Activities

0. Project management

Project management will include steering and control of Activities, communication with the Fund administrator on financial and legal matters, organising of project meetings and reporting to the Fund administrator. Project management will be done by CGS – Activity 0 leader, with the help of IRIS.

1. Mineralogy and geochemistry of reservoir rocks and seals

Shallow drilling for reservoir and sealing rock analogues near Brandysek, Central Bohemia. Credit: Richard Lojka/CGS

Laboratory analyses of borehole cores and cuttings will be performed with the aim to increase the knowledge of petrophysical, mineralogical and geomechanical properties of both collector rocks and unpermeable caprock that should "keep the CO2 down". The samples will be prepared by CGS, the analyses themselves will represent a common effort of both partners. IRIS will perform porosity and permeability measurements and geomechanical tests on samples of seal rocks. Porosity and permeability are crucial parameters influencing both the storage potential of the aquifer and the adequateness of the sealing while geomechanical properties of the caprock determine the maximum acceptable overpressure during CO2 injection. All the techniques described above will be a subject of know-how transfer from IRIS to CGS (mainly by means of a short study visit). The results will be summarised in a special report. The data obtained by the tests will represent valuable information for the modeling activities in Activity 2.

2. Integrated modeling of basin structures

Basin structure modelling represents an important step on the way from volumetric analyses towards simulation of CO2 injection and study of CO2 behaviour in the subsurface. Activity 2 will be focused on the following topics: Construction of the initial volumetric 3D model of the Ceska Kamenice Basin in ArcGIS environment (sub-activity 2.1). This basin is the only partial sub-basin of the Central Bohemian Permian-Carboniferous basins which has not been studied yet, despite of this promising CO2 storage potential. (Other 3 sub-basins – Zatec, Roudnice and Mnichovo Hradiste - have been studied within previous projects and basic volumetric 3D models of the aquifers are available.) The aim of the proposed work is to build the initial model of the aquifers using all existing data available (borehole data, well logs, geophysical and petrophysical data etc.). This would bring the Ceska Kamenice Basin on the same level of knowledge with the other three sub-basins and allow better comparison of their storage suitability and potential. This activity will be performed by CGS with advisory activity of IRIS. Sub-activity 2.2, planned for the first month of the project, should define the sub-basin that will be subject of further study under sub-activities 2.3 and 2.4. A multi-criterial analysis will be used to compare the 3 sub-basins studied within previous projects (especially EU GeoCapacity; see above) and select the most promising one. The comparison will be performed jointly by both partners. Development of the sequence-stratigraphic and basin evolution models using the PetroMod 10 software is subject of sub-activity 2.3. Subsidence, deposition, erosion, compaction and thermal maturation processes will be studied. The models will be calibrated by thermal maturity and petrophysical data. The work will be performed by CGS with help of IRIS; IRIS will especially contribute by modelling of temperature profiles using its Basin Modelling Tool (BMT). IRIS will be the leader of sub-activity 2.4. Using the Petrel reservoir simulation software, they will build a simplified geological model of the sub-basin selected in sub-activity 2.2. CGS will assist by providing available input data (strata geometry, petrophysical and lithological properties, etc.). Finally, the model will be used to build a simulation model to study the migration of carbon dioxide in the storage formation. Knowledge transfer is included in this sub-activity. The results will be summarised in a special report.

3. Research on CO2 storage in Czech oil and gas fields with optional CO2-EOR

This activity will be led by IRIS and represents a classical example of know-how transfer from donor country into a beneficiary country. IRIS will use its long-year experience and expertise in this area to help CGS to significantly improve the level of knowledge of CO2 storage potential and CO2-driven enhanced oil recovery (EOR) possibilities in conditions of Czech oilfields. The potentials for CO2-flooding of the oilfields will be evaluated based on primary screening criteria (sub-activity 3.1). Reservoir descriptions will be important input for this work, e.g. formation type, average depth, thickness, dip angle, heterogeneity, length, width, average permeability, average porosity. For the oil itself, composition, specific gravity and viscosity are required together with reservoir temperature and pressure to evaluate which recovery mechanisms can be important in the fields. The average remaining oil saturation is also required to estimate the recovery potential. This input data will be provided by CGS. Primary screening will identify fields with CO2-EOR potential. Oilfields that are found to have a potential for CO2-flooding based on the primary screening will be further evaluated by comparing them with oil fields where CO2-flooding has been reported to increase the recovery (sub-activity 3.2). Input provided by CGS to this evaluation will be reservoir description, oil composition and properties, and reservoir conditions. In sub-activity 3.3 the CO2 storage potential for the oilfields will be estimated based on reservoir description. Utilization of carbon dioxide as an EOR agent in increasing oil recovery from mature fields provides a unique opportunity to utilize these assets to store CO2 once the oil production diminishes and prior to abandoning the fields. This is a win-win situation where existing infrastructure will be used coupled with a, usually, sufficient amount of data required to evaluate, design and execute carbon storage projects. Following the two screening processes described under sub-activities 3.1 and 3.2, the CO2 storage potential for the oilfields will be estimated based on the existing reservoir description (type and distribution of formation porosity, macroscopic variation of formation properties in the form of reservoir heterogeneities, etc.).

4. Dissemination of results

Within sub-activity 4.1, an open workshop will be organised during the final period of the project in Prague with the aim to disseminate project results to broader R&D community, relevant industry representatives and policy / decision makers from the Czech Republic as well as neighbouring countries. In addition, paper and/or poster presentations based on project results will be prepared for at least 2 prestigious international conferences, like e.g. CCS Trondheim Conference (spring 2010) or EAGE / SPE EUROPEC Conference & Exhibition, Barcelona, June 2010 (sub-activity 4.2). Finally, two articles based on project results will be submitted to prestigious international scientific journals.