1. A method of identifying a source rock candidate in a region of the Earth suspected to contain source rock and drilling, comprising the steps of: detecting, from beneath the surface of the Earth, a negative amplitude reflection of seismic energy followed by detecting a less negative amplitude reflection with increasing offset; detecting, from further beneath the surface of the Earth than the detected negative amplitude reflection, a positive amplitude reflection of seismic energy followed by detecting a weaker positive amplitude reflection with increasing offset; identifying a candidate source rock candidate via the detected negative and positive amplitude reflections; performing basin modelling based on seismic characteristics of the identified candidate source rock; and drilling a well on the basis of a basin model generated based on seismic characteristics of the identified candidate source rock.