WP2Geo-characterisation

This report presents the CO2 storage area in France to be fully characterised in PilotSTRATEGY and the target for the 3D seismic survey. This report also includes an inventory of available data in the selected area and a gap analysis.

Within the framework of the project “CO2 Geological Pilots in Strategic Territories (pilotSTRATEGY)”, a gravimetric survey was carried out with the aim of improving the knowledge of the Lopín structure (Ebro Basin ‐ onshore). This gravimetric study, allowed filling the existing gaps of information and represents the first step to carry on the development, monitoring and implementation of this potential Pilot Site.

This deliverable is a detailed report of the 3D seismic acquisition conducted in the Paris Basin – Grandpuits area for the PilotSTRATEGY project and preliminary seismic interpretation.

A full detailed explanation of the workflow and parameters used for seismic acquisition is presented in the current report. Design, permitting, acquisition, quality control and pre‐processing of the campaign were carried out by Smart Seismic Solutions (S³), third party partner of the project, from December 2021 to July 2022. The acquisition itself (layout of the receivers, vibration, collection of the receivers) took place over a period of only 5 weeks from mid‐May until the end of June.

This deliverable reports on the petrophysical data collected for all sites in France, Spain (offshore and onshore), Portugal and Greece. The source of information and sample gathering can be extremely variable: for France and Spain (onshore), well samples were available from the oil exploration period and in the case of Spain onshore, outcrop samples were analysed as well; in Spain offshore and Portugal, well log data were used essentially together with a few samples; in Greece, outcrop samples were used. For each region, a brief geological description is made to describe the formation target and the general context.

This report summarises the work conducted as part of work package 2, task 2.3 (Conceptual Geological Models) of the PilotSTRATEGY project that contributed to this Deliverable 2.7, Geological Models of the 3 areas. Much of the data collected in WP2.3 is not included here, but has been passed to PilotSTRATEGY work package 3, for the construction of static and dynamic digital reservoir models for the modelling of CO₂ injection and CO₂ behaviour in the storage complex. The 3 areas concerned in this report (Portugal, Spain, France) have worked semi‐independently on this WP, but with most collaboration between the 2 Iberian countries as the areas share some characteristics. All 3 areas use similar types of subsurface data (though of widely varying vintages and quality), and have utilised analytical techniques that are largely derived from the oil and gas exploration and production industry. With one offshore area, 2 onshore ones, and 1 carbonate reservoir and 2 clastic ones, the challenges of the areas vary considerably. Hence, each area is described separately, though similarities in methods will be seen. The report has a relatively short summary of each area, which is intended to be relatively easily read, followed by a more detailed Annex with a full description of data, methods and a summary of the results.

This document aims to provide additional information to complete the deliverable 2.7, task 2.3 of work package 2 (WP2, Geocharacterization) of the PilotSTRATEGY Project. Detailed description of the regional geological framework, including sedimentological, structural, and stratigraphical characterization is presented in section 3 – Regional Geological Characterization. The characterization of the storage complex is presented in section 4 – Storage Complex Characterization, and a comprehensive facies analysis of the reservoir and the seal in section 5 – Facies analysis. Section 6 includes the analysis of some outcrops, and in section 7 – Depositional Environments and Geological Conceptual Model, as a conclusion, the main deposition environments of the area of interest and some notes on the conceptual geological model, are stated.

The study area is situated near the southern edge of the Ebro basin, which is located in the northeastern region of the Iberian Peninsula. In particular, the study area lies near the northern boundary of the Aragonese branch of the Iberian Chain. This basin has a triangular shape and serves as the foreland basin for the Pyrenees, Iberian Chain, and Catalan Coastal Ranges located north, south, and east, respectively. The formation of the foreland basin commenced during the Paleocene, induced by flexural subsidence resulting from the development of these three mountain ranges (e.g. Pardo et al., 2004). Towards the central part of the Ebro Basin, the structure corresponds to a gentle syncline (the Ebro syncline, Quirantes, 1978), which was interpreted, based on surface (mapping and structural data) and subsurface (wells and seismic reflection data) data, as a bending fold that accommodated the slight reactivation of WNW-ESE basement faults originated at the beginning of the Mesozoic extension (Arlegui and Simón, 2001).

This document aims to provide a summary and guidelines to complete the deliverable 2.7 of the PilotSTRATEGY Project.

The deliverable 2.7 corresponds to the Work Package 2 (Geocharacterization) of task 2.3 ‐Conceptual Geological Models‐. It should materialize the sub task 2.3.2 whose objective is “to develop the geological models for the 3 areas of study; Geological model based on facies analysis from available cores and cuttings, field analogues, log analysis, surface data and depositional environments, integrated with seismic stratigraphic and structural interpretations where available”.

This deliverable reports on the geomechanical data collected for all sites in France, Spain (offshore and onshore), Portugal and Greece. The source of information and sample gathering can be extremely variable: for France and Spain (onshore), well samples were available from the oil exploration period; in Spain offshore and Portugal, well log data were used essentially together with a few samples; in Greece, outcrop samples were used. For each region, a brief geological description is made to describe the formation target and the general context.