Synergistic effects of asphaltite and graphene on cement resilience

A method comprising:

• providing a cement slurry by incorporating an asphaltite and graphene into a mixture comprising:
• a cement and water, whereby the cement slurry comprises from 0.2 to 20 percent graphene by weight of cement (% graphene bwoc) and from 0.2 to 20 percent asphaltite by weight of cement (% graphene bwoc);
• placing the cement slurry in a workspace;
• wherein the workspace comprises a wellbore penetrating a subterranean formation;
• allowing the cement slurry to set to provide a hardened cement;
• and
• thereby increasing a resiliency of the hardened cement by a synergistic interaction of the asphaltite and the graphene relative to a resiliency of a comparative hardened cement produced from an otherwise same cement slurry absent the asphaltite, the graphene or both, wherein the increased resiliency is determined as a reduction in a ratio of Young's modulus (YM) to compressive strength (CS) of the hardened cement relative to a ratio of YM to CS of the comparative hardened cement.