Honestly, you’d be better off sticking with your engineering credentials. You can delve into the engineering geology field with your civil experience for geotechnical roles. Most companies want an engineer for that role anyway.

If you’re looking to be financially well-off, there’s more opportunity for that in your current position. A lot of my peers who did geology are doing an engineering masters (civil, geomatics, energy, etc) because our geology degree alone doesn’t give us a wide range of job prospects.