Geomechanical Analysis of the Influence of CO2 Injection

Assignment Task

Question 1

What is the transmissibity of a 50-m thick aquifer placed at 1.5 km depth if its intrinsic permeability is 10-13 m 2 .

Question 2

What is the thermal stress induced by cooling of 20 ºC in a rock with Young’s modulus of 10 GPa and Poisson ratio of 0.3. You may need to make assumptions on certain rock properties.

Question 3

What is the uniaxial vertical expansion of a 100-m thick reservoir that undergoes a pressure increase of 10 MPa. You may need to make assumptions on certain rock properties.

Question 4

You need to build a 2D numerical model of a tunnel excavation in a saturated rock with Young’s modulus of 10 GPa, Poisson ratio of 0.25, porosity 0.05 and permeability of 10- 18 m 2 . The model simulates the whole excavation process of the tunnel, which lasts for 2 years. The temperature remains constant during this period and equal to 40 ºC. What should be the dimension of the model in the section perpendicular to the tunnel axis to avoid having boundary effects on the calculated seepage?

Question 5

Explain, in no more than 200 words, how you would approach the problem of using ground surface measurement in response to deep fluid injection/production to characterize the subsurface, e.g., presence of faults. What methods you would use, e.g., analytical solutions, numerical simulations, machine learning; and what benefits and limitations have the methods that you propose.

Task Please, make a summary of the attached paper, including the main findings, a few words on the methods, the importance of the paper and your ideas on possible approaches for characterizing faults

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