig.1) was drilled in October 2019 and found to be dry. As such, the structure now offers potential for CO2 storage along with two other structures (Alpha and Beta), all of which are contained within the Smeaheia fault block.

Aims

This project will undertake a complete structural analysis of the Gamma closure in order to access the suitability of the structure for CO2 containment.

Objectives

• Depth convert seismic data utilizing a newly generated velocity model (Fig. 1).
• Generate a high-resolution 3D geomodel of the Gamma structure from seismic interpretation.
• Discern if trapping structures and continuous caprock are present for both the Triassic and Jurassic intervals.
• Discern volumetric capacity of the proposed storage formations.
• Generate and visualise comprehensive fault displacement and attributes (e.g. strike, dip, curvature) analyses in order to inform fault complexity and segmentation history.
• Conduct across-fault juxtaposition analysis of storage and caprock formations.
• Discern seal/baffle capacity of faults intersecting the storage formations utilising shale gouge algorithms
• Assess the reactivation potential for faults that intersect the Gamma closure.

Data

The project will utilize densely spaced 2D seismic data that covers the Gamma structure (Figure 1). Additional 3D seismic data may also become available. Well-log data from surrounding areas are accessible, with additional data becoming available at later stages. Reactivation parameters will be synthesized from literature and industry reports.

Tools and Method

Initial seismic interpretation will be conducted using SchlumbergerPetrel E&P software platform. Fault models will be exported to Petex Move and/or Badley’s T7 for analysis (e.g., juxtaposition, shale-gouge, and reactivation).

Learning Outcomes

Proficiency using Schumberger Petrel E&P Software Platform and PetexMove/Badley’s T7. In-depth knowledge of fault-analysis. Independent research, academic writing and presentation skills.

Additional details

This project is affiliated with Task 9 of the NCCS centre, international research cooperation on CO2 capture, transport and storage (CCS).